Original Article

Associations of TNF-Α -308 and -238 Polymorphisms with Inflammatory Bowel Disease: A Case-Control Study and Meta-Analysis of Published Data

Abstract

Background: Inflammatory bowel disease (IBD) is a chronic relapsing-remitting inflammatory disease of the intestinal tract. Tumor necrosis factor-alpha (TNF-α) signaling plays a major role in the pathogenesis of IBD and is commonly targeted for therapeutic purposes. Results on the contribution of TNF-α -308 and -238 single nucleotide polymorphisms (SNP) to the susceptibility to IBD have been contradictory in different populations.

Methods: Allele frequency and genotype status of TNF-α -308 and -238 SNPs were investigated in 75 unrelated patients with IBD [40 Crohn’s disease (CD) and 35 ulcerative colitis (UC)] and 140 healthy controls by polymerase chain reaction with sequence-specific primers (PCR-SSP). We also conducted a systematic review and meta-analysis of the published reports.

Results: TNF-α -238 GG was detected at a higher frequency in CD and UC. TNF-α -308 GG was more frequently detected in UC compared to control. There was no significant association between TNF-α -238 or -308 gene polymorphisms and patients’ demography (i.e., gender and age) or disease phenotype (i.e., extraintestinal manifestations, treatment, activity index, age at onset, and duration of the disease). In the meta-analysis, TNF-α -238 (AA/AG) genotype tended to be less frequent in patients with UC compared to healthy controls. There was no association between TNF-α -238 gene polymorphisms (AA/AG or GG genotypes) and either form of IBD.

Conclusion: TNF-α -308 and -238 SNPs are associated with IBD in Iranian patients. The TNF-α -308 AA genotype is positively correlated with UC in this meta-analysis.

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IssueVol 8, No 2 (2025) QRcode
SectionOriginal Article
DOI https://doi.org/10.18502/igj.v8i2.18003
Keywords
Allele Frequency Crohn's Disease Inflammatory Bowel Disease Meta-Analysis Polymorphisms Ulcerative Colitis

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How to Cite
1.
Moosavi S, Shanker A, Sadr M, Soltani S, Shahkarami S, Farhadi E, Ebrahimi Daryani N, Baradaran Noveiry B, Najmi Varzaneh F, Bashashati M, Rezaei N. Associations of TNF-Α -308 and -238 Polymorphisms with Inflammatory Bowel Disease: A Case-Control Study and Meta-Analysis of Published Data. Immunol Genet J. 2025;8(2):236-247.