Manuel Díaz-Llopis, Agustin Martinez-Berriotxoa, David Díaz Valle, Alfredo Adán, Miguel Cordero-Coma, Ricardo Blanco, Ana Márquez, Marina Begoña Gorroño Echebarría, Norberto Ortego-Centeno, José Manuel Martín-Villa, Alejandro Fonollosa, Enrique de Ramón, Javier Martín, Victor Llorenç, María José del Rio, María Carmen Cenit, José Luis García Serrano, J. Cañal, [Cénit,MC, Márquez,A, Martín,J] Instituto de Parasitología y Biomedicina López-Neyra, IPBLN, CSIC, Armilla, Granada, Spain. [Cordero-Coma,M] Ophthalmology Department, Hospital de León, Spain. [Fonollosa,A, Martínez-Berriotxoa,A] Internal Medicine Department, Hospital de Cruces, Bilbao, Spain. [Adán,A, and Llorenç,V] Ophthalmology Department, Hospital Clinic, Barcelona, Spain. [Díaz Valle,D] Ophthalmology Department, Hospital Clínico San Carlos, Madrid, Spain. [Blanco,R] Rheumatology Department, Hospital Marqués de Valdecilla, IFIMAV, Santander, Spain. [Cañal,J] Ophthalmology Department, Hospital Marqués de Valdecilla, Santander, Spain. [Díaz-Llopis,M] Ophthalmology Department, Hospital Universitario La Fe, Valencia, Spain. [García Serrano,JL] Ophthalmology Department, Hospital Clínico San Cecilio, Granada, Spain. [Ramón,E de] Internal Medicine Department, Hospital Carlos Haya, Málaga, Spain. [Rio,MJ del] Ophthalmology Department, Hospital Carlos Haya, Málaga, Spain. [Gorroño- Echebarría,MB] Ophthalmology Department, Hospital Universitario Principe de Asturias, Alcalá de Henares, Spain. [Martín-Villa,JM] Immunology Department, Facultad de Medicina, Universidad Complutense de Madrid, Spain. [Ortego-Centeno,N] Internal Medicine Department, Hospital Clínico San Cecilio, Granada, Spain.
Background Recently, different genetic variants located within the IL2/IL21 genetic region as well as within both IL2RA and IL2RB loci have been associated to multiple autoimmune disorders. We aimed to investigate for the first time the potential influence of the IL2/IL21, IL2RA and IL2RB most associated polymorphisms with autoimmunity on the endogenous non-anterior uveitis genetic predisposition. Methods A total of 196 patients with endogenous non-anterior uveitis and 760 healthy controls, all of them from Caucasian population, were included in the current study. The IL2/IL21 (rs2069762, rs6822844 and rs907715), IL2RA (2104286, rs11594656 and rs12722495) and IL2RB (rs743777) genetic variants were genotyped using TaqMan® allelic discrimination assays. Results A statistically significant difference was found for the rs6822844 (IL2/IL21 region) minor allele frequency in the group of uveitis patients compared with controls (P- value=0.02, OR=0.64 CI 95%=0.43-0.94) although the significance was lost after multiple testing correction. Furthermore, no evidence of association with uveitis was detected for the analyzed genetic variants of the IL2RA or IL2RB loci. Conclusion Our results indicate that analyzed IL2/IL21, IL2RA and IL2RB polymorphisms do not seem to play a significant role on the non-anterior uveitis genetic predisposition although further studies are needed in order to clear up the influence of these loci on the non-anterior uveitis susceptibility., The authors thank Sofía Vargas, Sonia Rodríguez and Gema Robledo (from Instituto de Parasitología y Biomedicina ‘López-Neyra’, CSIC, Spain) for their excellent technical assistance, and all the patients and healthy controls for kindly accepting their essential collaboration. Banco Nacional de ADN (University of Salamanca, Spain) and Biobanco Vasco para la Investigación (Fundación Vasca de Innovación e Investigación Sanitarias, Bizkaia, Spain) are thanked for supplying part of the samples.