84 Matching Annotations
  1. Oct 2026
  2. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    First report on UK database of haemophilia B mutations and pedigrees. UK Haemophilia Centres
    2
    1. ClingenBaseline 25 Oct 2026
      mutations

      Case#: Saad_Probands 83-85 (assumed male; from UK)

      DiseaseAssertion: Saad_Proband 83: Severe Hemophilia B ; Saad_Probands 84-85: Moderate Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Proband 83: FIX:C: <1, Proband 84: FIX:C 1.6, Proband 85: FIX:C: 4)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 ParentalTest:Unknown DiseaseSeverity:Moderate DiseaseSeverity:Severe FIXTesting:Partial inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 21 Oct 2026
      mutations

      Case#: Saad_Probands 86-92 (assumed male; from UK)

      DiseaseAssertion: Saad_Probands 86-87: no disease assertion made ; Saad_Probands 88, 90, 91: Moderate Hemophilia B ; Saad_Probands 89, 92: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Proband_88 FIX:C:1 ; FIX:Ag:48, Proband_ 89 FIX:C: <1, Proband_90: FIX:C: 1 ; FIX:Ag:45, Proband_91: FIX:C: 2, Proband_92: FIX:C:<1)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 ParentalTest:Unknown DiseaseSeverity:Moderate DiseaseSeverity:Severe FIXTesting:Partial inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/8091381/
  3. illiad.lib.unc.edu illiad.lib.unc.edu
    Spectrum of F9 mutations in Chinese haemophilia B patients: identification of 20 novel mutations
    1
    1. ClingenBaseline 25 Oct 2026
      c.128G>A

      Case#: Variant #24 (no specific case; 5 patients and 5 families have variant)

      DiseaseAssertion: Severe (2), Moderate (1), Mild (2)

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: Absent/Not Reported

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 ParentalTest:Unknown Zygosity:NoZygosityAssertion FIXTesting:None DiseaseSeverity:Mild DiseaseSeverity:Moderate DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    illiad.lib.unc.edu/NOH/illiad.dll
  4. www.ncbi.nlm.nih.gov www.ncbi.nlm.nih.gov
    Compensated pathogenic variants in coagulation factors VIII and IX present complex mapping between molecular impact and hemophilia severity
    5
    1. ClingenBaseline 25 Oct 2026
      The final list of mutations is provided in Supplementary Table S1.

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: N/A

      CaseHPOsFreeText: N/A

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.110C>A (p.Ala37Asp)

      ClinVar: Absent

      CAID: CA414435430

      gnomAD: Absent/NotReported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435430 DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 24 Oct 2026
      The final list of mutations is provided in Supplementary Table S1.

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: N/A

      CaseHPOsFreeText: N/A

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.71T>C (p.Leu24Pro)

      ClinVar: Absent

      CAID: CA414434410

      gnomAD: Absent/NotReported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434410 DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 24 Oct 2026
      The final list of mutations is provided in Supplementary Table S1.

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: N/A

      CaseHPOsFreeText: N/A

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.59T>C (p.Leu20Ser)

      ClinVar: Absent

      CAID: CA414434363

      gnomAD: Absent/NotReported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434363 DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    4. ClingenBaseline 23 Oct 2026
      The final list of mutations is provided in Supplementary Table S1.

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: N/A

      CaseHPOsFreeText: N/A

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.68T>C (p.Leu23Pro)

      ClinVar: Absent

      CAID: CA414434403

      gnomAD: Absent/NotReported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434403 DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    5. ClingenBaseline 22 Oct 2026
      The final list of mutations is provided in Supplementary Table S1.

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: N/A

      CaseHPOsFreeText: N/A

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.112A>C (p.Asn38His)

      ClinVar: Absent

      CAID: CA414435439

      gnomAD: Absent/NotReported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435439 DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    ncbi.nlm.nih.gov/pmc/articles/PMC6606640/
  5. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Fast and efficient mutation detection method using multiplex PCR and cycle sequencing--application to haemophilia B
    2
    1. ClingenBaseline 25 Oct 2026
      mutation

      Case#: Cases 1464

      DiseaseAssertion: Familial Severe Hemophilia B

      FamilyInfo: In 16 cases, the family pedigree showed more than one affected individual (familial cases) and 12 cases were sporadic. In 17 cases, familial data was not available.

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 Zygosity:NoZygosityAssertion ParentalTest:Unknown FIXTesting:Partial DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 22 Oct 2026
      mutation

      Case#: Cases 1157, 1125, 1382, and 1434

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: In 16 cases, the family pedigree showed more than one affected individual (familial cases) and 12 cases were sporadic. In 17 cases, familial data was not available.

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Case 1157 FIX:C: <1; FIX:Ag: 38) (Case 1125 FIX:C: <1; FIX:Ag: n/a (Case 1382 FIX:C: <1; FIX:Ag: 1) Case 1434 FIX:C <1; FIX:Ag: n/a)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.6364C>T (p.Arg-4Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 ParentalTest:Unknown FIXTesting:Full DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/10739381/
  6. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Twenty-five novel mutations of the factor IX gene in haemophilia B
    1
    1. ClingenBaseline 25 Oct 2026
      Twenty-five novel mutations of the factor IX gene in haemophilia B

      Case#: Wulff_Proband_2252 and Wulff_Proband_2270

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>T (p.Arg43Leu)

      ClinVar: 993549

      CAID: CA414435545

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435545 FIXTesting:None ParentalTest:Unknown Zygosity:NoZygosityAssertion DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/8680410/
  7. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Factor IX gene analysis in 70 unrelated patients with haemophilia B: description of 13 new mutations
    1
    1. ClingenBaseline 25 Oct 2026
      mutation

