Dictionary of Human Evolution and Biology

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Essential Tremor

Probably the most common hereditary movement disorder; a late-onset (4th-6th decades) manifestation characterized by uncontrollable tremors of the arms, but other muscles may be involved. Affected individuals are reported to live significantly longer than unaffected family members. ETM1 is an autosomal dominant gene. A heterogenous degenerative condition, with similar symptoms is caused by another gene, ETM2. ETM is more common and less acute than epilepsy and less debilitating than familial Parkinson disease.

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