Frequency of the p.Gly262Asp mutation in congenital Factor X deficiency. (2nd September 2015)

• Record Type: Journal Article
• Authors: Epcacan, Serdar; Menegatti, Marzia; Akbayram, Sinan; Cairo, Andrea; Peyvandi, Flora; Oner, Ahmet F.
• Is Part Of: European journal of clinical investigation. Volume 45:Number 10(2015:Oct.)
• Page Start: 1087
• Page End: 1091
• Publication Date: 2015-09-02
• Subjects: Pathology -- Periodicals; Medical research -- Periodicals; 616.075
• DOI: 10.1111/eci.12511
• Languages: English
• ISSNs: 0014-2972

Abstract

<abstract abstract-type="main" id="eci12511-abs-0001"> <title>Abstract</title> <sec id="eci12511-sec-0001" sec-type="section"> <title>Introduction</title> <p>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.</p> </sec> <sec id="eci12511-sec-0002" sec-type="section"> <title>Aim</title> <p>We analysed the clinical manifestations, laboratory phenotype and genotype in 12 patients from Turkey affected with severe FX deficiency.</p> </sec> <sec id="eci12511-sec-0003" sec-type="section"> <title>Methods</title> <p>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.</p> </sec> <sec id="eci12511-sec-0004" sec-type="section"> <title>Results</title> <p>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 (<italic>F10</italic>) 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.</p> </sec> <sec id="eci12511-sec-0005" sec-type="section"> <title>Conclusion</title> <p>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.</p> </sec> </abstract>