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  • Title: Association of a CTLA-4 3' untranslated region (CT60) single nucleotide polymorphism with autoimmune thyroid disease in the Japanese population.
    Author: Ban Y, Tozaki T, Taniyama M, Tomita M, Ban Y.
    Journal: Autoimmunity; 2005 Mar; 38(2):151-3. PubMed ID: 16040335.
    Abstract:
    The etiology of the autoimmune thyroid diseases (AITDs), Graves' disease (GD) and Hashimoto's thyroiditis is largely unknown. However, genetic susceptibility is believed to play a major role. The cytotoxic T-lymphocyte antigen-4 (CTLA-4) gene, encoding a negative regulator of the T-lymphocyte immune response, had been reported to be associated and/or linked to AITD. Recently, AITD susceptibility in the Caucasians was mapped to the 6.1-kb 3'UTR of the CTLA-4 gene, in which the single-nucleotide polymorphism (SNP), CT60, was most strongly associated with AITD. In order to determine the association of the CTLA-4 gene with AITD in the Japanese, case-control association analysis for the CT60 of the CTLA-4 gene using 264 AITD patients and 179 healthy controls was done. The frequency of the disease-susceptible G allele of the CT60 of the Japanese control was higher than that of the Caucasians (72.6 vs. 52.3%). However, the G allele of the CT60 was associated with GD (84.0 vs. 72.6%, P=0.0008) and AITD (80.1 vs. 72.6%, P=0.009) in the Japanese. Furthermore, the G allele of the CT60 was associated with the increased risk for GD [P=0.004, odds ratio (OR)=2.0] and AITD (P=0.03,OR=1.6) in a recessive model. These results suggested that the CTLA-4 gene is involved in the susceptibility for GD and AITD in the Japanese.
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