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Building a better mouse model to study depression

Date:
May 20, 2011
Source:
University of Pittsburgh Schools of the Health Sciences
Summary:
Researchers have developed a mouse model of major depressive disorder (MDD) that is based on a rare genetic mutation that appears to cause MDD in the majority of people who inherit it. The findings could help clarify the brain events that lead to MDD and contribute to new and better means of treatment and prevention.
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The chimeric mouse on the left is made up of a mixture of normal (white) cells and mutant (black) cells as reflected in the variation in its fur color. The chimera is the father of the first MDD (major depressive disorder) mouse shown on the right. The MDD mouse has been engineered to contain a rare mutation that typically leads to MDD in people who inherit it, and provides a new model to study the brain mechanism that leads to this common and debilitating illness.
Credit: Zubenko, GS, Hughes III HB. Am J Med Genet Part B, 2011. Copyright © 2011 Wiley-Liss, Inc.

Researchers at the University of Pittsburgh School of Medicine have developed a mouse model of major depressive disorder (MDD) that is based on a rare genetic mutation that appears to cause MDD in the majority of people who inherit it. The findings, which were published online May 19 in the American Journal of Medical Genetics Part B: Neuropsychiatric Genetics EarlyView, could help to clarify the brain events that lead to MDD, and contribute to the development of new and better means of treatment and prevention. This report also illustrates an advance in the design of recombinant mouse models that should be applicable to many human diseases.

"Major depressive disorder is a leading cause of suffering, disability and premature death from all causes including suicide. While the cause currently is unknown, twin and adoption studies indicate that genetic factors account for 40 to 70 percent of the risk for developing this common disorder," explained lead author George Zubenko, M.D., Ph.D., professor of psychiatry, Pitt School of Medicine.

"In this report, we describe how we constructed a laboratory mouse strain that mimics the brain mechanism that leads to major depression in humans, rather than symptoms," he said. "Nonetheless, in our initial characterization, the mutant mice exhibited several features that were reminiscent of the human disorder, including alterations of brain anatomy, gene expression, behavior, as well as increased infant mortality."

"These findings support the role of the genetic variant in the development of MDD, and affirm the mutant mouse strain as a model of MDD worthy of further study," Dr. Zubenko said. Hugh B. Hughes, III, M.S., served as the co-author of this report.

Previous studies of families with a severe and strongly familial form of MDD revealed a mutation in the control region of CREB1, a gene that orchestrates the expression of many other genes that play important roles in normal brain functioning. Mice have a CREB1 gene that is very similar to the human version and, with the aid of genetic engineering techniques, the researchers were able to establish a mutant mouse strain that bore the same genetic error. Since the control regions of corresponding human and mouse genes often have regions of high similarity, the methods described in this report may be useful in creating mouse models of other human diseases.

"Treatments that are the most effective and produce the fewest side effects typically address the root causes of the disease," Dr. Zubenko noted. "Animal models that recapitulate those root causes should better inform us about the brain mechanisms that lead to MDD, and have the best chance of leading to advances in treatment and prevention."

This work was supported by grants from the National Institute of Mental Health; and the Provost's Fund for Research Development and the Shane Richard Brown Fund, both of the University of Pittsburgh. MRI data were collected at the Pittsburgh NMR Center for Biomedical Research at Carnegie Mellon University and were analyzed with support from the Office of the Senior Vice Chancellor for the Health Sciences, University of Pittsburgh, and the National Center for Research Resources, a component of the National Institutes of Health (NIH) and NIH Roadmap for Medical Research.


Story Source:

The above story is based on materials provided by University of Pittsburgh Schools of the Health Sciences. Note: Materials may be edited for content and length.


Journal Reference:

  1. George S. Zubenko, Hugh B. Hughes. Replacement of homologous mouse DNA sequence with pathogenic 6-base human CREB1 promoter sequence creates murine model of major depressive disorder. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, 2011; DOI: 10.1002/ajmg.b.31197

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University of Pittsburgh Schools of the Health Sciences. "Building a better mouse model to study depression." ScienceDaily. ScienceDaily, 20 May 2011. <www.sciencedaily.com/releases/2011/05/110519090141.htm>.
University of Pittsburgh Schools of the Health Sciences. (2011, May 20). Building a better mouse model to study depression. ScienceDaily. Retrieved May 29, 2015 from www.sciencedaily.com/releases/2011/05/110519090141.htm
University of Pittsburgh Schools of the Health Sciences. "Building a better mouse model to study depression." ScienceDaily. www.sciencedaily.com/releases/2011/05/110519090141.htm (accessed May 29, 2015).

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