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Related Experiment Videos

Mechanisms for recombination between stably integrated vector sequences in CHO cells.

D Hellgren1, B Lambert

  • 1Karolinska Institute, Department of Clinical Genetics, Karolinska Hospital, Stockholm, Sweden.

Mutation Research
|December 1, 1989
PubMed
Summary

Homologous recombination in CHO cells was studied using a neo gene vector. Deletions or unequal sister chromatid exchange were the main mechanisms reactivating the neo gene, not gene conversion.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Homologous recombination is a key DNA repair mechanism.
  • Understanding recombination mechanisms in mammalian cells is crucial for genetic engineering and gene therapy.
  • The pIII-14gpt vector system allows for the study of recombination events by restoring functional neo gene activity.

Purpose of the Study:

  • To investigate the possible mechanisms of homologous recombination in Chinese Hamster Ovary (CHO) cells.
  • To analyze the types of DNA rearrangements occurring during neo gene reactivation.
  • To determine the predominant recombination pathways in this experimental system.

Main Methods:

  • Utilized a stably integrated pIII-14gpt vector in CHO cells.
  • Induced neo gene reactivation by creating a functional gene from two inactive fragments.

Related Experiment Videos

  • Analyzed DNA from 74 G418-resistant cell clones using Southern blotting and neo-specific probes.

    • Main Results:

    • All analyzed G418-resistant clones exhibited rearrangements in the neo gene fragments.
    • Approximately 50% of revertants showed deletions that restored neo gene function.
    • A single revertant (1.3%) indicated a gene conversion event, while ~48% displayed complex rearrangements.

    Conclusions:

    • The predominant mechanisms for neo gene reactivation in CHO cells via homologous recombination are intrachromatidal deletions or unequal sister chromatid exchange.
    • Gene conversion appears to be a rare event in this system.
    • The findings provide insights into the DNA repair and recombination pathways in mammalian cells.