PatientID: II.1

KindredID: F1

Case: M, 15Y0M, Ethnicity Unknown

DiseaseAssertion: Polycythemia

FamilyInfo: N/A

CasePresentingHPOs: HP:0001901 (Polycythemia)

CaseHPOFreeText: Diagnosed with erythrocytosis (Polycythemia) and kidney ischemic infarct at age 15 (DOB: 1991).

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: c.340+770T>C

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 816685, https://www.ncbi.nlm.nih.gov/clinvar/variation/816685/

CAID: N/A

gnomAD: N/A

VariantEvidence: Variants are heterozygous.

MutationType: missense_variant;transition; splice_site_variant

CivicName: D143= (c.429C>T) and c.340+770T>C

MultipleGeneVariants: Germline, VHL, c.429C>T (p.Asp143Asp)

PatientID: I.2

KindredID: F10

Case: F, Age Unknown, Ethnicity Unknown

DiseaseAssertion: Asymptomatic

FamilyInfo: This patient’s partner and two children were all carriers of the D143= (c.429C>T) germline VHL variant. Their son was diagnosed with splenomegaly and polycythemia and was homozygous for the variant. All other family members were asymptomatic.

CasePresentingHPOs: N/A

CaseHPOFreeText: N/A

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.D143= (c.429C>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 416990, https://www.ncbi.nlm.nih.gov/clinvar/variation/416990/

CAID: N/A

gnomAD: 0.000007953, https://gnomad.broadinstitute.org/variant/3-10188286-C-T?dataset=gnomad_r2_1

VariantEvidence: N/A

MutationType: missense_variant;transition; synonymous_variant

CivicName: D143= (c.429C>T)

MultipleGeneVariants: N/A

PatientID: I.1

KindredID: F10

Case: M, Age Unknown, Ethnicity Unknown

DiseaseAssertion: Asymptomatic

FamilyInfo: This patient’s partner and two children were all carriers of the D143= (c.429C>T) germline VHL variant. Their son was diagnosed with splenomegaly and polycythemia and was homozygous for the variant. All other family members were asymptomatic.

CasePresentingHPOs: N/A

CaseHPOFreeText: N/A

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.D143= (c.429C>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 416990, https://www.ncbi.nlm.nih.gov/clinvar/variation/416990/

CAID: N/A

gnomAD: 0.000007953, https://gnomad.broadinstitute.org/variant/3-10188286-C-T?dataset=gnomad_r2_1

VariantEvidence: N/A

MutationType: missense_variant;transition; synonymous_variant

CivicName: D143= (c.429C>T)

MultipleGeneVariants: N/A

PatientID: II.1

KindredID: F10

Case: M, 4Y6M, Ethnicity Unknown

DiseaseAssertion: Polycythemia

FamilyInfo: This patient’s asymptomatic patients were both found to be carriers of the D143= (c.429C>T) germline variant in VHL. Their other child (II.2) also carried the gene. The current patient was the only one who was homozygous for the variant.

CasePresentingHPOs: HP:0001901; HP:0001744 (Polycythemia, Splenomegaly)

CaseHPOFreeText: Diagnosed with erythrocytosis (Polycythemia) and splenomegaly at 4.5 years old (DOB: 2002).

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.D143= (c.429C>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 416990, https://www.ncbi.nlm.nih.gov/clinvar/variation/416990/

CAID: N/A

gnomAD: 0.000007953, https://gnomad.broadinstitute.org/variant/3-10188286-C-T?dataset=gnomad_r2_1

VariantEvidence: Variant is present in allele 1 and 2 (i.e. homozygous).

MutationType: missense_variant;transition; synonymous_variant

CivicName: D143= (c.429C>T)

MultipleGeneVariants: Germline, Beta Thalassemia