Establishing sharp and homogeneous segments in the hindbrain

Establishing sharp and homogeneous segments in the hindbrain
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在后脑中建立尖锐且均匀的部分

DOI:
10.12688/f1000research.15391.1
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
D. Wilkinson
D. Wilkinson
中科院分区:
--
文献类型:
--
作者:
D. Wilkinson

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对脊椎动物后脑的研究揭示了建立具有独特和同质区域身份的尖锐片段的平行机制。最近的工作揭示了细胞身份调节的作用及其与细胞分离的关系。在早期阶段,有重叠的Egr 2和Hoxb 1转录因子,指定不同的身份,这是解决相互抑制的片段边界的表达。计算机模拟表明,这种对细胞身份的动态调节与细胞分离协同作用,产生清晰的边界。片段之间的一些混合发生在早期阶段,并且异位egr 2表达细胞转换身份以匹配它们的新邻居。这种转换是由egr 2表达和维甲酸信号传导水平之间的耦合介导的,其在群体效应中起作用以维持均匀的节段身份。这些发现揭示了细胞分离和细胞身份的动态调节之间的相互作用,在后脑形成清晰的图案,并提出了类似的机制是否发生在其他组织的问题。
Studies of the vertebrate hindbrain have revealed parallel mechanisms that establish sharp segments with a distinct and homogeneous regional identity. Recent work has revealed roles of cell identity regulation and its relationships with cell segregation. At early stages, there is overlapping expression at segment borders of the Egr2 and Hoxb1 transcription factors that specify distinct identities, which is resolved by reciprocal repression. Computer simulations show that this dynamic regulation of cell identity synergises with cell segregation to generate sharp borders. Some intermingling between segments occurs at early stages, and ectopic egr2-expressing cells switch identity to match their new neighbours. This switching is mediated by coupling between egr2 expression and the level of retinoic acid signalling, which acts in a community effect to maintain homogeneous segmental identity. These findings reveal an interplay between cell segregation and the dynamic regulation of cell identity in the formation of sharp patterns in the hindbrain and raise the question of whether similar mechanisms occur in other tissues.
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