Frequency of the p.Gly262Asp mutation in congenital Factor X deficiency.

Congenital factor X (FX) deficiency is a rare bleeding disorder inherited as an autosomal recessive trait with an incidence of 1 : 500 000-1 000 000. A total or partial deficiency of FX causes an impairment of clot formation, leading to a haemorrhagic disease, which manifests with bleeding symptoms of different severity, also unprovoked. We analysed the clinical manifestations, laboratory phenotype and genotype in 12 patients from Turkey affected with severe FX deficiency. Prothrombin time (PT), activated partial thromboplastin time (APTT), FX activity (FX:C) and FX antigen level (FX:Ag) were measured, and mutation analysis was performed for all patients. The most frequent bleeding episodes in patients were epistaxis and easy bruising (11/12, 91%), followed by haemarthroses (10/12, 83%). FX:C was <1% in 11 patients, and 4% in one. FX:Ag was reduced in all patients, consistent with type II deficiency. Direct sequencing of the factor X gene (F10) identified two different mutations: the novel 33 bp in-frame deletion p.Thr176_Gln186, c.526_558del, which seems to be associated with milder bleeding symptoms and the c.785G>A, p.Gly262Asp missense mutation (previously reported as Gly222Asp), which is associated with severe bleeding symptoms. The p.Gly262Asp missense mutation was identified in 11 of the 12 patients in this study. Previously published cases on the same p.Gly262Asp mutation were Iranian patients originating from the border between Turkey and Iran suggesting that this mutation may be candidate as a good tool for mutational screening analysis in this area.

Epcacan S ，Menegatti M ，Akbayram S ，Cairo A ，Peyvandi F ，Oner AF ... -  《-》

Diagnosis and treatment of inherited factor X deficiency.

Brown DL ，Kouides PA 《-》

Factor X deficiency: clinical manifestation of 102 subjects from Europe and Latin America with mutations in the factor 10 gene.

Herrmann FH ，Auerswald G ，Ruiz-Saez A ，Navarrete M ，Pollmann H ，Lopaciuk S ，Batorova A ，Wulff K ，Greifswald Factor X Deficiency Study Group ... -  《-》

[Phenotype and genotype analysis for a consanguineous pedigree with combined coagulation factor VII and X deficiency].

Jin Y ，Wang M ，Wang Y ，Yang X ，Yang L ，Xie Y ，Xie H ，Zhu L ，Yu F ... -  《-》

[Homozygous missense mutation p.Val298Met of F10 gene causing hereditary coagulation factor X deficiency in a Chinese pedigree].

Jin Y ，Hao X ，Cheng X ，Yang L ，Chen Y ，Xie H ，Wang Y ，Wang M ... -  《-》