Evidence map›Paper›PMID 29431739›Full record

ArticleNature biotechnology2018

A highly specific SpCas9 variant is identified by in vivo screening in yeast.

Antonio Casini, Michele Olivieri, Gianluca Petris, Claudia Montagna, Giordano Reginato, Giulia Maule, Francesca Lorenzin, Davide Prandi, Alessandro Romanel, Francesca Demichelis and 2 more

Abstract read
In one paragraph

Article in Nature biotechnology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 285 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
285citing papers in PubMed, 1 pooled it
–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

285 citing papers in PubMed, 1 synthesis or guideline pooled it.

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  13. Wheat's Up with CRISPR-Cas-Current Advances, Obstacles and Perspectives.International journal of molecular sciences · 2026
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225 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

12 authors.

Antonio CasiniCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.ORCID 0000-0001-7709-4955
Michele OlivieriCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.ORCID 0000-0002-0257-998X
Gianluca PetrisCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.ORCID 0000-0002-2420-6359
Claudia MontagnaCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.
Giordano ReginatoCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.
Giulia MauleCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.
Francesca LorenzinCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Computational Oncology, Trento, Italy.
Davide PrandiCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Computational Oncology, Trento, Italy.
Alessandro RomanelCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Computational Oncology, Trento, Italy.ORCID 0000-0003-4855-8620
Francesca DemichelisCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Computational Oncology, Trento, Italy.
Alberto IngaCentre for Integrative Biology (CIBIO), Laboratory of Transcriptional Networks, Trento, Italy.
Anna CeresetoCentre for Integrative Biology (CIBIO), University of Trento, Laboratory of Molecular Virology, Trento, Italy.

Funding

European Research Council 648670
6 · The paper itself

Abstract

Despite the utility of CRISPR-Cas9 nucleases for genome editing, the potential for off-target activity limits their application, especially for therapeutic purposes. We developed a yeast-based assay to identify optimized Streptococcus pyogenes Cas9 (SpCas9) variants that enables simultaneous evaluation of on- and off-target activity. We screened a library of SpCas9 variants carrying random mutations in the REC3 domain and identified mutations that increased editing accuracy while maintaining editing efficiency. We combined four beneficial mutations to generate evoCas9, a variant that has fidelity exceeding both wild-type (79-fold improvement) and rationally designed Cas9 variants (fourfold average improvement), while maintaining near wild-type on-target editing efficiency (90% median residual activity). Evaluating evoCas9 on endogenous genomic loci, we demonstrated a substantially improved specificity and observed no off-target sites for four of the eight single guide RNAs (sgRNAs) tested. Finally, we showed that following long-term expression (40 d), evoCas9 strongly limited the nonspecific cleavage of a difficult-to-discriminate off-target site and fully abrogated the cleavage of two additional off-target sites.

Indexed as

Gene EditingCRISPR-Associated Protein 9CRISPR-Cas SystemsMutationRNA, Guide, CRISPR-Cas SystemsStreptococcus pyogenesSubstrate SpecificityCRISPR-Associated Protein 9RNA, Guide, CRISPR-Cas Systems

Identifiers

PMID29431739
PMCPMC6066108

What OpenQuestion holds

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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.