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The disease mechanisms predisposing only a subgroup of children to uveitis are unknown. This study was undertaken to identify genetic susceptibility loci for uveitis in <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content>, using a genome\u2010wide association study in 522 children with <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Two cohorts of <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content> patients with ophthalmologic follow\u2010up data were genotyped. Data were then imputed using a genome\u2010wide imputation reference panel, and an <jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content>\u2010specific reference panel was used for imputing amino acids and <jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content> types in the major histocompatibility complex (<jats:styled-content style=\"fixed-case\">MHC<\/jats:styled-content>). After imputation, genome\u2010wide and <jats:styled-content style=\"fixed-case\">MHC<\/jats:styled-content>\u2010specific analyses were performed, and a reverse immunology approach was utilized to model antigen presentation at 13 common <jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">DR<\/jats:styled-content>\u03b21 alleles.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Presence of the amino acid serine at position 11 (serine 11) in <jats:italic><jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">DR<\/jats:styled-content>\u03b21<\/jats:italic> was associated with an increased risk of uveitis in <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content> patients (odds ratio [<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>] 2.60, <jats:italic>P<\/jats:italic> = 5.43 \u00d7 10<jats:sup>\u221210<\/jats:sup>) and was specific to girls (<jats:italic>P<\/jats:italic><jats:sub>females<\/jats:sub> = 7.61 \u00d7 10<jats:sup>\u221210<\/jats:sup> versus <jats:italic>P<\/jats:italic><jats:sub>males<\/jats:sub> = 0.18). Serine 11 resides in the <jats:styled-content style=\"fixed-case\">YST<\/jats:styled-content> motif in the peptide\u2010binding groove of <jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">DR<\/jats:styled-content>\u03b21; all 3 amino acids in this motif are in perfect linkage disequilibrium and show identical association with disease. Quantitative prediction of binding affinity revealed that <jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">DR<\/jats:styled-content>\u03b21 alleles with the <jats:styled-content style=\"fixed-case\">YST<\/jats:styled-content> motif could be distinguished on the basis of discernable peptide\u2010binding preferences.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>These findings highlight a genetically distinct, sexually dimorphic feature of <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content> with uveitis as compared to <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content> without uveitis. The association could be indicative of the potential involvement of antigen presentation by <jats:styled-content style=\"fixed-case\">HLA<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">DR<\/jats:styled-content>\u03b21 in the development of uveitis in <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content>. The results of this study may advance our progress toward improved treatments for, and possible prevention of, the sight\u2010threatening complications of uveitis in children with <jats:styled-content style=\"fixed-case\">JIA<\/jats:styled-content>.<\/jats:p><\/jats:sec>","DOI":"10.1002\/art.40484","type":"journal-article","created":{"date-parts":[[2018,3,7]],"date-time":"2018-03-07T12:41:19Z","timestamp":1520426479000},"page":"1155-1165","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Identification of an Amino Acid Motif in <scp>HLA<\/scp>\u2013<scp>DR<\/scp>\u03b21 That Distinguishes Uveitis in Patients With Juvenile Idiopathic Arthritis"],"prefix":"10.1002","volume":"70","author":[{"given":"Anne\u2010Mieke J. 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