Abstract
背景与目的p53基因与人类多种肿瘤相关,突变型具有致癌作用,主要分布在外显子5-8。本研究旨在建立高分辨熔解曲线(high resolution melting, HRM)检测非小细胞肺癌(non-small cell lung cancer, NSCLC)患者p53基因突变的方法,探讨p53基因突变的特点及其在NSCLC发生发展中的演变规律。方法采用HRM法检测264例NSCLC患者肿瘤组织和54例癌旁肺组织p53基因外显子5-8的突变,突变样品进一步使用PCR产物直接测序法分析确定突变类型;HRM法检测阳性而PCR产物直接测序法检测阴性的样品,进一步进行亚克隆测序证实。结果54例对照未发现突变。264例肿瘤组织中,HRM法检出p53基因突变104例,102例得到PCR产物直接测序法证实,突变率为39.4%;95例为点突变,7例为碱基插入和缺失导致的移码突变。p53外显子5-8的突变率分别为11.7%、8%、12.5%和10.6%,差异无统计学意义(P=0.35)。p53基因突变与性别有关,与其它临床病理特征无关。结论HRM法筛选p53基因突变样品,具有操作简便、快速、敏感、单管避免污染等优点,值得推广。p53基因的突变特点提示,p53基因突变是自发性突变,可能是DNA合成和修复过程中的随机错误所致。
Published Version
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