hMLH1 and hMSH2 gene mutations in a population susceptible to gastric cancer
- Author:
- No author available
- Journal Title:
- WORLD CHINESE JOURNAL OF DIGESTOLOGY
- Issue:
- 11
- DOI:
- 10.3969/j.issn.1009-3079.2010.11.008
- Key Word:
- 胃癌;家系;错配修复;基因突变
Abstract： 目的:分析中国北方地区胃癌家系人群及胃癌散发患者hMLH1和hMSH2基因的突变.方法:收集胃癌家族史的胃癌患者16例及5个家系健康人114例,无胃癌家族史的胃癌患者56例,正常人群对照100例.采取外周血,用小样本血液DNA提取试剂盒提取DNA.分别扩增hMLH1的外显子3、8、12、13和外显子16以及hMSH2的外显子5和外显子7,热变性后,用毛细管电泳进行单链构象多态性的分析,对可疑样本进行测序.结果:突变出现在hMLH1基因第8、第12和第16外显子,而外显子3和外显子13没有检测到突变,hMSH2基因的外显子5和外显子7也没有检测到突变.在有家族史的胃癌患者的16例外周血标本中,有6例出现突变,突变率37%;无胃癌家族史的56例患者,总计6例出现突变,突变率11%;胃癌家系健康人群的114例样本中,31例出现突变,突变率27%;在100例对照样本中,5例出现突变,突变率5%.第8外显子的突变点位于219位密码子的第一个碱基(ATC→GTC):第12外显子的突变点位于第384位密码子的第二个碱基(GTT→GAT);第16外显子的突变点位于第553位密码子的第二个碱基(AGT→AGG),这三个突变都是碱基置换.但有家族史的胃癌患者和胃癌家系健康成员的突变率明显高于对照组(P=0.001,0.000),无家族史的胃癌患者突变率虽然略高于对照组,但差异不显著(P=0.204).第16外显子的突变是目前尚未见报道的新的突变.结论:胃癌家系人群体细胞存在与遗传性非息肉性结肠癌(hereditary nonpolyposis colorectal cancer,HNPCC)相似的基因突变.
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