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Viral Epitranscriptomics
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DOI：10.1128/JVI.02263-16.png)
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Although it has been known for over 40 years that eukaryotic mRNAs bear internal base modifications, it is only in the last 5 years that the importance of these modifications has begun to come into focus. The most common mRNA modification, the addition of a methyl group to the N-6 position of adenosine (m(6)A), has been shown to affect splicing, translation, and stability, and m(6)A is also essential for embryonic development in organisms ranging from plants to mice. While all viral transcripts examined so far have been found to be extensively m(6)A modified, the role, if any, of m(6)A in regulating viral gene expression and replication was previously unknown. However, recent data generated using HIV-1 as a model system strongly suggest that sites of m(6)A addition not only are evolutionarily conserved but also enhance virus replication. It is therefore likely that the field of viral epitranscriptomics, which can be defined as the study of functionally relevant posttranscriptional modifications of viral RNA transcripts that do not change the nucleotide sequence of that RNA, is poised for a major expansion in scientific interest and may well fundamentally change our understanding of how viral replication is regulated.
Keyword:
Posttranscriptional gene regulation
RNA modification
N-6-methyladenosine
mRNA function
mRNA stability
HIV-1
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