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New common fragile sites.

F Hecht1, E H Tajara, D Lockwood

  • 1Cancer Center, Southwest Biomedical Research Institute, Scottsdale, AZ 85251.

Cancer Genetics and Cytogenetics
|July 1, 1988
PubMed
Summary
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Researchers identified numerous new common fragile sites in human DNA, with over half of those found being previously undescribed. This discovery suggests shared structural characteristics among these fragile DNA regions.

Area of Science:

  • Genetics and Genomics
  • Human Molecular Cytogenetics

Background:

  • Common fragile sites (CFS) are specific regions on human chromosomes prone to breakage.
  • Previous characterization of CFS was established at the Eighth International Workshop on Human Gene Mapping (HGM 8).

Purpose of the Study:

  • To identify and characterize novel common fragile sites in human lymphocytes.
  • To investigate the induction patterns of fragile sites using various chemical agents.

Main Methods:

  • Culturing 3023 lymphocytes from nine unrelated individuals with a history of genitourinary malignancy.
  • Inducing fragile sites using aphidicolin (Apc), fluorodeoxyuridine (FUdR), 5-azacytidine (Aza), and bromodeoxyuridine (BrdU).
  • Analyzing lymphocyte samples for gaps and breaks, particularly at high-expression fragile sites.

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Main Results:

  • Thirty-one (56%) of 55 identified CFS were novel, not described at HGM 8.
  • Specific agents induced distinct sets of CFS, with cross-induction observed between Apc/FUdR and BrdU.
  • Fragile sites induced by diminished 5-azacytidine were often in heterochromatic regions and showed cross-induction.

Conclusions:

  • A significant number of new common fragile sites exist, indicating incomplete knowledge of these genomic regions.
  • Cross-induction patterns suggest that common fragile sites may share underlying DNA structural similarities.
  • The study highlights the need for further research into the nature and function of common fragile sites.