Cited by 1,088CRISPR and Genetic EngineeringRNA regulation and diseaseRNA Interference and Gene Delivery

The DOI matches its Crossref record; 36 of the 37 references it cites were found in a registry or an index.

CCTop: An Intuitive, Flexible and Reliable CRISPR/Cas9 Target Prediction Tool

Open access
Stemmer, Manuel, Thumberger, Thomas, del Sol Keyer, Maria, Wittbrodt, Joachim, Mateo, Juan L.·2015·PLoS ONE

Abstract

Engineering of the CRISPR/Cas9 system has opened a plethora of new opportunities for site-directed mutagenesis and targeted genome modification. Fundamental to this is a stretch of twenty nucleotides at the 5' end of a guide RNA that provides specificity to the bound Cas9 endonuclease. Since a sequence of twenty nucleotides can occur multiple times in a given genome and some mismatches seem to be accepted by the CRISPR/Cas9 complex, an efficient and reliable in silico selection and evaluation of the targeting site is key prerequisite for the experimental success. Here we present the CRISPR/Cas9 target online predictor (CCTop, http://crispr.cos.uni-heidelberg.de) to overcome limitations of already available tools. CCTop provides an intuitive user interface with reasonable default parameters that can easily be tuned by the user. From a given query sequence, CCTop identifies and ranks all candidate sgRNA target sites according to their off-target quality and displays full documentation. CCTop was experimentally validated for gene inactivation, non-homologous end-joining as well as homology directed repair. Thus, CCTop provides the bench biologist with a tool for the rapid and efficient identification of high quality target sites.

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Crossref · 10.1371/journal.pone.0124633

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Figures

Fig 1 CCTop web interface. (A) Main page containing the input fields to customize the identification of sgRNA target sites and the off-target prediction. (B) Results page providing detailed information of all identified sgRNA target sites.
Fig 1 CCTop web interface. (A) Main page containing the input fields to customize the identification of sgRNA target sites and the off-target prediction. (B) Results page providing detailed information of all identified sgRNA target sites.CC BY · PubMed Central
Fig 2 Experimental verification of sgRNA-1. (A) In vitro cleavage depending on sgRNA-1/Cas9 occurred on linearized plasmids containing eGFP but not eGFP var. Successful cleavage of eGFP plasmid (4128bp) resulted in a 2052bp and 2076bp fragment. The absence of expected fragments (627bp, 4025bp) demonstrated that eGFP var (4652bp) was not digested by sgRNA-1/Cas9. (B) A faint double band (2154bp, 2198bp, asterisk) indicated inefficient digestion of off-target 1 (OT#1) while OT#2 and OT#3 (S1 Table) were not cleaved. Note: contrast was enhanced for better visualization. (C) Silent mutations of sgRNA-1 target site in eGFP var. (D-E) Injections of sgRNA-1 and Cas9 mRNA into wimb -/+ embryos (D) resulted in strong inactivation of eGFP (E).
Fig 2 Experimental verification of sgRNA-1. (A) In vitro cleavage depending on sgRNA-1/Cas9 occurred on linearized plasmids containing eGFP but not eGFP var. Successful cleavage of eGFP plasmid (4128bp) resulted in a 2052bp and 2076bp fragment. The absence of expected fragments (627bp, 4025bp) demonstrated that eGFP var (4652bp) was not digested by sgRNA-1/Cas9. (B) A faint double band (2154bp, 2198bp, asterisk) indicated inefficient digestion of off-target 1 (OT#1) while OT#2 and OT#3 (S1 Table) were not cleaved. Note: contrast was enhanced for better visualization. (C) Silent mutations of sgRNA-1 target site in eGFP var. (D-E) Injections of sgRNA-1 and Cas9 mRNA into wimb -/+ embryos (D) resulted in strong inactivation of eGFP (E).CC BY · PubMed Central
Fig 3 Visual evaluation of targeting specificity of selected sgRNAs. Exclusive and homogenous expression of eGFP in the domains of cryaa (A, A’), rx2 (B) and actb (D) was evident already in the injected generation (F0). The integrations were transmitted to the next generation (F1; C, E).
Fig 3 Visual evaluation of targeting specificity of selected sgRNAs. Exclusive and homogenous expression of eGFP in the domains of cryaa (A, A’), rx2 (B) and actb (D) was evident already in the injected generation (F0). The integrations were transmitted to the next generation (F1; C, E).CC BY · PubMed Central

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Metadata

Authors
Stemmer, M., Thumberger, T., del Sol Keyer, M., Wittbrodt, J., & Mateo, J. L.
Affiliations
Heidelberg University (DE)
Corresponding author
  • Thumberger, Thomas
  • Wittbrodt, Joachim
  • Mateo, Juan L.
Venue
PLoS ONE
Published
2015-04-24
Volume
10
Issue
4
Pages
e0124633
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1990149668
Cited by
1,088
References
37
Citations by year
2026: 87 · 2025: 99 · 2024: 106 · 2023: 140 · 2022: 129 · 2021: 114 · 2020: 139 · 2019: 96 · 2018: 72 · 2017: 53 · 2016: 39 · 2015: 13
FWCI
25.61
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • Deutsche Forschungsgemeinschaft (SFB873)
  • Universität Heidelberg
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
CRISPR/Cas9, sgRNA design, off-target prediction, genome editing, gene inactivation, non-homologous end joining, homology-directed repair, web-based prediction tool
MeSH terms
Animals, Binding Sites, Humans, RNA, Messenger, Software, User-Computer Interface, Reproducibility of Results, Gene Targeting, Computational Biology, Internet, Genomics, CRISPR-Cas Systems, Web Browser

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