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M6A reader Pho92 is recruited co-transcriptionally and couples translation efficacy to mRNA decay to promote meiotic fitness in yeast [Polysome]

ABSTRACT: N6-methyladenosine (m6A) RNA modification impacts mRNA fate primarily via reader proteins, which dictate processes in development, stress, and disease. Yet little is known about m6A function in Saccharomyces cerevisiae, which occurs solely during early meiosis. Here we perform a multifaceted analysis of the m6A reader protein Pho92/Mrb1. Cross-linking immunoprecipitation analysis reveals that Pho92 associates with the 3’end of meiotic mRNAs in both an m6A-dependent and independent manner. Within cells, Pho92 transitions from the nucleus to the cytoplasm, and associates with translating ribosomes. In the nucleus Pho92 associates with target loci through its interaction with transcriptional elongator Paf1C. Functionally, we show that Pho92 promotes and links protein synthesis to mRNA decay. As such, the Pho92-mediated m6A-mRNA decay is contingent on active translation and the CCR4-NOT complex. We propose that the m6A reader Pho92 is loaded co-transcriptionally to facilitate correct translation and subsequent decay of m6A modified transcripts, and thereby promotes meiosis.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE193560 | GEO | 2022/12/06

REPOSITORIES: GEO

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m6A reader Pho92 is recruited co-transcriptionally and couples translation efficacy to mRNA decay to promote meiotic fitness in yeast [pho92D_ime4D]

Project description:N6-methyladenosine (m6A) RNA modification impacts mRNA fate primarily via reader proteins, which dictate processes in development, stress, and disease. Yet little is known about m6A function in Saccharomyces cerevisiae, which occurs solely during early meiosis. Here we perform a multifaceted analysis of the m6A reader protein Pho92/Mrb1. Cross-linking immunoprecipitation analysis reveals that Pho92 associates with the 3’end of meiotic mRNAs in both an m6A-dependent and independent manner. Within cells, Pho92 transitions from the nucleus to the cytoplasm, and associates with translating ribosomes. In the nucleus Pho92 associates with target loci through its interaction with transcriptional elongator Paf1C. Functionally, we show that Pho92 promotes and links protein synthesis to mRNA decay. As such, the Pho92-mediated m6A-mRNA decay is contingent on active translation and the CCR4-NOT complex. We propose that the m6A reader Pho92 is loaded co-transcriptionally to facilitate correct translation and subsequent decay of m6A modified transcripts, and thereby promotes meiosis.

2022-12-06 | GSE193559 | GEO

m6A reader Pho92 is recruited co-transcriptionally and couples translation efficacy to mRNA decay to promote meiotic fitness in yeast [ime1D_ndt80D]

2022-12-06 | GSE193558 | GEO

m6A reader Pho92 is recruited co-transcriptionally and couples translation efficacy to mRNA decay to promote meiotic fitness in yeast [iCLIP_miCLIP-seq]

Project description:During meiosis, in Saccharomyces cerevisiae, N6-methyladenosine (m6A) modified transcripts are induced, of which the function is unknown. Here, we uncover the role of the m6A reader Pho92. Cross-linking immunoprecipitation (CLIP) revealed that Pho92 associates with meiotic mRNAs in both m6A dependent and independent manner. Incidentally, Pho92 resides in the nucleus during early meiosis and associates with nascent RNAs, which is mediated through its interaction with Paf1C. Transcripts bound by Pho92 show elevated translational efficiency while cells lacking Pho92 display a small, but notable, increase in mRNA levels but not in protein levels, suggesting role of Pho92 in translation and decay. We show that Pho92 associates with ribosomes where it promotes the decay of m6A modified transcripts, contingent on active translation and the CCR4-NOT complex. We propose that m6A reader Pho92 is loaded co-transcriptionally to promote translation and subsequent decay fate of m6A modified transcripts, which ensures gamete fitness.

2022-12-06 | GSE193291 | GEO

The S. cerevisiae m6A reader Pho92 promotes timely meiotic recombination by controlling key methylated transcripts [CRAC]

Project description:We performed CRAC (UV-crosslinking and analysis of cDNA) to identify Ime4-dependent mRNA targets of Pho92 during meiosis at 5 hr in SPO.

