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Type: Artigo de periódico
Title: Family-based association of HLA class II alleles and haplotypes with type I diabetes in Brazilians reveals some characteristics of a highly diversified population
Author: Volpini, WMG
Testa, GV
Marques, SBD
Alves, LI
Silva, MER
Dib, SA
Guerra, G
Paulino, MFVM
Marini, SHVL
Persoli, LBL
Caillat-Zucman, S
Abstract: The association of HLA class II haplotypes with type I diabetes was analyzed in 56 Southeastern Brazilian families using affected family-based controls (AFBAC) method. DRB1-DQA1-DQB1 alleles were determined by polymerase chain reaction/sequence-specific primer genotyping. This study first revealed the great haplotype diversity of Brazilians (65 different haplotypes even with incomplete DRB1 subtyping), probably due to the admixture of Africans genes with European and Amerindian genes in this population. The results revealed increased frequencies of the DRB1*03-DQA1*0501-DQB1*02 and DRB1*0401-DQA1*03-DQB1*0302 haplotypes in the patient group The highest risk for type I diabetes was associated with the heterozygote DRB1*03/*04 genotype as largely reported, and DRB1*03/X and DRB1*04/Y genotypes conferred a significant, but much lower disease risk. Protection from type I diabetes revealed some peculiarities in Southeastern Brazilians: a lack of significant protecting effect of the DRB1*1501-DQA1*0102-DQB1*0602 haplotype, and an apparent protection conferred by the DRB1*13-DQB1*0301, DRB1*11-DQB1*0301, and DRB1*01-DQB1*0501 two-locus haplotypes. The risk to type I diabetes in the highly diversified Southeastern Brazilians evidenced specific information to the prediction of the disease in this region of the country. (C) American Society for Histocompatibility and Immunogenetics, 2001. Published by Elsevier Science Inc.
Subject: type I diabetes
HLA association
affected family-based control method
Brazilian population
Country: EUA
Editor: Elsevier Science Inc
Citation: Human Immunology. Elsevier Science Inc, v. 62, n. 11, n. 1226, n. 1233, 2001.
Rights: fechado
Identifier DOI: 10.1016/S0198-8859(01)00323-8
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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