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Volume 102, Issue 11

characterization of six hepatitis B virus genotypes from clinical isolates using transfecting linear HBV genomes No Access

Abstract

Hepatitis B virus (HBV) infection is a global public health problem with about 257 million chronically infected people and over 887000 deaths annually. In this study, 32 whole HBV genomes of various genotypes were amplified from clinical isolates to create transfection clones. The clones were sequenced, and their biological properties characterized by transfecting linear HBV clones into HepG2 cells. We analysed the SPI and SPII promotor regions, X-gene, BCP/PC sequences, core, preS/S and HBV polymerase sequences. HBV clones analysed in this study revealed differential replication kinetics of viral nucleic acids and expression of proteins. Sequence analysis of HBV clones revealed mutations in preS1, preS2 and S genes; deletion and insertion and point mutations in BCP/PC region; including novel and previously reported mutations. Among the patient samples tested, HBV genotype B clones were more likely to have higher frequencies of mutations, while sub-genotype A1 and A2 clones tended to have fewer mutations. No polymerase drug resistant mutations were seen. HBeAg mutations were primarily in the BCP/PC region in genotype B, but core truncations were found in genotype E. S gene mutations affecting HBsAg expression and detection were seen in all genotypes except A2. Using an HBV clone with repetitive terminal sequences and a I restriction site allowed us to analyse HBV analyte production in cell culture and characterize the genetics of viral phenotypes using complete HBV genomes isolated from serum/plasma samples of infected patients.

  • Received:
  • Accepted:
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Keyword(s): clinical specimen , HBeAg , HBsAg , hepatitis B virus , mutations and transfection
© Microbiology Society
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2021-11-01
2024-05-08
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In vitro characterization of six hepatitis B virus genotypes from clinical isolates using transfecting linear HBV genomes
J. Gen. Virol. 102, 001675 (2021); https://doi.org/10.1099/jgv.0.001675
/content/journal/jgv/10.1099/jgv.0.001675
/content/journal/jgv/10.1099/jgv.0.001675
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