Abstract
objective To investigate relationship between brain-derived neurotrophic factor (BDNF)gene Va166Met polymorphism and cognitive function in patients with major depressive disorder.Methods One hundred patients with major depressive disorder and 100 healthy volunteers were included.The cognitive function was assessed by a series of neuropsychology tests,and BDNF gene polymorphism was detected.Results (1)In control group,the achievements of all neuropsychology tests except for digit span were not significantly different among ones with different BDNF genotypes(P>0.05).(2)In patient group,the achievements of neuropsychology tests such as WAIS-RC(102.1±1 1.5 vs.92.5±10.2),M-WCST(5.6±1.7 vs.2.9±1.2,36.5±6.0 vs.26.8±5.6),TOH(50.8±9.6 vs.40.4±9.3),time for TMT-A and TMT-B,were significantly better in ones with Val/Val genotype than in ones with Met/Met genotype(P≤0.01).(3)The Val/Val genotype frequency in patients with better cognitive function was higher than that in patients with worse cognitive function,while Met/Met genotype frequency was in the opposite direction(P<0.05 or P<0.01).Conclusion The BDNF gene Va166Met polymorphism is possibly correlated with impairment of cognitive function in patients with major depressive disorder. Key words: Depression; Brain-derived neurotrophic factor; Genes; Polymorphism,restriction fragment length; Cognition
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