      Case#: Attali_LY23 (assumed male, from France)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CasePresentingHPOsFreeText: reduced factor IX activity (FIX:C: <1 ; FIX:Ag: 44)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/10595634/
  8. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Molecular analysis of hemophilia B in Poland: 12 novel mutations of the factor IX gene
    1
    1. ClingenBaseline 25 Oct 2026
      mutations

      Case#: Wulff_Proband_031 & Wulff_Proband_048

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Proband_031: FIX:C: <1 FIX:Ag: 48 ; Proband_048 FIX:C <1 FIX:Ag: 52

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 ParentalTest:Unknown FIXTesting:Full DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/10698280/
  9. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Identification of mutations in the F9 gene including exon deletion by multiplex ligation-dependent probe amplification in 33 unrelated Korean patients with haemophilia B
    3
    1. ClingenBaseline 25 Oct 2026
      Leu-23Pro

      Case#: HB-KHF-04 (Male, Korean)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Among the 33 patients, 13 had a family history (39%), while the rest of the patients did not (sporadic, 61%). 27 patients (82%) had the severe form of the disease, while 6 patients (18%) had the moderate form

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0003645, HP:0011858

      CaseHPOsFreeText: Prolonged partial thromboplastin time, reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: aPTT and one-stage clotting assay at labs where patients were ascertained: FIX-deficient plasma (STA®-Deficient IX; Diagnostica Stago, Asnieres-sur-Seine, France; reference range, 60–150%) at Samsung Medical Center or HemosIL™ (Instrumentation Laboratory, Milan, Italy; reference range, 50–145%) at the Korea Hemophilia Foundation.

      Gene: F9

      Variant: NM_000133.4:c.68T>C (p.Leu23Pro)

      ClinVar: Absent

      CAID: CA414434403

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo DiseaseEntity:FactorIXDeficiency InheritancePattern:X-Linked Zygosity:NoZygosityAssertion FIXTesting:Partial CAID:CA414434403 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 22 Oct 2026
      (Leu24Pro)

      Case#: HB-KHF-04 (Male, Korean)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Among the 33 patients, 13 had a family history (39%), while the rest of the patients did not (sporadic, 61%). 27 patients (82%) had the severe form of the disease, while 6 patients (18%) had the moderate form

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0003645, HP:0011858

      CaseHPOsFreeText: Prolonged partial thromboplastin time, reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: aPTT and one-stage clotting assay at labs where patients were ascertained: FIX-deficient plasma (STA®-Deficient IX; Diagnostica Stago, Asnieres-sur-Seine, France; reference range, 60–150%) at Samsung Medical Center or HemosIL™ (Instrumentation Laboratory, Milan, Italy; reference range, 50–145%) at the Korea Hemophilia Foundation.

      Gene: F9

      Variant: NM_000133.4:c.71T>C (p.Leu24Pro)

      ClinVar: Absent

      CAID: CA414434410

      gnomAD: Absent/Not Reported

      Gene: F9 CaseInfo DiseaseEntity:FactorIXDeficiency InheritancePattern:X-Linked Zygosity:NoZygosityAssertion FIXTesting:Partial CAID:CA414434410 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 21 Oct 2026
      Arg-4Leu (Arg43Leu)

      Case#: HB-KHF-25 (Male, Korean)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Among the 33 patients, 13 had a family history (39%), while the rest of the patients did not (sporadic, 61%). 27 patients (82%) had the severe form of the disease, while 6 patients (18%) had the moderate form

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0003645, HP:0011858

      CaseHPOsFreeText: Prolonged partial thromboplastin time, reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: aPTT and one-stage clotting assay at labs where patients were ascertained: FIX-deficient plasma (STA®-Deficient IX; Diagnostica Stago, Asnieres-sur-Seine, France; reference range, 60–150%) at Samsung Medical Center or HemosIL™ (Instrumentation Laboratory, Milan, Italy; reference range, 50–145%) at the Korea Hemophilia Foundation.

      Gene: F9

      Variant: NM_000133.4:c.128G>T (p.Arg43Leu)

      ClinVar: 993549

      CAID: CA414435545

      gnomAD: Absent/Not Reported

      Gene: F9 CaseInfo DiseaseEntity:FactorIXDeficiency InheritancePattern:X-Linked Zygosity:NoZygosityAssertion FIXTesting:Partial CAID:CA414435545 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2008.01796.x
  10. link-springer-com.libproxy.lib.unc.edu link-springer-com.libproxy.lib.unc.edu
    Major bleeding in a patient with warfarin-hypersensitive and factor IX propeptide variant, p.Ala37Thr, who was treated with a direct oral anti-Xa inhibitor
    1
    1. ClingenBaseline 25 Oct 2026
      p.Ala37Thr

      Case#: Tamura_Case (male, 49 y/o)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: No family history of stroke, thrombosis or bleeding episodes

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0012233, HP:0011858

      CaseHPOsFreeText: cerebral infarction, prolonged APTT (58.4 s), elevated diluted Russell viper venom time ratio (2.68), and anti-β2 glycoprotein I antibody (9.7 U/mL) and anticardiolipin antibody IgG (39 U/mL), antiphospholipid antibody syndrome (APS), intramuscular hemorrhage, reduced factor IX activity (<0.5%)

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.109G>A (p.Ala37Thr)

      ClinVar: 804089

      CAID: CA10529736

      gnomAD: Allele Frequency in population where variant was found in the highest (South Asian population): 0.0001128

      Gene:F9 CaseInfo InheritancePattern:X-Linked Zygosity:NoZygosityAssertion CAID:CA10529736 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    link-springer-com.libproxy.lib.unc.edu/article/10.1007/s00277-018-3398-2
  11. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Molecular pathology of haemophilia B
    2
    1. ClingenBaseline 24 Oct 2026
      mutation

      Case#: Green_Malmo_6 (assumed male)

      DiseaseAssertion: Severe Hemophillia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C <1%, FIX:Ag: 26-34)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.6364C>T (p.Arg-4Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 22 Oct 2026
      mutation

      Case#: Green_London_3 & Green_London_4 (assumed male)

      DiseaseAssertion: Severe Hemophillia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (London 3: FIX:C:1, FIX:Ag: 48) (London 4: FIX:C:1, FIX:Ag: 45)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/2743975/
  12. link.springer.com link.springer.com
    Variants in FIX propeptide associated with vitamin K antagonist hypersensitivity: functional analysis and additional data confirming the common founder mutations
    3
    1. ClingenBaseline 24 Oct 2026
      Val37 mutation.

