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Human immunodeficiency virus type 1 (HIV-1) is classified into different phylogenetic subtypes, with subtype C representing more than half of the novel infections globally. However, there are relatively few subtype C envelopes available for study. We amplified 18 unique env genes from 13 patients who were infected with subtype C HIV-1 in six African countries and in Scotland to create replication-competent viruses. These envelopes are phylogenetically diverse across the subtype C spectrum, and have on average more N-linked glycosylation sites and slightly longer variable loops than previously described C envelopes. We found that CCR3 coreceptor usage is less prevalent in subtype C than in subtype B viruses, and these envelopes have varied sensitivity to neutralization. The subtype C chimeric viruses generated in this study will be useful for evaluating the breadth of neutralizing antibodies and other entry inhibitors.
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Journal of General Virology vol. 91 , part 9, pp. 2374 - 2380
Supplementary Fig. S1. Amino acid sequence alignments
Supplementary Table S1. Patient data and virus clones
Supplementary Table S2. Primers used in subtype C Env cloning
Supplementary Table S3. PNLGS and the length of the variable loops
Supplementary Table S4A. CCR3 use by the Tier 2 clade B reference strain panel of gp160 clones
Supplementary Table S4B. CCR3 use by the Tier 2 African clade C reference strain panel of gp160 clones [Single PDF file](130 KB)