Although the genetic basis of Tourette syndrome is well established, uncertainty about how best to define and assess the Tourette syndrome phenotype has hampered efforts to identify the genes responsible for susceptibility to the disorder. In addition, such efforts have typically been underpowered or were undertaken before the technology was available to perform systematic genome-wide genetic investigations. The Tourette Syndrome Association International Consortium on Genetics was formed by more than a dozen research groups from around the world to develop common approaches to phenotyping Tourette syndrome and to pool samples for uniform, well-powered genetic investigations. Several recent advances, including the completion of genome-wide scans of affected sib-pairs and large families, show real promise for identifying Tourette syndrome susceptibility genes. In this review, we describe the key epidemiologic, linkage, and association studies in Tourette syndrome and illustrate the strategies currently being used to identify Tourette syndrome genes. (J Child Neurol 2006;21:665—671; DOI 10.2310/7010.2006.00168).
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