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Learn MoreThe m6A modification regulates mRNA stability and translation. Here we show that transcriptomic m6A modification is dynamic and the m6A reader protein YTHDF2 promotes mRNA decay during the cell cycle. Depletion of YTHDF2 leads to the delay of mitotic entry due to overaccumulation of WEE1, a negative regulator of CDK1. We demonstrate that WEE1 transcripts contain m6A modification, which promotes their decay through the m6A reader YTHDF2. Moreover, we found that YTHDF2 protein stability is dependent on CDK1 activity. Thus, CDK1, YTHDF2, and WEE1 form a feedforward regulatory loop to promote mitotic entry. We further identified CUL1, CUL4A, DDB1, and SKP2 as components of E3 ubiquitin ligase complexes that mediate YTHDF2 proteolysis. Our study provides insights into how cell cycle mediators modulate transcriptomic m6A modification, which in turn regulates the cell cycle. SOURCE: Qili Fei (qfei@uchicago.edu) - Chuan He University of Chicago
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