Linked Life Data

19465922

Source:http://linkedlifedata.com/resource/pubmed/id/19465922

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pubmed-article:19465922pubmed:abstractTextSeveral inherited syndromes in humans are associated with cancer predisposition. The gene products defective in two of these disorders, BLM (a helicase defective in Bloom's syndrome) and FANC A-N (defective in Fanconi anaemia), associate in a multienzyme complex called BRAFT. How these proteins suppress tumorigenesis remains unclear, although both conditions are associated with chromosome instability. Here we show that the Fanconi anaemia proteins FANCD2 and FANCI specifically associate with common fragile site loci irrespective of whether the chromosome is broken. Unexpectedly, these loci are frequently interlinked through BLM-associated ultra-fine DNA bridges (UFBs) even as cells traverse mitosis. Similarly to fragile site expression, fragile site bridging is induced after partial inhibition of DNA replication. We propose that, after replication stress, sister chromatids are interlinked by replication intermediates primarily at genetic loci with intrinsic replication difficulties, such as fragile sites. In Bloom's syndrome cells, inefficient resolution of DNA linkages at fragile sites gives rise to increased numbers of anaphase UFBs and micronuclei containing fragile site DNA. Our data have general implications concerning the contribution of fragile site loci to chromosomal instability and tumorigenesis.lld:pubmed
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pubmed-article:19465922pubmed:year2009lld:pubmed
pubmed-article:19465922pubmed:articleTitleReplication stress induces sister-chromatid bridging at fragile site loci in mitosis.lld:pubmed
pubmed-article:19465922pubmed:affiliationWeatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DS, UK.lld:pubmed
pubmed-article:19465922pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19465922pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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