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From the Department of Medicine (Drs. Grimes and Bulman), Division of Neurology, The Ottawa Hospital; Ottawa Health Research Institute (Drs. Grimes, Han, and Bulman, and L. Racacho), University of Ottawa, Centre for Neuromuscular Disease; Department of Medicine (Drs. Lang and St. George-Hyslop), Division of Neurology, The University Health Network–Toronto Western Hospital; and Centre for Research in Neurodegenerative Disease (Dr. St. George-Hyslop), University of Toronto, Canada.
Address correspondence and reprint requests to Dr. D.A. Grimes, The Ottawa Hospital, Civic Campus, 1053 Carling Avenue, Ottawa, Canada, K1Y 4E9; e-mail: dagrimes{at}ottawahospital.on.ca
Objective: Inherited myoclonus-dystonia (IMD) is a new term for an autosomal dominant disorder characterized by myoclonus and dystonia. Recently, IMD was linked to a region on chromosome 11q23 with two different mutations identified in the D2 dopamine receptor gene and linked to chromosome 7q with five different loss-of-function mutations identified in the 
-sarcoglycan gene.
Methods: These two regions and genes were excluded in a large Canadian family with IMD in whom 13 individuals are affected. A 25-cM genome scan of this large family with 32 individuals was performed.
Results: Two-point linkage analysis revealed a maximum lod score of 3.5 (recombination fraction 0.00; affected only) for the microsatellite marker GATA185C06-18 and a multipoint lod score of 3.9 across the 18p11 region. Haplotype analysis demonstrates that all the affected individuals shared a common haplotype between markers D18S1132 and D18S843 that defines the disease gene within a span of 16.9 cM.
Conclusions: These findings indicate that a novel IMD gene exists on chromosome 18p11.
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