title: Interleukin 1 receptor antagonist gene polymorphism association with lichen sclerosus.
abstract: Cytokines play key roles in immune responses, inflammation and fibrosis. The balance between levels of cytokines, their receptors and specific inhibitors controls inflammatory reactions in tissues. The pathogenesis of lichen sclerosus is unknown but probably involves cytokine mediators such as interleukin 1 (IL-1) and interleukin 1 receptor antagonist (IL-1ra). The IL-1ra is a competitive inhibitor of IL-1 alpha and IL-1 beta, and therefore is a powerful endogenous anti-inflammatory molecule. The gene encoding IL-1ra (designated IL-1RN) has a variable number tandem repeat polymorphism in intron 2. There are five alleles of the gene corresponding to 2, 3, 4, 5 and 6 repeats of an 86-bp sequence. We have determined allele frequencies in a control population and a group of 78 patients with lichen sclerosus. The frequency of one of the alleles is related to increasing disease severity. Thus, IL-1RN may be a candidate gene or severity factor for lichen sclerosus or may possibly be a linked marker to another, as yet undefined, gene.
authors.affiliation: Section of Molecular Medicine, Royal Hallamshire Hospital, Sheffield, UK.
authors.forename: F E
authors.initials: FE
authors.lastname: Clay
authors.forename: M J
authors.initials: MJ
authors.lastname: Cork
authors.forename: J K
authors.initials: JK
authors.lastname: Tarlow
authors.forename: A I
authors.initials: AI
authors.lastname: Blakemore
authors.forename: C I
authors.initials: CI
authors.lastname: Harrington
authors.forename: F
authors.initials: F
authors.lastname: Lewis
authors.forename: G W
authors.initials: GW
authors.lastname: Duff
mesh_terms: D000483:Alleles; D001483:Base Sequence; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D018459:Lichen Sclerosus et Atrophicus / Q000235:genetics*; D008297:Male; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D017472:Receptors, Interleukin-1 / Q000037:antagonists & inhibitors*; D012795:Sialoglycoproteins / Q000235:genetics*
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D017472:Receptors, Interleukin-1; D012795:Sialoglycoproteins