Verificação da associação da variabilidade genética da Alfa-1-antitripsina e do fator de necrose tumoral com a asma brônquica

Abstract

Asthma is a complex chronic inflammatory disorder in which genetic and environmental factors are involved with the remodeling extracelullar matrix. The present study had aim to describe, through genetic methods, the prevalence of both S and Z alpha 1-antitrypsin alleles and the TNF-α (-308) genetic polymorphism, associated with the spectrum of asthma severity levels. A total of 110 asthmatics recruited random sample fora physical examination, determination of cutaneous sensibility with prick test, determination of respiratory parameters (forced expiratory volume in the first second and vital capacity) and DNA analysis by polymerase chain reaction and RFLP, completed this study. The patients was divided in two groups, 54 with moderated asthma and 56 with severe asthma. The genotype distribution of the deleterious variants of alpha 1 - antitrypsin may contribute to the severe persistent level of asthma. The TNF-α (-308 G/A) heterozygotes is not significantly associated with asthma.