Lancet Oncol:插入和缺失突变驱动的肿瘤特异性抗原以及其免疫特征

2017-07-10 zhangfan MedSci原创

研究发现,在所有肿瘤种类中,肾细胞癌插入和缺失突变的比例和数量最多,插入和缺失突变是高度免疫原性突变类型,可引发抗原丰度以及突变特异性结合增加

目前肿瘤特异性抗原分析的重点是单核苷酸变异(SNVs),对于插入和缺失(INDELS)的研究较少。近日研究人员对于这种自我创造出新的开放阅读框架和大量的突变氨基酸序列的INDEL移码突变的性质开展研究以确定其在肿瘤免疫中的作用。

研究人员对19个肿瘤类型的5777个实体瘤样本进行全基因组测序分析,比较队列中插入和缺失突变的比例和数量,分析了肿瘤特异性抗原与泛癌突变型并对392例肾透明细胞癌患者进行RNA转录组测序技术以比较患者间免疫基因表达差异。研究人员测定了4种免疫检查点抑制剂对INDEL突变的治疗效果。

泛癌突变研究发现,肾细胞癌患者具有最高的突变比例(0.12)以及突变数量(p<2·2×10-16),大约是其余癌症类型INDEL突变比例中位数的2倍。肿瘤特异性抗原的分析表明高亲和力的INDEL突变富集率是非同义SNV突变的3倍。相对于非同义SNV驱动的抗原,由INDEL驱动的抗原其突变特异性结合高9倍。对肾透明细胞癌患者的免疫基因的表达分析表明突变特异性抗原与递呈抗原基因表达上调相关,CD-8阳性测试显示其T细胞活化的相关因子为0.78。通过检免疫查点抑制剂治疗响应数据分析表明,移码变异数与检查点抑制剂对于黑色素瘤治疗显著相关(p=4·7×10-4)。

研究发现,在所有肿瘤种类中,肾细胞癌插入和缺失突变的比例和数量最多,插入和缺失突变是高度免疫原性突变类型,可引发抗原丰度以及突变特异性结合增加。

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    2018-06-08 minlingfeng
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    2018-04-29 howi
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