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GSBS Dissertations and Theses

Blastomeres

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Pos-1 Regulation Of Endo-Mesoderm Identity In C. Elegans: A Dissertation, Ahmed M. Elewa Apr 2014

Pos-1 Regulation Of Endo-Mesoderm Identity In C. Elegans: A Dissertation, Ahmed M. Elewa

GSBS Dissertations and Theses

How do embryos develop with such poise from a single zygote to multiple cells with different identities, and yet survive? At the four-cell stage of the C. elegans embryo, only the blastomere EMS adopts the endo-mesoderm identity. This fate requires SKN-1, the master regulator of endoderm and mesoderm differentiation. However, in the absence of the RNA binding protein POS-1, EMS fails to fulfill its fate despite the presence of SKN-1. pos-1(-) embryos die gutless. Conversely, the RNA binding protein MEX-5 prevents ectoderm blastomeres from adopting the endo-mesoderm identity by repressing SKN-1. mex-5(-) embryos die with excess muscle at the expense ...