Cited by 217Hepatitis B Virus StudiesCRISPR and Genetic EngineeringVirus-based gene therapy research

Inactivation of hepatitis B virus replication in cultured cells and in vivo with engineered transcription activator-like effector nucleases

Open access
Bloom, Kristie, Ely, Abdullah, Mussolino, Claudio, Cathomen, Toni, Arbuthnot, Patrick·2013·Molecular Therapy

Abstract

Chronic hepatitis B virus (HBV) infection remains an important global health problem. Stability of the episomal covalently closed circular HBV DNA (cccDNA) is largely responsible for the modest curative efficacy of available therapy. Since licensed anti-HBV drugs have a post-transcriptional mechanism of action, disabling cccDNA is potentially of therapeutic benefit. To develop this approach, we engineered mutagenic transcription activator-like effector nucleases (TALENs) that target four HBV-specific sites within the viral genome. TALENs with cognate sequences in the S or C open-reading frames (ORFs) efficiently disrupted sequences at the intended sites and suppressed markers of viral replication. Following triple transfection of cultured HepG2.2.15 cells under mildly hypothermic conditions, the S TALEN caused targeted mutation in ~35% of cccDNA molecules. Markers of viral replication were also inhibited in vivo in a murine hydrodynamic injection model of HBV replication. HBV target sites within S and C ORFs of the injected HBV DNA were mutated without evidence of toxicity. These findings are the first to demonstrate a targeted nuclease-mediated disruption of HBV cccDNA. Efficacy in vivo also indicates that these engineered nucleases have potential for use in treatment of chronic HBV infection.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1038/mt.2013.170

Cites

42 of 42 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • ZFNs and TALENs can cleave host genomes in a site-specific fashion and have been under investigation for specific degradation of HBV genomes in vitro and in vivo.

    “Two genome editing technologies, zinc finger nucleases (ZFNs) and transcription activator-like effector nucleases (TALENs), can cleave the host genomes in a site-specific fashion and have been under investigation for specific degradation of the HBV genomes in vitro and in vivo.8,9,10”
  • The CRISPR/Cas9 system was as effective as TALENs in mediating gene disruption in vitro, although its mutagenesis rate is lower (~5% by T7E1 and ~27% by clonal sequencing) in vivo.

    “Our study demonstrated that the CRISPR/Cas9 system was as effective as TALENs in mediating gene disruption in vitro, although its mutagenesis rate is lower (~5% by T7E1 and ~27% by clonal sequencing) in vivo.”
  • Previous studies reported that HBV-specific TALENs have a mutagenesis rate ranging between 30 and 70%.

    “Previous studies reported that HBV-specific TALENs have a mutagenesis rate ranging between 30 and 70%.9,10”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Bloom, K., Ely, A., Mussolino, C., Cathomen, T., & Arbuthnot, P.
Affiliations
  • University of the Witwatersrand (ZA)
  • University Medical Center Freiburg (DE)
Corresponding author
Arbuthnot, Patrick
Venue
Molecular Therapy
Publisher
Elsevier BV
Published
2013-10
Volume
21
Issue
10
Pages
1889-1897
ISSN
1525-0016 (ISSN-L)
OpenAlex
W2084686098
Cited by
217
References
42
Citations by year
2026: 4 · 2025: 6 · 2024: 4 · 2023: 18 · 2022: 11 · 2021: 10 · 2020: 16 · 2019: 17 · 2018: 12 · 2017: 28 · 2016: 33 · 2015: 37 · 2014: 19 · 2013: 1
FWCI
21.86
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Hepatitis B Virus Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
Keywords
hepatitis B virus, covalently closed circular DNA, TALEN, chronic hepatitis B, viral replication inhibition, targeted genome editing, hydrodynamic injection, mouse model, HepG2.2.15 cells
MeSH terms
Animals, Base Sequence, Cell Line, Deoxyribonucleases, Disease Models, Animal, DNA Replication, DNA, Circular, DNA, Viral, Genetic Vectors, Hepatitis B, Hepatitis B virus, Humans, Molecular Sequence Data, Transfection, Virus Replication, Protein Engineering, Genetic Therapy, Mutagenesis, Mice, Hep G2 Cells

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review