Differences in the genotypes and plasma concentrations of the INTERLEUKIN-1 receptor antagonist in black and white South African asthmatics and control subjects |
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Authors: | Pillay V Gaillard M C Halkas A Song E Dewar J B |
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Institution: | Department of Medicine and Department of Paediatrics, University of the Witwatersrand, 7 York Road, Johannesburg, Parktown, South Africa. |
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Abstract: | The allelic frequency of a variable tandem repeat (VNTR) polymorphism in intron 2 of the IL-1 Ra gene was studied in black and white patients with asthma as well as control individuals. The plasma IL-1 Ra concentration was also determined in asthmatics and compared to control individuals. The 410-bp allele of the IL-1 Ra was significantly increased in all black subjects (90%) as compared to all white subjects (74%, P<0.0001), while the 240-bp allele was significantly reduced in all black subjects (11%) as compared to all white subjects (27%, P<0.0001). There was no difference in the frequency of the VNTR of the IL-1 Ra between black asthmatics and black controls and between white asthmatics and white controls. The IL-1 Ra levels were significantly increased in black and white patients with severe or moderate asthma as compared to patients with mild asthma. Increased plasma concentrations of the IL-1 Ra was found to be associated with disease severity in all asthmatic patients. |
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