Polymorphism of Fc receptor IIa for IgG in infants is associated with susceptibility to perinatal HIV-1 infection.
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.
Brouwer
Kimberly C
KC
Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
Lal
Renu B
RB
Mirel
Lisa B
LB
Yang
Chunfu
C
van Eijk
Anne M
AM
Ayisi
John
J
Otieno
Juliana
J
Nahlen
Bernard L
BL
Steketee
Richard
R
Lal
Altaf A
AA
Shi
Ya Ping
YP
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
D015703:Antigens, CD; C080568:Fc gamma receptor IIA; D017452:Receptors, IgG