Phylogenetic analysis of 49 newly derived HIV-1 group O strains: high viral diversity but no group M-like subtype structure

Roques, P. et al. (2002) Phylogenetic analysis of 49 newly derived HIV-1 group O strains: high viral diversity but no group M-like subtype structure. Virology, 302(2), pp. 259-273. (doi:10.1006/viro.2002.1430) (PMID:12441070)

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We assess the genetic relationships between 49 HIV-1 group O strains from 24 and 25 patients living in Cameroon and France, respectively. Strains were sequenced in four genomic regions: gag (p24) and three env regions (C2-V3, gp41, and for 22 C2-gp41). In each of the genomic regions analyzed, the genetic diversity among the group O strains was higher than that exhibited by group M. We characterize three major group O phylogenetic clusters (O:A, O:B, and O:C) that comprised the same virus strains in each of the genomic regions analyzed. The majority of strains cluster in O:A, a cluster previously identified by analysis of pol and env sequences. Group O recombinants were also identified. Importantly, the distinction between these three major group O clades was weak compared to the strong clustering apparent in the global group M phylogenetic tree that led to the identification of subtypes. Thus, these clusters of group O viruses should not be considered as equivalent to the group M subtypes. This difference between the pattern of group O and the global group M diversity, both taking into account the pandemic status of the group M subtypes and the comparatively small number of group O-infected individuals (the majority being from Cameroon), indicates that the group O phylogeny primarily represents viral divergence in the Cameroon region, analogous to group M viral diversity present in the Democratic Republic of Congo.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Robertson, Professor David
Authors: Roques, P., Robertson, D.L., Souquière, S., Damond, F., Ayouba, A., Farfara, I., Depienne, C., Nerrienet, E., Dormont, D., Brun-Vézinet, F., Simon, F., and Mauclère, P.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Virology
ISSN (Online):1096-0341
Published Online:13 November 2002

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