Polymorphism of Fc receptor IIa for immunoglobulin G is associated with placental malaria in HIV-1-positive women in western Kenya.
BACKGROUND
Genetic polymorphism of the Fc receptor IIa for immunoglobulin (Ig) G (Fc gamma RIIa) determines IgG subclass binding. Previous studies have shown that individuals with the IgG1/3-binding Fc gamma RIIa-Arg/Arg131 genotype are relatively protected against high-density malaria, whereas individuals with the IgG2-binding Fc gamma RIIa-His/His131 genotype are at increased risk for developing cerebral malaria. The present study was undertaken to examine the relationship between Fc gamma RIIa polymorphism and placental malaria (PM) in pregnant women of known human immunodeficiency virus (HIV)-1 status.


METHODS
Fc gamma RIIa genotype was determined in 903 pregnant women who had participated in a study designed to assess the effect that PM has on vertical transmission of HIV-1. Fc gamma RIIa polymorphism was assessed in relation to PM.


RESULTS
Among HIV-negative women, there was no difference in the distribution of the Fc gamma RIIa polymorphism by PM status. However, among HIV-positive women, the frequency of the Fc gamma RIIa-His/His131 genotype was significantly higher in women with PM than in women without PM (31% vs. 22%, respectively [P=.032]). In multivariate analysis, the adjusted odds ratio for PM in HIV-positive women with the Fc gamma RIIa-His/His131 genotype versus women in the Fc gamma RIIa-His/Arg131 reference group was 1.72 (95% confidence interval, 1.11-2.69 [P=.016]).


CONCLUSIONS
The present study suggests that the IgG2-binding Fc gamma RIIa-His/His131 genotype is associated with enhanced susceptibility to PM in HIV-positive women but not in HIV-negative women.
Division of Parasitic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 4770 Buford Highway, Chamblee, GA 30341, USA.
Kimberly C
KC
Brouwer
Altaf A
AA
Lal
Lisa B
LB
Mirel
Juliana
J
Otieno
John
J
Ayisi
Anne M
AM
Van Eijk
Renu B
RB
Lal
Richard
R
Steketee
Bernard L
BL
Nahlen
Ya Ping
YP
Shi
D000483:Alleles; D015703:Antigens, CD / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D015658:HIV Infections / Q000150:complications* / Q000453:epidemiology; D006801:Humans; D007630:Kenya / Q000453:epidemiology; D008288:Malaria / Q000150:complications* / Q000453:epidemiology; D010922:Placenta Diseases / Q000469:parasitology*; D011110:Polymorphism, Genetic; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious; D015597:Pregnancy Complications, Parasitic; D017452:Receptors, IgG / Q000235:genetics*
D015703:Antigens, CD; C080568:Fc gamma receptor IIA; D017452:Receptors, IgG