9p21 与冠状动脉疾病相关的DNA变异会损害干扰素-γ信号响应
Olivier Harismendy1, Dimple Notani, Xiaoyuan Song
1Department of Pediatrics and Rady's Children's Hospital, University of California at San Diego, School of Medicine, La Jolla, California 92093, USA.
Nature
|February 11, 2011
概括
9p21区域的遗传变异与冠状动脉疾病 (CAD) 和2型糖尿病有关. 这项研究确定了9p21中的增强剂,揭示了风险等位基因如何破坏STAT1结合并影响对炎症反应的基因表达.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 心血管遗传学 心血管遗传学
背景情况:
- 全基因组关联研究 (GWAS) 已经将9p21基因沙漠中的单核酸多态 (SNP) 与冠状动脉疾病 (CAD) 和2型糖尿病联系起来.
- 这些遗传关联背后的精确生物机制仍然在很大程度上无法解释,尽管有证据表明相关基因组区域的调节作用.
研究的目的:
- 识别和描述9p21位置内的监管要素.
- 阐明CAD相关SNP对基因调节和细胞反应的功能影响.
- 研究远程基因组相互作用及其在疾病易感性中的作用.
主要方法:
- 在9p21位点中的增强剂的识别和表征.
- 分析STAT1结合及其对淋巴细胞细胞系中CDKN2BAS表达的影响.
- 使用一种新的方法来检测人类血管内皮细胞中的长距离染色质相互作用.
- 研究干扰素γ激活对9p21位点内的染色质结构和基因表达的影响.
主要成果:
- 对于预测增强剂来说,9p21位点非常丰富,比整个基因组要丰富得多.
- 在rs10811656和rs10757278的CAD风险等位基因破坏了增强剂内的STAT1结合位.
- STAT1结合负面调节CDKN2BAS表达,这是一个由CAD风险等位基因影响的过程.
- 增强器区域与CDKN2A/B和MTAP基因以及IFNA21下游的一个区间进行物理相互作用.
- 干扰素-γ的激活极大地改变了血管内皮细胞中的9p21位点中的染色质结构,STAT1结合,增强剂相互作用和基因表达.
结论:
- 9p21位点含有众多增强剂,在调节邻近基因方面发挥着关键作用.
- 对CAD的遗传敏感性与血管细胞的炎症反应途径有关,通过破坏STAT1介导的基因调节.
- GWAS的发现可以有效地引导研究向新的基因组区域和与疾病病因学相关的生物机制.
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