Impact of novel TRIM5alpha variants, Gly110Arg and G176del, on the anti-HIV-1 activity and the susceptibility to HIV-1 infection

AIDS. 2009 Oct 23;23(16):2091-100. doi: 10.1097/QAD.0b013e328331567a.


Objective: TRIM5alpha is one of the factors contributing to intracellular defense mechanisms against HIV-1 infection. We investigated the association of TRIM5alpha sequence variations with the susceptibility to HIV-1 infection in Japanese and Indian.

Design: Sequence variations in TRIM5alpha were investigated in HIV-1-infected patients and ethnic-matched controls. Functional alterations caused by rare variants were analyzed.

Methods: : We sequenced TRIM5alpha-exon 2 in both Japanese (94 HIV-1-infected patients and 487 controls) and Indian (101 HIV-1-infected patients and 99 controls). Frequency of variants and haplotypes were compared between the HIV-1-infected patients and controls. Functional analyses were performed for two rare variants, Gly110Arg and G176del.

Results: The frequency of 43Tyr-allele in the Indian HIV-1-infected patients was significantly lower than that in the ethnic-matched controls (odds ratio = 0.52, 95% confidence interval = 0.31-0.89, P = 0.015). A similar tendency was observed in Japanese sample, although it was not statistically significant (odds ratio = 0.67, 95% confidence interval = 0.43-1.05, P = 0.095). On the other hand, haplotype analyses revealed that the haplotype carrying the 43Tyr-allele was significantly associated with the reduced susceptibility to HIV-1 infection in both ethnic groups. Functional analysis revealed that Gly110Arg variant weakened the anti-HIV-1 and anti-HIV-2 activities of human TRIM5alpha, whereas the truncated G176del-TRIM5 enhanced the antiviral activity of coexpressed TRIM5alpha. Epidemiological data were consistent in that Gly110Arg and G176del were associated with the susceptibility to and protection from HIV-1 infection, respectively.

Conclusion: Both common and rare variants of TRIM5alpha are associated with the susceptibility to HIV-1 infection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antiviral Restriction Factors
  • Asians / genetics
  • Blotting, Western
  • CD4 Lymphocyte Count
  • CD4-Positive T-Lymphocytes / immunology*
  • Carrier Proteins / genetics*
  • Carrier Proteins / immunology
  • Case-Control Studies
  • Disease Progression
  • Female
  • Genetic Predisposition to Disease*
  • Genetic Variation
  • HIV Infections / ethnology
  • HIV Infections / genetics*
  • HIV Infections / immunology
  • HIV-1 / immunology*
  • Haplotypes
  • Humans
  • Male
  • Polymorphism, Single Nucleotide
  • Tripartite Motif Proteins
  • Ubiquitin-Protein Ligases


  • Antiviral Restriction Factors
  • Carrier Proteins
  • Tripartite Motif Proteins
  • TRIM5 protein, human
  • Ubiquitin-Protein Ligases