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A Houston Methodist researcher has unveiled a novel function of the cyclin-dependent kinase protein CDK19, a potential target for the prevention and treatment of Parkinson's and other disorders of the nervous system.   In a New study highlighting CDK19's surprising role in mitochondrial dynamics, Hyunglok Chung, Ph.D., and colleagues found the gene located in the cytoplasm of brain and muscle cells, suggesting it plays a key part in neurologic health.   "Mitochondrial dysfunction is a hallmark of several human diseases, so finding a new gene that influences it is very exciting," said Dr. Chung, an assistant professor of genetics in the Department of Neurology at the Houston Methodist Research Institute and a first author on the paper. "This is very much a hot topic in neurodegenerative disease research because we're learning more and more how disruptions to the normal processing of cellular energy production in mitochondria can lead to the development of disea…