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  • Title: Serotonergic and BDNF genes and risk of depression after stroke.
    Author: Kim JM, Stewart R, Bae KY, Kim SW, Kang HJ, Shin IS, Kim JT, Park MS, Kim MK, Park SW, Kim YH, Kim JK, Cho KH, Yoon JS.
    Journal: J Affect Disord; 2012 Feb; 136(3):833-40. PubMed ID: 22014446.
    Abstract:
    BACKGROUND: Polymorphisms of serotonin transporter (5-HTT) and brain-derived neurotrophic factor (BDNF) have been investigated as candidate genes for post-stroke depression (PSD). Serotonin 2a receptor (5-HTR2a) genes have not been yet investigated in PSD. This study aimed to investigate whether the 5-HTT, 5-HTR2a, and BDNF genes are associated with PSD independently and/or interactively in a Korean sample with high prevalence of risk alleles. METHODS: In 276 stroke cases, depression was diagnosed using DSM-IV at 2 weeks after stroke, further classified to major PSD (N=29), all (major plus minor) PSD (N=77), and control (N=199) groups. Associations between PSD and 5-HTTLPR, STin2 VNTR, 5-HTR2a 1438A/G, 5-HTR2a 102T/C, and BDNF val66met genotypes were estimated using logistic regression models, and gene-gene interactions were investigated using the generalized multifactor dimensionality reduction method. RESULTS: 5-HTR2a 1438 A/A genotype was associated with major PSD, while 5-HTTLPR s/s and BDNF met/met genotypes were associated with all PSD. There was a significant interaction between 5-HTR2a 1438A/G and BDNF val66met polymorphisms for major PSD and a borderline significant interaction between 5-HTTLPR and BDNF val66met polymorphisms for all PSD. CONCLUSIONS: In a large cohort, we found evidence for serotonin and BDNF polymorphisms as susceptibility factors and gene-gene interactions between these systems for depression at 2 weeks post-stroke.
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