Genetic risk score for common obesity and anthropometry in Spanish schoolchildren

IntroductionCommon or non-syndromic obesity is a complex polygenic trait conditioned by biallelic or single-base polymorphisms called SNPs (Single-Nucleotide Polymorphisms) that present an additive effect and act synergistically. Most genotype-obese phenotype association studies include body mass index (BMI) or waist-to-height ratio (WtHR), and very few introduce a broad anthropometric profile. ObjectiveTo verify whether a genetic risk score (GRS) developed from 10 SNPs is associated with the obesity phenotype assessed from anthropometric measures indicative of excess weight, adiposity and fat distribution. Material and methodsA series of 438 Spanish schoolchildren (6–16 years old) were evaluated anthropometrically (weight, height, waist circumference, skinfold thickness, BMI, WtHR, body fat percentage [%BF]). Ten SNPs were genotyped from saliva samples, generating a GRS for obesity, establishing genotype-phenotype association. ResultsSchoolchildren categorised as obese by BMI, ICT and %BF had higher GRS than their non-obese peers. The prevalence of overweight and adiposity was higher in subjects with a GRS above the median. Similarly, between 11 and 16 years of age, all anthropometric variables presented higher averages. ConclusionsGRS estimated from the 10 SNPs can be a diagnostic tool for the potential risk of obesity in Spanish schoolchildren and could be useful from the preventive perspective. IntroducciónLa obesidad común o no sindrómica es un rasgo poligénico complejo condicionado por polimorfismos bialélicos o de una sola base denominados single nucleotide polimorphisms (SNP) que presentan un efecto aditivo y que actúan sinérgicamente. La mayor parte de los estudios de asociación genotipo-fenotipo obeso incluyen índice de masa corporal (IMC) o índice cintura talla (ICT), siendo escasos los que introducen un amplio perfil antropométrico. ObjetivoComprobar si una puntuación de riesgo genético (PRG) desarrollada a partir de 10 SNP se encuentra asociada al fenotipo de obesidad evaluado a partir de medidas antropométricas indicativas de exceso ponderal, adiposidad y distribución de la grasa. Material y métodosUna serie de 438 escolares españoles (de 6 a 16 años) fueron evaluados antropométricamente (peso, talla, perímetro de la cintura, pliegues adiposos subcutáneos, IMC, ICT, porcentaje de grasa corporal [%GC]). Se genotiparon 10 SNP a partir de muestras de saliva que generaron una puntuación de riesgo genético de obesidad y establecieron asociación ge