The chromatin remodelling factor Chd7 protects auditory neurons and sensory hair cells from stress-induced degeneration

The chromatin remodelling factor Chd7 protects auditory neurons and sensory hair cells from stress-induced degeneration
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染色质重塑因子 Chd7 保护听觉神经元和感觉毛细胞免受压力引起的退化

DOI:
10.1101/2021.01.05.425431
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Ahmed M
Ahmed M
中科院分区:
--
文献类型:
--
作者:
Ahmed M

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神经元和感觉细胞特别容易受到氧化应激的影响,这是由于它们在刺激感知和传递过程中的高需氧量。保护它们免受压力诱导的死亡和退化的机制仍然难以捉摸。在这里,我们表明,胚胎缺失的染色体结构域解旋酶DNA结合蛋白7(CHD7)在听觉神经元或毛细胞导致感音神经性听力损失由于出生后退化的两种细胞类型。从机制上讲,我们证明thatCHD7控制的主要压力途径组件的表达。在缺乏这种物质的情况下,毛细胞是高度敏感的,在短暂暴露于应激诱导物后迅速死亡,这表明听力开始时的声音引发了它们的退化。在人类中,CHD 7单倍不足导致CHARGE综合征,这是一种影响包括耳朵在内的多个器官的疾病。我们的研究结果表明,CHD7突变导致发育沉默的表型,使细胞易于出生后退化,由于保护机制的失败。
Neurons and sensory cells are particularly vulnerable to oxidative stress due to their high oxygen demand during stimulus perception and transmission. The mechanisms that protect them from stress-induced death and degeneration remain elusive. Here we show that embryonic deletion of the chromodomain helicase DNA-binding protein 7 (CHD7) in auditory neurons or hair cells leads to sensorineural hearing loss due to postnatal degeneration of both cell types. Mechanistically, we demonstrate thatCHD7controls the expression of major stress pathway components. In its absence, hair cells are hypersensitive, dying rapidly after brief exposure to stress inducers, suggesting that sound at the onset of hearing triggers their degeneration. In humans,CHD7haploinsufficiency causes CHARGE syndrome, a disorder affecting multiple organs including the ear. Our findings suggest thatCHD7mutations cause developmentally silent phenotypes that predispose cells to postnatal degeneration due to a failure of protective mechanisms.
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