Journal
DEVELOPMENTAL CELL
Volume 53, Issue 5, Pages 545-+Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2020.04.018
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Funding
- Intramural Research Program of the NIH, National Institutes of Environmental Health Sciences [1ZIAES102985]
- Howard Hughes Medical Institute
- Lalor Foundation Postdoctoral Fellowship
- Eunice Kennedy Shriver National Institute of Child Health & Human Development of the NIH [F32HD094500]
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Embryonic genome activation (EGA) is orchestrated by an intrinsic developmental program initiated during oocyte maturation with translation of stored maternal mRNAs. Here, we show that tankyrase, a poly(ADP-ribosyl) polymerase that regulates beta-catenin levels, undergoes programmed translation during oocyte maturation and serves an essential role in mouse EGA. Newly translated TNKS triggers proteasomal degradation of axin, reducing targeted destruction of beta-catenin and promoting beta-catenin-mediated transcription of target genes, including Myc. MYC mediates ribosomal RNA transcription in 2-cell embryos, supporting global protein synthesis. Suppression of tankyrase activity using knockdown or chemical inhibition causes loss of nuclear beta-catenin and global reductions in transcription and histone H3 acetylation. Chromatin and transcriptional profiling indicate that development arrests prior to the mid-2-cell stage, mediated in part by reductions in beta-catenin and MYC. These findings indicate that post-transcriptional regulation of tankyrase serves as a ligand-independent developmental mechanism for post-translational beta-catenin activation and is required to complete EGA.
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