检验医学 ›› 2020, Vol. 35 ›› Issue (10): 1036-1039.DOI: 10.3969/j.issn.1673-8640.2020.10.016

• 临床应用研究·论著 • 上一篇    下一篇

1个复合杂合突变导致的凝血因子Ⅺ缺陷症家系表型及基因型分析

毕晓洁1, 黄道超2, 金先富1, 姜俊宇1, 苏正仙1, 陈超超1, 沈波1()   

  1. 1.温州医科大学附属台州医院检验科,浙江 临海 317000
    2.温州医科大学附属台州医院急诊科,浙江 临海 317000
  • 收稿日期:2019-08-05 出版日期:2020-10-30 发布日期:2020-11-12
  • 作者简介:null

    作者简介:毕晓洁,女,1987年生,学士,主管技师,主要从事临床血液学检验工作。

Phenotype and genotype analysis of coagulation factor Ⅺ deficiency caused by a compound heterozygous mutation

BI Xiaojie1, HUANG Daochao2, JIN Xianfu1, JIANG Junyu1, SU Zhengxian1, CHEN Chaochao1, SHEN Bo1()   

  1. 1. Department of Clinical Laboratory,Taizhou Hospital,Wenzhou Medical University,Linhai 317000,Zhejiang,China
    2. Department of Emergency,Taizhou Hospital,Wenzhou Medical University,Linhai 317000,Zhejiang,China
  • Received:2019-08-05 Online:2020-10-30 Published:2020-11-12

摘要:

目的 研究1个遗传性凝血因子(F)Ⅺ缺陷症家系的表型和基因型,探讨其分子致病机制。方法 抽取先证者及家系(共3代8人)外周血,分离上层血浆,检测凝血相关指标;采用聚合酶链反应(PCR)扩增F11基因的13个外显子及5'端非翻译区,测序分析发现突变位点后采用反向测序验证。采用生物信息学软件(PolyPhen-2、Mutation Taster和SIFT)分析突变位点对蛋白质的影响。结果 先证者活化部分凝血活酶时间(APTT)为162 s,FⅪ活性(FⅪ:C)为2%,FⅪ抗原(FⅪ:Ag)为3.6%,其父亲、母亲、姐姐及儿子APTT均明显延长,FⅪ:C和FⅪ:Ag均明显下降。先证者F11基因存在cDNA.1640G>A和cDNA.2183G>A复合杂合突变,分别来自于父亲和母亲。生物信息学软件预测结果表明,该突变可影响蛋白质功能并导致相应疾病的发生。结论 F11基因存在cDNA.1640G>A和cDNA.2183G>A复合杂合突变,可能是导致患者FⅪ:C下降的原因。

关键词: 凝血因子Ⅺ缺陷症, 表型, 基因型, 分子机制

Abstract:

Objective To analyze the phenotype and genotype of a family with congenital coagulation factor(F) Ⅺ deficiency,and to investigate its molecular pathogenesis. Methods Peripheral blood samples of proband and family members(8 persons in 3 generations) were collected,and coagulation-related indicators in upper plasma were determined. Totally,13 exons and 5' non-translation regions of F11 were amplified by polymerase chain reaction(PCR),and sequencing analysis was performed. The corresponding mutation sites of family members were detected. The segment with mutation was sequenced backward. The effects of mutation sites on proteins were analyzed by bioinformatics softwares(PolyPhen-2,Mutation Taster and SIFT). Results The activated partial thromboplastin time(APTT) of proband was 162 s,FⅪ activity was 2%,and FⅪ antigen was 3.6%. His father,mother,sister and son all presented prolonged APTT with markedly decreased values of FⅪ activity and FⅪ antigen. Sequencing analysis showed cDNA.1640G>A and cDNA.2183G>A compound heterozygous mutations in F11 gene were from his father and mother,respectively. The results of bioinformatics softwares showed that the mutations could affect the function of protein and lead to the occurrence of corresponding diseases. Conclusions The compound heterozygous mutations of cDNA.1640G>A and cDNA.2183G>A in F11 gene may cause the decreased FⅪ activity in the patient.

Key words: Coagulation factor Ⅺ deficiency, Phenotype, Genotype, Molecular mechanism

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