Evaluation of Stress and Depression in Adolescents and Their Underlying Genetic Basis: A Comprehensive Study
DOI:
https://doi.org/10.53032/tvcr/2020.v2n2.03Keywords:
adolescent depression, stress evaluation, genetic basis, GWAS, SLC6A4, BDNF, FKBP5, HPA axis, epigenetics, polygenic risk score, 5-HTTLPR, gene-environment interaction, CDI, PHQ-A, neuroimaging, heritabilityAbstract
In comparison to other phases of life, adolescence represents a crucial developmental window during which susceptibility to stress and depression is disproportionately increased. According to estimates, 4.4–5.8% of adolescents worldwide suffer from depressive disorders, which often start between the ages of 13 and 18. According to twin-based heritability estimates, the aetiology of adolescent stress and depression is multifactorial, resulting from the intricate interaction of neurobiological maturation, psychosocial stressors, hormonal transitions, and a significant genetic substrate that explains 40–65% of phenotypic variance in depression liability. The paper provides a thorough explanation of how stress and depression are assessed in teenage populations and how genetic variables influence their development by synthesising data from clinical epidemiology, psychometric testing, neuroimaging, molecular genetics, and epigenomics. The principal assessment tools employed in adolescent mental health evaluation; including the Children's Depression Inventory (CDI), Beck Depression Inventory (BDI), Patient Health Questionnaire for Adolescents (PHQ-A), Perceived Stress Scale (PSS), and Childhood Trauma Questionnaire (CTQ); are reviewed with respect to their psychometric properties and clinical utility. Neurobiological frameworks are examined, including dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis, prefrontal-limbic circuit imbalance, and inflammatory cytokine signaling. The genetic architecture of adolescent depression is analyzed through genome-wide association studies (GWAS), candidate gene research, and polygenic risk score approaches, with principal genetic contributors including variants in SLC6A4 (serotonin transporter), BDNF (brain-derived neurotrophic factor), FKBP5 (FK506-binding protein), CRHR1 (corticotropin-releasing hormone receptor 1), and COMT (catechol-O-methyltransferase). Gene-environment interaction mechanisms; particularly serotonin transporter-linked polymorphic region (5-HTTLPR) moderation of stress responsivity; and epigenetic modifications including stress-induced DNA methylation changes at NR3C1 and FKBP5 loci are discussed. The review concludes by identifying critical gaps in research and priorities for integrating genetic risk stratification into clinical adolescent mental health practice.
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