Nucleic Acids Res, auth.: group Roignant

Comprehensive map of ribosomal 2′-O-methylation and C/D box snoRNAs in Drosophila melanogaster

Athena Sklias 1Sonia Cruciani 2Virginie Marchand 3Mariangela Spagnuolo 4Guillaume Lavergne 1Valérie Bourguignon 3Alessandro Brambilla 5René Dreos 1Steven J Marygold 6Eva Maria Novoa 2 7Yuri Motorin 3Jean-Yves Roignant 1 4

. 2024 Apr 12;52(6):2848-2864.

 doi: 10.1093/nar/gkae139.


During their maturation, ribosomal RNAs (rRNAs) are decorated by hundreds of chemical modifications that participate in proper folding of rRNA secondary structures and therefore in ribosomal function. Along with pseudouridine, methylation of the 2′-hydroxyl ribose moiety (Nm) is the most abundant modification of rRNAs. The majority of Nm modifications in eukaryotes are placed by Fibrillarin, a conserved methyltransferase belonging to a ribonucleoprotein complex guided by C/D box small nucleolar RNAs (C/D box snoRNAs). These modifications impact interactions between rRNAs, tRNAs and mRNAs, and some are known to fine tune translation rates and efficiency. In this study, we built the first comprehensive map of Nm sites in Drosophila melanogaster rRNAs using two complementary approaches (RiboMethSeq and Nanopore direct RNA sequencing) and identified their corresponding C/D box snoRNAs by whole-transcriptome sequencing. We de novo identified 61 Nm sites, from which 55 are supported by both sequencing methods, we validated the expression of 106 C/D box snoRNAs and we predicted new or alternative rRNA Nm targets for 31 of them. Comparison of methylation level upon different stresses show only slight but specific variations, indicating that this modification is relatively stable in D. melanogaster. This study paves the way to investigate the impact of snoRNA-mediated 2′-O-methylation on translation and proteostasis in a whole organism.