Cited by 237CRISPR and Genetic EngineeringPlant Genetic and Mutation StudiesTransgenic Plants and Applications

Site-directed mutagenesis in Petunia × hybrida protoplast system using direct delivery of purified recombinant Cas9 ribonucleoproteins

Subburaj, Saminathan, Chung, Sung Jin, Lee, Choongil, Ryu, Seuk-Min, Kim, Duk Hyoung, Kim, Jin-Soo, Bae, Sangsu, Lee, Geung-Joo·2016·Plant Cell Reports

Abstract

Key message Site-directed mutagenesis of nitrate reductase genes using direct delivery of purified Cas9 protein preassembled with guide RNA produces mutations efficiently in Petunia × hybrida protoplast system. The clustered, regularly interspaced, short palindromic repeat (CRISPR)-CRISPR associated endonuclease 9 (CRISPR/Cas9) system has been recently announced as a powerful molecular breeding tool for site-directed mutagenesis in higher plants. Here, we report a site-directed mutagenesis method targeting Petunia nitrate reductase (NR) gene locus. This method could create mutations efficiently using direct delivery of purified Cas9 protein and single guide RNA (sgRNA) into protoplast cells. After transient introduction of RNA-guided endonuclease (RGEN) ribonucleoproteins (RNPs) with different sgRNAs targeting NR genes, mutagenesis at the targeted loci was detected by T7E1 assay and confirmed by targeted deep sequencing. T7E1 assay showed that RGEN RNPs induced site-specific mutations at frequencies ranging from 2.4 to 21 % at four different sites (NR1, 2, 4 and 6) in the PhNR gene locus with average mutation efficiency of 14.9 ± 2.2 %. Targeted deep DNA sequencing revealed mutation rates of 5.3-17.8 % with average mutation rate of 11.5 ± 2 % at the same NR gene target sites in DNA fragments of analyzed protoplast transfectants. Further analysis from targeted deep sequencing showed that the average ratio of deletion to insertion produced collectively by the four NR-RGEN target sites (NR1, 2, 4, and 6) was about 63:37. Our results demonstrated that direct delivery of RGEN RNPs into protoplast cells of Petunia can be exploited as an efficient tool for site-directed mutagenesis of genes or genome editing in plant systems.

Integrity signals

Registry

Crossref · 10.1007/s00299-016-1937-7

Cites

55 of 55 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

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?

  • Effective delivery of Cas9/sgRNA ribonucleoprotein complexes (RNPs) can be difficult due to the large size of Cas9 protein (~160 kD), the positive charge of Cas9 protein and the strong negative charge of sgRNA.

    “However, due to the large size of Cas9 protein (~ 160 kD), the positive charge of Cas9 protein and the strong negative charge of sgRNA, the effective delivery of Cas9/sgRNA ribonucleoprotein complexes (RNPs) can be difficult [88–91].”
  • Cas9 protein from S. pyogenes has molecular weight about 160 KD, larger than most proteins.

    “The molecular weight of the commonly used Cas9 protein from streptococcus pyogenes is about 160 KD, larger than that of the most proteins [89].”
  • First obstacle: effective encapsulation of editing tools in delivery vectors is hindered by large size and different charge properties of Cas9 protein, mRNA and donor DNA.

    “The first obstacle is effective encapsulation of the editing tools in delivery vectors due to the large size and different charge properties of Cas9 protein, mRNA and donor DNA.”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Subburaj, S., Chung, S. J., Lee, C., Ryu, S.-M., Kim, D. H., Kim, J.-S., Bae, S., & Lee, G.-J.
Affiliations
  • Chungnam National University (KR)
  • Seoul National University (KR)
  • Hanyang University (KR)
Corresponding author
  • Bae, Sangsu
  • Lee, Geung-Joo
Venue
Plant Cell Reports
Published
2016-01-29
Volume
35
Issue
7
Pages
1535-1544
ISSN
  • 0721-7714 (ISSN-L)
  • 1432-203X
OpenAlex
W2469880247
Cited by
237
References
55
Citations by year
2026: 11 · 2025: 12 · 2024: 23 · 2023: 28 · 2022: 35 · 2021: 35 · 2020: 29 · 2019: 25 · 2018: 13 · 2017: 14 · 2016: 12
FWCI
11.09
Type
journal article
Language
en
Open access
closed
Locations
  • Plant Cell Reports (publishedVersion)
  • PubMed (publishedVersion)
  • Seoul National University Open Repository (Seoul National University) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Genetic and Mutation Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Transgenic Plants and Applications
Keywords
CRISPR/Cas9, site-directed mutagenesis, Petunia hybrida, protoplast transformation, nitrate reductase, single guide RNA, ribonucleoprotein delivery, mutation efficiency, plant genome editing
MeSH terms
Base Sequence, Genetic Engineering, Microscopy, Fluorescence, Models, Genetic, Plant Proteins, Protoplasts, Recombinant Proteins, Ribonucleoproteins, Sequence Homology, Nucleic Acid, Mutagenesis, Site-Directed, Genome, Plant, Petunia, High-Throughput Nucleotide Sequencing, CRISPR-Cas Systems

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