Análise molecular e implicações biológicas do vírus da Hepatite B, em pacientes naturais do estado do Amazonas

Abstract

The hepatitis B virus (HBV) is an agent of universal distribution which produces in humanity both the gaud and chronic infection. According to the World health organization (WHO) approximately 30% of world population, or about 2 billion of the people, are infected by the HBV. Of these, more than 350, million have become chronic patients. The molecular analysis of the genome HBV has allowed the identification of different genotypes as well as the main mutations which are present in its genome. The present study had as objective to make the sequence of S and C of HBV isolated from different samples born in the Amazon State and to analyze the frequency of mutations in these genes related with the disease evolution. Samples of 80 patients positive for the HBV were obdied. From these, 60 were born on Manaus and 20 on the urban zone of Labrea city, AM.. The amplification of the S gene and C gene by PCR showed that from 80 samples that were analyzed, 68 (85%) were DNA-HBV positive. The filogenetic analyze identified 3 genotypic groups A, D and F. The prevalent genotype was the A type 40/51 (78,4%), followed by F genotype, (7%) and D 2/51 (3,9%) as walles two undetermined sequences. The A genotype was the most frequent in the samples obtained of people who were born in Manaus, while the F genotype was prevalent in the samples of people from the interior of the Amazon State. Considering the mutations, a very low frequency of mutations related with the development of the disease both in the S and C gene was observed.