Characterization of HIV-1 CRF90_BF1 and putative novel CRFs_BF1 in central west, north and northeast Brazilian regions
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2017
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The Brazilian AIDS epidemic has been characterized by an increasing rate of BF1 recombi nants and so far eight circulating recombinant forms/CRFs_BF1 have been described coun trywide. In this study, pol sequences (protease/PR, reverse transcriptase/RT) of 87 BF1
mosaic isolates identified among 828 patients living in six Brazilian States from three geo graphic regions (Central West, North, Northeast) were analyzed. Phylogenetic and boot scan analyses were performed to investigate the evolutionary relationship and mosaic
structure of BF1 isolates. Those analyses showed that 20.7% of mosaics (18 out of 87)
were CRFs-like isolates, mostly represented by CRF28/CRF29_BF-like viruses (14 out of
18). We also identified five highly supported clusters that together comprise 42 out of 87
(48.3%) BF1 sequences, each cluster containing at least five sequences sharing a similar
mosaic structure, suggesting possible new unidentified CRFs_BF1. The divergence time of
these five potential new CRFs_BF1 clusters was estimated using a Bayesian approach and
indicate that they probably originated between the middle 1980s and the middle 1990s.
DNA was extracted from whole blood and four overlapping fragments were amplified by
PCR providing full/near full length genomes (FLG/NFLG) and partial genomes. Eleven HIV-
1 isolates from Cluster # 5 identified in epidemiologically unlinked individuals living in Central
West and North regions provided FLG/NFLG/partial genome sequences with identical
mosaic structure. These viruses differ from any known CRF_BF1 reported to date and were
named CRF90_BF1 by the Los Alamos National Laboratory. This is the 9th CRF_BF1
described in Brazil and the first one identified in Central West and North regions. Our results
highlight the importance of continued molecular screening and surveillance studies, espe cially of full genome sequences to understand the evolutionary dynamics of the HIV-1 epi demic in a country of continental dimensions as Brazil.
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REIS, Mônica Nogueira da Guarda et al. Characterization of HIV-1 CRF90_BF1 and putative novel CRFs_BF1 in central west, north and northeast Brazilian regions. Plos One, San Francisco, v. 12, n. 6, e0178578, 2017. DOI: 10.1371/journal.pone.0178578. Disponível em: https://pmc.ncbi.nlm.nih.gov/articles/PMC5476242/. Acesso em: 12 fev. 2025.