      Case#: Patient Q (male, 83 y/o, born in South Germany)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Brother died from a life threatening bleeding complication under phenprocoumon therapy

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858, HP:0012233

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: 2%), muscle hematoma of the extremities, subcutaneous bleed of the body and lower extremities.

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.110C>T (p.Ala37Val)

      ClinVar: Absent

      CAID: CA414435437

      gnomAD: Allele Frequency (European-non Finnish): 0.00002186

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435437 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 24 Oct 2026
      Thr37 mutation

      Case#: Pezeshkpoor_Patient_O (male, 36 y/o, from Switzerland)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0002625, HP:0011858

      CaseHPOsFreeText: deep vein thrombosis, low FIX:C levels (<1%), prolonged aPTT of 90 seconds, diffuse muscle bleeding

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.109G>A (p.Ala37Thr)

      ClinVar: 804089

      CAID: CA10529736

      gnomAD: Allele Frequency in population where variant was found in the highest (South Asian population): 0.0001128

      AdditionalCaseInfo: Sequencing of SERPINC1 revealed a splice site mutation located at c.1154-14G>A

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA10529736 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 22 Oct 2026
      Val37 mutation.

      Case#: Patient R (male, 83 y/o)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858, HP:0012233

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: 2.4%), extensive subcutaneous bleeding

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.110C>T (p.Ala37Val)

      ClinVar: Absent

      CAID: CA414435437

      gnomAD: Allele Frequency (European-non Finnish): 0.00002186

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435437 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    link.springer.com/article/10.1007/s00277-018-3264-2
  13. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Molecular characterization of haemophilia B patients in southern Brazil
    3
    1. ClingenBaseline 24 Oct 2026
      c.128G>A

      Case#: Meireles_Proband_2 (assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Trp)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene: F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 24 Oct 2026
      c.127C>T

      Case#: Meireles_Proband_4 (assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 22 Oct 2026
      c.128G>T

      Case#: Meireles_Proband_3 (assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.128G>T (p.Arg43Leu)

      ClinVar: 993549

      CAID: CA414435545

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Zygosity:NoZygosityAssertion Mutation:Missense CAID:CA414435545 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/hae.13277
  14. www.ncbi.nlm.nih.gov www.ncbi.nlm.nih.gov
    ajhg00092-0032.pdf
    1
    1. ClingenBaseline 24 Oct 2026
      HB55

      Case#: Family HB55

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>T (p.Arg43Leu)

      ClinVar: 993549

      CAID: CA414435545

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435545 Zygosity:NoZygosityAssertion ParentalTest:Unknown FIXTesting:Partial DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    ncbi.nlm.nih.gov/pmc/articles/PMC1683712/pdf/ajhg00092-0032.pdf
  15. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Germline mutations in the factor IX gene: a comparison of the pattern in Caucasians and non-Caucasians
    2
    1. ClingenBaseline 24 Oct 2026
      mutations in the factor IX gene resulting in hemophilia B

      Case#: Gostout_Proband_189 (assumed male, Asian (from India))

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: 3%)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.6364C>T (p.Arg-4Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 24 Oct 2026
      mutations in the factor IX gene resulting in hemophilia B.

      Case#: Gostout_Proband_280 (assumed male, Asian (from Japan))

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: 1.8%)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene: F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency CAID:CA414435539 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/8499919/
  16. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Identification of novel and recurrent mutations in Tunisian haemophilia B patients
    1
    1. ClingenBaseline 24 Oct 2026
      Hb15

      Case#: HB15 (assumed male, Tunisian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX: <1)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Zygosity:NoZygosityAssertion Mutation:Missense CAID:CA414435539 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2010.02442.x
  17. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Lithuanian haemophilia A and B registry comprising phenotypic and genotypic data
    1
    1. ClingenBaseline 24 Oct 2026
      6364 C→T

      Case#: Ivaskevicius_Proband_LT65 (assumed male, Lithuanian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: 0)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.6364C>T (p.Arg-4Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/full/10.1046/j.1365-2141.2001.02671.x
  18. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Heteroduplex screening for molecular defects in factor IX genes from haemophilia B families
    1
    1. ClingenBaseline 24 Oct 2026

      Case#: Patient A (assumed male)

      DiseaseAssertion: Severe (sporadic) Hemophilia B

      FamilyInfo: Variant also localized in affected brother, mother (Native American descent) is deceased but maternal grandmother and two maternal aunts screened negative, researchers believe this de novo mutation originated during either grandparent’s gametogenesis.

