Harmonin mutations cause mechanotransduction defects in cochlear hair cells.

Harmonin mutations cause mechanotransduction defects in cochlear hair cells.
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DOI:
10.1016/j.neuron.2009.04.006
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发表时间:
2009-05-14
期刊:
影响因子:
16.2
通讯作者:
Mueller, Ulrich
Mueller, Ulrich
中科院分区:
医学1区
文献类型:
--
作者:
Grillet, Nicolas;Xiong, Wei;Reynolds, Anna;Kazmierczak, Piotr;Sato, Takashi;Lillo, Concepcion;Dumont, Rachel A.;Hintermann, Edith;Sczaniecka, Anna;Schwander, Martin;Williams, David;Kachar, Bechara;Gillespie, Peter G.;Mueller, Ulrich

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在毛细胞中,机械转导通道由尖端链接门控,尖端链接是由钙粘蛋白23(CDH 23)和原钙粘蛋白15(PCDH 15)组成的细胞外丝,并连接每个毛细胞的静纤毛。然而,哪些分子介导钙粘蛋白在尖端连接的功能尚不清楚。在这里,我们表明,PDZ结构域蛋白harmonin是一个组成部分的上tip-link密度(Udash),其中CDH 23插入到立纤毛膜。协调蛋白结构域介导与CDH 23和F-actin的相互作用,控制协调蛋白在静纤毛中的定位,并且是正常听力所必需的。在表达突变harmonin蛋白的小鼠中,防止Urea形成,毛束对机械刺激的敏感性降低。我们的结论是,谐波是一个Urestrial组件,并有助于建立位移的机械转导通道的敏感性。
In hair cells, mechanotransduction channels are gated by tip links, the extracellular filaments that consist of cadherin 23 (CDH23) and protocadherin 15 (PCDH15) and connect the stereocilia of each hair cell. However, which molecules mediate cadherin function at tip links is not known. Here we show that the PDZ-domain protein harmonin is a component of the upper tip-link density (UTLD), where CDH23 inserts into the stereociliary membrane. Harmonin domains that mediate interactions with CDH23 and F-actin control harmonin localization in stereocilia and are necessary for normal hearing. In mice expressing a mutant harmonin protein that prevents UTLD formation, the sensitivity of hair bundles to mechanical stimulation is reduced. We conclude that harmonin is a UTLD component and contributes to establishing the sensitivity of mechanotransduction channels to displacement.
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