1385-P: Maternal Gestational Weight Gain and Children’s Genetic Susceptibility on Childhood Adiposity—A Longitudinal Cohort Study

Abstract

Few studies have assessed the association of early-life environmental and genetic factors with the risk of childhood adiposity. The aim of the present study was to investigate the interaction between maternal gestational weight gain (GWG) and children’s genetic susceptibility on childhood adiposity. The present study included 1038 mother-child pairs. Body mass index (BMI) for age Z-score (BMI-Z) and childhood overweight were evaluated according to the World Health Organization (WHO) growth reference. Genetic risk score (GRS) was established by aggregating alleles of 10 BMI susceptibility single-nucleotide polymorphisms identified from a recent study. Children born to mothers with excessive GWG had higher BMI-Z (P<0.001), percentage of body fat (P<0.001), and prevalence of overweight (28.4% vs 15.9%, P<0.001) than those born to mothers with adequate GWG. Children’s BMI GRS was significantly and positively associated with BMI-Z, percentage of body fat and overweight risk (all P<0.05). Stratified analyses showed the positive association of children’s BMI GRS with adiposity risk was especially concentrated among mothers with pre-pregnancy normal weight but excessive GWG. The present study identified an interactive effect between maternal GWG and children’s genetic susceptibility on childhood adiposity risk. The findings provided new insight into the etiology of childhood obesity and highlighted the importance of GWG management. Disclosure H.Liu: None. W.Li: None. L.Wang: None. S.Zhang: None. W.Li: None. X.Yang: None. J.Leng: None. G.Hu: None. S.Wang: None. Funding European Foundation for the Study of Diabetes/Chinese Diabetes Society/Lilly Programme for Collaborative Research between China and Europe; National Institute of Diabetes and Digestive and Kidney Diseases (R01DK100790, R01DK132011); National Institute of General Medical Sciences (U54GM104940)