Developmental pathways to adiposity begin before birth and are influenced by genotype, prenatal environment and epigenome.

TitleDevelopmental pathways to adiposity begin before birth and are influenced by genotype, prenatal environment and epigenome.
Publication TypeJournal Article
Year of Publication2017
AuthorsLin X, Lim IYubin, Wu Y, Teh ALing, Chen L, Aris IM, Soh SE, Tint MThway, MacIsaac JL, Morin AM, Yap F, Tan KHian, Saw SMei, Kobor MS, Meaney MJ, Godfrey KM, Chong YSeng, Holbrook JD, Lee YSeng, Gluckman PD, Karnani N
Corporate Authorsgroup Gstudy
JournalBMC Med
Volume15
Issue1
Pagination50
Date Published2017 Mar 07
ISSN1741-7015
Abstract

BACKGROUND: Obesity is an escalating health problem worldwide, and hence the causes underlying its development are of primary importance to public health. There is growing evidence that suboptimal intrauterine environment can perturb the metabolic programing of the growing fetus, thereby increasing the risk of developing obesity in later life. However, the link between early exposures in the womb, genetic susceptibility, and perturbed epigenome on metabolic health is not well understood. In this study, we shed more light on this aspect by performing a comprehensive analysis on the effects of variation in prenatal environment, neonatal methylome, and genotype on birth weight and adiposity in early childhood.METHODS: In a prospective mother-offspring cohort (N = 987), we interrogated the effects of 30 variables that influence the prenatal environment, umbilical cord DNA methylation, and genotype on offspring weight and adiposity, over the period from birth to 48 months. This is an interim analysis on an ongoing cohort study.RESULTS: Eleven of 30 prenatal environments, including maternal adiposity, smoking, blood glucose and plasma unsaturated fatty acid levels, were associated with birth weight. Polygenic risk scores derived from genetic association studies on adult adiposity were also associated with birth weight and child adiposity, indicating an overlap between the genetic pathways influencing metabolic health in early and later life. Neonatal methylation markers from seven gene loci (ANK3, CDKN2B, CACNA1G, IGDCC4, P4HA3, ZNF423 and MIRLET7BHG) were significantly associated with birth weight, with a subset of these in genes previously implicated in metabolic pathways in humans and in animal models. Methylation levels at three of seven birth weight-linked loci showed significant association with prenatal environment, but none were affected by polygenic risk score. Six of these birth weight-linked loci continued to show a longitudinal association with offspring size and/or adiposity in early childhood.CONCLUSIONS: This study provides further evidence that developmental pathways to adiposity begin before birth and are influenced by environmental, genetic and epigenetic factors. These pathways can have a lasting effect on offspring size, adiposity and future metabolic outcomes, and offer new opportunities for risk stratification and prevention of obesity.CLINICAL TRIAL REGISTRATION: This birth cohort is a prospective observational study, designed to study the developmental origins of health and disease, and was retrospectively registered on 1 July 2010 under the identifier NCT01174875 .

DOI10.1186/s12916-017-0800-1
Alternate JournalBMC Med
PubMed ID28264723
PubMed Central IDPMC5340003

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