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Related Experiment Videos

Chromosomal destabilization during gene amplification.

J C Ruiz1, G M Wahl

  • 1Gene Expression Laboratory, Salk Institute, La Jolla, California 92037.

Molecular and Cellular Biology
|June 1, 1990
PubMed
Summary
This summary is machine-generated.

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Gene amplification begins with chromosomal deletion, forming extrachromosomal elements. These elements then integrate into chromosomes, leading to instability and further amplification in cancer and drug-resistant cells.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Acentric extrachromosomal elements (episomes, double minutes) are key intermediates in gene amplification.
  • Gene amplification is common in drug-resistant and tumor cell lines.

Purpose of the Study:

  • Investigate molecular mechanisms of extrachromosomal element generation.
  • Trace the fate of amplification intermediates over time.

Main Methods:

  • Utilized a Chinese hamster cell line (L46) with a previously characterized unstable extrachromosomal element.
  • Employed fluorescence in situ hybridization (FISH) at multiple time points.

Main Results:

  • Extrachromosomal molecules are formed via chromosomal deletion.

Related Experiment Videos

  • These molecules rapidly integrate into chromosomes, often near telomeres.
  • Integrated amplified sequences exhibit instability, causing further chromosome instability.

    • Conclusions:

    • Established a molecular and cytogenetic chronology of gene amplification.
    • Early deletion generates extrachromosomal elements, followed by integration and chromosome instability.