The S. cerevisiae m 6 A-reader Pho92 impacts meiotic recombination by controlling key methylated transcripts

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SUMMARY N 6 -methyladenosine (m 6 A), the most abundant internal modification of eukaryotic mRNAs, participates in the post-transcriptional control of gene expression. In Saccharomyces cerevisiae , m 6 A is only found during meiosis. Although the deletion of the m 6 A- methyltransferase Ime4 impairs this process, the molecular impact of m 6 A on gene expression remains ill defined. Here we investigated the function of the budding yeast m 6 A reader Pho92. We found that Pho92 is specifically expressed during meiosis and impacts meiotic progression. We used high-throughput RNA sequencing and mapping of Pho92-binding sites following UV-crosslinking to show that Pho92 is recruited to specific mRNAs in an m 6 A-dependent manner during the meiotic prophase, preceding their down-regulation. Strikingly, point mutations altering m 6 A sites in mRNAs targeted by Pho92 are sufficient to delay their down-regulation and, in one case, to impact meiotic progression. Altogether, our results indicate that Pho92 facilitate the meiotic progression by accelerating the down-regulation of timely-regulated mRNAs during meiotic recombination.

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