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WASHINGTON - A single gene promotes development of essential tremor in some patients and Parkinson’s disease in others has been identified by an international team of researchers. In a study report published in Parkinsonism and Related Disorders, Mayo Clinic researchers in Florida and their collaborators worldwide note that patients with essential tremor shake when they move, while those with Parkinson’s disease shake when they are at rest. They further state that a variant in LINGO1, a gene involved in neuronal survival, is the first proven evidence of a common genetic component in the development of both disorders.