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CTLA-4 and MDR1 polymorphisms increase the risk for ulcerative colitis: A meta-analysis
Jia-Jun Zhao1, Di Wang1, Hui Yao1
1Jia-Jun Zhao, Di Wang, Hui Yao, Da-Wei Sun, Hong-Yu Li, Department of Gastroenterology, the General Hospital of Shenyang Military Region, Shenyang 110016, Liaoning Province, China.
Genetic variations in cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) and multi-drug resistance 1 (MDR1) genes are associated with an increased risk of ulcerative colitis (UC). Specific single nucleotide polymorphisms (SNPs) in CTLA-4 and MDR1 may contribute to UC development.
Area of Science:
- Genetics and Immunology
- Gastroenterology
Background:
- Ulcerative colitis (UC) is a chronic inflammatory bowel disease with complex etiology.
- Genetic factors are implicated in UC pathogenesis, influencing immune responses and drug metabolism.
Purpose of the Study:
- To investigate the association between specific polymorphisms in the cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) and multi-drug resistance 1 (MDR1) genes and the risk of developing UC.
- To conduct a meta-analysis of existing studies to determine the overall correlation.
Main Methods:
- A comprehensive literature search was performed across multiple databases (PubMed, EMBASE, Web of Science, etc.) for relevant case-control studies.
- Eligible studies were assessed for quality, and data were meta-analyzed using Comprehensive Meta-analysis 2.0 software.
- Odds ratios (OR) with 95% confidence intervals (CI) were calculated to evaluate the association between gene polymorphisms and UC risk.
Main Results:
- Twelve case-control studies involving 1860 UC patients and 2663 healthy controls were included.
- CTLA-4 gene single nucleotide polymorphisms (SNPs) rs3087243 G > A and rs231775 G > A were found to significantly increase UC risk.
- MDR1 gene SNP rs1045642 C > T also demonstrated a significant association with increased UC risk.
Conclusions:
- Specific SNPs in the CTLA-4 gene (rs3087243 G > A and rs231775 G > A) and the MDR1 gene (rs1045642 C > T) are associated with an elevated risk of ulcerative colitis.
- These findings highlight the role of genetic variations in CTLA-4 and MDR1 in UC susceptibility.
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