title: CREM variant rs17583959 conferred susceptibility to T1D risk in the Tunisian families.
abstract: Type 1 diabetes mellitus (T1D) is a chronic autoimmune disease caused by the destruction of insulin-producing pancreatic β-cells by autoreactive T cells. Studies in animal models, such as the non-obese diabetic (NOD) mouse reveal that this disease is under the control of several genes that encode molecules implicated in regulation of transcription factors and in T cell activation. In order to underline the role of the genes involved in this regulation pathways, we investigated, using the Sequenom MassARRAY platform, 13 single-nucleotide polymorphisms (SNPs) belonging to CREM, IRF5, STAT4, and STAT5a/b genes in 59 T1D Tunisian families. In the current study, we identified an association with rs17583959 (allele G; Z score=2.27; p=0.02; Genotype GG: score=1.96; p=0.04) of CREM gene. In LD analysis a strong LD between the 3 CREM variants (Block 1) was detected; rs2384352 was in complete LD with rs1148247. When haplotypes were constructed between CREM polymorphisms (rs1148247, rs17583959, rs2384352), AGA haplotype (H2) was significantly over-transmitted from parents to affected offspring (Z score=2.988; P=0.002) and may confer a risk for T1D disease. Whereas, AAG haplotype (H5) (Z score=-2.000; p=0.045) was less transmitted than expected to affected children suggesting its protective effect against T1D pathology. No significant association in IRF5, STAT4, and STAT5a/b genes were observed. In conclusion, this study shows an eventually involvement of CREM gene in the development of T1D pathology in Tunisian families. These facts are consistent with a major role for transcription factor genes involved in the immune pathways in the control of autoimmunity. Further researches of association and functional analysis across populations are needed to confirm these findings.
authors.affiliation: Immunology Department, Habib Bourguiba Hospital, University of Sfax, Tunisie. Electronic address: zouidi_ferjeni@yahoo.fr.
authors.forename: Ferjani
authors.initials: F
authors.lastname: Zouidi
authors.affiliation: Immunology Department, Habib Bourguiba Hospital, University of Sfax, Tunisie.
authors.forename: D
authors.initials: D
authors.lastname: Bouzid
authors.affiliation: Immunology Department, Habib Bourguiba Hospital, University of Sfax, Tunisie.
authors.forename: H
authors.initials: H
authors.lastname: Fourati
authors.affiliation: Immunology Department, Habib Bourguiba Hospital, University of Sfax, Tunisie.
authors.forename: R
authors.initials: R
authors.lastname: Fakhfakh
authors.affiliation: Pediatric Department, Hedi Chaker Hospital, Sfax, Tunisie.
authors.forename: T
authors.initials: T
authors.lastname: Kammoun
authors.affiliation: Pediatric Department, Hedi Chaker Hospital, Sfax, Tunisie.
authors.forename: M
authors.initials: M
authors.lastname: Hachicha
authors.affiliation: Instituto Gulbenkian de Ciência, Oeiras, Portugal.
authors.forename: C
authors.initials: C
authors.lastname: Penha-Gonçalves
authors.affiliation: Immunology Department, Habib Bourguiba Hospital, University of Sfax, Tunisie.
authors.forename: H
authors.initials: H
authors.lastname: Masmoudi
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D002648:Child; D002675:Child, Preschool; D051786:Cyclic AMP Response Element Modulator / Q000235:genetics*; D003922:Diabetes Mellitus, Type 1 / Q000453:epidemiology / Q000235:genetics*; D005190:Family; D005260:Female; D005787:Gene Frequency; D008040:Genetic Linkage; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D050835:Interferon Regulatory Factors / Q000235:genetics; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D050799:STAT5 Transcription Factor / Q000235:genetics; D014416:Tunisia; D055815:Young Adult
chemical_list: C497410:CREM protein, human; C431713:IRF5 protein, human; D050835:Interferon Regulatory Factors; D050799:STAT5 Transcription Factor; D051786:Cyclic AMP Response Element Modulator
keywords: CREM; Haplotype; IRF5; STAT5; Tunisia; Type 1 diabetes