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  • Title: Gene polymorphisms of TNF-alpha-308 (G/A), IL-10(-1082) (G/A), IL-6(-174) (G/C) and IL-1Ra (VNTR) in Egyptian cases with type 1 diabetes mellitus.
    Author: Settin A, Ismail A, El-Magd MA, El-Baz R, Kazamel A.
    Journal: Autoimmunity; 2009 Jan; 42(1):50-5. PubMed ID: 19127455.
    Abstract:
    BACKGROUND: Type 1 diabetes (T1D) is a genetically conditioned autoimmune disease in which cytokines play an important role. Objectives. To check for the association of polymorphisms of cytokine genes with type 1 diabetes. Subjects. This work included 50 cases with T1D and 98 healthy individuals from the Nile Delta region of Egypt. Cases included 20 males and 30 females with a median age of 25 and range of 15-50 years. METHODS: DNA was amplified using PCR with sequence-specific primers for detection of polymorphisms related to tumor necrosis factor (TNF)-alpha(- 308) (G/A), interleukin (IL)-10(- 1082) (G/A), IL-6(- 174) (G/C), and IL-1Ra (VNTR). RESULTS: Cases with T1D showed significant higher frequency of genotypes of TNF-alpha(- 308) AA (p < 0.001, odds ratio (OR) = 7.91), IL-6-17CC (p < 0.05, OR = 3.36) and IL-1Ra A1A1 (p < 0.05, OR = 3.68) with significant lower frequencies of TNF-alpha(- 308) GA, and IL-1Ra A1A2 genotypes (p < 0.001 and < 0.05, respectively). They also showed significant higher frequency of TNF-alpha(- 308) allele A (p < 0.05, OR = 2.0), IL-1Ra allele A1 (p < 0.05, OR = 2.98) with a significant lower frequency of TNF-alpha(- 308) G allele and IL-1Ra A2 allele (p < 0.05). No significant difference was detected among cases in relation to IL-10(- 1082) (G/A) genotypes or alleles nor in relation to age, sex, consanguinity or family history of the disease. CONCLUSIONS: Polymorphisms related to TNF-alpha and IL-1Ra genes may be considered genetic markers for T1D among Egyptians with a potential impact on family counseling and management.
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