2. Academic Validation
  3. Splice site m6A methylation prevents binding of U2AF35 to inhibit RNA splicing

Splice site m6A methylation prevents binding of U2AF35 to inhibit RNA splicing

  • Cell. 2021 Jun 10;184(12):3125-3142.e25. doi: 10.1016/j.cell.2021.03.062.
Mateusz Mendel 1,  Kamila Delaney 1,  Radha Raman Pandey 1,  Kuan-Ming Chen 1,  Joanna M Wenda 1,  Cathrine Broberg Vågbø 2,  Florian A Steiner 1,  David Homolka 3,  Ramesh S Pillai 4
Affiliations

Affiliations

  • 1 Department of Molecular Biology, Science III, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
  • 2 Proteomics and Modomics Experimental Core (PROMEC), Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU) and St. Olavs Hospital Central Staff, Trondheim, Norway.
  • 3 Department of Molecular Biology, Science III, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland. Electronic address: [email protected].
  • 4 Department of Molecular Biology, Science III, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland. Electronic address: [email protected].
PMID: 33930289 DOI: 10.1016/j.cell.2021.03.062
Abstract

The N6-methyladenosine (m6A) RNA modification is used widely to alter the fate of mRNAs. Here we demonstrate that the C. elegans writer METT-10 (the ortholog of mouse METTL16) deposits an m6A mark on the 3' splice site (AG) of the S-adenosylmethionine (SAM) synthetase pre-mRNA, which inhibits its proper splicing and protein production. The mechanism is triggered by a rich diet and acts as an m6A-mediated switch to stop SAM production and regulate its homeostasis. Although the mammalian SAM synthetase pre-mRNA is not regulated via this mechanism, we show that splicing inhibition by 3' splice site m6A is conserved in mammals. The modification functions by physically preventing the essential splicing factor U2AF35 from recognizing the 3' splice site. We propose that use of splice-site m6A is an ancient mechanism for splicing regulation.

Keywords

3' splice site; METT-10; METTL16; SAM homeostasis; SAM synthetase; U2AF35/65; U6 snRNA; m(6)A; spermatogenesis; splicing.

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