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Study Shows a Link Between Schizophrenia & Genetic Mutations
Date:7/20/2009

LOS ANGELES, July 20 /PRNewswire/ -- A link between schizophrenia and ultra-rare variants in microRNA genes on the X-chromosome has been identified. Mutations in a subset of these regulatory RNA genes may strongly predispose to schizophrenia. The recently published study in PLoS ONE by the laboratories of Steve S. Sommer, MD, PhD and John J. Rossi, PhD reports the first association of microRNA dysfunction with schizophrenia. This breakthrough may have preventive or therapeutic implications.

Schizophrenia is a common and devastating brain disease, often presenting in the teens or twenties and affecting about 1% of the population. As affected individuals are typically handicapped for many decades, it is one of the costliest of diseases, roughly comparable with the aggregate cost of a serious cancer. Schizophrenia affects people of all races, ethnic groups, and socioeconomic status, including the economics professor with mild schizophrenia described in the movie "A Beautiful Mind". Some of the homeless population are affected with schizophrenia, as illustrated by the recent movie "The Soloist".

MicroRNAs (miRNA) are a large family of small, non-coding RNAs that down-regulate the expression of a variety of genes and are scattered over the genome. Components required for miRNA processing and/or function have been implicated in X-linked mental retardation, neurological diseases and cancer, suggesting wide ranging involvement of miRNAs in disease.

In this study, the sequences of 59 miRNA genes on the X-chromosome were determined in 193 men with schizophrenia and 191 without the disease. Men were chosen because they are much more commonly affected by mutations in genes on the X-chromosome. Eight ultra-rare variants in eight distinct miRNA genes were detected in 4% of the men with schizophrenia while none were detected in normal men. While 4% may seem to be a small percenta
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SOURCE MEDomics
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