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Development 2022 Nov 01;14921:. doi: 10.1242/dev.200900.
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The translation regulator Zar1l controls timing of meiosis in Xenopus oocytes.

Heim A , Niedermeier ML , Stengel F , Mayer TU .

Oocyte maturation and early embryo development occur in vertebrates in the near absence of transcription. Thus, sexual reproduction of vertebrates critically depends on the timely translation of mRNAs already stockpiled in the oocyte. Yet how translational activation of specific mRNAs is temporally coordinated is still incompletely understood. Here, we elucidate the function of Zar1l, a yet uncharacterized member of the Zar RNA-binding protein family, in Xenopus oocytes. Employing TRIM-Away, we demonstrate that loss of Zar1l accelerates hormone-induced meiotic resumption of Xenopus oocytes due to premature accumulation of the M-phase-promoting kinase cMos. We show that Zar1l is a constituent of a large ribonucleoparticle containing the translation repressor 4E-T and the central polyadenylation regulator CPEB1, and that it binds directly to the cMos mRNA. Partial, hormone-induced degradation of Zar1l liberates 4E-T from CPEB1, which weakens translational repression of mRNAs encoding cMos and likely additional M-phase-promoting factors. Thus, our study provides fundamental insights into the mechanisms that ensure temporally regulated translation of key cell cycle regulators during oocyte maturation, which is essential for sexual reproductivity.

PubMed ID: 36278895
Article link: Development
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: btg4 cdk1 cpeb1 ctrl ddx6 myc pabpc1l pabpc4 tpx2 zar1 zar1l zar1l
GO keywords: nuclear envelope [+]
Antibodies: Dctn1 Ab1 FLAG Ab3 Mapk1 Ab14 Mos Ab2

Article Images: [+] show captions