PABPN1L mediates cytoplasmic mRNA decay as a placeholder during the maternal‐to‐zygotic transition
- 17 June 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in EMBO Reports
- Vol. 21 (8), e49956
- https://doi.org/10.15252/embr.201949956
Abstract
Maternal mRNA degradation is a critical event of the maternal‐to‐zygotic transition (MZT) that determines the developmental potential of early embryos. Nuclear Poly(A)‐binding proteins (PABPNs) are extensively involved in mRNA post‐transcriptional regulation, but their function in the MZT has not been investigated. In this study, we find that the maternally expressed PABPN1‐like (PABPN1L), rather than its ubiquitously expressed homolog PABPN1, acts as an mRNA‐binding adapter of the mammalian MZT licensing factor BTG4, which mediates maternal mRNA clearance. Female Pabpn1l null mice produce morphologically normal oocytes but are infertile owing to early developmental arrest of the resultant embryos at the 1‐ to 2‐cell stage. Deletion of Pabpn1l impairs the deadenylation and degradation of a subset of BTG4‐targeted maternal mRNAs during the MZT. In addition to recruiting BTG4 to the mRNA 3ʹ‐poly(A) tails, PABPN1L is also required for BTG4 protein accumulation in maturing oocytes by protecting BTG4 from SCF‐βTrCP1 E3 ubiquitin ligase‐mediated polyubiquitination and degradation. This study highlights a noncanonical cytoplasmic function of nuclear poly(A)‐binding protein in mRNA turnover, as well as its physiological importance during the MZT.Keywords
Funding Information
- National Natural Science Foundation of China (31930031, 31890781, 31671558)
This publication has 58 references indexed in Scilit:
- Genetic programs in human and mouse early embryos revealed by single-cell RNA sequencingNature, 2013
- Specificity factors in cytoplasmic polyadenylationWIREs RNA, 2013
- PABPN1: molecular function and muscle diseaseThe FEBS Journal, 2013
- Poly(A) binding protein nuclear 1 levels affect alternative polyadenylationNucleic Acids Research, 2012
- Embryonic stem cell potency fluctuates with endogenous retrovirus activityNature, 2012
- The Poly(A)-Binding Protein Nuclear 1 Suppresses Alternative Cleavage and Polyadenylation SitesCell, 2012
- The maternal-to-zygotic transition: a play in two actsDevelopment, 2009
- An essential role for the RNA-binding protein Smaug during theDrosophilamaternal-to-zygotic transitionDevelopment, 2009
- Isolation of the human ePAB and ePABP2 cDNAs and analysis of the expression patternsJournal of Assisted Reproduction and Genetics, 2008
- Human TOB, an Antiproliferative Transcription Factor, Is a Poly(A)-Binding Protein-Dependent Positive Regulator of Cytoplasmic mRNA DeadenylationMolecular and Cellular Biology, 2007