Source:http://linkedlifedata.com/resource/pubmed/id/16465272
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
6
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| pubmed:dateCreated |
2006-2-8
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| pubmed:abstractText |
Apoptosis is characterised by the degradation of DNA into a specific pattern of high and low molecular weight fragments seen on agarose gels as a distribution of sizes between 50-300 kb and sometimes, but not always, a ladder of smaller oligonucleosomal fragments. Using a 2D pulsed field-conventional agarose gel electrophoresis technique, where the second dimension is run under either normal or denaturing conditions, we show that single-strand breaks are introduced into DNA at the initial stages of fragmentation. Using single-strand specific nuclease probes we further show that the complete fragmentation pattern, including release of small oligonucleosomal fragments can also be generated by a single-strand endonuclease. Three classes of sites where single-strand breaks accumulate were identified. The initial breaks produce a distribution of fragment sizes (50 kb to >1 Mb) similar to those generated by Topoisomerase II inhibitors suggesting that cleavage may commence at sites of attachment of DNA to the nuclear matrix. A second class of rare sites is also cut further reducing the size distribution of the fragments to 50-300 kb. Thirdly, single-strand breaks accumulate at the linker region between nucleosomes eventually causing double-strand scissions which release oligonucleosomes. These observations further define the properties of the endonuclease responsible for DNA fragmentation in apoptosis.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Aug
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| pubmed:issn |
1350-9047
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:volume |
4
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
506-15
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| pubmed:year |
1997
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| pubmed:articleTitle |
Evidence that DNA fragmentation in apoptosis is initiated and propagated by single-strand breaks.
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| pubmed:affiliation |
Apoptosis Research Group, Institute for Biological Sciences, National Research Council of Canada, Ottawa, Ontario, K1A OR6, Canada. roy.walker@nrc.ca
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| pubmed:publicationType |
Journal Article
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