title: Validation of obesity susceptibility loci identified by genome-wide association studies in early childhood in South Brazilian children.
abstract: The prevalence of childhood obesity has been dramatically increasing in developing countries as it has been reported for developed nations. Identifying susceptibility genes in early life could provide the foundations for interventions in lifestyle to prevent obese children to become obese adults.
  
  
  
  The objective of this study was to evaluate the influence of genetic variants related to obesity identified by genome-wide association studies (MC4R, TMEM18, KCTD15, SH2B1, SEC16B, BDNF, NEGR1, OLFM4 and HOXB5 genes) on anthropometric and dietary phenotypes in two Brazilian cohorts followed-up since birth.
  
  
  
  There were 745 children examined at birth, after 1 year and after 3.5 years of follow-up. Ten single nucleotide polymorphisms were genotyped. Anthropometric and dietary parameters were compared among genotypes. Children were classified as overweight when body mass index Z-score was >+1.
  
  
  
  Overweight prevalence was 30.7% at 3.5 years old. Significant associations were identified at 3.5 years old for TMEM18 rs6548238, NEGR1 rs2815752, BDNF rs10767664 and rs6265 (1 year old and 3.5 years old) with anthropometric phenotypes and at 3.5 years old for SEC16B rs10913469 with dietary parameters.
  
  
  
  Our results indicate that genetic variants in/near these genes contribute to obesity susceptibility in childhood and highlight the age at which they begin to affect obesity-related phenotypes.
authors.affiliation: Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.
authors.forename: M R
authors.initials: MR
authors.lastname: Zandoná
authors.affiliation: Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.|Nutrition Research Group (NUPEN), Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.
authors.forename: C N
authors.initials: CN
authors.lastname: Sangalli
authors.affiliation: Department of Nutrition, Vale do Rio do Sinos University, São Leopoldo, RS, Brazil.
authors.forename: P D B
authors.initials: PD
authors.lastname: Campagnolo
authors.affiliation: Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.|Nutrition Research Group (NUPEN), Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.
authors.forename: M R
authors.initials: MR
authors.lastname: Vitolo
authors.affiliation: Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.
authors.forename: S
authors.initials: S
authors.lastname: Almeida
authors.affiliation: Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.
authors.forename: V S
authors.initials: VS
authors.lastname: Mattevi
mesh_terms: D000328:Adult; D015992:Body Mass Index; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D001938:Brazil; D015816:Cell Adhesion Molecules, Neuronal / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D058851:GPI-Linked Proteins / Q000235:genetics; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D055106:Genome-Wide Association Study; D005838:Genotype; D006801:Humans; D007223:Infant; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D050177:Overweight / Q000453:epidemiology / Q000235:genetics*; D063766:Pediatric Obesity / Q000453:epidemiology / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D015816:Cell Adhesion Molecules, Neuronal; D004268:DNA-Binding Proteins; D058851:GPI-Linked Proteins; D008565:Membrane Proteins; C485559:NEGR1 protein, human; C443860:SEC16B protein, human; C530715:TMEM18 protein, human; C579455:BDNF protein, human
keywords: Children; energy intake; genetic susceptibility; overweight