NEJM:ASGR1变异与冠状动脉疾病风险的降低有关

2016-05-19 Mechront 译 MedSci原创

现已知几个序列变异会影响非-高密度脂蛋白(HDL)胆固醇的血清水平,进而改变冠状动脉疾病的风险。 研究者对2636名冰岛人进行基因测序,发现变异,然后输入到近398,000名冰岛人的基因组中。再通过119,146名样本,测试输入的变异和非HDL胆固醇水平的关系。接着在2个欧洲血统的人群中重复试验,评估了有牵连的功能丧失变异对冠状动脉疾病风险的影响,其中试验组和对照组分别有42,524和249

现已知几个序列变异会影响非-高密度脂蛋白(HDL)胆固醇的血清水平,进而改变冠状动脉疾病的风险。

研究者对2636名冰岛人进行基因测序,发现变异,然后输入到近398,000名冰岛人的基因组中。再通过119,146名样本,测试输入的变异和非HDL胆固醇水平的关系。接着在2个欧洲血统的人群中重复试验,评估了有牵连的功能丧失变异对冠状动脉疾病风险的影响,其中试验组和对照组分别有42,524和249,414人。此外研究者还筛查了额外的目标基因功能丧失变异的基因扩充集。评估了有牵连的变异对蛋白质稳定性的影响。

ASGR1,编码去唾液酸糖蛋白受体(循环糖蛋白的平衡中起作用)的亚基,其存在罕见变异,内含子4缺失非编码的12碱基对(del12)。del12突变激活一个神秘的剪接位点,导致移码突变和一个提前终止密码子,使一个截短的蛋白容易降解。突变的杂合子携带者(本研究人群中发生率1/120)有更低水平的非HDL胆固醇(相比非携带者),两者相差15.3 mg/dl(0.40 mmol/l)(P=1.0×10−16);此外杂合子携带者冠状动脉疾病风险也更低(降低34%; 95% CI, 21 - 45; P=4.0×10−6)。冰岛人的一个更大的测序样品中,研究者发现另外一个ASGR1的功能丧失变异(p.W158X, 携带率 1/1850),同样可以降低非HDL胆固醇水平(P=1.8×10−3)。

研究结果表明,ASGR1单倍剂量不足与非HDL胆固醇水平的下降和冠状动脉疾病风险的降低有关。

原始出处:

Paul Nioi, Asgeir Sigurdsson,et al.Variant ASGR1 Associated with a Reduced Risk of Coronary Artery Disease.NEJM.May 18, 2016

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