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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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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Genome Editing with CompoZr Custom Zinc Finger Nucleases ZFNs
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Highly efficient endogenous human gene correction using designed zinc-finger nucleases.

Fyodor D Urnov1, Jeffrey C Miller, Ya-Li Lee

  • 1Sangamo BioSciences, Inc., Pt. Richmond Tech Center 501, Canal Blvd, Suite A100 Richmond, California 94804, USA.

Nature
|April 5, 2005
PubMed
Summary
This summary is machine-generated.

This study introduces zinc-finger nucleases to precisely edit the human genome, overcoming previous limitations in gene therapy. This breakthrough enables efficient gene correction, paving the way for treating genetic diseases.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biotechnology

Background:

  • Permanent genome modification in humans is challenging due to low homologous recombination rates.
  • This limitation hinders biomedical research and the development of effective gene therapies.

Purpose of the Study:

  • To develop a general solution for precise in vivo genome modification.
  • To enhance homologous recombination frequency for gene therapy applications.

Main Methods:

  • Utilized C2H2 zinc-finger proteins for DNA recognition and engineered them with nuclease domains.
  • Induced targeted DNA double-strand breaks to stimulate homology-directed repair.
  • Designed zinc-finger nucleases targeting an X-linked severe combined immune deficiency (SCID) mutation in the IL2Rgamma gene.

Main Results:

  • Achieved over 18% gene-modified human cells without selection.
  • Demonstrated successful modification on both X chromosomes in approximately 7% of cells.
  • Observed accurate genotype reflection at messenger RNA and protein levels.
  • Reported high modification frequencies in human T cells.

Conclusions:

  • Zinc-finger nucleases offer a viable strategy for precise human genome editing.
  • This technology shows promise for developing novel gene therapies for genetic disorders.
  • The approach significantly advances the potential for in vivo gene correction and disease treatment.