We analysed the complete coding sequences of all recognized species of -borne flavivirus, including previously uncharacterized viruses within the yellow fever virus (YFV), Spondweni virus (SPOV) and dengue virus (DENV) groups. Two major phylogenetic lineages were revealed: one included the YFV and Entebbe bat virus groups, and the other included the DENV, SPOV and -borne flavivirus groups. This analysis supported previous evidence that -borne flaviviruses have evolved from ancestral -borne viruses. However, the topology at the junction between these lineages remains complex and may be refined by the discovery of viruses related to the Kedougou virus. Additionally, viral evolution was found to be associated with the appearance of new biological characteristics; mutations that may modify the envelope protein structure were identified for seven viruses within the YFV group, and an expansion of host–vector range was identified in the two major evolutionary lineages, which in turn may facilitate the emergence of mosquito-borne flaviviruses.


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vol. , part 1, pp. 87 - 94

Disulfide bridges in the flavivirus envelope glycoprotein



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