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Oxford University Press (OUP), Human Molecular Genetics, 24(21), p. 5344-5358

DOI: 10.1093/hmg/dds372

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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

Journal article published in 2012 by Jessica Tyrrell, Ville Huikari, Jennifer T. Christie, Alana Cavadino, Rachel Bakker, Marie-Jo A. Brion, Frank Geller, Lavinia Paternoster ORCID, Ronny Myhre, Catherine Potter, Paul C. D. Johnson, Shah Ebrahim, Bjarke Feenstra, Anna-Liisa Hartikainen, Andrew T. Hattersley and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.