Navigation Links
How schizophrenia develops: Major clues discovered

Schizophrenia may occur, in part, because of a problem in an intermittent on/off switch for a gene involved in making a key chemical messenger in the brain, scientists have found in a study of human brain tissue. The researchers found that the gene is turned on at increasingly high rates during normal development of the prefrontal cortex, the part of the brain involved in higher functions like thinking and decision-making but that this normal increase may not occur in people with schizophrenia.

The study was funded by the National Institutes of Healths National Institute of Mental Health (NIMH) and National Institute of Child Health and Human Development.

The gene, GAD1, makes an enzyme essential for production of the chemical messenger, called GABA. The more the gene is turned on, the more GABA synthesis can occur, under normal circumstances. GABA helps regulate the flow of electrical traffic that enables brain cells to communicate with each other. It is among the major neurotransmitters in the brain.

Abnormalities in brain development and in GABA synthesis are known to play a role in schizophrenia, but the underlying molecular mechanisms are unknown. In this study, scientists discovered that defects in specific epigenetic actions biochemical reactions that regulate gene activity, such as turning genes on and off so that they can make substances like the GAD1 enzyme are involved.

Results of the research were published in the October 17 issue of the Journal of Neuroscience, by Schahram Akbarian, MD, PhD, Hsien-Sung Huang, PhD student, and colleagues at the University of Massachusetts Medical School and Baylor College of Medicine.

This discovery opens a new area for exploration of schizophrenia, said NIMH Director Thomas R. Insel, MD. Studies have yielded very strong evidence that schizophrenia involves a decrease in the enzymes, like GAD1, that help make the neurotransmitter GABA. Now were starting to identify the mechanisms involved, and our discoveries are pointing to potential new targets for medications.

Another enzyme, Mll1, may play a role in the epigenetic actions. For genes to be turned on, temporary structural changes in certain proteins - histones - must take place to expose the genes' blueprints in DNA. The researchers found evidence that, in schizophrenia, changes in Mll1 activity may interfere with this process in histones whose alterations enable the GAD1 blueprint to be exposed.

The researchers also showed, in mice, that antipsychotic medications like clozapine appear to correct this epigenetic flaw. This raises the possibility of developing new medications aimed at correcting defects in the mechanisms involved.

Finding more precise molecular targets for development of new schizophrenia medications is a key effort, because it can lead to more effective treatments with fewer side effects. Clozapine and other current antipsychotic medications are effective for many patients, but not all, and they can cause side effects severe enough that some people choose to stop treatment.

The researchers also found that people with three different variations of the GAD1 gene variations previously associated with schizophrenia also were more likely to have indicators of a malfunction in brain development. Among them were indicators of altered epigenetic actions related to GABA synthesis.

Weve known that schizophrenia is a developmental disease, and that something happens in the maturation of the prefrontal cortex during this vulnerable period of life. Now were beginning to find out what it is, and that sets the stage for better ways of preventing and treating it, Akbarian said.


Contact: Susan Cahill
NIH/National Institute of Mental Health

Related biology news :

1. Brain Scans Reveal How Gene May Boost Schizophrenia Risk
2. Scientists move forward understanding of schizophrenia
3. Prenatal exposure to famine increases risk of schizophrenia
4. Engineered mouse mimics cognitive aspects of schizophrenia
5. Studies suggest new brain protein may help in treating schizophrenia, insomnia and anxiety
6. Brain tissue reveals possible genetic trigger for schizophrenia
7. Chemical maps hint at drugs effects on schizophrenia
8. Gene malfunctions cause schizophrenia, depression symptoms in mice
9. Columbia research lifts major hurdle to gene therapy for cancer
10. Researchers uncover sequence of major rice pathogen
11. Emergence of cancer as major cause of childhood death in developing countries is not being adequately addressed
Post Your Comments:
(Date:4/15/2016)...  A new partnership announced today will help ... in a fraction of the time it takes ... life insurance policies to consumers without requiring inconvenient ... Diagnostics, rapid testing (A1C, Cotinine and HIV) and ... weight, pulse, BMI, and activity data) available at ...
(Date:3/31/2016)... 31, 2016   ... the "Company") LegacyXChange is excited to release ... soon to be launched online site for trading 100% ... ) will also provide potential shareholders a sense of ... to an industry that is notorious for fraud. The ...
(Date:3/22/2016)... , March 22, 2016 ... report "Electronic Sensors Market for Consumer Industry by Type ... Others), Application (Communication & IT, Entertainment, Home ... Global Forecast to 2022", published by MarketsandMarkets, ... expected to reach USD 26.76 Billion by ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... A person commits a crime, and the detective ... the criminal down. An outbreak of foodborne illness ... (FDA) uses DNA evidence to track down the bacteria that ... It,s not. The FDA has increasingly used a complex, cutting-edge ... illnesses. Put as simply as possible, whole genome sequencing is ...
(Date:6/23/2016)... FRANCISCO , June 23, 2016   EpiBiome ... has secured $1 million in debt financing from Silicon ... ramp up automation and to advance its drug development ... its new facility. "SVB has been an ... beyond the services a traditional bank would provide," said ...
(Date:6/23/2016)... 23, 2016  Blueprint Bio, a company dedicated to ... medical community, has closed its Series A funding round, ... "We have received a commitment from Forentis ... need to meet our current goals," stated Matthew ... runway to complete validation on the current projects in ...
(Date:6/23/2016)... ... June 23, 2016 , ... Velocity Products, a division of ... and optimized exclusively for Okuma CNC machining centers at The International Manufacturing Technology ... among several companies with expertise in toolholding, cutting tools, machining dynamics and distribution, ...
Breaking Biology Technology: