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Researchers Discover Gene Essencial To Cerebellum Formation

Date:
March 16, 2007
Source:
Institute for Research in Biomedicine (IRB)
Summary:
Scientists have identified a molecular switch that causes the differentiation of neurons in the cerebellum, a part of the brain that helps to regulate motor functions. This research provides new information on the origin of different cells in the cerebellum, an important component of the central nervous system found in all vertebrates, including humans, and the part of the brain that controls movement.

The progenitors of the ventricular zone of the cerebellum without Ptf1a produce granular cells.
Credit: Image courtesy of Institute for Research in Biomedicine (IRB)

Scientists have identified a molecular switch that causes the differentiation of neurons in the cerebellum, a part of the brain that helps to regulate motor functions.

A study published this week in the scientific journal PNAS provides new information on the origin of different cells in the cerebellum, an important component of the central nervous system found in all vertebrates, including humans, and the part of the brain that controls movement. The study was completed by researchers from the Institute for Research in Biomedicine (IRB Barcelona), the Department of Cell Biology of the University of Barcelona (UB), the IMIM-Hospital del Mar, Pompeu Fabra University (UPF) and Vanderbilt University (Nashville, Tennessee, USA). The main authors of the study are Dr. Marta Pascual (IRB Barcelona and UB) and Ibane Abasolo (IMIM-Hospital del Mar-UPF).

Co-author of the study, Francisco X. Real, coordinator of the Research Unit on Cell and Molecular Biology at IMIM-Hospital del Mar and Professor at the UPF, explains that "this discovery sheds new light on the mechanisms of brain formation and has potential future applications for regenerative medicine. It provides crucial insight into the manipulation of truncal nerve cells (or stem cells) and their selective differentiation into 'gabergic' neurons, or cells that contain the neurotransmitter gamma-aminobutyric acid (GABA) and that act as inhibitors.

Eduardo Soriano, Principal Investigator of the Developmental Neurobiology and Regeneration laboratory at IRB Barcelona, and professor at the UB, maintains that the study explains two important principles: first, "that the protein Ptf1a/p48 is needed for the production and differentiation of Purkinje neurons, the most important cells in the cerebellum"; and second, "that in the absence of this protein, the progenitor cells that should produce Purkinje neurons do not differentiate correctly and instead produce a different type of neuron, granular cells, indicating that Ptf1a/p48 acts as a molecular switch."

The researchers hypothesized that a transcription factor, whose function is well known in the pancreas and which appears to play a role in the nervous system, is also involved in the development of the cerebellum. In order to test their idea, and characterize the new mechanism of cell differentation, the authors used mice with a disactivated gene that codes for the Ptf1a/48 protein, and compared them with mice that express the gene normally. Their conclusions provide new insight into origin of nerve cells that form the cerebellum in higher organisms.

In a second research project, led by Francisco Real and Eduardo Soriano and funded by the Fundaciσ La Caixa, the scientists aim to explore the potential of this gene to produce Purkinje neurons in a laboratory setting. The researchers will investigate whether the expression of Ptf1a/p48 can induce the production of Purkinje cells from stem cells and neurospheres, progenitor cells of adult neurons. This study is an important step toward understanding rare diseases, such as cerebellar ataxias, which is characterized by the degeneration of Purkinje cells. Producing this type of cell in the lab may lead to future neuronal replacement therapy.


Story Source:

The above story is based on materials provided by Institute for Research in Biomedicine (IRB). Note: Materials may be edited for content and length.


Cite This Page:

Institute for Research in Biomedicine (IRB). "Researchers Discover Gene Essencial To Cerebellum Formation." ScienceDaily. ScienceDaily, 16 March 2007. <www.sciencedaily.com/releases/2007/03/070307075628.htm>.
Institute for Research in Biomedicine (IRB). (2007, March 16). Researchers Discover Gene Essencial To Cerebellum Formation. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2007/03/070307075628.htm
Institute for Research in Biomedicine (IRB). "Researchers Discover Gene Essencial To Cerebellum Formation." ScienceDaily. www.sciencedaily.com/releases/2007/03/070307075628.htm (accessed September 30, 2014).

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