Abstract
Objective
To analyze the distribution of HLA-B alleles and to investigate their contribution in the susceptibility to spondyloarthropathies (SpA) in a sample population from Zambia, in order to determine a relationship between some HLA-B alleles and development of ankylosing spondylitis (AS), reactive arthritis (ReA), or undifferentiated SpA (uSpA).
Methods
We selected 72 patients with SpA and found that 46 had uSpA, 23 ReA, and 3AS.We also selected 92 matched controls; 55 of these had human immunodeficiency virus type I (HIV-I) infection.
Results
We found a significant increase in the rate of uSpA and ReA with features of Reiter’s syndrome (RS) in HIV-positive individuals who carried the HLA-B*5703 allele (pc < 0.0001 and pc < 0.001, respectively). Among the significant new findings identified were the presence of B*1403 in 2 of the 3 AS patients (pc < 0.05, OR 47), confirming previous data in the Togolese population.
Conclusion
The presence of B*5703 and HIV infection may not affect susceptibility to AS and ReA, but they do show an important influence in uSpA and RS. Our findings confirm that HLA-B* 1403 is the only factor to increase the risk of AS in a sub-Saharan African population, whereas HLA-B27 was virtually absent in patients with AS.
Key Indexing Terms:Footnotes
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R. Díaz-Peña, BSc; M.A. Blanco-Gelaz, PhD; A. López-Vazquez, MD; B. Suárez-Álvarez, BSc; C. López-Larrea, PhD, Department of Immunology, Hospital Universitario Central de Asturias; P. Njobvu, MD, University Teaching Hospital, Lusaka.
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Supported in part by the Spanish Ministry of Education and Science (grant SAF-2004/02669) and by the Fundación para el Fomento en Asturias de la Investigación Científica y Aplicada y la Tecnología (grant PC-07/006).
- Accepted for publication July 7, 2008.