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Circadian clock gene rhythms in brain altered in depression, UC Irvine Health study finds
Date:5/13/2013

UC Irvine Health researchers have helped discover that genes controlling circadian clock rhythms are profoundly altered in the brains of people with severe depression. These clock genes regulate 24-hour circadian rhythms affecting hormonal, body temperature, sleep and behavioral patterns.

Depression is a serious disorder with a high risk for suicide affecting approximately one in 10 Americans, according to the Centers for Disease Control, and is ranked as fourth of all diseases by the World Health Organization in terms of lifetime disability. Study findings provide the first evidence of altered circadian gene rhythms in brain tissue of people with depression and suggest a physical basis for many of the symptoms that depressed patients report.

The study which appears online this week in the Proceedings of the National Academy of Sciences involved researchers from UC Irvine Health, University of Michigan, UC Davis, Cornell University, the Hudson Alpha Institute for Biotechnology and Stanford University.

"Our findings involved the analysis of a large amount of data involving 12,000 gene transcripts obtained from donated brain tissue from depressed and normal people. We were amazed that our data revealed that clock gene rhythms varied in synchrony across six regions of normal human brain and that these rhythms were significantly disrupted in depressed patients. The findings provide clues for potential new classes of compounds to rapidly treat depression that may reset abnormal clock genes and normalize circadian rhythms," said Dr. William Bunney, Distinguished Professor of Psychiatry & Human Behavior at UC Irvine, and the study's senior author.

Circadian clock genes play an important role in regulating many body rhythms over a 24-hour cycle. Although animal data provide evidence for the circadian expression of genes in brain, little has been known as to whether there is a similar rhythmicity in human brain.

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Contact: Tom Vasich
tmvasich@uci.edu
949-824-6455
University of California - Irvine
Source:Eurekalert

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