title: Polymorphism of Fc receptor IIa for IgG in infants is associated with susceptibility to perinatal HIV-1 infection.
abstract: OBJECTIVE
  To evaluate the effect of polymorphism of the Fc gamma receptor IIa, which is associated with differential human IgG subclass binding, on perinatal HIV-1 transmission.
  
  
  METHODS
  Fc gamma RIIa genotype was tested in 448 HIV-seropositive mothers and their infants from a cohort study designed to assess the effect of placental malaria on HIV vertical transmission conducted from 1996 to 2001 in western Kenya. Fc gamma RIIa polymorphism was analyzed for associations with susceptibility to perinatal HIV infection and all-cause child mortality in HIV-positive children.
  
  
  RESULTS
  Overall, 20% of infants were perinatally infected with HIV. There was no statistically significant association between maternal genotype and perinatal HIV-1 transmission. However, frequency of the infant Fc gamma RIIa His/His131 genotype was higher in HIV-positive compared with HIV-negative infants (35% and 21%, respectively), whereas the distribution was reversed (15% and 28%, respectively) for infants with the Fc gamma RIIa Arg/Arg131 genotype. Multivariate logistic regression controlling for maternal and infant confounding factors demonstrated that the odds of perinatal HIV infection in infants with the Fc gamma RIIa His/His131 versus Fc gamma RIIa His/Arg131 genotypes were significantly higher (adjusted odds ratio, 2.22; 95% confidence interval, 1.23-4.02; P = 0.009). There was no evidence for an association between HIV-positive child all-cause mortality and Fc gamma RIIa genotype.
  
  
  CONCLUSIONS
  This study provides the first evidence that the infant Fc gamma RIIa His/His131 genotype is associated with susceptibility to perinatal HIV-1 transmission and further suggests that there is a dose-response relationship for the effect of the Fc gamma RIIa His131 gene on transmission.
authors.affiliation: Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
authors.forename: Kimberly C
authors.initials: KC
authors.lastname: Brouwer
authors.forename: Renu B
authors.initials: RB
authors.lastname: Lal
authors.forename: Lisa B
authors.initials: LB
authors.lastname: Mirel
authors.forename: Chunfu
authors.initials: C
authors.lastname: Yang
authors.forename: Anne M
authors.initials: AM
authors.lastname: van Eijk
authors.forename: John
authors.initials: J
authors.lastname: Ayisi
authors.forename: Juliana
authors.initials: J
authors.lastname: Otieno
authors.forename: Bernard L
authors.initials: BL
authors.lastname: Nahlen
authors.forename: Richard
authors.initials: R
authors.lastname: Steketee
authors.forename: Altaf A
authors.initials: AA
authors.lastname: Lal
authors.forename: Ya Ping
authors.initials: YP
authors.lastname: Shi
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D015658:HIV Infections / Q000151:congenital / Q000235:genetics* / Q000635:transmission; D015497:HIV-1 / Q000235:genetics*; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D018445:Infectious Disease Transmission, Vertical; D011110:Polymorphism, Genetic / Q000235:genetics*; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious; D017452:Receptors, IgG / Q000235:genetics*; D012044:Regression Analysis
chemical_list: D015703:Antigens, CD; C080568:Fc gamma receptor IIA; D017452:Receptors, IgG