      ParentalTesting: Mother deceased, no mention of father

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: FIX Clotting Activity (U/dl): < 1, Antigen Level (U/dl): < 1

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.50T>A (p.Ile17Asn)

      LegacyVariant: c.79T>A (p.Ile-30Asn)

      ClinVar: Absent

      CAID: CA414434315

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434315 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/pdf/10.1111/j.1365-2141.1995.tb03319.x
  19. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    The human factor IX gene as germline mutagen test: Samples from mainland China have the putatively endogenous pattern of mutation
    4
    1. ClingenBaseline 24 Oct 2026

      Case#: Liu_Proband_56/439/440/486/830 (assumed male; Chinese)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: Absent

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 24 Oct 2026

      Case#: Liu_Proband_438 (assumed male; Chinese)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: Absent

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435537 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 23 Oct 2026

      Case#: Liu_Proband_316 (assumed male; Chinese)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.82T>G (p.Cys28Gly)

      ClinVar: Absent

      CAID: CA414434482

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434482 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    4. ClingenBaseline 22 Oct 2026

      Case#: Liu_Proband_322 (assumed male; Chinese)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.59T>C (p.Leu20Ser)

      ClinVar: Absent

      CAID: CA414434363

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434363 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/pdf/10.1002/1098-1004(200007)16:1<31::AID-HUMU6>3.0.CO
  20. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    The Arg-4 mutant factor IX Strasbourg 2 shows a delayed activation by factor XIa
    1
    1. ClingenBaseline 24 Oct 2026
      mutant factor IX

      Case#: Salle_Proband_J-C L (male, 23 y/o, white)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: family history is negative for any haemostatic disorder

      ParentalTesting: family history is negative for any haemostatic disorder

      CasePresentingHPOs: HP:0011858, HP:0012233, HP:0000421

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <0.01 % FIX:Ag: 0.46), muscular haematoma, haemarthrosis, nose bleeding

      CaseNotHPOs: N/A

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Zygosity:NoZygosityAssertion CAID:CA414435539 Mutation:Missense FIXTesting:Full DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/8295821/
  21. illiad.lib.unc.edu illiad.lib.unc.edu
    Secretion of wild&#x02010;type factor IX upon readthrough over <i>F9</i> pre&#x02010;peptide nonsense mutations causing hemophilia B
    1
    1. ClingenBaseline 24 Oct 2026
      p.Cys28Trp

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0001929

      CasePresentingHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.84T>G (p.Cys28Trp)

      ClinVar: Absent

      CAID: CA414434487

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414434487 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    illiad.lib.unc.edu/NOH/illiad.dll
  22. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Consequences of factor IX mutations in 26 families with haemophilia B
    1
    1. ClingenBaseline 24 Oct 2026
      Mutations

      Case#: Weinmann_Family 9248

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: 16 of the families were from the Pacific Northwest, 4 from Colorado, and 6 were referred from elsewhere in the United States

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1%, FIX:Ag: 37)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.6364C>T

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/full/10.1046/j.1365-2141.1998.00512.x
  23. haematologica.org haematologica.org
    Molecular genotyping of the Italian cohort of patients with hemophilia B
    7
    1. ClingenBaseline 24 Oct 2026
      identify the causative mutation

      Case#: Belvini_Proband_15 (male, Italian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 23 Oct 2026
      identify the causative mutation

      Case#: Belvini_Proband_13 (male, Italian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.110C>A (p.Ala37Asp)

      ClinVar: Absent

      CAID: CA414435430

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435430 ParentalTest:Unknown DiseaseSeverity:Severe FIXTesting:None inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 23 Oct 2026
      mutation

      Case#: Belvini_Proband_16 (Italian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant:NM_000133.4:c.135G>C (p.Lys45Asn)

      ClinVar: Absent

      CAID: CA414435574

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435574 ParentalTest:Unknown FIXTesting:None DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    4. ClingenBaseline 22 Oct 2026
      ion of a causative mutation

      Case#: HBF12 (North Indian origin)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: For each patient at least two first or second degree relatives were also analyzed. In every case the mother of the patient was analyzed to establish the presence of the mutation in the heterozygous state.

      ParentalTesting: Mother

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant:NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435537 ParentalTest:Mother DiseaseSeverity:Severe FIXTesting:None inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    5. ClingenBaseline 22 Oct 2026
      identify the causative mutation

      Case#: Belvini_Proband_7 (Italian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant:NM_000133.4:c.83G>A (p.Cys28Tyr)

      LegacyVariant: c.112G>A (p.Cys-19Tyr )

      ClinVar: Absent

      CAID: CA414434483

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434483 ParentalTest:Unknown DiseaseSeverity:Severe FIXTesting:None inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    6. ClingenBaseline 22 Oct 2026
      identify the causative mutation

      Case#: Belvini_Proband_4 (male, Italian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.59T>C (p.Leu20Ser)

      ClinVar: Absent

      CAID: CA414434363

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434363 ParentalTest:Unknown DiseaseSeverity:Severe FIXTesting:None inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    7. ClingenBaseline 21 Oct 2026
      identify the causative mutation

      Case#: Belvini_Proband_14 (male, Italian)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant:

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435537 ParentalTest:Unknown DiseaseSeverity:Severe FIXTesting:None inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    haematologica.org/article/view/3523
  24. www.ncbi.nlm.nih.gov www.ncbi.nlm.nih.gov
    ajhg00072-0168.pdf
    1
    1. ClingenBaseline 24 Oct 2026
      37, G-IA

      Case#: Riegelsberg (male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Mother carries only the G-to-A transition (age at conception: 30 y/o). Origin of variant cannot be proved, since maternal grandparents were deceased at time of report.

      ParentalTesting: Mother carries only the G-to-A transition, father shows to not be affected (figure 1)

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: FIX Coagulant %: < 1, FIX Antigen %: < 1

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.8G>A (p.Arg3His)

      LegacyVariant: c.37G>A

      ClinVar: 695909

      CAID: CA10529706

      gnomAD: Filtering AF: 0.0002304 (no homozygotes)

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA10529706 DiseaseSeverity:Severe ParentalTest:Both FIXTesting:Full inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    ncbi.nlm.nih.gov/pmc/articles/PMC1682539/pdf/ajhg00072-0168.pdf
  25. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Genetic basis and carrier detection of hemophilia B of Chinese origin
    1
    1. ClingenBaseline 23 Oct 2026
      genetic defects

      Case#: Taipei_1 & Taipei_2 (assumed male; Chinese)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Mothers of both families were found to be carriers as well as several other females in the family

