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Hopkins researchers piece together gene 'network' linked to schizophrenia
Date:9/2/2008

Reporting this week in the Archives of General Psychiatry, researchers at the Johns Hopkins University School of Medicine have uncovered for the first time molecular circuitry associated with schizophrenia that links three previously known, yet unrelated proteins.

"This is very exciting because until now the many known genetic factors implicated in this condition were not connected in any way," says Akira Sawa, M.D., Ph.D., director of the program in molecular psychiatry and associate professor of psychiatry and neuroscience at Hopkins. "Now, through a cross-disciplinary and cross-departmental collaboration, we not only have figured out how these three proteins interact with each other, we also have found patients who carry mutations. These results give us a really good foundation to dig deeper into such an elusive condition."

Sawa's team previously had characterized the DISC1 gene and protein which are required for proper nervous system development, and when disrupted, significantly contribute to schizophrenia. His team also had shown that DISC1 protein binds to PCM1 protein at the centrosome, which coordinates the structure and movement of cells.

Separately, Hopkins geneticist and associate professor of ophthalmology Nicholas Katsanis, Ph.D., and his team were studying an unrelated family of proteins had discovered that one of them, BBS4, also is found near the centrosome and also binds to PCM1. "But we weren't thinking schizophrenia at the time because BBS4 is involved in Bardet-Biedl Syndrome, which is a wide-ranging condition mainly known for its associated eye and and kidney problems but also does cause behavioral defects in some patients," says Katsanis.

It was Hopkins psychiatrist Nicola Cascella, M.D., co-director of the program in molecular psychiatry and assistant professor of psychiatry who, according to Sawa, "brought it all together" by realizing that the behavioral defects seen in Bardet-Biedl Syndrome pa
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Contact: Audrey Huang
audrey@jhmi.edu
410-614-5105
Johns Hopkins Medical Institutions
Source:Eurekalert

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