Evidence map›Paper›PMID 20824087›Full record

ArticlePLoS pathogens2010

Generation of covalently closed circular DNA of hepatitis B viruses via intracellular recycling is regulated in a virus specific manner.

Josef Köck, Christine Rösler, Jing-Jing Zhang, Hubert E Blum, Michael Nassal, Christian Thoma

Open access · goldAbstract read
In one paragraph

Article in PLoS pathogens, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 80 papers.

0numbers the graph read from it
0cells of the map it votes in
80citing papers in PubMed
3.8field-weighted citation impact, top 7% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

80 citing papers in PubMed, 143 citations in OpenAlex.

  1. Review
  2. Hepatitis B virus covalently closed circular DNA formation in murine hepatic cells uncovers a late entry block.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  3. Article
  4. DNA synthesis inside the hepatitis B virus creates a high-energy spool.bioRxiv : the preprint server for biology · 2026
    Article
  5. Hepatitis B Virus Nucleocapsid Assembly.Journal of molecular biology · 2025
    Review
  6. Article
  7. Review
  8. Article
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  12. Review
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20 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 1 institution in 1 country.

Josef KöckDepartment of Medicine II, University Hospital of Freiburg, Freiburg, Germany.
Christine Rösler
Jing-Jing Zhang
Hubert E Blum
Michael Nassal
Christian Thoma
University Medical Center Freiburg · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Persistence of hepatitis B virus (HBV) infection requires covalently closed circular (ccc)DNA formation and amplification, which can occur via intracellular recycling of the viral polymerase-linked relaxed circular (rc) DNA genomes present in virions. Here we reveal a fundamental difference between HBV and the related duck hepatitis B virus (DHBV) in the recycling mechanism. Direct comparison of HBV and DHBV cccDNA amplification in cross-species transfection experiments showed that, in the same human cell background, DHBV but not HBV rcDNA converts efficiently into cccDNA. By characterizing the distinct forms of HBV and DHBV rcDNA accumulating in the cells we find that nuclear import, complete versus partial release from the capsid and complete versus partial removal of the covalently bound polymerase contribute to limiting HBV cccDNA formation; particularly, we identify genome region-selectively opened nuclear capsids as a putative novel HBV uncoating intermediate. However, the presence in the nucleus of around 40% of completely uncoated rcDNA that lacks most if not all of the covalently bound protein strongly suggests a major block further downstream that operates in the HBV but not DHBV recycling pathway. In summary, our results uncover an unexpected contribution of the virus to cccDNA formation that might help to better understand the persistence of HBV infection. Moreover, efficient DHBV cccDNA formation in human hepatoma cells should greatly facilitate experimental identification, and possibly inhibition, of the human cell factors involved in the process.

Indexed as

Active Transport, Cell NucleusAnimalsCell NucleusDNA, CircularDNA, ViralGenome, ViralHepadnaviridae InfectionsHepatitis BHepatitis B virusHepatitis B Virus, DuckHepatitis, Viral, AnimalHumansImmunoprecipitationPolymerase Chain ReactionRecyclingVirionDNA, CircularDNA, Viral

Identifiers

PMID20824087
PMCPMC2932716
OpenAlexW1990662760

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.