Abstract
Obsessive-Compulsive Disorder (OCD) is a psychiatric condition with strong evidence for a genetic component and for the involvement of genes of the serotonin system. In a recent family-based association study we reported an association between the G allele of the G861C polymorphism of the 5HT1Dβ receptor gene and OCD. The aim of the present study was to further investigate for the presence of linkage disequilibrium between each of two polymorphisms of the 5HT1Dβ receptor gene and OCD in a larger sample of OCD families. In a total of 121 families the G861C and the T371G polymorphisms of the 5HT1Dβ receptor gene were genotyped using standard protocols. The genotyping data were analyzed with a new extension of the Transmission Disequilibrium Test (FBAT). The phenotypes considered in the analyses were the diagnosis of OCD and two quantitative phenotypes related to the diagnosis and clinically relevant, ie, the age at onset and the severity of OCD symptoms. We confirmed the previously found preferential transmission of the G861 allele to the affected subjects (z = 2.262, P = 0.02). No significant association was found between the polymorphism and the quantitative phenotypes considered. These results represent a confirmation of our previous published study and thus, could have important implications for the role of the 5HT1Dβ receptor gene in the pathogenesis and treatment of OCD. Further genetic investigations on this marker considering additional polymorphisms and other quantitative phenotypes related to OCD are warranted.
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Acknowledgements
This work has been supported by research grants of the Ontario Mental Health Foundation (Drs Richter and Kennedy), of the Canadian Institutes for Health Research (Drs Richter, Mundo, Macciardi, and Kennedy) and of the University of Toronto (ON), Canada (Dr Mundo).
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Mundo, E., Richter, M., Zai, G. et al. 5HT1Dβ Receptor gene implicated in the pathogenesis of Obsessive-Compulsive Disorder: further evidence from a family-based association study. Mol Psychiatry 7, 805–809 (2002). https://doi.org/10.1038/sj.mp.4001059
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DOI: https://doi.org/10.1038/sj.mp.4001059
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