Allelic variation of serotonin transporter expression is associated with depression in Parkinson's disease

Mössner, R.; Henneberg, A.; Schmitt, A.; Syagailo, Y.V.; Grässle, M.; Hennig, T.; Simantov, R.; Gerlach, M.; Riederer, P.; Lesch, K.P.
May 2001
Molecular Psychiatry;2001, Vol. 6 Issue 3, p350
Academic Journal
Idiopathic Parkinson's disease (PD) is a common neurodegenerative disorder with prominent motor symptoms. However, depression is common in PD, affecting about 40% of PD patients. Since there is extensive evidence of degeneration of serotonin (5HT) neurons and loss of the 5HT transporter (5HTT) in PD, we assessed whether a functional polymorphism in the promoter of the 5HTT gene (5HTT gene-linked polymorphic region, 5HTTLPR), which determines high or Iow 5HT uptake, is associated with depressive symptomatology in PD patients. We found that patients with the short allele of the 5HTTLPR had significantly higher scores on the Hamilton Depression Scale. A functional promoter polymorphism of the monoamine oxidase A (MAOA) gene showed no association. Thus, the 5HTTLPR but not the MAOA gene promoter-associated polymorphism may be a risk factor for depression in PD patients, while neither polymorphism increases the risk for development of Parkinson's disease itself.


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