Genetic characterization and phylogenetic analysis of HIV-1 subtype C fromUganda

To better understand the emergence of subtype C and its potential impact on vaccine efforts in Uganda, we have characterized subtype C sequences from Uganda (n = 13), Zimbabwe (n = 11), Mozambique (n = 5), South Africa (n = 4 ), and India (n = 3). Phylogenetic analysis of subtype C sequences in the e nv gp41 gene region revealed multiple subclusters within subtype C, Further , while most Ugandan specimen subclustered together, other subclusters did not reflect a clear geographic location. The nucleotide divergence within t he Ugandan subset was 8.2% (6.1-9.8%) compared with 9.5% (2.5-15%) for the other subtype C gp41 sequences. The protein sequence alignment revealed mar ked sequence conservation of major immunodominant epitopes within the gp41 region.