title: Distinct seasonal patterns in the onset of adult idiopathic inflammatory myopathy in patients with anti-Jo-1 and anti-signal recognition particle autoantibodies.
abstract: In idiopathic inflammatory myopathy (IIM; or, polymyositis/dermatomyositis), the myositis-specific autoantibodies anti-Jo-1 and anti-signal recognition particle (anti-SRP), appear to define clinically and immunogenetically distinct groups of patients. We show here that the month during which the onset of weakness occurs is not random in patients with anti-Jo-1 auto-antibodies (average month April, P less than 0.02) and in those with anti-SRP autoantibodies (average month November, P less than 0.02); both groups of patients also experience rapid onset of disease. By contrast, patients classified into the traditional categories of polymyositis and dermatomyositis do not have recognizable seasonal patterns and do not differ in the rate of onset of disease. These findings suggest that searches for seasonal patterns in the onset of autoimmune disorders characterized by disease-specific autoantibodies may provide useful clues to etiology.
authors.affiliation: Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892.
authors.forename: R L
authors.initials: RL
authors.lastname: Leff
authors.forename: S H
authors.initials: SH
authors.lastname: Burgess
authors.forename: F W
authors.initials: FW
authors.lastname: Miller
authors.forename: L A
authors.initials: LA
authors.lastname: Love
authors.forename: I N
authors.initials: IN
authors.lastname: Targoff
authors.forename: M C
authors.initials: MC
authors.lastname: Dalakas
authors.forename: M M
authors.initials: MM
authors.lastname: Joffe
authors.forename: P H
authors.initials: PH
authors.lastname: Plotz
mesh_terms: D000328:Adult; D001323:Autoantibodies / Q000032:analysis*; D001327:Autoimmune Diseases / Q000276:immunology*; D003882:Dermatomyositis / Q000276:immunology; D005260:Female; D006801:Humans; D007159:Immunologic Tests; D008297:Male; D009220:Myositis / Q000276:immunology*; D012621:Seasons
chemical_list: D001323:Autoantibodies