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Micromere formation and its evolutionary implications in the sea urchin. | LitMetric

Micromere formation and its evolutionary implications in the sea urchin.

Curr Top Dev Biol

Department of Molecular Biology Cell Biology Biochemistry, Brown University, Providence, RI, United States. Electronic address:

Published: April 2022

AI Article Synopsis

Article Abstract

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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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8868499PMC
http://dx.doi.org/10.1016/bs.ctdb.2021.10.008DOI Listing

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