2022-07-08 | GSE200088 | GEO

MOV10 facilitates messenger RNA decay in an N6-methyladenosine (m6A)-dependent manner to maintain the mouse embryonic stem cells state

Project description:N6-methyladenosine (m6A) is the most predominant internal mRNA modification in eukaryotes, recognised by its reader proteins (so-called m6A-readers) for regulating subsequent mRNA fates – splicing, export, localization, decay, stability and translation – to control several biological processes. Although a few m6A-readers have been identified, yet the list is incomplete. Here, we identify a new m6A-reader protein, MOV10, in mouse embryonic stem cells (mESCs). MOV10 recognises m6A-containing mRNAs with a conserved GGm6ACU motif. Mechanistic studies uncover that MOV10 bound m6A-containing mRNAs facilitate mRNA decay within the cytoplasmic processing bodies (P-bodies) in an m6A-dependent manner. Moreover, MOV10 decays the Gsk-3ß mRNA through m6A that stabilises the ß-CATENIN expression of a Wnt/ß-catenin signalling pathway to regulate downstream target expression of NANOG for maintaining the mESC state. Thus, our findings reveal how a newly identified m6A-reader, MOV10 mediates mRNA decay via m6A that impact ESC biology.

2024-01-15 | GSE181821 | GEO

N6-methyladenosine Modulates Messenger RNA Translation Efficiency

Project description:N6-methyladenosine (m6A) is the most abundant internal messenger (mRNA) modification in mammalian mRNA. This modification is reversible and non-stoichiometric, which potentially adds an additional layer of variety and dynamic control of mRNA metabolism. The m6A-modified mRNA can be selectively recognized by the YTH family “reader” proteins. The preferential binding of m6A-containing mRNA by YTHDF2 is known to reduce the stability of the target transcripts; however, the exact effects of m6A on translation has yet to be elucidated. Here we show that another m6A reader protein, YTHDF1, promotes ribosome loading of its target transcripts. YTHDF1 forms a complex with translation initiation factors to elevate the translation efficiency of its bound mRNA. In a unified mechanism of translation control through m6A, the YTHDF2-mediated decay controls the lifetime of target transcripts; whereas, the YTHDF1-based translation promotion increases the translation efficiency to ensure effective protein production from relatively short-lived transcripts that are marked by m6A. PAR-CLIP and RIP was used to identify YTHDF1 binding sites followed by ribosome profling and RNA seq to assess the consequences of YTHDF1 siRNA knock-down

2015-06-09 | E-GEOD-63591 | biostudies-arrayexpress

The S. cerevisiae m6A reader Pho92 impacts meiotic recombination by controlling key methylated transcripts.

Project description:The S. cerevisiae m6A reader Pho92 impacts meiotic recombination by controlling key methylated transcripts.

| PRJNA822912 | ENA

The S. cerevisiae m6A reader Pho92 impacts meiotic recombination by controlling key methylated transcripts [CRAC]

Project description:The S. cerevisiae m6A reader Pho92 impacts meiotic recombination by controlling key methylated transcripts [CRAC]

| PRJNA822916 | ENA

Yeast m6A methylated mRNAs are enriched on translating ribosomes during meiosis, and under Rapamycin treatment

Project description:Interest in mRNA methylation has exploded in recent years. The sudden interest in a 40 year old discovery was due in part to the recent finding of FTO?s (Fat Mass Obesity) N6-methyl-adenosine (m6A) deaminase activity, thus suggested a link between obesity-associated diseases and the presence of m6A in mRNA. Another catalyst of the sudden rise in mRNA methylation research was the release of mRNA methylomes for human, mouse and Saccharomyces cerevisiae. However, the molecular function, or functions of this mRNA ?epimark? remain to be discovered. There is supportive evidence that m6A could be a mark for mRNA degradation due to its binding to YTH domain proteins, and consequently being chaperoned to P bodies. Nonetheless, only a subpopulation of the methylome was found binding to YTHDF2 in HeLa cells. The model organism Saccharomyces cerevisiae, has only one YTH domain protein (Pho92, Mrb1), which targets PHO4 transcripts for degradation under phosphate starvation. However, mRNA methylation is only found under meiosis inducing conditions, and PHO4 transcripts are apparently non-methylated. In this paper we set out to investigate if m6A could function alternatively to being a degradation mark in S. cerevisiae, we also sought to test whether it can be induced under non-standard sporulation conditions. We find associations between the presence of m6A and message translatability. We also find m6A induction following prolonged rapamycin treatment. GeneChip analyses were performed to investigate the distribution of early meiotic transcripts (3hours) on different polysome and monosome fractions

2015-08-12 | E-GEOD-68435 | biostudies-arrayexpress

Cell cycle-dependent YTHDF2 promotes mitotic entry by repressing WEE1

Project description:The 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.

2020-01-01 | GSE134700 | GEO

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