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在NOTCH2NLC中扩展GGC重复的表达在小鼠模型中引起心脏功能障碍
Yongcheng Pan1,2, Ying Jiang3, Juan Wan4
1Department of Neurology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China.
Cell & bioscience
|August 29, 2023
概括
与NOTCH2NLC基因相关的神经内核包容性疾病 (NIID) GGC重复扩张导致心脏问题. 线粒体功能障碍在NIID患者和小鼠模型中导致这些心脏异常.
科学领域:
- 神经遗传学 神经遗传学
- 心血管研究研究心血管研究
- 线粒体生物学 线粒体生物学
背景情况:
- 神经内核包容性疾病 (NIID) 是一种罕见的神经退行性疾病,由NOTCH2NLC基因的GGC重复扩张引起.
- NIID呈现出各种神经症状,心脏参与越来越多地被怀疑但尚未完全理解.
- 将NOTCH2NLC基因突变与心脏功能障碍联系在一起的确切机制尚不清楚.
研究的目的:
- 在体内调查NOTCH2NLCGGC重复扩张和心脏异常之间的直接联系.
- 阐明线粒体功能障碍在NIID相关心脏病发病中的作用.
- 为了探索人类NIID患者的潜在心脏表现.
主要方法:
- 利用两个表达NOTCH2NLC-(GGC) 98的转基因小鼠模型,一个具有无处不在的表达,另一个具有心肌细胞特异性表达.
- 在小鼠模型中进行了病理和心声学评估,以评估心脏功能和结构.
- 进行了转录基因分析,以确定心脏受影响的分子通路,重点关注与线粒体和离子通道相关的基因表达.
- 分析了线粒体基因表达和电子运输链活动.
- 从NIID患者的心脏检查数据进行了追溯审查.
主要成果:
- 两种小鼠模型都在心肌细胞中产生了内核NOTCH2NLC-polyG入,并表现出心脏病理和心声学变化.
- 转录组分析显示,在两种模型中,参与线粒体功能和能量代谢的基因显著下调,在心肌细胞特异型模型中更为明显.
- 观察到线粒体相关基因的表达减少和电子运输链活动减少.
- 对NIID患者的回顾性分析发现了心脏异常,支持了体内发现.
结论:
- 这项研究提供了第一个 in vivo 证据,直接将NOTCH2NLC GGC重复扩张与心脏异常联系起来.
- 在NIID的背景下,线粒体功能障碍被确定为心脏异常发展的关键因素.
- 这些发现表明,在NIID患者的管理中,应考虑心脏评估.
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