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An association study between 5-HTTLPR polymorphism, COMT polymorphism, and Tourette's syndrome.
M C Cavallini1, D Di Bella, M Catalano
1Istituto Scientifico H San Raffaele, Department of Neuroscience, University of Milan Medical School, Via L. Prinetti, 29, 20127, Milan, Italy. cavallini.cristina@hsr.it
Psychiatry Research
|February 13, 2001
Summary
Genetic factors in Tourette's syndrome (TS) were examined. Specific gene variants in serotonin transporter (5-HTTLPR) and COMT were not associated with TS susceptibility in this study.
Area of Science:
- Neurogenetics
- Psychiatric Genetics
- Molecular Psychiatry
Background:
- Tourette's syndrome (TS) is a complex neurodevelopmental disorder with evidence suggesting a significant genetic component.
- Understanding the specific genetic underpinnings of TS is crucial for developing targeted treatments and interventions.
- Previous research has implicated various neurotransmitter systems, including serotonergic and dopaminergic pathways, in the etiology of TS.
Purpose of the Study:
- To investigate the potential association between two common genetic polymorphisms and susceptibility to Tourette's syndrome.
- Specifically, to examine the insertion/deletion polymorphism in the serotonin transporter gene promoter (5-HTTLPR) and the Val-158-Met substitution in the catechol-O-methyl-transferase (COMT) gene.
- To explore whether these genetic variations correlate with clinical subtypes of TS, such as co-occurring obsessive-compulsive disorder (OCD) or a family history of tics.
Main Methods:
- A case-control study design was employed, comparing 52 patients diagnosed with Tourette's syndrome to 63 healthy control subjects.
- Genotyping was performed to assess the presence of the 5-HTTLPR polymorphism and the COMT Val-158-Met polymorphism in all participants.
- Statistical analyses were conducted to determine genotypic and allelic associations between these polymorphisms and TS, including subgroup analyses based on clinical variables.
Main Results:
- No significant genotypic or allelic association was found between the 5-HTTLPR polymorphism and susceptibility to Tourette's syndrome.
- Similarly, the COMT Val-158-Met polymorphism showed no significant association with TS in the studied cohort.
- Subgroup analyses, considering factors like obsessive-compulsive disorder (OCD) comorbidity and family history of tics or OCD, also failed to reveal statistically significant associations.
Conclusions:
- The investigated 5-HTTLPR and COMT polymorphisms do not appear to confer significant liability to Tourette's syndrome in the studied population.
- These findings do not rule out the involvement of other functional polymorphisms in serotonergic or dopaminergic genes in the genetic etiology of TS.
- Tourette's syndrome is a complex disorder, and the genetic contribution of individual genes like those studied is likely to be small.