Polymorphisms of genes involved in innate immunity: association with preterm delivery.
An altered inflammatory activity due to functionally relevant polymorphisms of the innate immune system may influence pathways leading to labour and, therefore, impact on the frequency of preterm birth. We examined five polymorphisms of the innate immune system in a large cohort of preterm very-low-birth-weight (VLBW, n = 909) and term-born infants (n = 491) and their mothers (n = 747). The primary outcome was preterm versus term birth. Frequencies of polymorphisms in mothers of term-born infants versus mothers of VLBW infants and term infants versus preterm VLBW infants (singletons) are given. Homozygous CD14-159T: 18.5 versus 21.8% (mothers) and 19.6 versus 21.2% (infants). Homozygous interleukin IL-6-174G: 28.8 versus 38% (P = 0.018, mothers) and 30 versus 32.7% (infants). Homozygous or heterozygous nuclear oligomerization domain NOD2-3020insC: 6.9 versus 6.1% (mothers) and 5.7 versus 5.1% (infants). Heterozygous or homozygous toll-like-receptor TLR2-Arg753Gln: 6.9 versus 6.1% (mothers) and 5.7 versus 5.1% (infants). Homozygous or heterozygous TLR4-896G: 8.1 versus 11.5% (mothers) and 11.6 versus 10.5% (infants). Although the homozygous maternal IL-6-174G genotype was found to be independently associated with preterm delivery in multivariate regression analysis, the incidence of intrauterine infection was not significantly increased in mothers of preterm VLBW-infants, carrying this or other polymorphisms of the innate immune system. The overall influence of the investigated polymorphisms on the development of preterm delivery seems moderate, since only the maternal IL6-174G genotype was associated with preterm birth and none of the polymorphisms were associated with intrauterine infection as the cause of preterm birth.
Härtel
Ch
Ch
Department of Pediatrics, University of Luebeck, Germany.
Finas
D
D
Ahrens
P
P
Kattner
E
E
Schaible
Th
T
Müller
D
D
Segerer
H
H
Albrecht
K
K
Möller
J
J
Diedrich
K
K
Göpel
W
W
D000328:Adult; D000483:Alleles; D005260:Female; D005787:Gene Frequency; D006720:Homozygote; D006801:Humans; D007113:Immunity, Innate / Q000235:genetics*; D007223:Infant; D015850:Interleukin-6 / Q000235:genetics; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics; D018950:Lipopolysaccharide Receptors / Q000235:genetics; D008562:Membrane Glycoproteins / Q000235:genetics; D053473:Nod2 Signaling Adaptor Protein; D011110:Polymorphism, Genetic; D011247:Pregnancy; D047928:Premature Birth / Q000235:genetics*; D011956:Receptors, Cell Surface / Q000235:genetics; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors
D015850:Interleukin-6; D047908:Intracellular Signaling Peptides and Proteins; D018950:Lipopolysaccharide Receptors; D008562:Membrane Glycoproteins; C429018:NOD2 protein, human; D053473:Nod2 Signaling Adaptor Protein; D011956:Receptors, Cell Surface; C495342:TLR2 protein, human; C495345:TLR4 protein, human; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors