title: Familial dyskinesia and facial myokymia (FDFM): Follow-up of a large family and linkage to chromosome 3p21-3q21.
abstract: We previously reported a five-generation family manifesting an autosomal dominant disorder of facial myokymia and dystonic/choreic movements (FDFM). The dyskinetic episodes are initially paroxysmal but may become constant. With increasing age they may lessen or even disappear. The previous study excluded nine candidate genes chosen for their association with myokymia or chorea and two regions containing single or clustered ion channel genes. We now report identification by whole genome linkage analysis of a broad region on chromosome 3p21-3q21 that segregates with the disease in all 10 affected members in three generations who participated in the study. GENEHUNTER-MODSCORE Version 2.0.1 provided a maximum multipoint LOD score of 3.099. No other disorders primarily characterized by myokymia, dystonia, or chorea are known to map to this region. Identification of additional families with FDFM may narrow the critical region and facilitate the choice of candidate genes for further analysis.
authors.affiliation: Department of Medicine, University of Washington School of Medicine, Seattle, Washington 98195-7720, USA. wendyrun@u.washington.edu
authors.forename: Wendy H
authors.initials: WH
authors.lastname: Raskind
authors.forename: Mark
authors.initials: M
authors.lastname: Matsushita
authors.forename: Beate
authors.initials: B
authors.lastname: Peter
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Biberston
authors.forename: John
authors.initials: J
authors.lastname: Wolff
authors.forename: Hillary
authors.initials: H
authors.lastname: Lipe
authors.forename: Ruben
authors.initials: R
authors.lastname: Burbank
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Bird
mesh_terms: D002874:Chromosome Mapping; D002893:Chromosomes, Human, Pair 3 / Q000235:genetics*; D020820:Dyskinesias / Q000235:genetics*; D005155:Facial Nerve Diseases / Q000235:genetics*; D005500:Follow-Up Studies; D008040:Genetic Linkage; D005819:Genetic Markers / Q000235:genetics; D020022:Genetic Predisposition to Disease; D006801:Humans; D010375:Pedigree
chemical_list: D005819:Genetic Markers