期刊
EMBO REPORTS
卷 21, 期 8, 页码 -出版社
WILEY
DOI: 10.15252/embr.201949956
关键词
early embryo development; female fertility; maternal-effect gene; mRNA stability; RNA-binding protein
资金
- National Natural Science Foundation of China [31930031, 31890781, 31671558]
- National Key Research and Development Program of China [2017YFC1001500, 2016YFC1000600]
- Key Research and Development Program of Zhejiang Province [2017C03022]
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. FemalePabpn1lnull 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 ofPabpn1limpairs the deadenylation and degradation of a subset of BTG4-targeted maternal mRNAs during the MZT. In addition to recruiting BTG4 to the mRNA 3MODIFIER LETTER PRIME-poly(A) tails, PABPN1L is also required for BTG4 protein accumulation in maturing oocytes by protecting BTG4 from SCF-beta TrCP1 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.
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