Abstract

MORAN, YEINMY et al. Distribution of Interleukin-1 Genetic Polymorphisms in Central-Western Region Individuals of Venezuela. Acta biol.Colomb. [online]. 2009, vol.14, n.1, pp.185-194. ISSN 0120-548X.

The cytokines belonging to the family of interleukin-1 (IL-1) are encoded by three different genes: IL-1A, IL-1B, and IL-1RN, which encode for IL-1α, IL-1β and the endogenous receptor antagonist for IL-1 (IL-1Ra), respectively. IL-1α and IL-1β operate as pro-inflammatory cytokines, while the IL-1Ra as anti-inflammatory. It has been reported several biallelic polymorphisms in the genes of IL-1B, including IL-1B-511(C/T) and IL-1B+3954(C/T), while IL-1RN presents in intron 2 a penta-allelic VNTR polymorphism. The functionally relevant polymorphisms of these genes have been correlated with a wide range of chronic inflammatory and autoimmune conditions, as well as cancer. In order to determine the distribution of these polymorphisms in the Central-Western region of Venezuela, 100 unrelated apparently healthy individuals were studied. DNA was extracted from peripheral blood, and proceded to the characterization of polymorphisms IL-1B-511 and IL-1B +3954 by PCR-RFLP and VNTR IL-1RN by PCR. Allelic and genotypic frequencies were determined awith the program Arlequin v. 2.0. There was a predominance of T allele (52%) and the C allele (82%) for IL-1B-511 and IL-1B +3954, respectively. While for IL-1RN the more frequent genotypes were 1/1 (47%) and 1/2 (41%). We compare the results with the population frequencies found in other countries, highlighting differences with significant populations of different ethnic origin. These results could provide a valuable reference for future studies of association with cancer and inflammatory diseases in Venezuela.

Keywords : Interleukin-1, IL-1B, IL-1RN; genetic polymorphisms.

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