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  • 1
    Language: English
    In: Nucleic acids research, 2014-05-01, Vol.42 (9), p.5644-5656
    Description: DNA double-strand breaks (DSBs) can cause chromosomal rearrangements and extensive loss of heterozygosity (LOH), hallmarks of cancer cells. Yet, how such events are normally suppressed is unclear. Here we identify roles for the DNA damage checkpoint pathway in facilitating homologous recombination (HR) repair and suppressing extensive LOH and chromosomal rearrangements in response to a DSB. Accordingly, deletion of Rad3ATR, Rad26ATRIP, Crb253BP1 or Cdc25 overexpression leads to reduced HR and increased break-induced chromosome loss and rearrangements. We find the DNA damage checkpoint pathway facilitates HR, in part, by promoting break-induced Cdt2-dependent nucleotide synthesis. We also identify additional roles for Rad17, the 9-1-1 complex and Chk1 activation in facilitating break-induced extensive resection and chromosome loss, thereby suppressing extensive LOH. Loss of Rad17 or the 9-1-1 complex results in a striking increase in break-induced isochromosome formation and very low levels of chromosome loss, suggesting the 9-1-1 complex acts as a nuclease processivity factor to facilitate extensive resection. Further, our data suggest redundant roles for Rad3ATR and Exo1 in facilitating extensive resection. We propose that the DNA damage checkpoint pathway coordinates resection and nucleotide synthesis, thereby promoting efficient HR repair and genome stability.
    Subject(s): Cell Cycle Checkpoints ; Checkpoint Kinase 2 - metabolism ; Chromosomes, Fungal - genetics ; Comparative Genomic Hybridization ; DNA Breaks, Double-Stranded ; DNA Cleavage ; Exodeoxyribonucleases - metabolism ; Genome Integrity, Repair and ; Genome, Fungal ; Genomic Instability ; Loss of Heterozygosity ; Nucleotides - biosynthesis ; Recombinational DNA Repair ; Schizosaccharomyces - genetics ; Schizosaccharomyces - metabolism ; Schizosaccharomyces pombe ; Schizosaccharomyces pombe Proteins - metabolism
    ISSN: 0305-1048
    E-ISSN: 1362-4962
    Source: PubMed Central
    Source: DOAJ Directory of Open Access Journals - Not for CDI Discovery
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  • 2
    Language: English
    In: Seminars in cell & developmental biology, 2011, Vol.22 (8), p.886-897
    Description: ► We consider the relationship between chromosomal rearrangements and cancer. ► We review the mechanisms by which non-homologous end joining (NHEJ) and homologous recombination (HR) repair pathways can promote chromosomal rearrangements. ► We further consider how failed NHEJ and HR pathways can lead to chromosomal rearrangements. ► We present a modular view towards understanding chromosomal rearrangements. ► We consider how chromosomal rearrangements may be exploited for cancer therapy. Chromosomal rearrangements, which can lead to oncogene activation and tumour suppressor loss, are a hallmark of cancer cells. Such outcomes can result from both the repair and misrepair of DNA ends, which arise from a variety of lesions including DNA double strand breaks (DSBs), collapsed replication forks and dysfunctional telomeres. Here we review the mechanisms by which non-homologous end joining (NHEJ) and homologous recombination (HR) repair pathways can both promote chromosomal rearrangements and also suppress them in response to such lesions, in accordance with their increasingly recognised tumour suppressor function. Further, we consider how chromosomal rearrangements, together with a modular approach towards understanding their etiology, may be exploited for cancer therapy.
    Subject(s): Cancer ; Chromosomal rearrangement ; Chromosome Aberrations ; DNA ; DNA Breaks, Double-Stranded ; DNA double-strand break ; DNA Repair - genetics ; Genetic aspects ; Homologous recombination ; Humans ; Neoplasms - genetics ; Non-homologous end joining
    ISSN: 1084-9521
    E-ISSN: 1096-3634
    Source: Hellenic Academic Libraries Link
    Source: Alma/SFX Local Collection
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