Contribution of type 2 diabetes associated loci in the Arabic population from Tunisia: a case-control study

Bibliographic Details
Title: Contribution of type 2 diabetes associated loci in the Arabic population from Tunisia: a case-control study
Authors: Almawi Wassim Y, Kacem Maha, Chaieb Molka, Dechaume Aurélie, Vaillant Emmanuel, Cauchi Stéphane, Mtiraoui Nabil, Ezzidi Intissar, Froguel Philippe, Mahjoub Touhami, Vaxillaire Martine
Source: BMC Medical Genetics, Vol 10, Iss 1, p 33 (2009)
Publisher Information: BMC, 2009.
Publication Year: 2009
Collection: LCC:Internal medicine
LCC:Genetics
Subject Terms: Internal medicine, RC31-1245, Genetics, QH426-470
More Details: Abstract Background Candidate gene and genome-wide association studies have both reproducibly identified several common Single Nucleotide Polymorphisms (SNPs) that confer type 2 diabetes (T2D) risk in European populations. Our aim was to evaluate the contribution to T2D of five of these established T2D-associated loci in the Arabic population from Tunisia. Methods A case-control design comprising 884 type 2 diabetic patients and 513 control subjects living in the East-Center of Tunisia was used to analyze the contribution to T2D of the following SNPs: E23K in KCNJ11/Kir6.2, K121Q in ENPP1, the -30G/A variant in the pancreatic β-cell specific promoter of Glucokinase, rs7903146 in TCF7L2 encoding transcription factor 7-like2, and rs7923837 in HHEX encoding the homeobox, hematopoietically expressed transcription factor. Results TCF7L2-rs7903146 T allele increased susceptibility to T2D (OR = 1.25 [1.06–1.47], P = 0.006) in our study population. This risk was 56% higher among subjects carrying the TT genotype in comparison to those carrying the CC genotype (OR = 1.56 [1.13–2.16], P = 0.002). No allelic or genotypic association with T2D was detected for the other studied polymorphisms. Conclusion In the Tunisian population, TCF7L2-rs7903146 T allele confers an increased risk of developing T2D as previously reported in the European population and many other ethnic groups. In contrast, none of the other tested SNPs that influence T2D risk in the European population was associated with T2D in the Tunisian Arabic population. An insufficient power to detect minor allelic contributions or genetic heterogeneity of T2D between different ethnic groups can explain these findings.
Document Type: article
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Language: English
ISSN: 1471-2350
Relation: http://www.biomedcentral.com/1471-2350/10/33; https://doaj.org/toc/1471-2350
DOI: 10.1186/1471-2350-10-33
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  Data: <searchLink fieldCode="AR" term="%22Almawi+Wassim+Y%22">Almawi Wassim Y</searchLink><br /><searchLink fieldCode="AR" term="%22Kacem+Maha%22">Kacem Maha</searchLink><br /><searchLink fieldCode="AR" term="%22Chaieb+Molka%22">Chaieb Molka</searchLink><br /><searchLink fieldCode="AR" term="%22Dechaume+Aurélie%22">Dechaume Aurélie</searchLink><br /><searchLink fieldCode="AR" term="%22Vaillant+Emmanuel%22">Vaillant Emmanuel</searchLink><br /><searchLink fieldCode="AR" term="%22Cauchi+Stéphane%22">Cauchi Stéphane</searchLink><br /><searchLink fieldCode="AR" term="%22Mtiraoui+Nabil%22">Mtiraoui Nabil</searchLink><br /><searchLink fieldCode="AR" term="%22Ezzidi+Intissar%22">Ezzidi Intissar</searchLink><br /><searchLink fieldCode="AR" term="%22Froguel+Philippe%22">Froguel Philippe</searchLink><br /><searchLink fieldCode="AR" term="%22Mahjoub+Touhami%22">Mahjoub Touhami</searchLink><br /><searchLink fieldCode="AR" term="%22Vaxillaire+Martine%22">Vaxillaire Martine</searchLink>
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  Data: BMC Medical Genetics, Vol 10, Iss 1, p 33 (2009)
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  Data: Abstract Background Candidate gene and genome-wide association studies have both reproducibly identified several common Single Nucleotide Polymorphisms (SNPs) that confer type 2 diabetes (T2D) risk in European populations. Our aim was to evaluate the contribution to T2D of five of these established T2D-associated loci in the Arabic population from Tunisia. Methods A case-control design comprising 884 type 2 diabetic patients and 513 control subjects living in the East-Center of Tunisia was used to analyze the contribution to T2D of the following SNPs: E23K in KCNJ11/Kir6.2, K121Q in ENPP1, the -30G/A variant in the pancreatic β-cell specific promoter of Glucokinase, rs7903146 in TCF7L2 encoding transcription factor 7-like2, and rs7923837 in HHEX encoding the homeobox, hematopoietically expressed transcription factor. Results TCF7L2-rs7903146 T allele increased susceptibility to T2D (OR = 1.25 [1.06–1.47], P = 0.006) in our study population. This risk was 56% higher among subjects carrying the TT genotype in comparison to those carrying the CC genotype (OR = 1.56 [1.13–2.16], P = 0.002). No allelic or genotypic association with T2D was detected for the other studied polymorphisms. Conclusion In the Tunisian population, TCF7L2-rs7903146 T allele confers an increased risk of developing T2D as previously reported in the European population and many other ethnic groups. In contrast, none of the other tested SNPs that influence T2D risk in the European population was associated with T2D in the Tunisian Arabic population. An insufficient power to detect minor allelic contributions or genetic heterogeneity of T2D between different ethnic groups can explain these findings.
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