منابع مشابه
Dicentric breakage at telomere fusions.
Nonhomologous end-joining (NHEJ) inhibition at telomeres ensures that native chromosome ends do not fuse together. But the occurrence and consequences of rare telomere fusions are not well understood. It is notably unclear whether a telomere fusion could be processed to restore telomere ends. Here we address the behavior of individual dicentrics formed by telomere fusion in the yeast Saccharomy...
متن کاملTrapping Rap1 at the telomere to prevent chromosome end fusions.
The prevention of nonhomologous end-joining (NHEJ) reactions between chromosome ends is crucial for maintaining genome stability. Although this protective function is known to be fulfilled by a core of conserved telomeric proteins that are collectively known as Shelterin, its mechanistic details remain a mystery. In this issue, Sarthy et al (2009) lend fresh insight by developing an ingenious m...
متن کاملA STUbL wards off telomere fusions.
Protection of chromosomal ends from erroneous recognition as double-strand breaks (DSBs) is critical for maintaining genome integrity. Unprotected ends can activate DNA repair pathways leading to catastrophic fusions or rearrangements of chromosomes. A study in The EMBO Journal identifies Uls1 as a new player in this endprotection process, utilizing SUMO and ubiquitin modifications to prevent c...
متن کاملTelomere Protection without a Telomerase The Role of ATM and Mre11 in Drosophila Telomere Maintenance
The conserved ATM checkpoint kinase and the Mre11 DNA repair complex play essential and overlapping roles in maintaining genomic integrity. We conducted genetic and cytological studies on Drosophila atm and mre11 knockout mutants and discovered a telomere defect that was more severe than in any of the non-Drosophila systems studied. In mutant mitotic cells, an average of 30% of the chromosome e...
متن کاملSister chromatid telomere fusions, but not NHEJ-mediated inter-chromosomal telomere fusions, occur independently of DNA ligases 3 and 4.
Telomeres shorten with each cell division and can ultimately become substrates for nonhomologous end-joining repair, leading to large-scale genomic rearrangements of the kind frequently observed in human cancers. We have characterized more than 1400 telomere fusion events at the single-molecule level, using a combination of high-throughput sequence analysis together with experimentally induced ...
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ژورنال
عنوان ژورنال: Genes & Development
سال: 2010
ISSN: 0890-9369
DOI: 10.1101/gad.571510