title: A novel gene insertion combined with a missense mutation causing factor VII deficiency in two unrelated Chinese families.
abstract: Hereditary coagulation factor VII (FVII) deficiency is a rare bleeding disorder characterized by reduced FVII activity (FVII:C) and inconsistent FVII antigen (FVII:Ag). In our study, two pregnant probands were diagnosed with FVII deficiency, based on the tests that FVII:C were both 3% and FVII:Ag were less than 7.5%. Gene sequencing revealed the same compound mutations, a recurrent missense mutation p.Arg277Cys and a novel insertion mutation g.11520-11521insT. What is more, haplotype analysis of SNPs excluded the possibility of consanguinity between the two families. According to the model, we speculated that although the insertion mutation was close to the carboxy-terminal, it induced the protein extension and affected the 3' untranslated region of F7 gene, which is significant to posttranscriptional regulation. Hypothetically, the stability or translational efficiency of mRNA may be influenced, resulting in reducing FVII:C.
authors.affiliation: Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou, China.
authors.forename: Xiuping
authors.initials: X
authors.lastname: Hao
authors.forename: XiaoLi
authors.initials: X
authors.lastname: Cheng
authors.forename: Yingyu
authors.initials: Y
authors.lastname: Wang
authors.forename: LiHong
authors.initials: L
authors.lastname: Yang
authors.forename: Yaosheng
authors.initials: Y
authors.lastname: Xie
authors.forename: Mingshan
authors.initials: M
authors.lastname: Wang
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Jin
mesh_terms: D000328:Adult; D044466:Asian People; D005168:Factor VII Deficiency / Q000235:genetics*; D005260:Female; D006801:Humans; D016254:Mutagenesis, Insertional / Q000235:genetics*; D020125:Mutation, Missense; D016133:Polymerase Chain Reaction / Q000379:methods*