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Protein interactors of MEG-1 in C. elegans embryos

ABSTRACT: In animals with germ plasm, specification of the germline involves “germ granules”, cytoplasmic condensates that enrich maternal transcripts in the germline founder cells. In C. elegans embryos, P granules enrich maternal transcripts, but surprisingly P granules are not essential for germ cell fate specification. Here we have described a second condensate in the C. elegans germ plasm. Like canonical P-bodies found in somatic cells, “germline P-bodies” contain regulators of mRNA decapping and deadenylation and, in addition, the intrinsically-disordered proteins MEG-1 and MEG-2 and the TIS11-family RNA-binding protein POS-1. Embryos lacking meg-1 and meg-2 do not stabilize P-body components, miss-regulate POS-1 targets, miss-specify the germline founder cell, and do not develop a germline. Our findings suggest that specification of the germ line involves at least two distinct condensates that independently enrich and regulate maternal mRNAs in the germline founder cells.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Caenorhabditis Elegans

TISSUE(S): Embryo

SUBMITTER: Madeline Cassani

LAB HEAD: Geraldine Seydoux

PROVIDER: PXD036610 | Pride | 2022-10-05

REPOSITORIES: Pride

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			Action	DRS
	TB-CS-QE-211110_SeydouxG_MC_1__20p_MEG1_1.raw	Raw
	TB-CS-QE-211110_SeydouxG_MC_2__20p_MEG1_2.raw	Raw
	TB-CS-QE-211110_SeydouxG_MC_3__20p_N2_1.raw	Raw
	TB-CS-QE-211110_SeydouxG_MC_4__20p_N2_2.raw	Raw
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Specialized germline P-bodies are required to specify germ cell fate in C. elegans embryos

Project description:In animals with germ plasm, specification of the germline involves “germ granules”, cytoplasmic condensates that enrich maternal transcripts in the germline founder cells. In C. elegans embryos, P granules enrich maternal transcripts, but surprisingly P granules are not essential for germ cell fate specification. Here we describe a second condensate in the C. elegans germ plasm. Like canonical P-bodies found in somatic cells, “germline P-bodies” contain regulators of mRNA decapping and deadenylation and, in addition, the intrinsically-disordered proteins MEG-1 and MEG-2 and the TIS11-family RNA-binding protein POS-1. Embryos lacking meg-1 and meg-2 do not stabilize P-body components, miss-regulate POS-1 targets, miss-specify the germline founder cell, and do not develop a germline. Our findings suggest that specification of the germ line involves at least two distinct condensates that independently enrich and regulate maternal mRNAs in the germline founder cells.

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