在FTO中,与肥胖相关的变体与IRX3形成了远程功能连接
Scott Smemo1, Juan J Tena2, Kyoung-Han Kim3
11] Department of Human Genetics, University of Chicago, Chicago, Illinois 60637, USA [2].
Nature
|March 21, 2014
概括
在FTO基因内子中的肥胖风险变异与IRX3基因调节有关,影响身体质量和新陈代谢. 在小鼠中,IRX3 缺乏可显著降低体重和脂肪量,突出其在代谢控制中的作用.
科学领域:
- 遗传学 是一个遗传学.
- 代谢疾病 代谢疾病
- 分子生物学分子生物学
背景情况:
- 全基因组关联研究 (GWAS) 将FTO基因变异与肥胖和2型糖尿病 (T2D) 风险联系起来.
- 以前的研究表明,FTO表达影响身体质量,但非编码变体的机制仍然不清楚.
研究的目的:
- 研究肥胖相关的FTO变体与基因调控之间的功能联系.
- 确定这些调节元件所针对的特定基因及其在体质控制中的作用.
主要方法:
- 染色体构造捕获和报告测试以确定基因相互作用.
- 分析人类脑组织和淘汰赛小鼠模型中的基因表达.
- 缺少Irx3的小鼠的表型特征,包括体重,组成和代谢率.
主要成果:
- 与肥胖相关的FTO区域与IRX3和FTO促进器相互作用,跨越大数据库距离.
- 在FTO区域的增强器调节IRX3表达,而不是FTO.
- IRX3表达,而不是FTO,与人类大脑中与肥胖相关的SNP相关.
- 缺少Irx3的小鼠由于脂肪流失和新陈代谢增加,体重减少了25-30%.
- 主导阴性Irx3的下丘脑表达模仿了这些代谢表型.
结论:
- IRX3是与肥胖相关的FTO变体的长距离功能目标.
- IRX3是一种新的体质和组成决定因素,通过下丘脑调节起作用.
- 这一发现为肥胖和代谢障碍的遗传调节提供了新的见解.
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