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[Abstract Title]. - Society for Neuroscience

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249. Dyslexia, SLI, and Other Disorders of Cognition and Behavior<br />

Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm<br />

Program#/Poster#: 249.4/U23<br />

Topic: C.05.d. ADHD, SLI, dyslexia and other specific disorders of neurobehavior<br />

Support: Tourette Syndrome Association<br />

Mittelstaedt family<br />

NINDS K23 NS41920<br />

<strong>Title</strong>: Tourette syndrome blood gene expression profiles distinguish comorbid ADHD and OCD<br />

Authors: *L. LIT 1 , F. R. SHARP 2 , D. L. GILBERT 3 ;<br />

2 Neurol. and M.I.N.D. Inst., 1 Univ. Cali<strong>for</strong>nia Davis, Sacramento, CA; 3 Pediatric Neurol.,<br />

Cincinnati Children‟s Hosp. Med. Ctr., Cincinnati, OH<br />

<strong>Abstract</strong>: Tourette syndrome (TS) is characterized by verbal and motor tics that occur <strong>for</strong> more<br />

than one year and are not attributed to another condition. TS is often comorbid with attention<br />

deficit hyperactive disorder (TS+ADHD), obsessive-compulsive disorder (TS+OCD) or both<br />

(TS+ADHD/OCD). Underlying dysfunctional cortico-striato-thalamo-cortical (CSTC) circuitry,<br />

affecting functionally distinct yet anatomically overlapping regions, is suspected to contribute to<br />

this comorbidity. All three disorders reflect failure to inhibit unwanted actions: motor/verbal tics<br />

(TS), repetitive behaviors (OCD), or inappropriate behaviors (ADHD). Elucidation of molecular<br />

mechanisms is needed to understand etiology and pathophysiology and develop specific<br />

treatments. Here we show that TS-only, TS+ADHD, TS+OCD, and TS+ADHD/OCD have<br />

distinct blood RNA expression profiles based upon the expression of 400-500 genes. These<br />

findings support a distinct pathophysiology and pharmacology of ADHD and OCD within TS.<br />

Moreover, the data is the first to suggest two distinct biological types of ADHD and two types of<br />

OCD. One type of ADHD and one type of OCD occur when they are co-morbid with TS alone<br />

(TS+ADHD1 or TS+OCD1); and the second types of ADHD and OCD occur when both are<br />

comorbid with TS (TS+ADHD2/OCD2).<br />

Disclosures: L. Lit , None; D.L. Gilbert, None; F.R. Sharp, None.<br />

Poster<br />

249. Dyslexia, SLI, and Other Disorders of Cognition and Behavior<br />

Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm

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