Characterization of the pleiotropic effects of the genotype G-specific 36-nucleotide insertion in the context of other hepatitis B virus genotypes.

Abstract:

:The pregenomic RNA (pgRNA) of hepatitis B virus (HBV) serves as the messenger for both core and P proteins, with the downstream P gene translated by ribosomal leaky scanning. HBV replication begins with packaging of the pgRNA and P protein into core protein particles, followed by conversion of RNA into DNA. Genotype G has a low replication capacity due to a low pgRNA level. It has a 36-nucleotide (nt) insertion in the 5' end of the core gene, adding 12 residues to the core protein. The insertion is needed to maintain efficient core protein expression and genome replication but causes inefficient virion secretion yet high maturity of virion DNA. In the present study, we confirmed that the 36-nt insertion had similar effects on core protein expression and virion secretion when it was introduced into genotype A and D clones but no impact on virion genome maturity. Surprisingly, the insertion impaired genome replication in both genotypes. Transcomplementation assays suggest that increased efficiency of core protein translation diminishes ribosomal scanning toward the downstream P gene. Indeed, mutating the core gene Kozak sequence restored core protein to lower levels but increased replication of the insertion mutant. Similar mutations impaired replication in genotype G. On the other hand, replacement of the core promoter sequence of genotype G with genotype A sequence increased pgRNA transcription and genome replication, implicating this region in the low replication capacity of genotype G. Why the 36-nt insertion is present in genotype G but absent in other genotypes is discussed.

journal_name

J Virol

journal_title

Journal of virology

authors

Gutelius D,Li J,Wands J,Tong S

doi

10.1128/JVI.05583-11

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

13278-89

issue

24

eissn

0022-538X

issn

1098-5514

pii

JVI.05583-11

journal_volume

85

pub_type

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