Abstract
RNA interference is a widely conserved mechanism of gene regulation and silencing across eukaryotes. In C. elegans, RNA silencing is coordinated through perinuclear nuage containing at least four granules: P granules, Z granules, Mutator foci, and SIMR foci. Embryonic localization of these granules is known for all except SIMR foci. Here we establish that SIMR foci first appear at the nuclear periphery in the P4 germline blastomere and become numerous and bright in the Z2 and Z3 progenitor germ cells. This timing coincides with the appearance or de-mixing of other germline granules, providing further evidence for coordinated germ granule reorganization.
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