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Class-I human leukocyte alleles in leprosy patients from Southern Brazil.

Abstract

INTRODUCTION: The present study was designed to investigate a possible role of HLA (histocompatibility leucocyte antigen) class-I alleles (HLA-A, -B, and -C) in leprosy patients from Southern Brazil.

METHODS: Two hundred and twenty-five patients with leprosy and 450 individuals for the control group were involved in this research. HLA genotyping was performed through PCR-SSO protocols (One Lambda, USA); the frequency of these alleles was calculated in each group by direct counting, and the frequencies were then compared.

RESULTS: There was an association between HLA-A*11 (6.9% vs 4.1%, p=0.0345, OR=1.72, 95% CI=1.05-2.81), HLA-B*38 (2.7% vs. 1.1%, p=0.0402, OR=2.44, 95% CI=1.05-5.69), HLA-C*12 (9.4% vs. 5.4%, p=0.01, OR=1.82, 95% CI=1.17-2.82), and HLA-C*16 (3.1% vs. 6.5%, p=0.0124, OR=0.47, 95% CI=0.26-0.85) and leprosy per se. In addition, HLA-B*35, HLA-C*04, and HLA-C*07 frequencies were different between lepromatous (LL) and tuberculoid (TT) patients. However, after adjusting for the number of alleles compared, Pc values became nonsignificant.

CONCLUSIONS: Although our results do not support the previous findings that HLA class-I alleles play a role in leprosy pathogenesis, we suggest new studies because of the importance of the association between the HLA and KIR in the innate immune response to leprosy.

French Abstract
RESUMO INTRODUÇÃO: O presente estudo foi desenhado para investigar um possível papel para os alelos HLA (histocompatibility leucocyte antigen) de classe I (HLA-A, -B, and -C) em pacientes com hanseníase do sul do Brasil. MÉTODOS: Duzentos e vinte e cinco pacientes com hanseníase e 450 indivíduos para o grupo-controle foram envolvidos nesse estudo. O genótipo HLA foi determinado por protocolos PCR-SSO (One Lambda, USA) e, a frequência desses alelos foi calculada em cada grupo por contagem direta e, após, comparadas. RESULTADOS: Houve associação entre HLA-A*11 (6,9% vs 4,1%; p = 0,0345; OR = 1,72; CI = 1,05 - 2,81), HLA-B*38 (2,7% vs 1,1; p = 0,0402; OR = 2,44; CI 95% = 1,05-5,69), HLA-C*12 (9,4% vs 5,4%; p = 0,01; OR = 1,82; CI 95% = 1,17-2,82) e HLA-C*16 (3,1 vs 6,5%; p = 0,0124; OR = 0,47; CI 95% = 0,26-0,85) e hanseníase per se. Além disso, as frequências de HLA-B*35, HLA-C*04 e HLA-C*07 foram diferentes entre os pacientes com as formas lepromatosa (LL) e tuberculoide (TT). Contudo, após o ajuste para o número de alelos comparados, os valores de p se tornaram não significativos. CONCLUSÕES: Embora nossos resultados não sustentem as conclusões anteriores de que os alelos HLA de classe I desempenham um papel na associação com a patogênese da hanseníase, sugerimos novos estudos devido à importância da associação entre HLA e KIR na resposta imune inata à hanseníase. Palavras-chaves: Genes HLA de classe I. Hanseníase. Mycobacterium leprae. Susceptibilidade genética.

More information

Type
Journal Article
Author
Franceschi DSA
Tsuneto LT
Mazini PS
Sacramento WS
Reis PG
Rudnick CCC
Clementino SL
Sell AM
Visentainer JEL
Country
Brazil
Year of Publication
2011
Journal
Revista da Sociedade Brasileira de Medicina Tropical
Volume
44
Issue
5
Number of Pages
616-20
Date Published
2011 Oct
Language
eng
ISSN Number
1678-9849
DOI
10.1590/s0037-86822011000500018
Alternate Journal
Rev. Soc. Bras. Med. Trop.
Publication Language
eng