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综合的多组学方法显示TTNtv c.13254T>G在小鼠中引起扩张性心肌病
Dan Yu1, Liang Tao1, Laichun Song1
1Division of Cardiac Surgery & Wuhan Clinical Research Center for Cardiomyopathy, Wuhan Asia Heart Hospital Affiliated with Wuhan University of Science and Technology, Wuhan, Hubei, P.R. China.
PloS one
|October 4, 2024
概括
一种新型的titin截断变体 (TTNtv) c.13254T>G通过诱导小鼠的心脏损伤和炎症引起扩张性心肌病 (DCM). 这项研究为DCM中TTNtv病原性提供了功能性证据.
科学领域:
- 心血管遗传学 心血管遗传学
- 分子心脏病学分子心脏病学
- 遗传病理学遗传病理学
背景情况:
- 提丁切断变体 (TTNtv) 是扩展性心肌病 (DCM) 的主要遗传原因.
- 一种特定的异构体TTNtv,c.13254T>G (p.Tyr4418Ter),以前与DCM有关,但缺乏功能验证.
- 了解TTNtv致病性的精确机制对于DCM研究至关重要.
研究的目的:
- 为了功能地证明新型TTNtv变异c.13254T>G.的致病性.
- 在临床前模型中,研究这种TTNtv对心脏结构和分子通路的影响.
- 提供证据支持TTNtv c.13254T>G在DCM发展中的作用.
主要方法:
- 一个CRISPR/Cas9介导的小鼠模型的生成,模仿TTNtv c.13254T>G (Y4370*).
- 使用传输电子显微镜 (TEM),免疫组织化学,西部斑点 (WB),RNA测序 (RNA-seq) 和TMT蛋白质组分析,对突变 (KO) 和野生型 (WT) 鼠的心脏组织进行全面分析.
- 多omics关联分析以评估心脏损伤,炎症和Titin蛋白质变化.
主要成果:
- 在KO小鼠的心脏组织中,TEM揭示了肌纤维细胞的破坏,稀疏的肌纤维结构和Z线/H区异常.
- 免疫组织化学表明,KO小鼠的心脏形素T (cTnT) 和瘤坏死因子-α (TNF-α) 表达显著增加.
- RNA-seq和TMT蛋白质组分析证实TTNtv Y4370*诱导心脏损伤和KO小鼠的炎症反应.
结论:
- 在小鼠模型中,TTNtv c.13254T>G变异诱导心脏损伤,炎症和结构变化.
- 这些发现提供了功能性证据,表明TTNtv c.13254T>G是一种致病变体,有助于DCM.
- 这项研究对人类群体中DCM的未来遗传研究具有重大意义.
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