title: Linkage of dermatomyositis in the Shetland Sheepdog to chromosome 35.
abstract: Dermatomyositis is an inflammatory disease of the skin and muscle and is most commonly found in the Shetland sheepdog. Both the clinical presentation and the age of onset of dermatomyositis vary widely, and the inability to diagnose dermatomyositis before clinical symptoms ensue has made control of the disease difficult. Identification of a genetic marker that cosegregates with dermatomyositis would facilitate the development of a DNA-based test for the early detection of affected dogs. We report the use of linkage disequilibrium (LD) mapping to identify linkage to phenotypic dermatomyositis in the Shetland sheepdog. One marker, microsatellite marker FH3570 on canine chromosome 35, had evidence of LD (P=0.00002). Further studies are necessary to narrow the region harbouring the dermatomyositis locus, identify candidate genes and determine mode of inheritance.
authors.affiliation: Department of Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A+M University, College Station, TX 77843, USA.
authors.forename: Leigh Anne
authors.initials: LA
authors.lastname: Clark
authors.forename: Kelly M
authors.initials: KM
authors.lastname: Credille
authors.forename: Keith E
authors.initials: KE
authors.lastname: Murphy
authors.forename: Christine A
authors.initials: CA
authors.lastname: Rees
mesh_terms: D017668:Age of Onset; D000818:Animals; D001947:Breeding; D002874:Chromosome Mapping; D003882:Dermatomyositis / Q000175:diagnosis / Q000235:genetics / Q000662:veterinary*; D004283:Dog Diseases / Q000175:diagnosis* / Q000235:genetics*; D004285:Dogs; D005787:Gene Frequency; D008040:Genetic Linkage; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D015810:Linkage Disequilibrium / Q000235:genetics*; D018895:Microsatellite Repeats
chemical_list: D005819:Genetic Markers