The use of C0t-1 probe DNA for the detection of low levels of DNA fragmentation.

P. Wong, S. B. Smith, N. Bora, S. Gentleman

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


In many apoptotic systems the final demise of the DNA results in the generation of multinucleosomal-sized DNA fragments, which appear as a DNA ladder after agarose electrophoresis. Extensive DNA fragmentation can be detected by ethidium bromide staining. Visualization of low levels of DNA fragmentation, however, requires both a more sensitive detection system, as well as a method of DNA extraction, that limits the extent of high molecular weight DNA shearing. We have found that the use of C0t-1 repetitive DNA as a probe for Southern analysis of DNA ladders is a sensitive method to detect low levels of DNA fragmentation. We have applied this methodology in the detection of DNA fragmentation in the normal developing C57BL/6 mouse retina at stages in which there is known DNA fragmentation, as well as in human Y-79 retinoblastoma cells grown in culture. We have found that in many instances in which there is no detectable DNA ladder with ethidium bromide staining a very definitive DNA ladder can be visualized via Southern blot analysis with a C0t-1 DNA probe.

Original languageEnglish (US)
Pages (from-to)649-653
Number of pages5
JournalBiochemistry and cell biology = Biochimie et biologie cellulaire
Issue number11-12
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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