Spatiotemporal differences in otoconial gene expression.

Spatiotemporal differences in otoconial gene expression.
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DOI:
10.1002/dvg.22990
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发表时间:
2016-12
期刊:
Genesis (New York, N.Y. : 2000)
影响因子:
--
通讯作者:
Lundberg YW
Lundberg YW
中科院分区:
其他
文献类型:
--
作者:
Xu Y;Zhang Y;Lundberg YW

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耳石是由糖蛋白、蛋白多糖和CaCO 3组成的微小生物晶体,是椭圆囊和球囊中感觉加工不可缺少的物质。耳石异常和退化可导致或促进晶体移位到壶腹,导致眩晕和人体失衡。为了更好地了解控制耳石形成和维持的分子机制,我们采用全转录组测序(RNA-Seq)和定量RT-PCR技术,研究了小鼠内耳发育、成熟和衰老阶段耳石相关基因的时空表达差异。我们发现,大多数耳石基因的表达水平是高得多的椭圆囊和球囊相比,其他内耳组织出生后阶段之前,在C57 Bl/6 J小鼠,和这些基因的表达仅限于胚胎椭圆囊和球囊。出生后早期阶段,所有耳石基因的表达在椭圆囊和球囊急剧减少,而一些基因获得表达优势的老化壶腹,表明异位碎片形成的潜力,在后者的组织在老年。这些数据表明,耳石基因的表达在发育阶段的空间和时间上受到严格的调节,并可能在衰老阶段变得不受调节。
Otoconia are minute bio-crystals composed of glycoproteins, proteoglycans and CaCO3, and are indispensable for sensory processing in the utricle and saccule. Otoconia abnormalities and degeneration can cause or facilitate crystal dislocation to the ampulla, leading to vertigo and imbalance in humans. In order to better understand the molecular mechanism controlling otoconia formation and maintenance, we have examined the spatial and temporal expression differences of otoconial genes in the mouse inner ear at developmental, mature and aging stages using whole transcriptome sequencing (RNA-Seq) and quantitative RT-PCR. We show that the expression levels of most otoconial genes are much higher in the utricle and saccule compared to other inner ear tissues before postnatal stages in C57Bl/6J mice, and the expression of a few of these genes is restricted to the embryonic utricle and saccule. After the early postnatal stages, expression of all otoconial genes in the utricle and saccule is drastically reduced, while a few genes gain expression dominance in the aging ampulla, indicating a potential for ectopic debris formation in the latter tissue at old ages. The data suggest that the expression of otoconial genes is tightly regulated spatially and temporally during developmental stages and can become unregulated at aging stages.
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