人类TMC1和TMC2是机械关闭的离子通道
Songdi Fu1, Xueqi Pan2, Mingshun Lu3
1Institute of Molecular Physiology, Shenzhen Bay Laboratory, Shenzhen, China; Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
跨膜通道样蛋白1和2 (TMC1/2) 被确定为机械激活的离子通道. 这项研究证实了它们在头发细胞中的功能,这对听力至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
- 生物物理学的生物物理.
背景情况:
- 哺乳动物的跨膜通道样蛋白1和2 (TMC1/2) 是毛细胞中机械转导的候选蛋白.
- 之前的研究缺乏机械门的证据,因为TMC1/2在培养细胞中的错位化.
研究的目的:
- 确定膜局部化的TMC1/2突变体,并证明它们在异质细胞中的机械关.
- 为了确认野生类型的人类TMC1/2在血膜中的定位和功能.
- 调查TMC1/2作为孔形成机械传导通道的作用.
主要方法:
- 与OSCA1.1和点突变的域交换以实现小鼠TMC1/2.2的膜局部化.
- 全基因组CRISPRi查野生类型人类TMC1/2血局部化.
- 电生理学记录 (全细胞和单通道) 来评估机械门和离子通道活动.
主要成果:
- 识别了膜局部化的小鼠TMC1/2突变,它们是机械关闭的.
- 实现了野生类型人类TMC1/2的血局部化,该人对机械刺激做出了反应.
- 证明了拉伸激活电流和单通道活动的人类TMC1/2.2.
- 与聋相关的TMC1突变影响了离子通道特性,证实TMC1/2是毛孔形成通道.
结论:
- 人类TMC1/2是形成孔隙的,机械激活的离子通道.
- 提供了强有力的证据,支持TMC1/2作为听觉毛细胞中基本机械传导通道的作用.
- 解决了关于TMC1/2功能在机械传导中的争议.
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