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AIDS Research and Human Retroviruses
|July 3, 2007
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Summary

This study analyzed 30 pol gene sequences of circulating recombinant form (CRF) 02_AG (IbNG). Findings confirm these sequences are true members of CRF02_AG-IbNG, a distinct subtype separate from A or G clades.

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Area of Science:

  • * Virology
  • * Molecular Biology
  • * Bioinformatics

Background:

  • * HIV-1 genetic diversity poses challenges for diagnostics and therapeutics.
  • * Circulating recombinant forms (CRFs) are significant in HIV-1 epidemiology.
  • * CRF 02_AG is a prevalent CRF in various regions, with specific subtypes like IbNG.

Purpose of the Study:

  • * To analyze the genomic composition of pol gene sequences from plasma-derived samples.
  • * To phylogenetically confirm subtype assignment of these sequences.
  • * To compare the genomic recombination patterns of identified strains with the CRF02_AG/IbNG prototype.

Main Methods:

  • * Phylogenetic analysis using C2-V3 region for subtype confirmation.
  • * Bootscanning and Jumping HMMER software (jpHMM) for genomic recombination analysis.
  • * Construction of phylogenetic subtrees for individual gene segments.

Main Results:

  • * Thirty pol gene sequences were identified as clustering with CRF 02_AG (IbNG).
  • * Phylogenetic analysis confirmed subtype assignment for 18/21 evaluated sequences.
  • * Bootscanning and jpHMM revealed that 27% and 50% of clinical sequences, respectively, shared the pol structure of the CRF02_A/G-IbNG prototype.
  • * jpHMM analysis of gene segments showed all fragments clustering with IbNG and distinct from A and G clades.

Conclusions:

  • * The analyzed sequences are confirmed as true members of CRF02_AG-IbNG.
  • * CRF02_AG-IbNG represents a phylogenetically distinct subtype, separate from A or G clades, particularly concerning the pol gene.