Saudi Journal of Gastroenterology
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Year : 2009  |  Volume : 15  |  Issue : 1  |  Page : 29-34

Association between CTLA-4 gene promoter (49 A/G) in exon 1 polymorphisms and inflammatory bowel disease in the Tunisian population

Charles Nicolle Hospital, Immunology laboratory Ch. Nicolle Hospital, Tunis-1006, Tunis, Tunisia

Correspondence Address:
Khaled Ayed
Laboratory of Immunology, EPS Charles Nicolle, Bd 9 Avril 1006 Tunis
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1319-3767.43285

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Background/Aim: To investigate the possible association between the polymorphism of the CTLA-4 exon 1 +49 A/G and susceptibility to Crohn's disease (CD) and ulcerative colitis (UC) in the Tunisian population. Methods: The +49 A/G dimorphism was analyzed in 119 patients with CD, 65 patients with UC, and 100 controls by the polymerase chain reaction-restriction fragment length polymorphism method. Results: Significantly higher frequencies of the CTLA-4 +49A allele and A/A homozygous individuals were observed in patients with CD when compared with controls (pc = 0.0023 and pc = 0.0003, respectively). Analysis of CTLA-4 A/G polymorphism with respect to sex in CD showed a significant difference in A/A genotypes between female patients and controls (pc = 0.0001 and pc = 0.038, respectively). There were no differences in the subgroups of patients with CD. Conclusions: Forty-nine A alleles and AA genotype are associated with CD susceptibility in Tunisians. Other genes involved in the T-cell regulation remain strong candidates for IBD susceptibility and require further investigation.

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