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GUT:中国胃癌患者易感基因的全基因组关联及功能分析

2019-08-13 MedSci MedSci原创

研究人员确定了12个与中国人群中GC风险相关的基因,并解释了5p13.1-PRKAA1和10q23.33-noc3l在胃癌发生机制中的作用

目的遗传位点与癌(GC)的风险相关的潜在机制尚不清楚,近日研究人员考察了新易感基因与GC发育的相关机制。

研究人员对四项全基因组关联研究(GWASs)进行了Meta分析,包括3771例病例和5426例对照者。在靶向测序和功能注释后,进行了体外和体内实验,以确定基因变异和候选基因的功能。此外,我们从其他5项研究中选出了7035例病例和8323例对照者,对33种变异体的GC相关性进行了考察。

GWASs的Meta分析发现,在p<5×10-8时,1q22、5p13.1和10q23.33位点突变与癌风险相关,在p<0.05时验证了7个已知位点。对于5p13.1位点,rs59133000[C]等位基因增强NF-κB1(核因子κB亚基1)与PRKAA1启动子的结合亲和力,导致启动子活性降低,表达降低。PRKAA1基因敲除对胃癌细胞增殖和裸鼠移植瘤生长均有促进作用。对于10q23.33位点,rs3781266[C]和rs 3740365[T]风险等位基因在完全连锁不平衡状态下,分别破坏和产生了POU2F1和PAX 3的结合基序,从而增强了NOC3L的活性和表达,而NOC3L的敲除抑制了GC细胞的生长。另外发现了3q11.2(OR=1.21)和4q28.1(OR=1.14)两个胃癌风险相关位点。

研究人员确定了12个与中国人群中GC风险相关的基因,并解释了5p13.1-PRKAA1和10q23.33-noc3l在胃癌发生机制中的作用。

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