Maternal KIR in combination with paternal HLA-C2 regulate human birth weight.
J Immunol
; 192(11): 5069-73, 2014 Jun 01.
Article
en En
| MEDLINE
| ID: mdl-24778445
ABSTRACT
Human birth weight is subject to stabilizing selection; babies born too small or too large are less likely to survive. Particular combinations of maternal/fetal immune system genes are associated with pregnancies where the babies are ≤ 5th birth weight centile, specifically an inhibitory maternal KIR AA genotype with a paternally derived fetal HLA-C2 ligand. We have now analyzed maternal KIR and fetal HLA-C combinations at the opposite end of the birth weight spectrum. Mother/baby pairs (n = 1316) were genotyped for maternal KIR as well as fetal and maternal HLA-C. Presence of a maternal-activating KIR2DS1 gene was associated with increased birth weight in linear or logistic regression analyses of all pregnancies >5th centile (p = 0.005, n = 1316). Effect of KIR2DS1 was most significant in pregnancies where its ligand, HLA-C2, was paternally but not maternally inherited by a fetus (p = 0.005, odds ratio = 2.65). Thus, maternal KIR are more frequently inhibitory with small babies but activating with big babies. At both extremes of birth weight, the KIR associations occur when their HLA-C2 ligand is paternally inherited by a fetus. We conclude that the two polymorphic immune gene systems, KIR and HLA-C, contribute to successful reproduction by maintaining birth weight between two extremes with a clear role for paternal HLA.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Peso al Nacer
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Antígenos HLA-C
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Receptores KIR
Límite:
Female
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Humans
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Male
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Newborn
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Pregnancy
Idioma:
En
Año:
2014
Tipo del documento:
Article