Impact of novel TRIM5α variants, Gly110Arg and G176del, on the anti-HIV-1 activity and the susceptibility to HIV-1 infection

Objective: TRIM5 alpha is one of the factors contributing to intracellular defense mechanisms against HIV-1 infection. We investigated the association of TRIM5 alpha sequence variations with the susceptibility to HIV-1 infection in Japanese and Indian. Design: Sequence variations in TRIM5 alpha were investigated in HIV-1-infected patients and ethnic-matched controls. Functional alterations caused by rare variants were analyzed. Methods: We sequenced TRIM5 alpha-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 TRIM5a, whereas the truncated G176del-TRIM5 enhanced the antiviral activity of coexpressed TRIM5a. 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 TRIM5a are associated with the susceptibility to HIV-1 infection. (C) 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins