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Neurology, Vol 45, Issue 5 924-928, Copyright © 1995 by American Academy of Neurology

ARTICLES

Clinical evidence of genomic imprinting in Tourette's syndrome

DG Lichter, LA Jackson and M Schachter
Department of Neurology, SUNY, Buffalo, NY 14215, USA.

Recent genetic studies of Tourette's syndrome (TS) have suggested a sex- specific expression of TS behaviors but not a sex-associated difference in their transmission. In a retrospective study designed to assess the influence of gender of the affected parent on childhood TS phenotype, we compared unmedicated TS subjects with patrilineal (n = 25) or matrilineal (n = 25) inheritance of TS, as determined by family history methodology, with respect to demographic variables, temporal profile of tic evolution, and clinical ratings of tics and associated behaviors, particularly obsessive-compulsive symptoms and attention deficit hyperactivity disorder (ADHD). Maternal transmission of TS was characterized by trends toward greater motor tic complexity and more frequent noninterfering rituals (p < 0.05); paternal transmission was associated with increased vocal tic frequency (p = 0.01), an earlier onset of vocal tics relative to motor tics (p < 0.01), and more prominent ADHD behaviors, including motor restlessness (p < 0.01). These findings are consistent with genomic imprinting in TS. Confirmation of this phenomenon promises not only to advance understanding concerning the genetic link between TS and ADHD but may also help to explain the apparent fit of competing models of genetic transmission in TS.


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