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Association of the Brain-derived Neurotrophic Factor Gene and Clinical Features of Bipolar Disorder in Korea.

 Hye Ji Min ; Hyun-Sang Cho ; Duk-In Jon ; Eun Lee ; Jeong-Ho Seok ; Se Joo Kim 
 Clinical Psychopharmacology and Neuroscience, Vol.10(3) : 163~167, 2012 
Journal Title
 Clinical Psychopharmacology and Neuroscience 
Issue Date
OBJECTIVE: Brain-derived neurotrophic factor (BDNF) plays an important role in cell survival, differentiation, and cell death as well as in neural plasticity. Recent studies have suggested that BDNF is involved in the pathogenesis of bipolar disorder. The aim of this study was to investigate the association of the genetic variations of the BDNF gene with bipolar disorder in Korea. We also studied the possible association of these genetic variants with clinical features. METHODS: The allelic and genotypic distributions of Val66Met polymorphism of the BDNF gene were analyzed using a polymerase chain reaction-based method in 184 bipolar patients and 214 controls. Analysis was performed to investigate an association of the Val66Met polymorphism of the BDNF gene and the clinical features in bipolar patients. RESULTS: No significant difference was found between bipolar patients and controls in the genotype and allele frequencies for the investigated BDNF polymorphism. However, the age of onset of bipolar disorder among the Val/Val (25.57), Val/Met (30.42) and Met/Met (32.45) genotype groups were significantly different (p=0.037). CONCLUSION: This study suggests that Val66Met polymorphisms are unlikely to contribution to the genetic predisposition to bipolar disorder as a whole. But Val66Met polymorphism may be associated with age of onset of the disorder, further studies designed to investigate the relationship in a larger population may be warranted.
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