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Related Experiment Videos

Oligonucleotide-directed single-base DNA alterations in mouse embryonic stem cells.

E A Pierce1, Q Liu, O Igoucheva

  • 1FM Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.

Gene Therapy
|January 15, 2003
PubMed
Summary

Single-stranded oligodeoxy-nucleotides (ssODN) can correct single-base mutations in mouse embryonic stem cells. This DNA repair method holds promise for creating precise animal models of genetic diseases.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Gene editing technologies are crucial for understanding genetic diseases.
  • Developing precise methods for altering genomic DNA in embryonic stem cells is essential for creating accurate disease models.

Purpose of the Study:

  • To investigate the efficacy of single-stranded oligodeoxy-nucleotides (ssODN) for precise single-base DNA correction in mouse embryonic stem (ES) cells.
  • To evaluate the potential of ssODN-mediated gene correction for generating genetically modified ES cells.

Main Methods:

  • Utilized reporter genes (EGFP and LacZ) with inactivating point mutations in mouse ES cells.
  • Employed homologous ssODN with a single mismatch at the mutant site to correct reporter gene activity.
  • Assessed correction efficiency in both episomal and chromosomal DNA, comparing sense and antisense ssODN orientations.

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Main Results:

  • Demonstrated successful correction of single-base mutations in both episomal and chromosomal reporter genes in mouse ES cells using ssODN.
  • Observed gene correction rates of 0.5-1.0% in CHO-K1 cells and approximately 10(-4) in mouse ES cells.
  • Found that antisense ssODN orientation yielded higher gene conversion rates compared to sense orientation.

Conclusions:

  • Single-stranded oligodeoxy-nucleotides can effectively introduce specific single-base alterations into the genomic DNA of mouse ES cells.
  • While current efficiency is low, ssODN-mediated gene correction offers a potential one-step method for generating precisely mutated ES cells.
  • This technique could facilitate the creation of accurate mouse models for studying inherited diseases.