International Journal of Medical Sciences

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Int J Med Sci 2006; 3(1):14-20. doi:10.7150/ijms.3.14

Research Paper

Correlations of HBV Genotypes, Mutations Affecting HBeAg Expression and HBeAg/ anti-HBe Status in HBV Carriers

Chee Kent Lim1 2, Joanne Tsui Ming Tan3, Jason Boo Siang Khoo4, Aarthi Ravichandran5, Hsin Mei Low6, Yin Chyi Chan1, So Har Ton1

1. School of Arts and Sciences, Monash University Malaysia, Petaling Jaya 46150, Malaysia
2. Faculty of Biotechnology, Malaysia University of Science and Technology, Petaling Jaya 47301, Malaysia
3. Discipline of Medicine, Blackburn Building D06, University of Sydney, NSW 2006, Australia
4. Institute of Molecular and Cell Biology, 61 Biopolis Drive (Proteos), 138673, Singapore
5. Department of Biological Sciences, Faculty of Sciences, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
6. Faculty of Medicine, Nursing and Health Sciences, Monash Immunology and Stem Cell Laboratories, Level 3, STRIP 1 - Building 75, Monash University, Wellington Road, Clayton, VIC 3800, Australia

Abstract

This study was carried out to determine the effects of hepatitis B virus genotypes, core promoter mutations (A1762G1764→T1762A1764) as well as precore stop codon mutations (TGG→TAG) on HBeAg expression and HBeAg/ anti-HBe status. Study was also performed on the effects of codon 15 variants (C1858/ T1858) on the predisposition of precore stop codon mutations (TGG→TAG). A total of 77 sera samples were analyzed. Fifty one samples were successfully genotyped of which the predominant genotype was genotype B (29/ 51, 56.9 %), followed by genotype C (16/ 51, 31.4 %). Co-infections by genotypes B and C were observed in four samples (7.8 %). To a lesser degree, genotypes D and E (2.0 % each) were also observed. For core promoter mutations, the prevalence was 68.8 % (53/ 77) for A1762G1764 wild-type and 14.3 % (11/ 77) for T1762A1764 mutant while 9.1 % (7/ 77) was co-infected by both strains. The prevalence of codon 15 variants was found to be 42.9 % (33/ 77) for T1858 variant and 16.9 % (13/ 77) for C1858 variant. No TAG mutation was found. In our study, no associations were found between genotypes (B and C) and core promoter mutations as well as codon 15 variants. Also no correlation was observed between HBeAg/ anti-HBe status with genotypes (B and C) and core promoter mutations.

Keywords: HBV, Genotypes, HBeAg, Core Promoter Mutation, 1858 Variants, Precore Stop Codon Mutation

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How to cite this article:
Lim CK, Tan JTM, Khoo JBS, Ravichandran A, Low HM, Chan YC, Ton SH. Correlations of HBV Genotypes, Mutations Affecting HBeAg Expression and HBeAg/ anti-HBe Status in HBV Carriers. Int J Med Sci 2006; 3(1):14-20. doi:10.7150/ijms.3.14. Available from http://www.medsci.org/v03p0014.htm