Evidence map›Paper›PMID 26082496›Full record

ArticleNucleic acids research2015

Development of an intein-mediated split-Cas9 system for gene therapy.

Dong-Jiunn Jeffery Truong, Karin Kühner, Ralf Kühn, Stanislas Werfel, Stefan Engelhardt, Wolfgang Wurst, Oskar Ortiz

Open access · goldAbstract read
In one paragraph

Article in Nucleic acids research, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 215 papers.

0numbers the graph read from it
0cells of the map it votes in
215citing papers in PubMed
12.5field-weighted citation impact, top 1% 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

215 citing papers in PubMed, 373 citations in OpenAlex.

  1. Article
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  6. Considerations for early life genetic therapies in cystic fibrosis.American journal of physiology. Lung cellular and molecular physiology · 2026
    Review
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  8. Article
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  20. Molecular therapy. Nucleic acids · 2025
    Review

155 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

7 authors at 4 institutions in 1 country.

Dong-Jiunn Jeffery TruongInstitute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich 85764, Germany Institute of Developmental Genetics,Technische Universität München, Freising-Weihenstephan 85354, Germany.
Karin KühnerInstitute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich 85764, Germany.
Ralf KühnInstitute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich 85764, Germany Max Delbrück Center for Molecular Medicine (MDC), Berlin 13125, Germany.
Stanislas WerfelInstitute of Pharmacology and Toxicology. Technische Universität München, Munich 80802, Germany.
Stefan EngelhardtInstitute of Pharmacology and Toxicology. Technische Universität München, Munich 80802, Germany German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, Munich 80802, Germany.
Wolfgang WurstInstitute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich 85764, Germany Institute of Developmental Genetics,Technische Universität München, Freising-Weihenstephan 85354, Germany Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Munich 80336, Germany Munich Cluster for Systems Neurology (SyNergy) Adolf-Butenandt-Institut Ludwig-Maximilians-Universität München, Munich 81377, Germany oskar.ortiz@helmholtz-muenchen.de.
Oskar OrtizInstitute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich 85764, Germany oskar.ortiz@helmholtz-muenchen.de.
Technical University of Munich · DEHelmholtz Zentrum München · DELudwig-Maximilians-Universität München · DEMax Delbrück Center · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Using CRISPR/Cas9, it is possible to target virtually any gene in any organism. A major limitation to its application in gene therapy is the size of Cas9 (>4 kb), impeding its efficient delivery via recombinant adeno-associated virus (rAAV). Therefore, we developed a split-Cas9 system, bypassing the packaging limit using split-inteins. Each Cas9 half was fused to the corresponding split-intein moiety and, only upon co-expression, the intein-mediated trans-splicing occurs and the full Cas9 protein is reconstituted. We demonstrated that the nuclease activity of our split-intein system is comparable to wild-type Cas9, shown by a genome-integrated surrogate reporter and by targeting three different endogenous genes. An analogously designed split-Cas9D10A nickase version showed similar activity as Cas9D10A. Moreover, we showed that the double nick strategy increased the homologous directed recombination (HDR). In addition, we explored the possibility of delivering the repair template accommodated on the same dual-plasmid system, by transient transfection, showing an efficient HDR. Most importantly, we revealed for the first time that intein-mediated split-Cas9 can be packaged, delivered and its nuclease activity reconstituted efficiently, in cells via rAAV.

Indexed as

CRISPR-Cas SystemsInteinsCell LineCRISPR-Associated ProteinsDeoxyribonucleasesDependovirusGene TargetingGenetic TherapyHumansPlasmidsStreptococcus pyogenesTransfectionCRISPR-Associated ProteinsDeoxyribonucleases

Identifiers

PMID26082496
PMCPMC4513872
OpenAlexW1636931877

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.