MedGen

Combined deficiency of factor V and factor VIII (F5F8D1) is characterized by bleeding symptoms similar to those in hemophilia (306700) or parahemophilia (227400), caused by single deficiency of factor V (612309) or factor VIII (300840), respectively. The most common symptoms are epistaxis, menorrhagia, and excessive bleeding during or after trauma. Plasma FV and FVIII antigen and activity levels are in the range of 5 to 30%. Inheritance of F5F8D is autosomal recessive and distinct from the coinheritance of FV deficiency and FVIII deficiency (summary by Zhang and Ginsburg, 2004). Genetic Heterogeneity of Combined Deficiency of Factor V and Factor VIII Another form of combined deficiency of factor V and factor VIII (F5F8D2; 613625) is caused by mutation in the MCFD2 gene (607788) on chromosome 2p21. [from OMIM]

Combined deficiency of factor V and factor VIII type 2 (F5F8D2) is characterized by bleeding symptoms similar to those in hemophilia (306700) or parahemophilia (227400), caused by single deficiency of FV (612309) or FVIII (300841), respectively. The most common symptoms are epistaxis, menorrhagia, and excessive bleeding during or after trauma. Plasma FV and FVIII antigen and activity levels are in the range of 5 to 30%. Inheritance of F5F8D2 is autosomal recessive and distinct from the coinheritance of FV deficiency and FVIII deficiency (summary by Zhang and Ginsburg, 2004). For a general phenotypic description and a discussion of genetic heterogeneity of F5F8D, see 227300. [from OMIM]

Factor V deficiency is a rare autosomal recessive bleeding disorder with variable phenotypic expression (summary by van Wijk et al., 2001). [from OMIM]

Congenital disorder of glycosylation type IIw (CDG2W) is an autosomal dominant metabolic disorder characterized by liver dysfunction, coagulation deficiencies, and profound abnormalities in N-glycosylation of serum specific proteins. All reported patients carry the same mutation (602671.0017) (summary by Ng et al., 2021). For an overview of congenital disorders of glycosylation, see CDG1A (212065) and CDG2A (212066). [from OMIM]

Factor V Leiden thrombophilia is characterized by a poor anticoagulant response to activated protein C (APC) and an increased risk for venous thromboembolism (VTE). Deep vein thrombosis (DVT) is the most common VTE, with the legs being the most common site. Thrombosis in unusual locations is less common. Evidence suggests that heterozygosity for the Leiden variant has at most a modest effect on risk for recurrent thrombosis after initial treatment of a first VTE. It is unlikely that factor V Leiden thrombophilia (i.e., heterozygosity or homozygosity for the Leiden variant) is a major factor contributing to pregnancy loss and other adverse pregnancy outcomes (preeclampsia, fetal growth restriction, and placental abruption). The clinical expression of factor V Leiden thrombophilia is influenced by the following: The number of Leiden variants (heterozygotes have a slightly increased risk for venous thrombosis; homozygotes have a much greater thrombotic risk). Coexisting genetic thrombophilic disorders, which have a supra-additive effect on overall thrombotic risk. Acquired thrombophilic disorders: antiphospholipid antibody (APLA) syndrome, paroxysmal nocturnal hemoglobinuria, myeloproliferative disorders, and increased levels of clotting factors. Circumstantial risk factors including but not limited to pregnancy, central venous catheters, travel, combined oral contraceptive (COC) use and other combined contraceptives, oral hormone replacement therapy (HRT), selective estrogen receptor modulators (SERMs), obesity, leg injury, and advancing age. [from GeneReviews]