      ParentalTesting: Mothers were carriers

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Patient 1: FIX:C: <1% FIX:Ag: 38 ; Patient 2: FIX:C: <1% ; FIX:Ag: 55)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 Zygosity:NoZygosityAssertion FIXTesting:Full ParentalTest:Mother DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/8470048/
  26. pdf.sciencedirectassets.com pdf.sciencedirectassets.com
    A recoded view on the F9 p.Cys178Ter pathogenic mechanism
    1
    1. ClingenBaseline 23 Oct 2026
      p.Cys28Gly

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Not provided

      ParentalTesting: Not provided

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.82T>G (p.Cys28Gly)

      ClinVar: Absent

      CAID: CA414434482

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414434482 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pdf.sciencedirectassets.com/271043/1-s2.0-S0049384820X00028/1-s2.0-S0049384820300256/main.pdf
  27. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Analysis of F9 point mutations and their correlation to severity of haemophilia B disease
    4
    1. ClingenBaseline 23 Oct 2026
      R46S

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0001929

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.138G>T (p.Arg46Ser)

      ClinVar: Absent

      CAID: CA414435596

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435594 Zygosity:NoZygosityAssertion ParentalTest:Unknown FIXTesting:None DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 23 Oct 2026
      K45N

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0001929

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.135G>T (p.Lys45Asn)

      ClinVar: Absent

      CAID: CA414435576

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435576 ParentalTest:Unknown FIXTesting:None DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 22 Oct 2026
      C28Y

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0001929

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.83G>A (p.Cys28Tyr)

      ClinVar: Absent

      CAID: CA414434483

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414434483 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    4. ClingenBaseline 21 Oct 2026
      I17N

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: None

      CasePresentingHPOs: HP:0001929

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.50T>A (p.Ile17Asn)

      ClinVar: Absent

      CAID: CA414434315

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414434315 ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2012.02848.x
  28. www-jbc-org.libproxy.lib.unc.edu www-jbc-org.libproxy.lib.unc.edu
    Factor IX San Dimas
    1
    1. ClingenBaseline 23 Oct 2026
      Factor IX San Dima

      Case#: Factor IX San Dimas Case

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:Ag 98%; FIX:C: <0.01)

      CaseNotHPOs: N/A

      CasePreviousTesting: DNA Seq analysis of the Factor IX gene (FIX:Ag 98%; FIX:C: <0.01)

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      LegacyVariant: p.Arg-4Gln

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    www-jbc-org.libproxy.lib.unc.edu/article/S0021-9258(18)60478-8/pdf
  29. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Comprehensive analysis of phenotypes and genetics in 21 Chinese families with haemophilia B: characterization of five novel mutations
    1
    1. ClingenBaseline 23 Oct 2026
      c.138G>C p.Arg46Ser

      Case#: Guo_Proband_5 (assumed male; Chinese)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity FIX:C: <1 %; FIX:Ag: 35)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.138G>C (p.Arg46Ser)

      ClinVar: Absent

      CAID: CA414435594

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe CAID:CA414435594 inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/pdf/10.1111/hae.12534
  30. pdf.sciencedirectassets.com pdf.sciencedirectassets.com
    PII: 0049-3848(92)90249-A
    3
    1. ClingenBaseline 23 Oct 2026
      (6372)

      Case#: Patient E (assumed male)

      DiseaseAssertion: Severe, Familial Hemophilia B

      FamilyInfo: Mothers were heterozygous, but patient E’s sister and aunt were non-carriers (homozygous for the cleavage)

      ParentalTesting: Mothers were heterozygous, but patient E’s sister and aunt were non-carriers (homozygous for the cleavage)

      CasePresentingHPOs: HP:0011858

      CasePresentingHPOsFreeText: reduced factor IX activity (FIX:C: <1; FIX:Ag:37/38)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.135G>T (p.Lys45Asn)

      ClinVar: Absent/Not Reported

      CAID: CA414435576

      gnomAD: Absent/Not Reported

      Gene: F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435576 ParentalTest:Unknown FIXTesting:Full DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 23 Oct 2026
      Arg- > Gln

      Case#: Patient D (assumed male)

      DiseaseAssertion: Severe, Sporadic Hemophilia B

      FamilyInfo: Patient D's mother is heterozygous and she has had a second, affected son. the maternal grandmother's DNA was also heterozygous

      ParentalTesting: Mother was heterozygous for the variant

      CasePresentingHPOs: HP:0011858

      CasePresentingHPOsFreeText: reduced factor IX activity (FIX:C: <1; FIX:Ag:41)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      LegacyVariant: c.6365 G>A (p.Arg-4Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Mother DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 22 Oct 2026
      Arg- > Gln

      Case#: Patient C (assumed male)

      DiseaseAssertion: Severe, Sporadic Hemophilia B

      FamilyInfo: Patient C's mother and two sisters were also heterozygous; and the third sister was homozygous for cleavage and is a non-carrier

      ParentalTesting: Mother was heterozygous for the variant

      CasePresentingHPOs: HP:0011858

      CasePresentingHPOsFreeText: reduced factor IX activity (FIX:C: <1; FIX:Ag:65)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      LegacyVariant: c.6365 G>A (p.Arg-4Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Mother DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pdf.sciencedirectassets.com/271043/1-s2.0-S0049384800X04367/1-s2.0-004938489290249A/main.pdf
  31. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Insight into molecular changes of the FIX protein in a series of Italian patients with haemophilia B
    3
    1. ClingenBaseline 23 Oct 2026

      Case#: IG2 (Italian, assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Not provided

      ParentalTesting: Not provided

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1%, FIX:Ag: 15-53)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 23 Oct 2026

      Case#: IG13 (Italian, assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Not provided

      ParentalTesting: Not provided

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1%)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.83G>A (p.Cys28Tyr)

      LegacyVariant: c.112G>A (p.Cys-19Tyr)

      ClinVar: Absent

      CAID: CA414434483

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414434483 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 21 Oct 2026

