Abstract:
:RNA viruses are classified by their genome polarity and replication strategies. Nucleotide composition and codon usage differ among virus groups, for instance positive-sense RNA (+ssRNA) viruses have higher GC-content than the other RNA virus groups. Codon usage of +ssRNA viruses is closer to humans showing significantly higher codon adaptation index (CAI) than those of negative-sense RNA (-ssRNA), double stranded RNA (dsRNA) and retroviruses. Ambisense viruses have high CAI comparable to that of +ssRNA virus despite their lower GC content, whereas dsRNA viruses have the lowest CAI. This may provide a benefit for +ssRNA viruses as their genomes are used as mRNA. However, analyses for influence of nucleotide composition on codon usage did not show a difference between +ssRNA and -ssRNA viruses. This suggests that genome composition and hence mutational pressure remain the major pressure causing the differences in codon usage among RNA viruses with different genome types.
journal_name
Arch Viroljournal_title
Archives of virologyauthors
Phakaratsakul S,Sirihongthong T,Boonarkart C,Suptawiwat O,Auewarakul Pdoi
10.1007/s00705-018-3930-7subject
Has Abstractpub_date
2018-10-01 00:00:00pages
2883-2888issue
10eissn
0304-8608issn
1432-8798pii
10.1007/s00705-018-3930-7journal_volume
163pub_type
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