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Structures of replacement vectors for efficient gene targeting

K Horie1, S Nishiguchi, S Maeda

  • 1Department of Medical Genetics, Osaka University.

Journal of Biochemistry
|March 1, 1994
PubMed
Summary
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Optimizing DNA vector structure enhances gene targeting efficiency. Placing pBR322 DNA at the 3' end of the HSV-tk gene improved selection enrichment and targeting frequency in mouse cells.

Area of Science:

  • Molecular Biology
  • Genetics

Background:

  • Gene targeting is crucial for genetic research and therapeutic development.
  • Positive-negative selection strategies are employed to increase the efficiency of identifying targeted cells.

Purpose of the Study:

  • To investigate the impact of DNA vector structure on gene targeting efficiency using positive-negative selection.
  • To optimize vector design for improved selection enrichment and isolation of targeted clones.

Main Methods:

  • Constructed replacement vectors containing pBR322 DNA, neomycin-resistance (neo) gene, herpes simplex virus thymidine kinase (HSV-tk) gene, and a mouse transthyretin (ttr) genomic fragment.
  • Linearized vectors were transfected into mouse embryonal carcinoma F9 cells.
  • Utilized G418 for positive selection and gancyclovir (GANC) for negative selection.

Related Experiment Videos

  • Analyzed targeted clones using Southern blot analysis.

    • Main Results:

    • Placing pBR322 DNA at the 3' end of the HSV-tk gene increased both GANC selection enrichment and gene targeting frequency.
    • Reducing the size of the ttr fragment between selection markers enhanced enrichment but decreased targeting frequency.
    • Exonucleolytic degradation of HSV-tk genes from vector ends was identified as a major cause of GANC selection inefficiency.

    Conclusions:

    • Vector DNA structure significantly influences gene targeting efficiency.
    • Strategic placement of pBR322 DNA and optimization of fragment size can improve selection enrichment.
    • Understanding vector degradation mechanisms is key to enhancing gene targeting strategies.