Phylogeny and molecular genetic parameters of different stages of hepatitis B virus infection in patients from the Brazilian Amazon

Phylogeny and molecular genetic parameters of different stages of hepatitis B virus infection in... A fragment of 600 bp of the gene which codes for the surface antigen of hepatitis B virus (HBV) was amplified and sequenced from patients who were born in five states of the Brazilian Amazon (Amazonas, Pará, Acre, Rondônia and Tocantins). A total of 44 sequences were used for the estimation of molecular genetic parameters and phylogenetic analyses. Compared with patients who were asymptomatic, those who had acute hepatitis and chronic liver disease had higher levels of genetic variability and higher rates of nucleotide substitutions. The analysis of transition and transversion substitutions showed that transition-type substitutions predominated. In chronic liver disease carriers, transversion-type substitutions showed phylogenetic saturation. In general, all of the analyses carried out in this study showed an association between patterns of changes in molecular genetic parameters and the stage of disease progression. Phylogenetic analysis using the HKY85 model of evolution identified 41 individuals as genotype A, suggesting its predominance in the Amazon region, one individual as genotype C, and one individual closely related to genotypes E and F. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Virology Springer Journals

Phylogeny and molecular genetic parameters of different stages of hepatitis B virus infection in patients from the Brazilian Amazon

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Publisher
Springer Vienna
Copyright
Copyright © 2008 by Springer-Verlag
Subject
Biomedicine; Infectious Diseases; Medical Microbiology ; Virology
ISSN
0304-8608
eISSN
1432-8798
D.O.I.
10.1007/s00705-008-0053-6
Publisher site
See Article on Publisher Site

Abstract

A fragment of 600 bp of the gene which codes for the surface antigen of hepatitis B virus (HBV) was amplified and sequenced from patients who were born in five states of the Brazilian Amazon (Amazonas, Pará, Acre, Rondônia and Tocantins). A total of 44 sequences were used for the estimation of molecular genetic parameters and phylogenetic analyses. Compared with patients who were asymptomatic, those who had acute hepatitis and chronic liver disease had higher levels of genetic variability and higher rates of nucleotide substitutions. The analysis of transition and transversion substitutions showed that transition-type substitutions predominated. In chronic liver disease carriers, transversion-type substitutions showed phylogenetic saturation. In general, all of the analyses carried out in this study showed an association between patterns of changes in molecular genetic parameters and the stage of disease progression. Phylogenetic analysis using the HKY85 model of evolution identified 41 individuals as genotype A, suggesting its predominance in the Amazon region, one individual as genotype C, and one individual closely related to genotypes E and F.

Journal

Archives of VirologySpringer Journals

Published: May 1, 2008

References

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