AB0096 IGA VASCULITIS AND IGA NEPHROPATHY SHARE A SIMILAR IL17A ASSOCIATION PATTERN

D Prieto-Peña ,S Remuzgo Martinez,D De Argila,Javier Llorca ,Luis Martín-Penagos ,E Galíndez ,Jesús Calviño ,Paz Collado ,Antonio Fernández‐Nebro ,Ana Peñalba ,R Blanco ,N Ortego ,Javier Sánchez Pérez ,B Sevilla ,Secundino Cigarrán ,Belén Atienza‐Mateo ,José A Miranda‐Filloy ,Leticia Lera‐Gómez ,Joaquı́n Ibáñez ,María Teresa Leonardo ,Esteban Rubio‐Romero ,Fernanda Genre ,Javier Narváez ,Verónica Pulito‐Cueto ,Luis Caminal Montero ,Genshan Ma ,Gisela Díaz-Cordovés ,Carmen Cobelo ,Juan María Blanco-Madrigal ,Santos Castañeda ,Manuel León Luque ,Raquel López‐Mejías

doi:10.1136/annrheumdis-2021-eular.766

Abstract

Background:IgA vasculitis (IgAV) and IgA nephropathy (IgAN) are inflammatory conditions that share pathogenic and molecular mechanisms [1] and may represent different outcomes of a continuous spectrum of disease [2]. Interleukin (IL)17A has been identified as a common genetic risk locus for several immune-mediated diseases [3, 4].Objectives:To determine whether IgAV and IgAN exhibit a different IL17A association pattern.Methods:Five IL17A tag polymorphisms (rs4711998, rs8193036, rs3819024, rs2275913 and rs7747909) were genotyped in 388 Caucasian patients with IgAV, 99 patients with IgAN and 1,003 sex and ethnically matched healthy controls.Results:No statistically significant differences between patients with IgAV and healthy controls and between patients with IgAN and healthy controls were observed when each IL17A genetic variant was analyzed independently (Table 1). Similarly, IgAV patients exhibited similar genotype and allele IL17A frequencies than those with IgAN (Table 1). Moreover, no genotype or allele differences between IgAV patients who developed nephritis and patients with IgAN were detected. Furthermore, haplotype frequencies were similar in patients with IgAV, IgAV and nephritis and those with IgAN.Table 1.Genotype and allele frequencies of IL17A gene in patients with IgA vasculitis, patients with IgA nephropathy and healthy controls.PolymorphismChangeData set1/11/22/212rs4711998G/AIgAV53.4 (207)38.9 (151)7.7 (30)72.8 (565)27.2 (211)IgAN49.0 (48)42.9 (42)8.2 (8)70.4 (138)29.6 (58)Controls52.7 (529)41.2 (413)6.1 (61)73.3 (1471)26.7 (535)rs8193036T/CIgAV57.0 (221)38.4 (149)4.6 (18)76.2 (591)23.8 (185)IgAN64.3 (63)31.6 (31)4.1 (4)80.1 (157)19.9 (39)Controls60.3 (605)35.2 (353)4.5 (45)77.9 (1563)22.1 (443)rs3819024A/GIgAV44.1 (171)43.3 (168)12.6 (49)65.7 (510)34.3 (266)IgAN39.4 (39)54.5 (54)6.1 (6)66.7 (132)33.3 (66)Controls45.6 (457)44.6 (447)9.9 (99)67.8 (1361)32.2 (645)rs2275913G/AIgAV44.6 (172)43.3 (167)12.2 (47)66.2 (511)33.8 (261)IgAN39.8 (39)53.1 (52)7.1 (7)66.3 (130)33.7 (66)Controls44.8 (449)44.2 (443)11.1 (111)66.8 (1341)33.2 (665)rs7747909G/AIgAV53.9 (209)39.4 (153)6.7 (26)73.6 (571)26.4 (205)IgAN41.1 (39)54.7 (52)4.2 (4)68.4 (130)31.6 (60)Controls53.0 (532)39.4 (395)7.6 (76)72.7 (1459)27.3 (547)Conclusion:Our results revealed that IgAV and IgAN share a similar IL17A association pattern.

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