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Triplex-stimulated intermolecular recombination at a single-copy genomic target
Melissa P Knauert1, Jennifer M Kalish, Denise C Hegan
1Department of Therapeutic Radiology and Department of Genetics, Yale University School of Medicine, New Haven, CT 06520-8040, USA.
Summary
Triple helix-forming oligonucleotides (TFOs) can stimulate gene correction at specific DNA sites. This study demonstrates TFOs efficiently correct single-copy genes in mammalian cells, advancing therapeutic gene targeting strategies.
Area of Science:
- Molecular Biology
- Genetics
- Biotechnology
Background:
- Gene targeting offers therapeutic potential for correcting mutations in human genes.
- Improving the efficiency of site-specific recombination is crucial for gene therapy.
- Oligonucleotide-mediated triple helix formation can induce DNA repair and stimulate recombination.
Purpose of the Study:
- To establish the ability of triple helix-forming oligonucleotides (TFOs) to induce gene correction at a single-copy chromosomal locus.
- To evaluate the efficiency and specificity of TFO-induced gene correction using exogenous donor DNAs.
Main Methods:
- Utilized mammalian cell lines with a firefly luciferase reporter gene integrated into a single-copy chromosomal locus.
- Cotransfected cells with TFOs and short, single-stranded DNA donor molecules.
- Assessed gene correction frequencies and specificity through dose-dependent analysis.
Main Results:
- Demonstrated TFOs can induce gene correction by exogenous donor DNAs at a single-copy chromosomal locus.
- Achieved gene correction frequencies up to 0.1%, a five- to ninefold increase above background.
- Confirmed oligonucleotide-specific and target site-specific effects, and effectiveness of both parallel and antiparallel triple helix formation.
Conclusions:
- TFOs are effective reagents for stimulating site-specific gene correction at chromosomal loci.
- These findings support the development of TFOs for therapeutic correction of defective human genes.