We previously observed an association with Parkinson's (PD), and modification of the effect of smoking on PD, by a polymorphism of the monoamine oxidase B (MAO-B) gene. The A form of monoamine oxidase (MAO-A) shares with MAO-B many characteristics that could be relevant to PD, especially proneuroxicant bioactivation and dopamine metabolism. MAO-A is also inhibited by tobacco smoke, which bears an apparent protective effect on PD. We investigated the possibility that MAO-A genetic variants may also be involved in predisposition to PD and in modification of the effect of smoking. Three-hundred and seventy-one subjects--145 idiopathic PD cases and 226 age/gender-matched controls--were genotyped for the EcoRV polymorphism of MAO-A gene which has been related to increased enzyme activity. MAO-A EcoRV polymorphism was neither significantly associated with PD nor did it modify the inverse relationship with smoking. These results suggest that the EcoRV polymorphism of MAO-A is not an important biomarker of PD risk.
The EcoRV genetic polymorphism of human monoamine oxidase type A is not associated with Parkinson's disease and does not modify the effect of smoking on Parkinson's disease / Costa-Mallen, P; Checkoway, H; Fishel, M; Cohen, A. W; Smith-Weller, T; Franklin, G. M; Swanson, P. D; Costa, L. G.. - In: NEUROSCIENCE LETTERS. - ISSN 0304-3940. - 278:1-2(2000), p. 33-6.
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