Micromere formation and its evolutionary implications in the sea urchin.

Micromere formation and its evolutionary implications in the sea urchin.
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DOI:
10.1016/bs.ctdb.2021.10.008
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发表时间:
2022
影响因子:
--
通讯作者:
Yajima M
Yajima M
中科院分区:
生物学2区
文献类型:
--
作者:
Emura N;Yajima M

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海胆胚胎的微裂球与其他卵裂球不同。当它们在8至16个细胞阶段通过不对称细胞分裂产生后,微粒立即发挥组织者的作用。它们也致力于特定的细胞命运,如幼虫骨骼发生细胞和原始生殖细胞,而其他卵裂球在16细胞阶段保持可塑性和未定型。在棘皮动物门中,只有海胆(海胆纲)的胚胎在早期胚胎发生过程中形成作为明显组织者的微粒。因此,认为微粒是衍生特征,发育系统的修饰允许这种独特细胞谱系的进化引入。在这一章中,我们总结了历史和最近的观察,展示了独特的性能的微粒,并讨论了如何这一血统的微粒可能出现在棘皮动物的进化。
The micromeres of the sea urchin embryo are distinct from other blastomeres. After they arise through an asymmetric cell division at the 8- to 16-cell stage, micromeres immediately function as organizers. They also commit themselves to specific cell fates such as larval skeletogenic cells and primordial germ cells, while other blastomeres remain plastic and uncommitted at the 16-cell stage. In the phylum Echinodermata, only the sea urchin (class Echinoidea) embryo forms micromeres that serve as apparent organizers during early embryogenesis. Therefore, it is considered that micromeres are the derived features and that modification(s) of the developmental system allowed evolutionary introduction of this unique cell lineage. In this chapter, we summarize the both historic and recent observations that demonstrate unique properties of micromeres and discuss how this lineage of micromeres may have arisen during echinoderm evolution.
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