López-Mejías, RaquelGenre, FernandaRemuzgo-Martínez, SaraSevilla Pérez, BelénCastañeda, SantosLlorca, JavierOrtego-Centeno, NorbertoUbilla, BegoñaMijares, VerónicaPina, TrinitarioCalvo-Río, VanesaPalmou, NataliaMiranda-Filloy, José ANavas Parejo, AntonioArgila, DiegoSánchez-Pérez, JavierRubio, EstebanLeón Luque, ManuelBlanco-Madrigal, Juan MaríaGalíndez-Aguirregoikoa, EvaOcejo-Vinyals, J GonzaloMartín, JavierBlanco, RicardoGonzález-Gay, Miguel A2016-12-052016-12-052015-10-13López-Mejías R, Genre F, Remuzgo-Martínez S, Pérez BS, Castañeda S, Llorca J, et al. Role of PTPN22 and CSK gene polymorphisms as predictors of susceptibility and clinical heterogeneity in patients with Henoch-Schönlein purpura (IgA vasculitis). Arthritis Res. Ther. 2015; 17:2861478-6354http://hdl.handle.net/10668/2556Journal Article; Research Support, Non-U.S. Gov't;INTRODUCTION To determine whether the PTPN22 (protein tyrosine phosphatase nonreceptor 22)/CSK (c-src tyrosine kinase) pathway is implicated in the susceptibility and clinical heterogeneity of Henoch-Schönlein purpura (HSP) in the largest series of Caucasian HSP patients ever assessed for genetic studies. METHODS A set of 329 Spanish patients diagnosed with HSP fulfilling the American College of Rheumatology and the Michel et al. classification criteria and 515 sex and ethnically matched controls were recruited in this study. Two well-known CSK (CSK rs34933034 and CSK rs1378942) and two functional PTPN22 (PTPN22 rs2476601 (R620W) and PTPN22 rs33996649 (R263Q)) polymorphisms, previously associated with autoimmunity, were genotyped with TaqMan single nucleotide polymorphism (SNP) genotyping assays. RESULTS No significant differences in the genotype and allele frequencies between HSP patients and controls were observed when the CSK rs34933034, CSK rs1378942, PTPN22 rs2476601 (R620W) and PTPN22 rs33996649 (R263Q) polymorphisms were analyzed independently. In keeping with this observation, no significant differences were found when we assessed these polymorphisms combined conforming haplotypes. In addition, there were no differences in the allele or genotype frequencies when HSP patients were stratified according the age at disease onset, sex, presence of arthralgia/arthritis, nephritis or gastrointestinal manifestations. CONCLUSIONS Our results do not support association between PTPN22/CSK and HSP.enNiñoFemeninoFrecuencia de los genesAdultoPredisposición genética a la enfermedadGenotipoHumanosMasculinoPolimorfismo de nucleótido simpleProteína tirosina fosfatasa no receptora tipo 22Púrpura de Schoenlein-HenochReacción en cadena en tiempo real de la polimerasaEspañaMedical Subject Headings::Named Groups::Persons::Age Groups::ChildMedical Subject Headings::Check Tags::FemaleMedical Subject Headings::Phenomena and Processes::Genetic Phenomena::Gene FrequencyMedical Subject Headings::Phenomena and Processes::Genetic Phenomena::Genotype::Genetic Predisposition to DiseaseMedical Subject Headings::Phenomena and Processes::Genetic Phenomena::GenotypeMedical Subject Headings::Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::HumansMedical Subject Headings::Check Tags::MaleMedical Subject Headings::Phenomena and Processes::Genetic Phenomena::Genetic Variation::Polymorphism, Genetic::Polymorphism, Single NucleotideMedical Subject Headings::Diseases::Hemic and Lymphatic Diseases::Hematologic Diseases::Blood Coagulation Disorders::Purpura::Purpura, Schoenlein-HenochMedical Subject Headings::Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Genetic Techniques::Nucleic Acid Amplification Techniques::Polymerase Chain Reaction::Real-Time Polymerase Chain ReactionMedical Subject Headings::Geographicals::Geographic Locations::Europe::SpainMedical Subject Headings::Named Groups::Persons::Age Groups::Adultresearch article26458874open access10.1186/s13075-015-0796-x1478-6362PMC4603645