IL-23R mutation is associated with ulcerative colitis: A systemic review and meta-analysis
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Ling-Long Peng1, Ying Wang2, Feng-Ling Zhu1, Wang-Dong Xu3, Xue-Lei Ji1, Jing Ni4
1Department of Science and Education, The Second People’s Hospital of Wuhu, Wuhu, Anhui 241000, China
2Department of Environmental Health, Suzhou Municipal Center for Disease Prevention and Control, Suzhou, Jiangsu 215004, China
3Department of Rheumatology and Immunology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
4The Teaching Centre for Preventive Medicine, School of Public Health, Anhui Medical University, Hefei, Anhui 230032, China
Xue-Lei Ji, email: Jixueleiwh@163.com
Jing Ni, email: firstname.lastname@example.org
Keywords: meta-analysis, ulcerative colitis, polymorphism, susceptibility, IL-23R
Received: June 15, 2016 Accepted: November 12, 2016 Published: November 25, 2016
Objectives: Since a genome-wide association study revealed that Interleukin-23 receptor (IL-23R) gene is a candidate gene for Ulcerative Colitis (UC), many studies have investigated the association between the IL-23R polymorphisms and UC. However, the results were controversial. The aim of the study was to determine whether the IL-23R polymorphisms confer susceptibility to UC.
Methods: A systematic literature search was carried out to identify all potentially relevant studies. Pooled odds ratios (ORs) with 95% confidence intervals (CIs) were used to estimate the strength of association.
Results: A total of 33 studies in 32 articles, including 10,527 UC cases and 15,142 healthy controls, were finally involved in the meta-analysis. Overall, a significant association was found between all UC cases and the rs11209026A allele (OR = 0.665, 95% CI = 0.604~0.733, P < 0.001). Similarly, meta-analyses of the rs7517847, rs1004819, rs10889677, rs2201841, rs11209032, rs1495965, rs1343151 and rs11465804 polymorphisms also indicated significant association with all UC (all P < 0.05). Stratification by ethnicity revealed that the rs11209026, rs7517847, rs10889677, rs2201841 andrs11465804 polymorphisms were associated with UC in the Caucasian group, but not in Asians, while the rs1004819 and rs11209032 polymorphisms were found to be related to UC for both Caucasian and Asian groups. However, subgroup analysis failed to unveil any association between the rs1495965 and rs1343151 polymorphisms and UC in Caucasians or Asians.
Conclusions: The meta-analysis suggests significant association between IL-23R polymorphisms and UC, especially in Caucasians.
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