【Genotypes at chromosome 22q12-13 are associated with HIV-1-exposed but uninfected status in Italians. 】 『AIDS.』 19(10):1015-1024, July 1, 2005. Kanari, Yasuyoshi a; Clerici, Mario b; Abe, Hiroyuki a; Kawabata, Hiroyuki a; Trabattoni, Daria b; Caputo, Sergio Lo c; Mazzotta, Francesco c; Fujisawa, Hironori d; Niwa, Atsuko a; Ishihara, Chiaki e; Takei, Yumiko A f; Miyazawa, Masaaki a
Abstract: Objective: Despite multiple and repeated exposures to HIV-1, some individuals possess no detectable HIV genome and show T-cell memory responses to the viral antigens. HIV-1-reactive mucosal IgA detected in such uninfected individuals suggests their possible immune resistance against HIV. We tested if the above HIV-1-exposed but uninfected status was associated with genetic markers other than a homozygous deletion of the CCR5 gene.
Methods: Based on our mapping in chromosome 15 of a gene controlling the production of neutralizing antibodies in a mouse retrovirus infection, we genotyped 42 HIV-1-exposed but uninfected Italians at polymorphic loci in the syntenic segment of human chromosome 22, and compared them with 49 HIV-1-infected and 47 uninfected healthy control individuals by a closed testing procedure.
Results: A significant association was found between chromosome 22q12-13 genotypes and a putative dominant locus conferring anti-HIV-1 immune responses in the exposed but uninfected individuals. Distributions of linkage disequilibrium across chromosome 22 also differed between the exposed but uninfected and two other phenotypic groups.
Conclusions: The data indicated the presence of a new genetic factor associated with the HIV-1-exposed but uninfected status.