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诱导多能干细胞中的SMAD2突变建模提供了对心血管疾病发病因子的洞察力
Tarsha Ward1, Sarah U Morton1,2, Gabriela Venturini1
1Department of Genetics Harvard Medical School Boston MA USA.
Journal of the American Heart Association
|March 3, 2025
概括
SMAD2变种破坏基因调节和染色质相互作用,这对心脏发育至关重要,解释了先天性心脏病 (CHD) 的变异. 了解这些分子效应有助于对不确定的SMAD2变体进行分类.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- SMAD2是人类发育的关键调节者,与转录因子相互作用.
- 异合体SMAD2功能丧失和误解变体与先天性心脏病 (CHD) 和动脉动脉瘤有关.
- 由SMAD2变异引起的不同心血管表型的分子机制尚未完全理解.
研究的目的:
- 调查SMAD2变异在心脏病背景下的转录和表观遗传影响.
- 为了阐明SMAD2误解变异的功能后果,不确定的临床意义.
主要方法:
- 对11,336名患有心脏病的参与者进行外测序,以确定罕见的SMAD2变异.
- 产生异源诱导多能干细胞 (iPSCs),具有异或同SMAD2变体.
- 使用大量RNA测序,通过测序 (ATAC-seq) 检测转移酶可访问染色体,并与SMAD2/3 ChIP-seq数据集成,分析iPSCs.
- 对心肌细胞分化和收缩性的评估.
主要成果:
- 三十名CHD参与者携带异合体SMAD2变体.
- SMAD2 脱素缺陷改变了染色质的可访问性,并调节了 385 个 SMAD 调节基因,包括 10 个 CHD 相关基因.
- 据预测,SMAD2单双缺陷会破坏与转录因子的相互作用,如NANOG,ETS,TEAD3/4,CREB1和AP1.1.
- 特定的SMAD2误解变体 (R114C,W274C) 与平分不充分性相比引发了明显的分子变化.
结论:
- 在心血管发育过程中,SMAD2平分不足会破坏关键的转录因子结合和染色素相互作用.
- 功能丧失和错误的SMAD2变体之间的分子结果的差异有助于CHD的表型多样性.
- 这些发现为分子分析提供了基础,以改善不确定的SMAD2变异的临床分类.
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