A Drosophila model for Meniere's disease: Dystrobrevin is required for support cell function in hearing and proprioception.

A Drosophila model for Meniere's disease: Dystrobrevin is required for support cell function in hearing and proprioception.
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DOI:
10.3389/fcell.2022.1015651
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发表时间:
2022
影响因子:
5.5
通讯作者:
--
中科院分区:
生物学2区
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梅尼埃病(MD)是一种内耳疾病,其特征是与感音神经性听力损失和耳鸣相关的复发性眩晕发作。来自流行病学和全外显子组测序(WES)的证据表明,遗传易感性涉及多个基因,包括α-Dystrobrevin(DTNA)。在这里,我们研究一个果蝇模型。我们发现,突变,或敲低,在果蝇的DTNA直系同源物,Dystrobrevin(Dyb),导致本体感觉缺陷和受损的功能约翰斯顿的器官(JO),苍蝇的内耳。Dyb和肌营养不良蛋白-糖蛋白复合物(DGC)的另一种成分肌营养不良蛋白(Dys)在JO内的支持细胞中表达。它们的特定位置表明它们形成支持细胞接触的一部分,从而有助于维持血淋巴-神经元扩散屏障的完整性,这相当于血脑屏障。这些结果对人类状况具有重要意义,值得注意的是,我们注意到DTNA在哺乳动物内耳的等效细胞中表达。
Meniere’s disease (MD) is an inner ear disorder characterised by recurrent vertigo attacks associated with sensorineural hearing loss and tinnitus. Evidence from epidemiology and Whole Exome Sequencing (WES) suggests a genetic susceptibility involving multiple genes, including α-Dystrobrevin (DTNA). Here we investigate a Drosophila model. We show that mutation, or knockdown, of the DTNA orthologue in Drosophila, Dystrobrevin (Dyb), results in defective proprioception and impaired function of Johnston’s Organ (JO), the fly’s equivalent of the inner ear. Dyb and another component of the dystrophin-glycoprotein complex (DGC), Dystrophin (Dys), are expressed in support cells within JO. Their specific locations suggest that they form part of support cell contacts, thereby helping to maintain the integrity of the hemolymph-neuron diffusion barrier, which is equivalent to a blood-brain barrier. These results have important implications for the human condition, and notably, we note that DTNA is expressed in equivalent cells of the mammalian inner ear.
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