Open Access Highly Accessed Research article

Common polymorphisms of calpain-10 and the risk of Type 2 Diabetes in a Tunisian Arab population: a case-control study

Intissar Ezzidi1, Amira Turki1, Safia Messaoudi1, Molka Chaieb3, Maha Kacem4, Ghada M Al-Khateeb5, Touhami Mahjoub1, Wassim Y Almawi5 and Nabil Mtiraoui12*

Author Affiliations

1 Research Unit of Biology and Genetics of Hematological and Auto-immune diseases, Faculty of Pharmacy of Monastir, University of Monastir, Tunisia

2 Higher Institute of Biotechnology of Monastir, University of Monastir, Tunisia

3 Endocrinology and Diabetic Service, CHU Farhat Hached of Sousse, Tunisia

4 Nephrology and Internal Medicine Service, CHU Fatouma Bourguiba, Monastir, Tunisia

5 Dept. Medical Biochemistry, Arabian Gulf University, Manama, Bahrain

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BMC Medical Genetics 2010, 11:75  doi:10.1186/1471-2350-11-75

Published: 15 May 2010

Abstract

Background

Genetic variations in the calpain-10 gene (CAPN10), in particular the at-risk diplotype (112/121), were previously implicated with increased risk of type 2 diabetes (T2D).

Methods

We examined the association of CAPN10 UCSNP-43 (rs3792267), UCSNP-19 (rs3842570), and UCSNP-63 (rs5030952) SNPs with T2D in 917 Tunisian T2D patients and 748 non-diabetic controls. CAPN10 genotyping was done by PCR-RFLP.

Results

Enrichment of UCSNP-19 2R (minor) allele and 2R/2R genotype was found in T2D patients; the allele and genotype distribution of UCSNP-43 and UCSNP-63 alleles and genotypes were not significantly different between patient groups and non-diabetic control subjects. Regression analysis demonstrated progressive increases in T2D risk in 3R/2R [OR (95% CI) = 1.35 (1.08 - 1.68)] and 2R/2R [OR (95% CI) = 1.61 (1.20 - 2.18)] genotypes. Of the six haplotypes detected, enrichment of haplotype 111 (UCSNP-43/UCSNP-19/UCSNP-63) was seen in patients (Pc = 0.034); the distribution of the other haplotypes was comparable between patients and control subjects; neither haplotype 211 nor haplotype 212 was observed. Furthermore, the frequency of all CAPN10 diplotypes identified, including the "high-risk diplotype (112/121) reported for Mexican-Americans and Northern Europeans, were comparable between patients and controls.

Conclusions

CAPN10 UCSNP-19 variant, and the 111 haplotype contribute to the risk of T2D in Tunisian subjects; no significant associations between CAPN10 diplotypes and T2D were demonstrated for Tunisians.