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Research Provides Fascinating Insight Into Molecular Mechanisms That Link Schizophrenia Gene
Two independent research studies published by Cell Press in the September 24th issue of the journal Neuron provide fascinating insight into the molecular mechanisms that link disrupted-in-schizophrenia 1 (DISC1) with the proper development and migration of neurons in the hippocampus, a brain area involved in learning and memory and associated with the pathology of schizophrenia.
Previous work established a key role for DISC1 in the process of neurogenesis, which occurs constitutively throughout life in a part of the hippocampus called the dentate gyrus. However, the signaling mechanisms by which DISC1 regulates the complex events of neuronal development have remained elusive. "Despite the initial promise that the study of DISC1 function would reveal susceptibility mechanisms of major disorders, including schizophrenia and bipolar disorder, a comprehensive picture of its function is far from complete, in part because DISC1 seems to have multiple roles in brain cell physiology," explains Dr. Atsushi Enomoto from Nagoya University Graduate School of Medicine in Japan.
Dr. Enomoto, along with Dr. Masahide Takahashi and other colleagues, found that DISC1 interacts with the actin-binding protein Girdin to regulate the development of nerve cell processes called axons. Girdin was previously identified as a substrate for AKT, another gene linked with schizophrenia, and is thought to be required for normal cellular structure. Cells from the dentate gyrus of neonatal mice lacking Girdin exhibited profound deficits in axon sprouting.
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