PMID- 31169548 OWN - NLM STAT- MEDLINE DCOM- 20200525 LR - 20210410 IS - 1531-6963 (Electronic) IS - 1040-8711 (Print) IS - 1040-8711 (Linking) VI - 31 IP - 5 DP - 2019 Sep TI - Implications of juvenile idiopathic arthritis genetic risk variants for disease pathogenesis and classification. PG - 401-410 LID - 10.1097/BOR.0000000000000637 [doi] AB - PURPOSE OF REVIEW: We assess the implications of recent advances in the genetics of juvenile idiopathic arthritis (JIA) for the evolving understanding of inflammatory arthritis in children. RECENT FINDINGS: JIA exhibits prominent genetic associations with the human leukocyte antigen (HLA) region, extending perhaps surprisingly even to the hyperinflammatory systemic JIA category. Some HLA associations resemble those for adult-onset inflammatory arthritides, providing evidence for pathogenic continuity across the age spectrum. Genome-wide association studies have defined an increasing number of JIA-linked non-HLA loci, many again shared with adult-onset arthritis. As most risk loci contain only noncoding variants, new experimental methods such as SNP-seq and innovative big-data strategies help identify responsible causative mutations, termed functional SNPs (fSNPs). Alternately, gene hunting in multiplex families implicates new genes in monogenic childhood arthritis, including MYD88 and the intriguing innate immune gene LACC1. SUMMARY: Genetic data indicate a continuity between JIA and adult arthritis poorly reflected in current nomenclature. Advancing methodologies will help to identify new pathogenic mechanisms that inform the understanding of biologic subdivisions within JIA. Resulting insights will facilitate the application of lessons learned across the age spectrum to the treatment of arthritis in children and adults. FAU - Nigrovic, Peter A AU - Nigrovic PA AD - Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital. AD - Division of Immunology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts. FAU - Martinez-Bonet, Marta AU - Martinez-Bonet M AD - Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital. AD - Instituto de Investigacion Sanitaria Gregorio Maranon, Madrid, Spain. FAU - Thompson, Susan D AU - Thompson SD AD - Center for Autoimmune Genomics and Etiology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio, USA. LA - eng GR - R01 AR073201/AR/NIAMS NIH HHS/United States GR - P30 AR070253/AR/NIAMS NIH HHS/United States GR - R01 AR065538/AR/NIAMS NIH HHS/United States GR - P30 AR070549/AR/NIAMS NIH HHS/United States GR - R01 AR075906/AR/NIAMS NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Review PL - United States TA - Curr Opin Rheumatol JT - Current opinion in rheumatology JID - 9000851 RN - 0 (HLA Antigens) SB - IM MH - Arthritis, Juvenile/*genetics MH - *Genetic Predisposition to Disease MH - Genome-Wide Association Study/*methods MH - HLA Antigens/*genetics MH - Humans MH - *Polymorphism, Single Nucleotide MH - Risk Factors PMC - PMC6800096 MID - NIHMS1054690 EDAT- 2019/06/07 06:00 MHDA- 2020/05/26 06:00 PMCR- 2020/09/01 CRDT- 2019/06/07 06:00 PHST- 2019/06/07 06:00 [pubmed] PHST- 2020/05/26 06:00 [medline] PHST- 2019/06/07 06:00 [entrez] PHST- 2020/09/01 00:00 [pmc-release] AID - 10.1097/BOR.0000000000000637 [doi] PST - ppublish SO - Curr Opin Rheumatol. 2019 Sep;31(5):401-410. doi: 10.1097/BOR.0000000000000637.