Extensive DNA End Processing by Exo1 and Sgs1 Inhibits Break-Induced Replication
نویسندگان
چکیده
منابع مشابه
Extensive DNA End Processing by Exo1 and Sgs1 Inhibits Break-Induced Replication
Homology-dependent repair of DNA double-strand breaks (DSBs) by gene conversion involves short tracts of DNA synthesis and limited loss of heterozygosity (LOH). For DSBs that present only one end, repair occurs by invasion into a homologous sequence followed by replication to the end of the chromosome resulting in extensive LOH, a process called break-induced replication (BIR). We developed a B...
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In budding yeast, an HO endonuclease-inducible double-strand break (DSB) is efficiently repaired by several homologous recombination (HR) pathways. In contrast to gene conversion (GC), where both ends of the DSB can recombine with the same template, break-induced replication (BIR) occurs when only the centromere-proximal end of the DSB can locate homologous sequences. Whereas GC results in a sm...
متن کاملSgs1 Helicase and Two Nucleases Dna2 and Exo1 Resect DNA Double-Strand Break Ends
Formation of single-strand DNA (ssDNA) tails at a double-strand break (DSB) is a key step in homologous recombination and DNA-damage signaling. The enzyme(s) producing ssDNA at DSBs in eukaryotes remain unknown. We monitored 5'-strand resection at inducible DSB ends in yeast and identified proteins required for two stages of resection: initiation and long-range 5'-strand resection. We show that...
متن کاملBreak-induced DNA replication.
Recombination-dependent DNA replication, often called break-induced replication (BIR), was initially invoked to explain recombination events in bacteriophage but it has recently been recognized as a fundamentally important mechanism to repair double-strand chromosome breaks in eukaryotes. This mechanism appears to be critically important in the restarting of stalled and broken replication forks...
متن کاملRelationship of DNA degradation by Saccharomyces cerevisiae exonuclease 1 and its stimulation by RPA and Mre11-Rad50-Xrs2 to DNA end resection.
Homologous recombination is a major pathway for repair of DNA double-strand breaks. This repair process is initiated by resection of the 5′-terminated strand at the break site. In yeast, resection is carried out by three nucleolytic complexes: Mre11-Rad50-Xrs2, which functions at the initial step and also stimulates the two processive pathways, Sgs1-Dna2 and Exonuclease 1 (Exo1). Here we invest...
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ژورنال
عنوان ژورنال: PLoS Genetics
سال: 2010
ISSN: 1553-7404
DOI: 10.1371/journal.pgen.1001007