遗传变异塑造了小鼠脂肪组织中的染色质可访问性景观和转录反应
Juho Mononen1, Mari Taipale2, Marjo Malinen3,4
1Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland.
PLoS genetics
|January 16, 2026
概括
遗传变异导致染色质可访问性的差异,影响小鼠模型中的基因调节和疾病易感性. 这些发现将遗传差异与关键代谢组织中活跃调节区域的变化联系起来.
科学领域:
- 基因组学就是基因组学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 系统生物学 系统生物学
背景情况:
- 与疾病相关的遗传变异通常存在于非编码基因组区域.
- 改变的转录因子 (TF) 结合是将变异与疾病易感性联系起来的关键机制.
- 杂交小鼠菌株之间的遗传差异影响了基因调节和染色体格局.
研究的目的:
- 研究基因变异如何影响小鼠外皮膜白脂肪组织 (eWAT) 中的染色质可访问性.
- 确定遗传差异在多基因肥胖的小鼠模型中的基因调节和染色质可访问性的作用.
主要方法:
- 使用ATAC-seq用于染色质可访问性和H3K27acChIP-seq用于活性调节区域.
- 综合的多omics数据 (ATAC-seq,H3K27ac ChIP-seq,RNA-seq) 来自C57BL/6J和129S1/SvImJ小鼠在不同的饮食下.
- 采用足迹分析来评估转基因变异地点的TF占用率.
主要成果:
- 染色质可访问性差异主要是菌株特异性的,并由遗传变异驱动.
- 在eWAT中,特定于组织的TF结合点位于具有TF动机改变变异的活性调节区域.
- 与TF结合动机得分相关的TF占用率在基因改变的位置.
- 差异表达的基因在差异可访问的区域附近发现,其中包含在肝脏组织中验证的遗传变异.
结论:
- 遗传变异是代谢相关的小鼠组织中差异色素可访问性的主要驱动因素.
- 这些发现突显了多基因肥胖模型中遗传变异,染色质可访问性和基因表达之间的联系.
- 这项研究提供了对基因对复杂疾病的贡献背后的调控机制的见解.
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