We report on the coinheritance of mild haemophilia A and type 1 von Willebrand disease (VWD) in a genetically characterized Italian family. The proband is a 56-year-old man carrying both the c.2167G>A mutation in the factor VIII (FVIII) gene (responsible for p.A723T substitution) and the c.4751A>G mutation (p.Y1584C) in the von Willebrand factor (VWF) gene.
Case: Proband (II-1), male, 56yo, Italian
DiseaseAssertion: VWD1 and Hemophilia A
FamilyInfo: Pedigree in Fig. 1 - Father had VWD1 and Mother had Hemophilia A - parents have normal or higher VWF levels, and normal FVIII/VWF:Ag ratios, as well as a normal bleeding score; 2 daughters carry F8 variant
ParentalGenotype(s): Paternal = NM_000552.4(VWF):c.4751A>G (p.Tyr1584Cys); Maternal = NM_000132.3(F8):c.2167G>A (p.Ala723Thr)
CasePresentingHPOs: HP:0012147, HP:0030129, HP:0030130, HP:0001892, HP:0000421, HP:0000978, HP:0004846, HP:0000225, HP:0005261, HP:0040242
(Reduced quantity of VWF, Impaired ristocetin cofactor assay activity, Impaired von Willebrand factor collagen binding activity, abnormal bleeding, epistaxis, Bruising susceptibility, Prolonged bleeding after surgery, bleeding gums, joint hemorrhage, muscle hemorrhage)
CaseHPOFreeText: blood group = 0, aPTT = 0.56sec, FVIII = 9.8 IU/dL, VWF:Ag = 43.2 IU/dL, VWF:CB = 35.6 IU/dL, VWF:Rco = 42.1 IU/dL, VWF:FVIIIB = 41.3 IU/dL, Platelet VWF:Ag = 58.2 IU/dL, bleeding score = 27
CaseNOTHPOs: HP:0011871
(Impaired RIPA)
CaseNOTHPOFreeText:
CasePreviousTesting:
GenotypingMethod: PCR and direct sequencing of VWF and FVIII
PreviouslyPublished: NA
Gene: VWF
Variant: c.4751A>G (p.Tyr1584Cys)
HGVS: NM_000552.4(VWF):c.4751A>G (p.Tyr1584Cys)
ClinVarID: 310; https://www.ncbi.nlm.nih.gov/clinvar/variation/310/
CAID: NA
gnomAD: MAF = 0.004024 (519/128972 alleles, 4 homozygotes) in European (non-Finnish) population
MultipleGeneVariants:
Gene: F8
Variant: c.2167G>A (p.Ala723Thr)
HGVS: NM_000132.3(F8):c.2167G>A (p.Ala723Thr)
ClinVarID: 10246; https://www.ncbi.nlm.nih.gov/clinvar/variation/10246/
CAid: NA
gnomAD: MAF = 0.00005257 (1/19022 alleles, 1 hemizygote) in South Asian population