The persistence in the liver of residual duck hepatitis B virus covalently closed circular DNA is not dependent upon new viral DNA synthesis.
Residual hepatitis B virus (HBV) DNA can be detected following the resolution of acute HBV infection. Our previous work using duck hepatitis B virus (DHBV) infected ducks, indicated that ~80% of residual DHBV DNA in the liver is in the covalently closed circular DNA (cccDNA) form, suggesting that viral DNA synthesis is suppressed. The current study asked more directly if maintenance of residual DHBV cccDNA is dependent upon ongoing viral DNA synthesis. Ducks that recovered from acute DHBV infection were divided into 2 groups and treated with the antiviral drug, Entecavir (ETV), or placebo. No major differences in the stability of cccDNA or levels of residual cccDNA were observed in liver biopsy tissues taken 95 days apart from ETV treated and placebo control ducks. The data suggest that residual DHBV cccDNA is highly stable and present in a cell population with a rate of turnover similar to normal, uninfected hepatocytes.
Reaiche
Georget Y
GY
School of Molecular and Biomedical Science, University of Adelaide, Adelaide, SA 5005, Australia. georget.reaiche@adelaide.edu.au
Le Mire
Marc F
MF
Mason
William S
WS
Jilbert
Allison R
AR
D000818:Animals; D000998:Antiviral Agents / Q000008:administration & dosage; D004261:DNA Replication / Q000187:drug effects; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004372:Ducks; D006147:Guanine / Q000008:administration & dosage / Q000031:analogs & derivatives; D018347:Hepadnaviridae Infections / Q000188:drug therapy / Q000662:veterinary* / Q000821:virology; D015611:Hepatitis B Virus, Duck / Q000737:chemistry / Q000187:drug effects / Q000235:genetics* / Q000502:physiology; D006524:Hepatitis, Viral, Animal / Q000188:drug therapy / Q000821:virology*; D008099:Liver / Q000187:drug effects / Q000821:virology*; D009690:Nucleic Acid Conformation / Q000187:drug effects; D011201:Poultry Diseases / Q000188:drug therapy / Q000821:virology*
D000998:Antiviral Agents; D004279:DNA, Viral; C413685:entecavir; D006147:Guanine