Aróstegui Gorospe, Juan IgnacioRabionet, RaquelRemesal, AgustínMensa Vilaró, AnnaMurias, SaraAlcobendas, RosaGonzález-Roca, EvaDreschsel, OliverRuíz Ortiz, EstíbalizPuig, AnnaComas, David, 1969-Ossowski, StephanYagüe, Jordi L.Estivill, Xavier, 1955-Merino, Rosa2016-07-062016-07-062015Arostegui JI, Rabionet R, Remesal A, Mensa-Vilaro A, Murias S, Alcobendas R et al. A family carrying a homozygous LACC1 truncated mutation expands the clinical phenotype of this disease beyond systemic-onset juvenile idiopathic arthritis. Pediatric Rheumatology. 2015;13(Suppl. 1):O76. DOI: 10.1186/1546-0096-13-S1-O761546-0096http://hdl.handle.net/10230/27007We identified a consanguineous Moroccan family with three affected siblings diagnosed with rheumatoid factor-negative polyarticular juvenile idiopathic arthritis. They all suffered from an early-onset (2-4 years-old) chronic and symmetric polyarthritis affecting both large and small joints. The joint involvement was markedly erosive in two siblings, with the older sister requiring hip prosthetic replacement at the age of 18 years. None of the patients had fever, skin rash, uveitis or other extra-articular manifestations. Laboratory analyses revealed leukocytosis, thrombocytosis, severe anaemia, marked increase of inflammatory markers and negative results for rheumatoid factor, anti-nuclear antibodies and HLA-B27application/pdfeng© 2015 Arostegui et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided theoriginal work is properly cited.ArtritisGenèticainfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1186/1546-0096-13-S1-O76info:eu-repo/semantics/openAccess