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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Targeted genome modification via triple helix formation.

Adele S Ricciardi1, Nicole A McNeer, Kavitha K Anandalingam

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Triplex-forming oligonucleotides (TFOs) enable precise genome editing by targeting specific DNA sites. This method, utilizing peptide nucleic acids, facilitates mutagenesis and homologous recombination for advanced genetic modification strategies.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Genome modification requires precise targeting for therapeutic and research applications.
  • Triplex-forming oligonucleotides (TFOs) offer a mechanism for site-specific DNA interaction.

Purpose of the Study:

  • To describe the application of TFOs, including peptide nucleic acids (PNAs), for targeted genome modification.
  • To provide protocols for TFO design, delivery, and activity evaluation.

Main Methods:

  • Design of TFOs, specifically peptide nucleic acids, for targeting specific genomic loci.
  • In vitro and in vivo delivery methods for TFOs.
  • Evaluation of TFO-induced mutagenesis and homologous recombination.

Main Results:

  • Demonstrated the capability of TFOs to coordinate site-specific genome modification.
  • Showcased TFOs' potential in inducing mutagenesis and homologous recombination events.
  • Provided practical protocols for TFO implementation.

Conclusions:

  • TFOs, particularly PNAs, represent a powerful tool for targeted genome engineering.
  • The described methods facilitate the application of TFOs in diverse biological contexts.
  • This approach holds promise for advancing genetic research and therapeutic strategies.