BioProject

N6-methyladenosine (m6A), the most common internal RNA modification in eukaryotic mRNAs, is described to be abundantly present in the genomes of cytoplasmic-replicating RNA viruses. More...

N6-methyladenosine (m6A), the most common internal RNA modification in eukaryotic mRNAs, is described to be abundantly present in the genomes of cytoplasmic-replicating RNA viruses. Yet, how the host nuclear m6A writer has access to the viral RNAs in the cytoplasm and what are the associated biological consequences remain unknown . Here, we comprehensively addressed these questions by combining antibody-dependent (m6A-seq) and antibody-independent (SELECT and nanopore direct RNA sequencing) methods on the cytoplasmic-replicating Chikungunya virus (CHIKV) RNA, and found no evidence of m6A modifications. Moreover, depletion of m6A modification machinery components did not affect CHIKV infection, and CHIKV infection did not alter their cellular localization. Consistent with these observations, no m6A modifications were found in the RNA genome of the dengue virus (DENV), another cytoplasmic-replicating virus. Our results challenge the idea that m6A modification is a general trait of cytoplasmic-replicating RNA viruses and stress the need of confirming antibody-dependent detection of m6A modifications with orthogonal antibody-independent methods. Less...