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  1. Oct 2026
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    Expanding the Mutation Spectrum Affecting &#x003B1;IIb&#x003B2;3 Integrin in Glanzmann Thrombasthenia: Screening of the <i>ITGA2B</i> and <i>ITGB3</i> Genes in a Large International Cohort
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    1. ClingenBaseline 25 Oct 2026

      Supplementary Table S1 & S2 Proband and Variant Information:

      Case18: GT21, Female, 61, French

      DiseaseAssertion: Glanzmann thrombasthenia

      FamilyInfo: N/A

      ParentalGenotype: N/A

      CasePresentingHPOs: HP:0000421, HP:0002239

      (Epistaxis, GI bleeding)

      CaseHPOFreeText: N/A

      CaseNotHPOs: N/A

      CaseNotHPOsFreeText: N/A

      ProteinExpression: Flow cytometry showed <5% expression of αIIbβ3 (See Supplementary Table 1)

      PlateletAggregation: Absent platelet aggregation (See Supplementary Table 1)

      CasePreviousTesting: Sanger sequencing of ITGA2B and ITGB3

      Gene: ITGA2B

      Variant: NM_000419.3:c.1440-13_1440-1del (p.Arg480Serfs*106) and NM_000419.3:c.2864T>A (p.Leu955Gln)

      LegacyVariant: N/A

      ClinVar: N/A

      CAiD: CA913184940 and CA399791171

      gnomAD: N/A

      CaseInfo Individual Gene:ITGA2B InheritancePattern:NoInheritanceAssertion DiseaseEntity:GlanzmannThrombasthenia Mutation:Missense Mutation:Intronic Zygosity:CompoundHeterozygous CAiD:CA915940226 CAiD:CA399791171 PreviousTesting:Full ProteinExpression:Reported PlateletAggregation:MinimalInformation SupplementalData inferred_gene_hgnc:6156 inferred_gene_source:CAID ClinGen ITGA2B/ITGB3

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    REV_ISS_WEB_BJH_14283_175-4 686..695
    1
    1. ClingenBaseline 22 Oct 2026

      Supplementary Table S1:

      Case18: GT21, French, gender and age are not specified

      DiseaseAssertion: Glanzmann thrombasthenia type I

      FamilyInfo: N/A

      ParentalGenotype: N/A

      CasePresentingHPOs: N/A

      CaseHPOFreeText: All patients had a life-long history of mucocutaneous bleeding

      CaseNotHPOs: N/A

      CaseNotHPOsFreeText: N/A

      ProteinExpression: All patients in this study met the clinical and platelet function requirements for GT-- this includes an absent or strongly reduced expression of alphaIIbBeta3 in platelets

      PlateletAggregation: All patients in this study met the clinical and platelet function requirements for GT-- this includes absent or severely reduced platelet aggregation with at least three physiological agonists

      CasePreviousTesting: Sanger sequencing was performed. Sanger sequencing ensured coverage of all exons and splice sties of the ITGA2B and ITGB3 genes and extended 300-500 bp into the introns as well as including the UTR. They sequenced 416 bp upstream of the ITGA2B promoter and 463 bp upstream of the ITGB3 promoter. In total they sequenced 51.2% of the ITGA2B gene and 19.4% of the larger ITGB3 gene

      Gene: ITGA2B

      Variant: NM_000419.3:c.1440-13_1440-1del (p.Arg480Serfs106) and NM_000419.3:c.2864T>A

      LegacyVariant: N/A

      ClinVar: N/A

      CAiD: CA913184940 and CA399791171

      gnomAD: N/A

      CaseInfo Individual Gene:ITGA2B InheritancePattern:NoInheritanceAssertion DiseaseEntity:GlanzmannThrombasthenia Mutation:Large Mutation:Missense Zygosity:CompoundHeterozygous CAiD:CA913184940 CAiD:CA399791171 PreviousTesting:Full ProteinExpression:MinimalInformation PlateletAggregation:MinimalInformation SupplementalData inferred_gene_hgnc:6138 inferred_gene_source:CAID ClinGen ITGA2B/ITGB3

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