The role of BDNF genetic polymorphisms in bipolar disorder with psychiatric comorbidities.

Journal of affective disorders

PubMedID: 21167606

Neves FS, Malloy-Diniz L, Romano-Silva MA, Campos SB, Miranda DM, De Marco L, Figueira PG, Krebs MO, Correa H. The role of BDNF genetic polymorphisms in bipolar disorder with psychiatric comorbidities. J Affect Disord. 2011;131(1-3):307-11.
BACKGROUND
Bipolar disorder (BD) is a complex disorder where genetic factors play a major role in its etiology. Probably, no other axis I diagnosis has a co-morbidity prevalence as high as BD. Since BDNF is involved in different ways in various psychiatric disorders we hypothesized that its genetic polymorphisms could be associated with the co-morbidity phenomenon in BD.

METHODS
We studied 320 subjects (160 BD patients and 160 healthy controls). Genotyping was performed using made-to-order TaqMan genotyping assays (rs4923463, rs6265, rs2049045, and rs7103411). Statistical analyses were performed using UNPHASED version 3.0.12 and Haploview 4.1.

RESULTS
No genotypic, allelic or haplotype differences were found between bipolar patients and healthy controls. Concerning exclusively the rs4923463 (G/G) there was a significant association with alcoholism (p=0.009), smoking (p=0.006) and violent suicide attempt (p=0.03). We further found that the G-G haplotype (rs4923463-rs2049045) (adjusted p=0.029) and the G-T haplotype (rs4923463-rs7103411) (adjusted p=0.029) were significantly more frequent in the group with alcoholism co-morbidity when compared with the group without this co-morbidity.

LIMITATIONS
Sample size and retrospective assessment of suicide behavior and psychiatric comorbidities.

CONCLUSIONS
The results obtained in our study indicate that BDNF variants may confer susceptibility to additional psychiatric diagnosis in BD.