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Related Experiment Videos

Trans-acting factors in chromosomal instability.

E W Campbell1, D Chen, J Tesmer

  • 1Los Alamos National Laboratory, New Mexico 87545.

Cancer Genetics and Cytogenetics
|August 1, 1990
PubMed
Summary

Trans-acting factors influence chromosome stability. Unstable Chinese hamster cells (CHX) produced more human-hamster translocations and fragments than stable CHO cells, suggesting a diffusible clastogenic factor.

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Area of Science:

  • Cell Biology
  • Genetics
  • Cytogenetics

Background:

  • Chromosome instability can arise from trans-acting factors.
  • Human X Chinese hamster somatic cell hybrids are valuable models for studying chromosome stability.

Purpose of the Study:

  • To investigate the hypothesis that trans-acting factors affect chromosome stability.
  • To compare chromosome instability in hybrid cells with stable (CHO) versus unstable (CHX) hamster karyotypes.

Main Methods:

  • Human X Chinese hamster somatic cell hybrids were generated and cultured.
  • Metaphase chromosome spreads were analyzed using in situ hybridization with biotin-labeled human genomic DNA.
  • Chromosome numbers and interspecies translocations were quantified at various population doublings.

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Main Results:

  • Hybrid cells with an unstable CHX hamster background showed increased generation of human-hamster translocated chromosomes.
  • Human acentric fragments were more frequent in CHX-background hybrids compared to CHO-background hybrids.
  • These findings suggest ongoing production of a diffusible clastogenic factor in the CHX line.

Conclusions:

  • Trans-acting factors significantly impact chromosome stability in hybrid cells.
  • The unstable CHX karyotype likely produces a diffusible clastogenic factor contributing to chromosome instability.
  • Somatic cell hybridization provides insights into the mechanisms underlying karyotype instability.