1887

Abstract

Direct repeats (DRs) of 20–45 nucleotide conserved sequences (CS) and repeated CS (RCS), separated by non-conserved sequences up to 100 nucleotides long, were previously described in the 3′ untranslated region (3′UTR) of the three major mosquito-borne flavivirus (MBFV) subgroups, represented by , and . Each subgroup exhibits a specific pattern of DRs, the biological significance of which has not yet been adequately addressed. The DRs were originally identified using conventional alignment programs based on the assumption that genetic variation is driven primarily by nucleotide substitutions. Since there are no recognized alignment programs that can adequately accommodate very divergent sequences, a method has been devised to construct and analyse a substantially improved 3′UTR alignment between these highly divergent viruses, based on the concept that deletions and/or insertions, in addition to substitutions, are important drivers of 3′UTR evolution. This ‘robust alignment’ approach demonstrated more extensive homologies in the 3′UTR than had been recognized previously and revealed the presence of similar DRs, either intact or as sequence ‘remnants’, in all the MBFV subgroups. The relevance of these observations is discussed in relation to (i) the function of DRs as elements of replication enhancement, (ii) the evolution of RNA secondary structures and (iii) the significance of DRs and secondary structures in MBFV transmissibility between vertebrate and invertebrate hosts.

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2006-11-01
2019-09-18
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Comparative alignment between YFV and YFV-related viruses. [PDF](166 KB)

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Comparative alignment between the three major MBFV groups, JEV (WNV, JEV, MVEV, ALFV, KUNV, SLEV, KOKV and STRV), DENV (DENV-1, DENV-2, DENV-3, DENV-4) and YFV (W, CE and SA lineages) and YFV-related viruses (SEPV, UGSV, BANZV and YOKV). [PDF](244 KB)

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