Widespread regulation of the maternal transcriptome by Nanos in Drosophila.

Autor: Marhabaie M; Department of Molecular Genetics, Department of Cancer Biology and Genetics, Center for RNA Biology, Ohio State University, Columbus, Ohio, United States of America., Wharton TH; Department of Molecular Genetics, Department of Cancer Biology and Genetics, Center for RNA Biology, Ohio State University, Columbus, Ohio, United States of America., Kim SY; Department of Molecular Genetics, Department of Cancer Biology and Genetics, Center for RNA Biology, Ohio State University, Columbus, Ohio, United States of America., Wharton RP; Department of Molecular Genetics, Department of Cancer Biology and Genetics, Center for RNA Biology, Ohio State University, Columbus, Ohio, United States of America.
Jazyk: angličtina
Zdroj: PLoS biology [PLoS Biol] 2024 Oct 14; Vol. 22 (10), pp. e3002840. Date of Electronic Publication: 2024 Oct 14 (Print Publication: 2024).
DOI: 10.1371/journal.pbio.3002840
Abstrakt: The translational repressor Nanos (Nos) regulates a single target, maternal hunchback (hb) mRNA, to govern abdominal segmentation in the early Drosophila embryo. Nos is recruited to sites in the 3' UTR of hb mRNA in collaboration with the sequence-specific RNA-binding protein Pumilio (Pum); on its own, Nos has no binding specificity. Nos is expressed at other stages of development, but very few mRNA targets that might mediate its action at these stages have been described. Nor has it been clear whether Nos is targeted to other mRNAs in concert with Pum or via other mechanisms. In this report, we identify mRNAs targeted by Nos via 2 approaches. First, we identify mRNAs depleted upon expression of a chimera bearing Nos fused to the nonsense mediated decay (NMD) factor Upf1. We find that, in addition to hb, Upf1-Nos depletes approximately 2,600 mRNAs from the maternal transcriptome in early embryos. Virtually all of these appear to be targeted in a canonical, hb-like manner in concert with Pum. In a second, more conventional approach, we identify mRNAs that are stabilized during the maternal zygotic transition (MZT) in embryos from nos- females. Most (86%) of the 1,185 mRNAs regulated by Nos are also targeted by Upf1-Nos, validating use of the chimera. Previous work has shown that 60% of the maternal transcriptome is degraded in early embryos. We find that maternal mRNAs targeted by Upf1-Nos are hypoadenylated and inefficiently translated at the ovary-embryo transition; they are subsequently degraded in the early embryo, accounting for 59% of all destabilized maternal mRNAs. We suggest that the late ovarian burst of Nos represses a large fraction of the maternal transcriptome, priming it for later degradation by other factors in the embryo.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Marhabaie et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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