13个STR位点在人消化系统肿瘤组织中的变异分析

目的探讨13个CODIS-STR基因座在人消化系统肿瘤组织中的变异情况。方法收集55个个体的消化系统肿瘤组织及其正常组织和血样,Chelex100法提取DNA,用Profiler试剂盒和Cofiler试剂盒进行复合扩增,310型遗传分析仪检测。结果55例肿瘤组织中均存在细胞分裂异常现象,其中有2例肿瘤组织的STR位点发生了变异,变异的类型包括基因型改变、杂合型丢失和杂合双峰不平衡,而且变异可以是多位点同时发生。结论对肿瘤组织类型的样品进行STR分析时,应多加慎重,因为排除的位点可能来自肿瘤组织中的基因突变。

Evaluation of allelic alterations in 13 CODIS STR loci in tumor tissues from human digestive system

Objective To study genetic alterations in 13 CODIS STR loci in various tumor tissue samples from human digestive system. Methods Malignant tumor tissues and blood samples taken from 55 different unrelated individuals were collected. DNA samples were extracted using Chelex100 extraction kit, amplified using Profiler and Cofiler PCR amplification kit and analyzed using API 310 analyzer. Results Aberrant cell divisions were detected in all of the 55 tumor tissue samples, with STR alternations detected in two samples including allelic alteration, partial and complete loss or unbalance of heterozygosity. Moreover, the alternations might occur simultaneously at more than one loci. Conclusion Caution must be taken in STR analysis of tumor tissue samples since the exclusion loci in forensic identification or paternity testing may be resulted from mutations in the tumor tissue.