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

PatientID: II.1

KindredID: F4

Case: M, 7Y0M, Ethnicity Unknown

DiseaseAssertion: Polycythemia

FamilyInfo: Variant c.340+694_340+711dup is inherited from mother (genetically confirmed) and variant R200W (c.598C>T) is assumed to be inherited from father.

CohortInfo: Patients with Chuvash polycythemia for whom VHL R200W had been found in a heterozygous state.

CasePresentingHPOs: HP:0001901; HP:0002625; HP:0001342 (Polycythemia, Deep venous thrombosis, Cerebral hemorrhage)

CaseHPOFreeText: Diagnosed with erythrocytosis (Polycythemia), deep vein thrombosis, intracerebral hemorrhage at age 7 (DOB: 1990).

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.R200W (c.598C>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 2232, https://www.ncbi.nlm.nih.gov/clinvar/variation/2232/

CAID: N/A

gnomAD: 0.0002016, https://gnomad.broadinstitute.org/variant/3-10191605-C-T

VariantEvidence: Variants are heterozygous.

MutationType: missense_variant;transition

CivicName: R200W (c.598C>T) and c.340+694_340+711dup

MultipleGeneVariants: Germline, VHL, c.340+694_340+711dup

MultipleGeneVariants: Germline, Factor V Leiden

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

PatientID: II.1

KindredID: F4

Case: M, 7Y0M, Ethnicity Unknown

DiseaseAssertion: Polycythemia

FamilyInfo: Variant c.340+694_340+711dup is inherited from mother (genetically confirmed) and variant R200W (c.598C>T) is assumed to be inherited from father.

CohortInfo: Patients with Chuvash polycythemia for whom VHL R200W had been found in a heterozygous state.

CasePresentingHPOs: HP:0001901; HP:0002625; HP:0001342 (Polycythemia, Deep venous thrombosis, Cerebral hemorrhage)

CaseHPOFreeText: Diagnosed with erythrocytosis (Polycythemia), deep vein thrombosis, intracerebral hemorrhage at age 7 (DOB: 1990).

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.R200W (c.598C>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 2232, https://www.ncbi.nlm.nih.gov/clinvar/variation/2232/

CAID: N/A

gnomAD: 0.0002016, https://gnomad.broadinstitute.org/variant/3-10191605-C-T

VariantEvidence: Variants are heterozygous.

MutationType: missense_variant;transition

CivicName: R200W (c.598C>T) and c.340+694_340+711dup

MultipleGeneVariants: Germline, VHL, c.340+694_340+711dup

MultipleGeneVariants: Germline, Factor V Leiden

PatientID: 2

KindredID: 1

Case: M, 10Y0M, Ukrainian

DiseaseAssertion: Asymptomatic

FamilyInfo: His sister (patient 1) also had polycythemia and was heterozygeous for the mutation. Mutation inherited from father. The father was not polycythemic, but his BFU-Es were hypersensitive to Epo.

CasePresentingHPOs: HP:0001901 (polycythemia)

CaseHPOFreeText: Patient had a hematocrit of 63%, erythropoietin level of 271 mIU/mL, and had hypersensitivity of erythroid progenitors to Epo.

CaseNotHPOs: N/A

CaseNotHPOFreeText: No tumor masses were detected by repeated CT scans of his abdomen or chest and by magnetic resonance imaging (MRI) of the head.

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.D126Y(c.376G>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 2230 https://www.ncbi.nlm.nih.gov/clinvar/variation/2230/

CAID: CA020319 http://reg.clinicalgenome.org/redmine/projects/registry/genboree_registry/allele?hgvsOrDescriptor=NM_000551.3%3Ac.376G%3ET

gnomAD: N/A

VariantEvidence: Patient was heterozygous for the mutation.

MutationType: missense_variant;transversion

CivicName: D126Y(c.376G>T)

MultipleGeneVariants: N/A

PatientID: 2

KindredID: 1

Case: M, 10Y0M, Ukrainian

DiseaseAssertion: Asymptomatic

FamilyInfo: His sister (patient 1) also had polycythemia and was heterozygeous for the mutation. Mutation inherited from father. The father was not polycythemic, but his BFU-Es were hypersensitive to Epo.

CasePresentingHPOs: HP:0001901 (polycythemia)

CaseHPOFreeText: Patient had a hematocrit of 63%, erythropoietin level of 271 mIU/mL, and had hypersensitivity of erythroid progenitors to Epo.

CaseNotHPOs: N/A

CaseNotHPOFreeText: No tumor masses were detected by repeated CT scans of his abdomen or chest and by magnetic resonance imaging (MRI) of the head.

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.D126Y(c.376G>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 2230 https://www.ncbi.nlm.nih.gov/clinvar/variation/2230/

CAID: CA020319 http://reg.clinicalgenome.org/redmine/projects/registry/genboree_registry/allele?hgvsOrDescriptor=NM_000551.3%3Ac.376G%3ET

gnomAD: N/A

VariantEvidence: Patient was heterozygous for the mutation.

MutationType: missense_variant;transversion

CivicName: D126Y(c.376G>T)

MultipleGeneVariants: N/A