Background Results from genome-wide association studies (GWAS) identified many loci and
Background Results from genome-wide association studies (GWAS) identified many loci and biological pathways that influence adult body mass index (BMI). childhood BMI, total fat mass, android/gynoid fat ratio, and preperitoneal fat area (all axis represents the categories of the risk score (overall buy 517-28-2 sum of risk alleles, weighted by previously reported effect estimates, rescaled … General and abdominal adiposity at school-age The overall adult BMI genetic risk score was associated with all childhood general and abdominal adiposity measures. For each SD increase in the genetic risk score, childhood BMI increased by 0.112 SDS (95?% CI 0.084, 0.141), total fat mass increased by 0.092 SDS (95?% CI 0.065, 0.119), android/gynoid fat ratio increased by 0.077 SDS (95?% CI 0.045, 0.108), and increased preperitoneal fat area by 0.034 SDS (95?% CI 0.001, 0.066) (Table?3; Fig.?2a-d). Effect estimates for the buy 517-28-2 unweighted and weighted 97 adult BMI SNPs risk scores were similar (Additional file 5: Table S4). Addition of PWV to the regression models did not materially change the effect estimates for the association of the BMI risk scores with BMI, total fat mass percentage, and android/gynoid fat ratio. However, the effect estimate for the association of the adult BMI risk score with childhood preperitoneal fat area was no longer significant. We observed similar findings when we added BMIAP instead of PWV to these regression models. However, the effects on the associations of the BMI risk scores with BMI and total fat mass were somewhat larger. Effect estimates for the associations of the child BMI risk score with BMI and total fat mass were 10C15?% lower after additional adjustment for PWV. Effect estimates for android/gynoid fat ratio and preperitoneal fat area did not materially change. We observed similar findings after additional adjustment for BMIAP (Additional file 10: Table S7 and Additional file 11: Table S8). Table 3 Associations of BMI, WHR, and childhood BMI genetic risk scores with childhood adiposity (axis represents the categories of the risk score (overall sum of risk alleles, weighted by previous reported effect estimates, … Of the 28 adult BMI genetic risk scores based on the biological pathways, those based on neuronal developmental processes, hypothalamic expression and regulation, WNT-signaling, membrane proteins, monogenic obesity/energy homeostasis, glucose homeostasis/diabetes, and muscle biology were associated with childhood BMI (all p-values <0.0018). Genetic risk scores based on hypothalamic expression and regulation, cyclicAMP, monogenic obesity/energy homeostasis, and cell cycle were associated with total fat mass, whereas for android/gynoid fat buy 517-28-2 ratio only the genetic risk scores based on hypothalamic expression and regulation, membrane proteins, and monogenic obesity/energy homeostasis show significant associations (all p-values <0.0018). None of the pathways were associated with preperitoneal fat area (Table?3). We based our pathway risk scores on these biological categories to keep our analysis Nedd4l as close as possible to the analysis of the original paper as possible . As?a comparison, we also ran a pathway analysis using IPA. Results were comparable regarding the major categories (eg. neurological development and function, cell cycle, lipid metabolism, apoptosis). However, the IPA software showed a larger subdivision with 74 different pathways instead of 28 as suggested by the GIANT consortium (Additional file 12, Table S9). The overall adult WHR genetic risk score was only associated with android/gynoid fat ratio (Table?3; Additional file 13: Figure S4a-d). The childhood BMI genetic risk score was associated with all childhood adiposity measures (Table?3; Additional file 14: Figure S5a-d). The genetic risk score based on 29 SNPs showed higher effect estimates per SD increase than our 97 SNPs adult BMI risk score for the childhood adiposity outcomes, especially for preperitoneal fat area (Additional file 8, Table S5). The 97 adult BMI SNPs explained 4.9?% of childhood BMI when added into our model as individual SNPs. When the 97 SNPs were combined into the weighted risk score and added to our model, the risk score explained 1.4?% of childhood BMI (Additional file 15: Table S10). Discussion We observed that a higher overall adult BMI genetic risk score based on 97 SNPs was associated with BMIAP during infancy, and with BMI, total fat mass, android/gynoid fat ratio, and preperitoneal fat area during childhood. A genetic risk score based on SNPs in or close to genes in the.