      Case#: IG38 (Italian, assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Not provided

      ParentalTesting: Not provided

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1%, FIX:Ag: 20)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.16364C>T (p.Arg-4Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2006.01275.x
  32. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Mutation Analysis in F9 Gene of 17 Families with Haemophilia B from Iran
    1
    1. ClingenBaseline 23 Oct 2026
      7

      Case#: Enayat_Family 7

      DiseaseAssertion: Severe Hemophilia B (Familial; from Shiraz, Iran)

      FamilyInfo: Affected mothers and some sisters were investigated as the "family"

      ParentalTesting:

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: < 0.01)

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      LegacyVariant: c.6365 G>A (p.Arg-4Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 ParentalTest:Mother FIXTesting:Partial DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2004.01041.x
  33. www.actabp.pl www.actabp.pl
    untitled
    1
    1. ClingenBaseline 23 Oct 2026

      Case#: 014 (AD); Polish origin

      DiseaseAssertion: Moderate Hemophilia B

      FamilyInfo: Not provided

      ParentalTesting: Not provided

      CasePresentingHPOs: HP:0011858

      CasePresentingHPOsFreeText: FIX:C : 2; FIX:Ag : 65

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.138G>T (p.Arg46Ser)

      ClinVar: Absent/Not Reported

      CAID: CA414435596

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense ParentalTest:Unknown FIXTesting:Full Zygosity:NoZygosityAssertion DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    actabp.pl/pdf/3_1999/721.pdf
  34. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    FIX mutation spectrum in haemophilia B patients from Jordan: identification of three novel mutations
    1
    1. ClingenBaseline 23 Oct 2026
      g.6365G>A

      Case#: Awidi_Variant_1 (9 patients, 2 families)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Positive family history

      ParentalTesting: Positive family history

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Zygosity:NoZygosityAssertion CAID:CA414435539 ParentalTest:Unknown Mutation:Missense DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2010.02365.x
  35. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Germline mutations in Peruvian patients with hemophilia B: pattern of mutation in AmerIndians is similar to the putative endogenous germline pattern
    3
    1. ClingenBaseline 23 Oct 2026
      mutation

      Case#: Heit_Proband_HB541 (assumed male, AmerIndian from Peru)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1 %)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 22 Oct 2026
      mutation

      Case#: Heit_Proband_HB541 (assumed male, AmerIndian from Peru)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1%

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.137G>C (p.Arg46Thr)

      LegacyVariant: c.6374 G>C (p.Arg-1Thr)

      ClinVar: Absent/Not Reported

      CAID: CA414435590

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Zygosity:NoZygosityAssertion CAID:CA414435590 ParentalTest:Unknown FIXTesting:Partial DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    3. ClingenBaseline 21 Oct 2026
      mutation

      Case#: Heit_Proband_HB535 (assumed male, AmerIndian from Peru)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1%)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      LegacyVariant: c.6364C>T (Arg-4Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/9600455/
  36. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    F8 and F9 mutations in US haemophilia patients: correlation with history of inhibitor and race/ethnicity
    1
    1. ClingenBaseline 23 Oct 2026
      Table S3. F9 mutations

      Case#: Miller_Proband 2 (male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 Zygosity:NoZygosityAssertion ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/10.1111/j.1365-2516.2011.02700.x
  37. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Characterization of genetic defects of hemophilia B of Chinese origin
    1
    1. ClingenBaseline 23 Oct 2026
      genetic defects

      Case#: Lin_Patient 3 (assumed male, Chinese origin)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C: <1 ; FIX:Ag: 38)

      CaseNotHPOs: N/A

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 Zygosity:NoZygosityAssertion ParentalTest:Unknown FIXTesting:Full DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/1796396/
  38. illiad.lib.unc.edu illiad.lib.unc.edu
    untitled
    1
    1. ClingenBaseline 23 Oct 2026
      2

      Case#: Quadros_Proband_ ID_#2

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.112A>C (p.Asn38His)

      ClinVar: Absent

      CAID: CA414435439

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435439 Zygosity:NoZygosityAssertion ParentalTest:Unknown FIXTesting:None DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    illiad.lib.unc.edu/NOH/illiad.dll
  39. www.proquest.com www.proquest.com
    Factor IX mutations in Haemophilia B patients in Malaysia: a preliminary study - ProQuest
    1
    1. ClingenBaseline 22 Oct 2026
      6365G>A (R-4Q)

      Case#: Balraj_Proband (from Malaysia)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      LegacyVariant: 6365 G>A (p.Arg-4Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Zygosity:NoZygosityAssertion Mutation:Missense CAID:CA414435539 ParentalTest:Unknown FIXTesting:None DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    proquest.com/docview/1030094611
  40. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Haemophilia B caused by a missense mutation in the prepeptide sequence of factor IX
    1
    1. ClingenBaseline 22 Oct 2026

      Case#: Patient UK22 (male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Mother is a carrier, two sisters (II:3, II:5) of patient UK22 were found to be carriers, niece of patient UK22 (III:4) is not a carrier

      ParentalTesting: Mother is a carrier, Father was unaffected (according to pedigree; figure 1)

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (<1% of factor IX; factor IX activity of 2 IU/dl), haemarthrosis of the knee, referred at 2 y/o,

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: Analysis of the essential regions of the gene; the promoter, exons, and regions containing the normal RNA processing signals only found this variant, and no other.

