人原发性肝癌中p16基因缺失突变研究

目的　探讨 p16基因缺失和突变在人原发性肝癌分子发病机理中所起的作用。方法　采用多重PCR和 PCR- SSCP对 31例人原发性肝癌、31例癌旁肝硬化组织以及 8例正常人白细胞中 p16基因第一 ,二外显子和部分第一 ,二内含子缺失和突变进行了研究。结果　在 31例人原发性肝癌中发现 4例 p16基因第一外显子和部分第一内含子区域缺失 ,缺失率为 13% ,第二外显子和部分第二内含子区域未见缺失 ;SSCP分析发现在肝癌和癌旁肝硬化组织中 p16基因第一内含子及其下游第二外显子 18bp区域存在三种单链构象 ,第一外显子、大部分第二外显子以及部分第二内含子未见异常的 SSCP区带 ,而在正常人白细胞中有两种单链构象。结论　在人原发性肝癌中 p16基因缺失频率较低 ,罕见突变

Study of Deletion and Mutation of p16 Gene in Primary Hepatocellular Carcinoma

Objective To investgate the role the deletion and mutation of p16 gene plays in the pathogenesis of human primary hepatocarcinoma. Methods Thirty one cases of human hepatocarcinoma, 31 cases of adjacent noncancerous liver cirrhosis and the leukocytes of 8 normal human subjects were analyzed for deletion and mutation in p16 gene exons 1, 2 and introns 1, 2 with comparative multipe PCR and PCR SSCP. Results Deletion of p16 gene exon 1 and partial intron 1 was found in 4 of 31 cases (13/%). No deletion of exon 2 or intron 2 was found. Three patterns of p16 gene intron 1 and 18bp flanking sequence in exon 2 at SSCP analysis were observed in hepatocellular carcinoma and corresponding adjacent noncancerous cirrhosis, and two patterns were found in human normal leukocyte DNA. No aberrant single strand at SSCP in p16 gene exon 1 or most part of exon 2 or intron 2 was detected . Conclusion Low frequency of deletion and rare mutation of p16 suppressor gene occured in hepatocellular carcinoma.