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Updated: Aug 12, 2026

Selection-dependent and Independent Generation of CRISPR/Cas9-mediated Gene Knockouts in Mammalian Cells
Published on: June 16, 2017
Targeted gene correction by small single-stranded oligonucleotides in mammalian cells
O Igoucheva1, V Alexeev, K Yoon
1Department of Dermatology and Cutaneous Biology, Department of Biochemistry and Molecular Pharmacology, Jefferson Institute of Molecular Medicine, Thomas Jefferson University and Jefferson Medical College, Philadelphia, PA 19107, USA.
Short single-stranded oligodeoxynucleotides (ODN) can correct single point mutations in mammalian cells. These ODNs demonstrate gene correction frequencies comparable to chimeric RNA-DNA oligonucleotides.
Area of Science:
- Molecular Biology
- Genetics
- Biotechnology
Background:
- Gene correction technologies are crucial for treating genetic disorders.
- Oligonucleotides are being explored as tools for precise DNA repair.
Purpose of the Study:
- To investigate the efficacy of short single-stranded oligodeoxynucleotides (ODN) for gene correction in mammalian cells.
- To compare the gene correction efficiency of ODNs with chimeric RNA-DNA oligonucleotides.
Main Methods:
- Utilized short single-stranded oligodeoxynucleotides (25-61 bases) with a single mismatch to target a point mutation (G to A) in the beta-galactosidase gene.
- Assessed gene correction in nuclear extracts, episomal DNA, and chromosomal DNA of mammalian cells.
- Varied ODN length, polarity (sense vs. antisense), and composition (deoxyribo- vs. ribo-oligonucleotides).
Main Results:
- Short single-stranded ODNs achieved gene correction at frequencies of approximately 0.05% (nuclear extracts), 1% (episome), and 0.1% (chromosome).
- ODN gene correction efficiency was comparable to chimeric RNA-DNA oligonucleotides.
- Episomal and chromosomal correction were dependent on ODN length and antisense orientation significantly enhanced correction (1000-fold).
- Deoxyoligonucleotides were more effective than ribo-oligonucleotides.
Conclusions:
- Short single-stranded ODNs are effective tools for sequence-specific gene correction in mammalian cells.
- ODN length and orientation influence gene correction efficiency, suggesting transcriptional involvement.
- ODNs offer a viable alternative to chimeric oligonucleotides for gene correction applications.
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