Pathogenesis of many diseases is related to the influence of noxious environmental agents coupled with individual genetic sensitivity that depends on the function of detoxificating enzymes. One of the latter is N-acetyltransferase 2 whose mutations lead to an impairment of the enzyme function. Genetically determined acetylation rate reduction with exposure to neurotoxins may contribute to the development of Parkinson's disease (PD). While both genetic and environmental factors are implicated in etiology of PD, genetic factors may play a crucial role in early-onset Parkinson's disease (in patients aged under 50).
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