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Sökning: WFRF:(Kaasik Kadri)

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1.
  • Akkermann, Kirsti, et al. (författare)
  • The impact of adverse life events and the serotonin transporter gene promoter polymorphism on the development of eating disorder symptoms
  • 2012
  • Ingår i: Journal of Psychiatric Research. - : Elsevier BV. - 0022-3956 .- 1879-1379. ; 46:1, s. 38-43
  • Tidskriftsartikel (refereegranskat)abstract
    • Adverse life events have been shown to predict weight fluctuations and dietary restraint, as well as eating disorders during adolescence or early adulthood. Since the s-allele carriers of the 5-HTT gene-linked polymorphic region (5-HTTLPR) are biologically more reactive to stress related stimuli, we aimed to explore whether the eating disturbances are predicted by environmental stressors and moderated by the 5-HTTLPR genotype. The sample was based on the younger cohort of the Estonian Children Personality, Behaviour and Health Study and included those participating in its second and third wave. The history of stressful life events was self-reported at age 15. Data on eating behaviour and attitudes, anxiety, impulsivity and depressiveness were collected at age 18. The effect of the adverse life events on binge eating and on drive for thinness was found to be moderated by the 5-HTTLPR. Adolescent girls who at age 15 had reported a history of frequent adverse life events had elevated scores in EDI-2 Bulimia subscale at age 18 if they were carrying the s-allele. The effect of the s-allele on binge eating was even more pronounced when solely the experience of sexual abuse was considered. The interaction effect of the 5-HTTLPR and the past sexual abuse was also observed on drive, for thinness. These data give further support to the idea that adverse life events in childhood may heighten susceptibility to serotonergic dysregulation following stress, and suggest that in individuals vulnerable to eating disorders this may result in disturbed eating behaviours.
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2.
  • Smith, Jennifer A, et al. (författare)
  • Genome-wide association study identifies 74 loci associated with educational attainment
  • 2016
  • Ingår i: Nature (London). - : Springer Science and Business Media LLC. - 1476-4687 .- 0028-0836. ; 533:7604, s. 539-542
  • Tidskriftsartikel (refereegranskat)abstract
    • Educational attainment is strongly influenced by social and other environmental factors, but genetic factors are estimated to account for at least 20% of the variation across individuals. Here we report the results of a genome-wide association study (GWAS) for educational attainment that extends our earlier discovery sample of 101,069 individuals to 293,723 individuals, and a replication study in an independent sample of 111,349 individuals from the UK Biobank. We identify 74 genome-wide significant loci associated with the number of years of schooling completed. Single-nucleotide polymorphisms associated with educational attainment are disproportionately found in genomic regions regulating gene expression in the fetal brain. Candidate genes are preferentially expressed in neural tissue, especially during the prenatal period, and enriched for biological pathways involved in neural development. Our findings demonstrate that, even for a behavioural phenotype that is mostly environmentally determined, a well-powered GWAS identifies replicable associated genetic variants that suggest biologically relevant pathways. Because educational attainment is measured in large numbers of individuals, it will continue to be useful as a proxy phenotype in efforts to characterize the genetic influences of related phenotypes, including cognition and neuropsychiatric diseases.
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