Translational repression by 4E-T is crucial to maintain the prophase-I arrest in vertebrate oocytes
Ontology highlight
ABSTRACT: Meiotic maturation of vertebrate oocytes occurs in the near-absence of transcription. Thus, female fertility relies on timely translational activation of maternal transcripts stockpiled in full-grown prophase-I-arrested oocytes. However, how expression of these mRNAs is suppressed to maintain the long-lasting prophase-I arrest remains mysterious. Utilizing fast-acting TRIM-Away, we demonstrate that acute loss of the translation repressor 4E-T triggers spontaneous release from prophase-I arrest in mouse and frog oocytes. This is due to untimely expression of key meiotic drivers like c-Mos and cyclin-B1. Notably, mutant 4E-T associated with premature ovarian insufficiency fails to maintain the prophase-I arrest in Xenopus oocytes. We further show that 4E-T association with eIF4E and PATL2 is critical for target mRNA binding and repression. Thus, 4E-T is a central factor in translational repression of mRNAs stockpiled in full-grown oocytes for later activation and, therefore, essential to sustain the oocyte pool throughout the reproductive lifespan of female vertebrates.
INSTRUMENT(S): Orbitrap Eclipse
ORGANISM(S): Xenopus Laevis (african Clawed Frog)
TISSUE(S): Oocyte
SUBMITTER:
Florian Stengel
LAB HEAD: Florian Stengel
PROVIDER: PXD062261 | Pride | 2025-07-18
REPOSITORIES: Pride
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