      Gene: F9

      Variant: NM_000133.4:c.50T>A (p.Ile17Asn)

      LegacyVariant: c.79T>A (p.Ile-30Asn)

      ClinVar: Absent

      CAID: CA414434315

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414434315 FIXTesting:Partial ParentalTest:Both DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/pdf/10.1002/humu.1380020207
  41. www-sciencedirect-com.libproxy.lib.unc.edu www-sciencedirect-com.libproxy.lib.unc.edu
    A recoded view on the F9 p.Cys178Ter pathogenic mechanism
    1
    1. ClingenBaseline 22 Oct 2026
      Table 1

      Case#: N/A

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0001929

      CaseHPOsFreeText: reduced factor IX activity

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.84T>G (p.Cys28Trp)

      ClinVar: Absent

      CAID: CA414434487

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414434487 FIXTesting:None ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    www-sciencedirect-com.libproxy.lib.unc.edu/science/article/pii/S0049384820300256
  42. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Molecular defects in haemophilia B: detection by direct restriction enzyme analysis
    1
    1. ClingenBaseline 22 Oct 2026
      mutations

      Case#: Chan_Hong Kong 2 & Chan_Hong Kong 3 (Southern Chinese, assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Carrier testing of at risk females in each family was completed by direct restriction enzyme analysis after determination of the specific FIX defect for the index patient

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Chan_Hong Kong 2 FIX:Ag: 0.93; FIX:C: 0.04) (Chan_Hong Kong 3 FIXAg: 0.82; FIX:C: 0.01)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      LegacyVariant: c.6365 G>A (p.Arg-4Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene: F9 CaseInfo Inherit DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/1680373/
  43. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Haplotype analysis of identical factor IX mutants using PCR
    1
    1. ClingenBaseline 22 Oct 2026
      mutations

      Case#: UK 130, Malmo 19, UK 134, Malmo 6, UK 129, Malmo 40, Malmo 20 (assumed male, from UK and Malmö, Sweden)

      DiseaseAssertion: UK 130: Moderate Hemophilia B Malmo 19: Moderate Hemophilia B UK 134: Severe Hemophilia B Malmo 6: Severe Hemophilia B UK 129: Moderate Hemophilia B Malmo 40: Moderate Hemophilia B Malmo 20: Moderate Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: reduced factor IX activity

      CaseHPOsFreeText: UK 130 FIX:C: 1.6 Malmo 19 FIX:C: 2.3 ; FIX:AG: 36 UK 134 FIX:C: <1 Malmo 6 FIX:C: <1 ; FIX:AG: 26-35 UK 129 FIX:C: 4 Malmo 40 FIX:C: 1 ; FIX:AG: 30 Malmo 20 FIX:C: 2 ; FIX:AG: 27

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435537 ParentalTest:Unknown FIXTesting:Full Zygosity:NoZygosityAssertion DiseaseSeverity:Moderate DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/1615486/
  44. onlinelibrary.wiley.com onlinelibrary.wiley.com
    Analysis of 18 novel mutations in the factor VIII gene
    1
    1. ClingenBaseline 21 Oct 2026
      IG1

      Case#: IG1, Italy

      DiseaseAssertion: Hemophilia A, severe (Table 1)

      FamilyInfo: Table 1 - female relative(s) tested

      ParentalTesting: No

      CasePresentingHPOs: HP:0003125

      (Reduced factor VIII activity)

      CaseHPOFreeText: FVIII:C <1%

      CaseNotHPOs: NA

      CaseNotHPOFreeText: NA

      CasePreviousTesting: Entire FVIII coding region, flanking splicing sites and promoter sequence were amplified. Mutational analyses included DHPLC followed by sequencing.

      Gene: F8

      Variant: NM_000132.3:c.98G>A p.(Trp33Ter)

      LegacyVariant: c.207G>A p.(Trp14Ter) [based on Antonarakis, 1998; PMID: 9450896]

      ClinVar: No

      CAID: CA414920533

      gnomAD: Not reported

      Gene:F8 CaseInfo InheritancePattern:Xlinked DiseaseEntity:FactorVIIIDeficiency Mutation:Nonsense Zygosity:NoZygosityAssertion CAID:CA414920533 FVIIItesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3546 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary.wiley.com/doi/full/10.1046/j.1365-2141.2003.04494.x
  45. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Missense mutations and evolutionary conservation of amino acids: evidence that many of the amino acids in factor IX function as "spacer" elements
    1
    1. ClingenBaseline 21 Oct 2026
      missense mutation

      Case#: Family HB90

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C:4 (post therapy values but clinically severe by criteria of Eyster et al. (1980)

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      AdditionalCaseInfo: Previously reported by Giannelli et al. (1990)

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/1680287/
  46. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Molecular pathology of haemophilia B: identification of five novel mutations including a LINE 1 insertion in Indian patients
    1
    1. ClingenBaseline 21 Oct 2026
      mutations

      Case#: B21 (assumed male, Indian origin)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: None

      ParentalTesting: N/A

      CasePresentingHPOs: reduced factor IX activity (FIX:C: 1.3%)

      CaseHPOsFreeText: HP:0011858

      CaseNotHPOs: N/A

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435537 ParentalTest:Unknown Zygosity:NoZygosityAssertion FIXTesting:Partial DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/15086324/
  47. www-sciencedirect-com.libproxy.lib.unc.edu www-sciencedirect-com.libproxy.lib.unc.edu
    Severe bleeding due to hypersensitivity to vitamin K antagonist caused by the c.109G>A (p.Ala37Thr) mutation in the F9 gene in a patient with mechanical heart valve prosthesis
    1
    1. ClingenBaseline 21 Oct 2026
      c.109G>A (p.Ala37Thr)

      Case#: Odnoczko_Case (male, 74 y/o, in Poland)

      DiseaseAssertion: Severe Hemophilia B (only in patients who receive vitamin K antagnoists (VKAs). The authors believe that during VKA therapy, the FIX activity is much lower than that of other vitamin K-dependent clotting factors for cases with this variant.

