腹膜间皮瘤组织体细胞突变的分析

Detection of somatic mutations in deteriorated cell of peritoneal mesothelioma by whole genome sequencing

目的:探讨临床标本全基因组测序中体细胞突变测定技术的应用。方法:对1例手术切除的腹膜间皮瘤肿瘤组织和其癌旁组织进行了第二代全基因组测序,并将结果与人类基因组数据库的参考序列进行比对。结果:发现639 717个肿瘤组织和癌旁组织细胞共有的单核苷酸变异(single nucleotide variation,SNV),20 302个肿瘤组织独有的SNV和2 185个癌旁组织独有的SNV,还有223个位点,在肿瘤组织和癌旁组织以及人类基因组参考序列三者之间均不相同。结论:仅仅对个体2种组织样本和人类基因组参考序列比对,尚不能准确定位病变细胞的所有体细胞突变。因此,建立个体出生时的全基因组序列或预留出生时的DNA样本有助于排除正常组织体细胞突变的干扰。

Objective： To detect the somatic mutations in peritoneal mesothelioma with whole genome sequencing technique. Methods： Surgically reseeted cancer and pericancerous tissue samples from one patient with peritoneal mesothelioma were obtained. The whole genome sequences of tumor tissue and pericancerous tissue were examined by the second generation sequencing technique and compared with reference sequences from human genome database. Results： There were 639 717 single nucleotide variations （Single Nucleotide Variation SNV） found in both tumor and pericancerous tissue cells; while 20 302 SNVs were unique for tumor cells and 2 185 SNVs unique for pericancerous tissue, but still 223 SNVs found in cancer and pericancerous tissue were differed from those in human genome database. Conclusions： The preliminary results indicate that merely comparing the gene sequences of cancer and pericancerous tissue samples in an individual with the human genome reference sequence can not accurately locate all somatic mutations in pathological cells. For those individualized diseases caused by random somatic mutations,it is suggested to sequence the whole genome at birth or at least to reserve a DNA sample at early age for both research and clinical needs.