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Les 1, 2). The sequences clustered with different clades and circulating recombinant forms distributed throughout the phylogenetic trees (Table 2), consistent with the breadth of HIV-1 diversity previously described in Cameroon. CRF02_AG-like viruses dominated the clade distribution, infecting 50 of the 46 participants for which both genes were sequenced (Figure 2). Participants infected with vir
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Two samples for which only gag or nef was typed, these were classified as belonging to CRF11_cpx. Notably, despite subtypes B and C collectively accounting for approximately 75 infections worldwide [16], none of our sequences were classified as belonging to either of these clades. In 10/46 samples from which both nef and gag sequences were analysed, they were classified as belonging to different
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Cpx (4 each), and clades A, F, CRF01_AE and CRF36_cpx (2 each). In addition, 22 of the studied viruses apparently had nef and gag genes from viruses belonging to different clades, with the majority (8/10) having either a nef or gag gene derived from CRF02_AG. Interestingly, five gag sequences (10 ) and three (5 ) nef sequences were neither obviously recombinant nor easily classifiable into any
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Replicates following removal of recombinant sequence fragments by a blinded fully exploratory screen for recombination using RDP3. Black squares at the end of the branches represent the gag and nef sequences sampled from Cameroon in this study, while red squares represent intragene recombinant fragments in our samples. The gag tree was rooted using HIV-1 group N, O, P and SIV CPZ isolates, while t
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F known clades. Although the majority of the outlier viruses found in our study were also URFs, they remained outliers after the removal of recombinant segments. It thus appears that these sequences represent viruses that are genuinely highly divergent and are possibly extant descendants of previously unknown early divergingTable 3 Inter and intraclade recombinantsSample ID BS02 BS09 BS11 BS13 BS2
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Harp PM, Hahn BH: Origins of HIV and the AIDS Pandemic. Cold Spring Harb Perspect Med 2011, 1:a006841. 3. Brennan CA, Bodelle P, Coffey R, Devare SG, Golden A, Harris B, Holzmayer V, Luk KC, Schochetman G, Swanson P, Yamaguchi J, Vallari A, Ndembi N, Ngansop C, Makamche F, Mbanya D, Gurtler LG, Zekeng L, Kaptue L, Hackett J Jr: The prevalence of diverse HIV-1 strains was stable in Cameroonian bloo
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Duced CD55 promotes T-cell proliferation and Th1 cytokine expression. In addition to C3 production, APCs cleave C3 leading to autocrine and paracrine C3R signaling. C3R signaling promotes MHC class II expression, IL-12 production and B7 co-stimulatory molecules. Dendritic cells that fail to express C3aR suffer reduced T-cell activation. Anaphylatoxins are well known initiators of inflammation but