Evidence map›Paper›PMID 32144253›Full record

ArticleNature communications2020

Blackjack mutations improve the on-target activities of increased fidelity variants of SpCas9 with 5'G-extended sgRNAs.

Péter István Kulcsár, András Tálas, Eszter Tóth, Antal Nyeste, Zoltán Ligeti, Zsombor Welker, Ervin Welker

Abstract read
In one paragraph

Article in Nature communications, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.

0numbers the graph read from it
0cells of the map it votes in
30citing papers in PubMed
–field-weighted citation impact
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

30 citing papers in PubMed.

  1. Article
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  6. Modulation of CRISPR-Cas9 Cleavage with an Oligo-Ribonucleoprotein Design.Chembiochem : a European journal of chemical biology · 2025
    Article
  7. Review
  8. Article
  9. Article
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  11. Article
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  15. CRISPR/Cas9 systems: Delivery technologies and biomedical applications.Asian journal of pharmaceutical sciences · 2023
    Review
  16. Article
  17. Article
  18. Review
  19. Review
  20. Article
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.

Péter István KulcsárInstitute of Enzymology, Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Budapest, H-1117, Hungary. kulcsar.peter.istvan@ttk.mta.hu.ORCID http://orcid.org/0000-0002-7783-5108
András TálasInstitute of Enzymology, Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Budapest, H-1117, Hungary.
Eszter TóthInstitute of Enzymology, Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Budapest, H-1117, Hungary.
Antal NyesteInstitute of Enzymology, Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Budapest, H-1117, Hungary.
Zoltán LigetiInstitute of Enzymology, Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Budapest, H-1117, Hungary.
Zsombor WelkerBiospiral-2006 Ltd, Szeged, H-6726, Hungary.
Ervin WelkerInstitute of Enzymology, Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Budapest, H-1117, Hungary. welker.ervin@ttk.mta.hu.ORCID http://orcid.org/0000-0001-9874-8794

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Increased fidelity mutants of the SpCas9 nuclease constitute the most promising approach to mitigating its off-target effects. However, these variants are effective only in a restricted target space, and many of them are reported to work less efficiently when applied in clinically relevant, pre-assembled, ribonucleoprotein forms. The low tolerance to 5'-extended, 21G-sgRNAs contributes, to a great extent, to their decreased performance. Here, we report the generation of Blackjack SpCas9 variant that shows increased fidelity yet remain effective with 21G-sgRNAs. Introducing Blackjack mutations into previously reported increased fidelity variants make them effective with 21G-sgRNAs and increases their fidelity. Two "Blackjack" nucleases, eSpCas9-plus and SpCas9-HF1-plus are superior variants of eSpCas9 and SpCas9-HF1, respectively, possessing matching on-target activity and fidelity but retaining activity with 21G-sgRNAs. They facilitate the use of existing pooled sgRNA libraries with higher specificity and show similar activities whether delivered as plasmids or as pre-assembled ribonucleoproteins.

Indexed as

CRISPR-Associated Protein 9CRISPR-Cas SystemsCrystallography, X-RayGene EditingHEK293 CellsHumansMutagenesisMutationProtein Structure, SecondaryRNA, Guide, CRISPR-Cas SystemsStructure-Activity RelationshipCas9 endonuclease Streptococcus pyogenesCRISPR-Associated Protein 9RNA, Guide, CRISPR-Cas Systems

Identifiers

PMID32144253
PMCPMC7060260

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Registered trials

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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.