title: CCR5 genotypes in sexually active couples discordant for human immunodeficiency virus type 1 infection status.
abstract: Persons who are homozygous for the delta32 polymorphism of the CCR5 chemokine receptor gene are highly protected against human immunodeficiency virus type 1 (HIV-1) infection. Previous studies described 54 HIV-1-discordant couples in whom no virus transmission occurred despite extensive sexual contact. The possible role of the delta32 polymorphism in the lack of HIV-1 transmission between these partners was studied. No participants were homozygous for the delta32 allele, but the proportion that was heterozygous was higher among HIV-1-seronegative than HIV-1-seropositive partners (28% vs. 11%, P = .05). This association was seen in heterosexual couples (P = .03) but not in homosexual couples (P = .74). Among white persons, who are most likely to carry the delta32 allele, 38.9% of HIV-1-uninfected and 5.6% of HIV-1-infected heterosexual partners were heterozygous (P = .04). These data are consistent with a possible association between the heterozygous delta32 genotype in heterosexual sex partners and partial protection against HIV-1 infection, and they emphasize the importance of analyzing different risk groups in studies of host factors that influence infection.
authors.affiliation: Department of Pathology, University of Pennsylvania School of Medicine, Philadelphia 19104-6060, USA.
authors.forename: T L
authors.initials: TL
authors.lastname: Hoffman
authors.forename: R R
authors.initials: RR
authors.lastname: MacGregor
authors.forename: H
authors.initials: H
authors.lastname: Burger
authors.forename: R
authors.initials: R
authors.lastname: Mick
authors.forename: R W
authors.initials: RW
authors.lastname: Doms
authors.forename: R G
authors.initials: RG
authors.lastname: Collman
mesh_terms: D000483:Alleles; D005260:Female; D006580:Genetic Carrier Screening; D015658:HIV Infections / Q000235:genetics* / Q000635:transmission*; D018023:HIV Seronegativity; D006679:HIV Seropositivity; D015497:HIV-1; D006720:Homozygote; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D019713:Receptors, CCR5 / Q000235:genetics*; D012725:Sexual Behavior
chemical_list: D019713:Receptors, CCR5