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Updated: Jul 11, 2026

Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3
11:10

Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3

Published on: December 28, 2010

A haplotype of the human CXCR1 gene protective against rapid disease progression in HIV-1+ patients

A Vasilescu1, Y Terashima, M Enomoto

  • 1Centre National de Génotypage, 91057 Evry, France.

Proceedings of the National Academy of Sciences of the United States of America
|March 16, 2007
PubMed

Insights

A specific CXCR1 gene variation (CXCR1-Ha) reduces CD4 and CXCR4 expression, lowering HIV-1 infection rates. This genetic factor appears protective against rapid AIDS progression.

Area of Science:

  • Immunology
  • Genetics
  • Virology

Background:

  • Chemokines and their receptors, particularly IL-8 receptors CXCR1 and CXCR2, are implicated in AIDS pathogenesis.
  • Genetic variations in the CXCR1-CXCR2 locus may influence AIDS progression.

Purpose of the Study:

  • To investigate the functional and clinical significance of a specific CXCR1 gene haplotype (CXCR1-Ha) in the context of HIV-1 infection and AIDS progression.

Main Methods:

  • Identified a CXCR1 haplotype (CXCR1-Ha) with two nonsynonymous SNPs.
  • Conducted transfection experiments to assess CD4 and CXCR4 expression and HIV-1 infection efficiency in cells with CXCR1-Ha.
  • Performed genetic association studies in an HIV-1(+) patient cohort.

Main Results:

  • CXCR1-Ha reduced CD4 and CXCR4 expression in various human cell lines.
  • Cells expressing CXCR1-Ha showed significantly lower susceptibility to HIV-1 infection.
  • The CXCR1-Ha allele was less frequent in rapid AIDS progressors compared to slow progressors (P = 0.0003).

Conclusions:

  • The CXCR1-Ha allele demonstrates a protective role against rapid AIDS progression.
  • This protection is likely mediated by the modulation of CD4 and CXCR4 expression, affecting HIV-1 infectivity.

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