No evidence for epitranscriptomic m5C modification of SARS-CoV-2, HIV and MLV viral RNA
- 1 Medical University of Innsbruck, Biocenter, Institute of Molecular Biology;
- 2 Medical University of Innsbruck, Department of Hygiene, Microbiology and Public Health, Institute of Virology;
- 3 Medical University of Innsbruck, Biocenter, Institute of Bioinformatics
- ↵* Corresponding author; email: alexandra.lusser{at}i-med.ac.at
Abstract
The addition of chemical groups to cellular RNA to modulate RNA fate and/or function is summarized under the term epitranscriptomic modification. More than 170 different modifications have been identified on cellular RNA, such as tRNA, rRNA and, to a lesser extent, on other RNA types. Recently, epitranscriptomic modification of viral RNA has received considerable attention as a possible additional mechanism regulating virus infection and replication. N6-methyladenosine (m6A) and C5-methylcytosine (m5C) have been most broadly studied in different RNA viruses. Various studies, however, reported varying results with regard to number and extent of the modification. Here we investigated the m5C methylome of SARS-CoV-2, and we re-examined reported m5C sites in HIV and MLV. Using a rigorous bisulfite-sequencing protocol and stringent data analysis, we found no evidence for the presence of m5C in these viruses. The data emphasize the necessity for optimizing experimental conditions and bioinformatic data analysis.
Keywords
- Received December 7, 2022.
- Accepted February 27, 2023.
- Published by Cold Spring Harbor Laboratory Press for the RNA Society
This article, published in RNA, is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.
