Performance of genotypic tools for prediction of tropism in HIV-1 subtype C V3 loop sequences

Soham Gupta, Ujjwal Neogi, Hiresave Srinivasa, Anita Shet

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Currently, there is no consensus on the genotypic tools to be used for tropism analysis in HIV-1 subtype C strains. Thus, the aim of the study was to evaluate the performance of the different V3 loop-based genotypic algorithms available. We compiled a dataset of 645 HIV-1 subtype C V3 loop sequences of known coreceptor phenotypes (531 R5-tropic/non-syncytium-inducing and 114 X4-tropic/R5X4-tropic/syncytium-inducing sequences) from the Los Alamos database ( and previously published literature. Coreceptor usage was predicted based on this dataset using different software-based machine-learning algorithms as well as simple classical rules. All the sophisticated machine-learning methods showed a good concordance of above 85%. Geno2Pheno (false-positive rate cutoff of 5-15%) and CoRSeqV3-C were found to have a high predicting capability in determining both HIV-1 subtype C X4-tropic and R5-tropic strains. The current sophisticated genotypic tropism tools based on V3 loop perform well for tropism prediction in HIV-1 subtype C strains and can be used in clinical settings.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
Issue number1
StatePublished - Mar 6 2015
Externally publishedYes


  • Genotypic tropism testing
  • HIV-1 subtype C
  • Phenotype
  • R5-tropic
  • V3 loop
  • X4-tropic

ASJC Scopus subject areas

  • Virology
  • Infectious Diseases


Dive into the research topics of 'Performance of genotypic tools for prediction of tropism in HIV-1 subtype C V3 loop sequences'. Together they form a unique fingerprint.

Cite this