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Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

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Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Related Experiment Video

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Capturing Common Fragile Site Breaks by Native γH2A.X ChIP
09:46

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Published on: January 24, 2025

Chromosome fragility: molecular mechanisms and cellular consequences.

Catherine H Freudenreich1

  • 1Department of Biology and Program in Genetics, Tufts University, Medford, MA 02155, USA. catherine.freudenreich@tufts.edu

Frontiers in Bioscience : a Journal and Virtual Library
|June 16, 2007
PubMed
Summary

Fragile sites are genome regions prone to breakage. Research links replication stress and DNA structures to fragile sites, offering insights into cancer development.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Fragile sites are genomic regions susceptible to chromosomal breakage.
  • Rare fragile sites in humans involve repetitive DNA sequences forming secondary structures.
  • Common fragile sites are large genomic regions, induced by replication stress, with unclear sequence elements.

Purpose of the Study:

  • To review recent progress in understanding the link between replication and chromosome fragility.
  • To explore proteins and conditions that prevent chromosome fragility.
  • To investigate mechanisms of fragility and chromosomal rearrangements using yeast models.

Main Methods:

  • Review of existing literature on fragile sites.
  • Analysis of DNA secondary structures (hairpins, cruciforms, quadruplexes).
  • Characterization of deletions, duplications, and translocations in yeast fragile sites.

Main Results:

  • Replication stress is a key factor in common fragile site breakage.
  • Proteins and specific conditions can mitigate chromosome fragility.
  • Yeast fragile sites provide models for understanding chromosomal instability and rearrangements.
  • Fragile site instability is an early event in tumorigenesis.

Conclusions:

  • Understanding fragile sites, particularly common fragile sites, is crucial for insights into cancer initiation.
  • Replication stress and DNA secondary structures are critical determinants of fragile site instability.
  • Yeast models offer valuable insights into the mechanisms underlying fragile site-associated genomic instability.