Genetic variation in the 15q25 nicotinic acetylcholine receptor gene cluster ( CHRNA5–CHRNA3–CHRNB4 ) interacts with maternal self-reported smoking status during pregnancy to influence birth weight

Author： Tyrrell Jessica Huikari Ville Christie Jennifer T. Cavadino Alana Bakker Rachel Brion Marie-Jo A. Geller Frank Paternoster Lavinia Myhre Ronny Potter Catherine Johnson Paul C.D. Ebrahim Shah Feenstra Bjarke Hartikainen Anna-Liisa Hattersley Andrew T. Hofman Albert Kaakinen Marika Lowe Lynn P. Magnus Per McConnachie Alex Melbye Mads Ng Jane W.Y. Nohr Ellen A. Power Chris Ring Susan M. Sebert Sylvain P. Sengpiel Verena Taal H. Rob Watt Graham C.M. Sattar Naveed Relton Caroline L. Jacobsson Bo Frayling Timothy M. Sørensen Thorkild I.A. Murray Jeffrey C. Lawlor Debbie A. Pennell Craig E. Jaddoe Vincent W.V. Hypponen Elina Lowe William L. Jarvelin Marjo-Riitta Davey Smith George Freathy Rachel M.

Publisher： Oxford University Press

ISSN： 1460-2083

Source： Human Molecular Genetics, Vol.21, Iss.24, 2012-12, pp. : 5344-5358

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Abstract

Maternal smoking during pregnancy is associated with low birth weight. Common variation at rs1051730 is robustly associated with smoking quantity and was recently shown to influence smoking cessation during pregnancy, but its influence on birth weight is not clear. We aimed to investigate the association between this variant and birth weight of term, singleton offspring in a well-powered meta-analysis. We stratified 26 241 European origin study participants by smoking status (women who smoked during pregnancy versus women who did not smoke during pregnancy) and, in each stratum, analysed the association between maternal rs1051730 genotype and offspring birth weight. There was evidence of interaction between genotype and smoking (P = 0.007). In women who smoked during pregnancy, each additional smoking-related T-allele was associated with a 20 g [95% confidence interval (95% CI): 4–36 g] lower birth weight (P = 0.014). However, in women who did not smoke during pregnancy, the effect size estimate was 5 g per T-allele (95% CI: −4 to 14 g; P = 0.268). To conclude, smoking status during pregnancy modifies the association between maternal rs1051730 genotype and offspring birth weight. This strengthens the evidence that smoking during pregnancy is causally related to lower offspring birth weight and suggests that population interventions that effectively reduce smoking in pregnant women would result in a reduced prevalence of low birth weight.