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Molecular differentiation of schizoaffective disorder from schizophrenia using BDNF haplotypes

Center for Translational Psychiatry, Feinstein Institute for Medical Research and Division of Psychiatry Research, The Zucker Hillside Hospital, New York

Robert H. Lipsky, PhD

Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, Bethesda

Pamela DeRosse, PhD

Division of Psychiatry Research, The Zucker Hillside Hospital

Katherine E. Burdick, PhD

Center for Translational Psychiatry, Feinstein Institute for Medical Research and Division of Psychiatry Research, The Zucker Hillside Hospital, New York

John M. Kane, MD

Center for Translational Psychiatry, Feinstein Institute for Medical Research and Department of Psychiatry, The Zucker Hillside Hospital

Anil K. Malhotra, MD

Center for Translational Psychiatry, Feinstein Institute for Medical Research and Division of Psychiatry Research, The Zucker Hillside Hospital, New York, USA.

Correspondence: Correspondence: Todd Lencz, The Zucker Hillside Hospital, Psychiatry Research, 75–59 263rd Street, Glen Oaks, New York 11004, USA. Email: lencz{at}lij.edu

Declaration of interest

None.

Background

Allelic variation in the gene encoding brain-derived neurotrophic factor (BDNF) has been associated with affective disorders, but generally not schizophrenia. Brain-derived neurotrophic factor variants may help clarify the status of schizoaffective disorder.

Aims

To test the hypothesis that BDNF haplotypes are associated with psychiatric illness marked by a prominent affective component.

Method

Frequencies of a 5-marker BDNF haplotype were examined in 600 White participants across four diagnostic categories and healthy controls.

Results

Individuals with schizoaffective disorder and other affective disorders were significantly more likely to carry two copies of the most common BDNF haplotype (containing the valine allele of the Val66Met polymorphism) compared with healthy volunteers. Moreover, when compared with people with schizophrenia, individuals with schizoaffective disorder were significantly more likely to carry two copies of the common haplotype.

Conclusions

To our knowledge, this is the first candidate gene study to demonstrate association with schizoaffective disorder but not schizophrenia. Variation in the BDNF gene may be associated with the clinical phenotype of affective dysregulation across several DSM–IV diagnostic categories.

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