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J Affect Disord. 2012 Feb;136(3):833-40. doi: 10.1016/j.jad.2011.09.029. Epub 2011 Oct 20.

Serotonergic and BDNF genes and risk of depression after stroke.

Author information

1
Department of Psychiatry, Chonnam National University Medical School, Gwangju 501-757, Republic of Korea. jmkim@chonnam.ac.kr

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.

PMID:
22014446
DOI:
10.1016/j.jad.2011.09.029
[Indexed for MEDLINE]

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