      FamilyInfo: Family history of bleeding diathesis was negative

      ParentalTesting:

      CasePresentingHPOs: HP:0012233, HP:0031364, HP:0001892

      CaseHPOsFreeText: left thigh & buttock hematoma, ecchymosis on extremeties with no mucosal bleeding, bleeding diathesis

      CasePreviousTesting: local labaratory blood tests revealed anemia (hemoglobin concentration 8 g/dl; ref. range 14–18 g/dl), prolongation of prothrombin time (PT) with International Normalized Ratio (INR) within the therapeutic range (between 2.0 and 3.0). The proband's activated partial thromboplastin time (APTT) was significantly (>2-folds) prolonged and FIX activity markedly decreased

      Gene: F9

      Variant: NM_000133.4:c.109G>A (p.Ala37Thr)

      ClinVar: 804089

      CAID: CA10529736

      gnomAD: Allele Frequency in population where variant was found in the highest (South Asian population): 0.0001128

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:Hemizygous CAID:CA10529736 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    www-sciencedirect-com.libproxy.lib.unc.edu/science/article/pii/S0049384818306443
  48. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Spectrum of F9 mutations in Chinese haemophilia B patients: identification of 20 novel mutations
    1
    1. ClingenBaseline 21 Oct 2026
      mutation

      Case#: Mutation found in 4 patients, and in 4 families

      DiseaseAssertion: Severe in 2 cases, moderate in the other 2 cases

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858, HP:0003645, HP:0001892

      CaseHPOsFreeText: reduced factor IX activity, activated partial thromboplastin time (APTT), normal FVIII clotting activity and bleeding tendency

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435537 ParentalTest:Unknown FIXTesting:None DiseaseSeverity:Moderate DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/22544209/
  49. onlinelibrary-wiley-com.libproxy.lib.unc.edu onlinelibrary-wiley-com.libproxy.lib.unc.edu
    Identification of twenty‐one new mutations in the factor IX gene by SSCP analysis
    2
    1. ClingenBaseline 21 Oct 2026

      Case#: Patient 63 (Spanish origin; assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Not available

      ParentalTesting: Not available

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: FIX:C = 3 (reduced factor IX activity)

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435539 Zygosity:NoZygosityAssertion FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
    2. ClingenBaseline 21 Oct 2026

      Case#: Patient 72 (Spanish origin; assumed male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: Not available

      ParentalTesting: Not available

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: FIX:C = <1 (reduced factor IX activity)

      CaseNotHPOs: N/A

      CaseNotHPOFreeText: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense CAID:CA414435537 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    onlinelibrary-wiley-com.libproxy.lib.unc.edu/doi/pdf/10.1002/(SICI)1098-1004(1999)13:2<160::AID-HUMU9>3.0.CO
  50. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Molecular characterization of factor IX gene mutations in 53 patients with haemophilia B in India
    1
    1. ClingenBaseline 21 Oct 2026
      mutation

      Case#: HB-125 (assumed male, India)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (FIX:C <1%)

      CaseNotHPOs: None

      CasePreviousTesting: None

      Gene: F9

      Variant: NM_000133.4:c.128G>A (p.Arg43Gln)

      ClinVar: 810864

      CAID: CA414435539

      gnomAD: Absent/Not Reported

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435539 ParentalTest:Unknown FIXTesting:Partial DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/16270648/
  51. www-ncbi-nlm-nih-gov.libproxy.lib.unc.edu www-ncbi-nlm-nih-gov.libproxy.lib.unc.edu
    Factor IX p.A37V mutation causes severe bleeding in a patient with phenprocoumon therapy
    1
    1. ClingenBaseline 21 Oct 2026
      c.110C > T p (Ala37Val).

      Case#: Mülling_Proband_1 (55 y/o, male)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: N/A

      CasePresentingHPOs: HP:0011858, HP:0100584, HP:0002094

      CaseHPOsFreeText: Reduced factor IX activity (FIX activity: 3%), infective endocarditis, dyspnea

      CaseNotHPOs: N/A

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.110C>T (p.Ala37Val)

      ClinVar: Absent

      CAID: CA414435437

      gnomAD: 0.00002186 in European (non-Finnish) population (highest frequency of variant found in this population)

      AdditionalCaseInfo: Patient developed severe bleeding under therapy with phenprocoumon, aPTT was prolonged, while factor IX activity was significantly reduced. Acquired hemophilia was excluded, due to missing detection of inhibitors

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion CAID:CA414435437 FIXTesting:Partial ParentalTest:Unknown DiseaseSeverity:Severe inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    www-ncbi-nlm-nih-gov.libproxy.lib.unc.edu/pmc/articles/PMC8243751/
  52. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov
    Twenty-Four Novel Hemophilia B Mutations Revealed by Rapid Scanning of the Whole Factor IX Gene in a French Population Sample
    1
    1. ClingenBaseline 21 Oct 2026
      mutations

      Case#: Ghanem_Paris 2 (assumed male, from Paris) & Ghanem_ Caen 2 (assumed male, from Caen)

      DiseaseAssertion: Severe Hemophilia B

      FamilyInfo: N/A

      ParentalTesting: None

      CasePresentingHPOs: HP:0011858

      CaseHPOsFreeText: reduced factor IX activity (Paris 2: FIX:C: <1, FIX:Ag: 28, Caen 2: FIX:C: <1

      CaseNotHPOs: None

      CasePreviousTesting: N/A

      Gene: F9

      Variant: NM_000133.4:c.127C>T (p.Arg43Trp)

      ClinVar: 811505

      CAID: CA414435537

      gnomAD: Highest AF (South Asian population): 0.0004904

      Gene:F9 CaseInfo InheritancePattern:X-Linked DiseaseEntity:FactorIXDeficiency Mutation:Missense Zygosity:NoZygosityAssertion FIXTesting:Full ParentalTest:Unknown DiseaseSeverity:Severe CAID:CA414435537 inferred_gene_hgnc:3551 inferred_gene_source:CAID ClinGen Coag Fac Def VCEP
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    pubmed.ncbi.nlm.nih.gov/8055323/