TMTC4是一种特定于毛细胞的人类聋基因
Jiang Li1,2, Byung Yoon Choi3, Yasmin Eltawil4
1Department of Neurology and.
JCI insight
|November 9, 2023
概括
跨膜和四基重复4 (Tmtc4) 是一种耳聋基因. TMTC4变种通过增加未折叠蛋白响应 (UPR) 灵敏度,导致人类逐渐听力损失,使UPR与听力损失有关.
科学领域:
- 遗传学 遗传学 是一个
- 耳鼻喉科 耳鼻喉科 耳鼻喉科
- 细胞生物学 细胞生物学
背景情况:
- 跨膜和四基重复4 (Tmtc4) 在小鼠模型中被确定为聋症基因.
- Tmtc4淘汰赛 (KO) 的小鼠表现出与未折叠蛋白质反应 (UPR) 过度激活相关的快速,渐进的产后听力损失.
- 以前,Tmtc4在耳功能中的特定细胞机制和人类相关性尚不清楚.
研究的目的:
- 调查Tmtc4作为毛细胞特异性基因的作用,有助于听力损失.
- 确定Tmtc4变异在人类渐进性听力损失中的相关性.
- 阐明Tmtc4相关听力损失的细胞基础及其与UPR的联系.
主要方法:
- 产生一种毛细胞特异的条件Tmtc4 KO小鼠模型.
- 在Tmtc4缺乏的小鼠中听力损失的表型分析.
- 在一个有渐进性听力损失的人类家庭中,对Tmtc4变异的分离分析.
- 使用淋巴细胞和HEK293细胞进行体外研究,以评估UPR对亡的敏感性.
主要成果:
- 毛细胞特异性条件Tmtc4 KO小鼠模型重复了构成KO模型的听力损失表型,证实了Tmtc4在耳毛细胞中的作用.
- 人类TMTC4变异被确定并分离,在一个家庭中出现成人发病的渐进性听力损失.
- 人类TMTC4变种在细胞模型中表现出增加的UPR对细胞亡的过敏性.
结论:
- 证实TMTC4是人类渐进性听力损失的致病基因.
- 这些发现突显了TMTC4在维持耳功能和预防UPR诱导的亡方面的关键作用.
- 这项研究进一步表明,未展开的蛋白质响应 (UPR) 途径在渐进性听力损失的发病过程中起作用.
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