A tissue boundary orchestrates the segregation of inner ear sensory organs

A tissue boundary orchestrates the segregation of inner ear sensory organs
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组织边界协调内耳感觉器官的分离

DOI:
10.1101/2022.03.03.482809
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Chen Z
Chen Z
中科院分区:
--
文献类型:
--
作者:
Chen Z

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内耳包含不同的感觉器官,通过从发育中的耳泡中的大的感觉感受域分离而连续产生。为了了解这一过程的机械基础,我们调查了在前感觉细胞的图案,增殖和特性的一些前庭器官在小鼠和鸡耳泡分离过程中的变化。我们发现了一个专门的边界域,位于分离器官的界面处。它是由前感觉细胞逐渐扩大,延长,并最终从前感觉的命运转移。引人注目的是,边界细胞排列其顶端边界,并在表达或不表达Lmx1a转录因子(果蝇Apterous的直系同源物)的细胞界面处收缩。在Lmx1a缺陷的小鼠中,边界域是不存在的,其表现出感觉器官分离的缺陷,并且通过抑制ROCK依赖性肌动球蛋白收缩性而被破坏。总而言之,我们的研究结果表明,肌动球蛋白依赖性组织边界确保了内耳感觉器官的正确分离,并揭示了该过程与果蝇翼盘通过谱系限制边界的区室化之间惊人的相似性。
The inner ear contains distinct sensory organs, produced sequentially by segregation from a large sensory-competent domain in the developing otic vesicle. To understand the mechanistic basis of this process, we investigated the changes in prosensory cell patterning, proliferation and character during the segregation of some of the vestibular organs in the mouse and chicken otic vesicle. We discovered a specialized boundary domain, located at the interface of segregating organs. It is composed of prosensory cells that gradually enlarge, elongate and are ultimately diverted from a prosensory fate. Strikingly, the boundary cells align their apical borders and constrict basally at the interface of cells expressing or not the Lmx1a transcription factor, an orthologue of drosophila Apterous. The boundary domain is absent inLmx1a-deficient mice, which exhibit defects in sensory organ segregation, and is disrupted by the inhibition of ROCK-dependent actomyosin contractility. Altogether, our results suggest that actomyosin-dependent tissue boundaries ensure the proper separation of inner ear sensory organs and uncover striking homologies between this process and the compartmentalization of the drosophila wing disc by lineage-restricted boundaries.
在后脑中建立尖锐且均匀的部分
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