PubMed · 9644880
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F Fernández-Bañares, A Salas, M Forné, M Esteve, J C Espinós, J M Viver. 1998. [Collagenous colitis].. https://pubmed.ncbi.nlm.nih.gov/9644880/
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To elucidate the evolution of SEN virus (SEN-V), serial sequences of chronically SEN-V-infected patients were analyzed. In the hypervariable regions, non-synonymous substitutions significantly predominated. This could be attributed to positive selection in evading immune surveillance of the hosts and to establish a persistent infection. On the basis of the sequences in the two open reading frames of SEN-V DNA, the rate of synonymous substitutions was 7.32 x 10(-4) per site per year. Since this rate is close to RNA viruses and higher than other DNA viruses, the SEN-V might be replicated by machinery with poor or no proofreading function.
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