错误拼接的转录在与TDP-43相关的ALS/FTD中产生新的蛋白质
Sahba Seddighi1,2, Yue A Qi3, Anna-Leigh Brown4
1National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.
Science translational medicine
|January 26, 2024
概括
丢失TDP-43蛋白质会导致神秘的外,从而导致神经元和患者体液中的新蛋白质. 这一发现提供了关于肌缩侧面硬化症 (ALS) 和前性痴呆症 (FTD) 疾病机制的见解.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- TDP-43蛋白质功能障碍与肌缩性侧面硬化症 (ALS) 和前性痴呆症 (FTD) 有关.
- 丧失TDP-43的功能会导致转录中加密的外子被包含,这可能导致细胞功能障碍.
- 隐秘的外子纳入的功能后果,特别是蛋白质生成,尚未得到充分理解.
研究的目的:
- 调查TDP-43损失产生的神秘外基能是否可以产生新型蛋白质.
- 为了确定这些de novo蛋白在患者样本中是否可检测.
- 探索隐秘的外基子衍生对蛋白质相互作用的功能影响.
主要方法:
- 使用了人类诱导多能干细胞 (iPSC) 衍生的神经元,缺乏TDP-43.
- 进行了协调的转录组和蛋白组分析.
- 分析了ALS/FTD患者的脑脊液 (CSF).
主要成果:
- 鉴定了65种,与TDP-43贫乏神经元中的12个神秘外形进行映射.
- 在神经元中发现的神秘外形预测了TDP-43蛋白质病变患者死后脑组织中的外形.
- 在ALS/FTD患者的CSF中检测到来自13个基因的18个de novo.
- 证明了神秘的序列改变了蛋白质相互作用.
结论:
- 隐秘的外因转换在TDP-43贫乏的神经元和ALS/FTD患者的中枢神经中产生新的蛋白质.
- 这一发现揭示了ALS/FTD病理生理学的新机制.
- 在CSF中的de novo可以作为TDP-43功能的生物标志物.
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