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Uncovering clues to the genetic cause of schizophrenia
Date:5/28/2014

NEW YORK, NY (May 21, 2014) The overall number and nature of mutationsrather than the presence of any single mutationinfluences an individual's risk of developing schizophrenia, as well as its severity, according to a discovery by Columbia University Medical Center researchers published in the latest issue of Neuron. The findings could have important implications for the early detection and treatment of schizophrenia.

Maria Karayiorgou, MD, professor of psychiatry and Joseph Gogos, MD, PhD, professor of physiology and cellular biophysics and of neuroscience, and their team sequenced the "exome"the region of the human genome that codes for proteinsof 231 schizophrenia patients and their unaffected parents. Using this data, they demonstrated that schizophrenia arises from collective damage across several genes.

"This study helps define a specific genetic mechanism that explains some of schizophrenia's heritability and clinical manifestation," said Dr. Karayiorgou, who is acting chief of the Division of Psychiatric and Medical Genetics at the New York State Psychiatric Institute. "Accumulation of damaged genes inherited from healthy parents leads to higher risk not only to develop schizophrenia but also to develop more severe forms of the disease."

Schizophrenia is a severe psychiatric disorder in which patients experience hallucination, delusion, apathy and cognitive difficulties. The disorder is relatively common, affecting around 1 in every 100 people, and the risk of developing schizophrenia is strongly increased if a family member has the disease. Previous research has focused on the search for individual genes that might trigger schizophrenia. The availability of new high-throughput DNA sequencing technology has contributed to a more holistic approach to the disease.

The researchers compared sequencing data to look for genetic differences and identify new loss-of-function mutationswhich are rarer, but have a m
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Contact: Lucky Tran
lt2549@columbia.edu
212-305-3689
Columbia University Medical Center
Source:Eurekalert  

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