RAD51-independent break-induced replication to repair a broken chromosome depends on a distant enhancer site

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Abstract
Without the RAD51 strand exchange protein,Saccharomyces cerevisiae cannot repair a double-strand break (DSB) by gene conversion. However, cells can repair DSBs by recombination-dependent, break-induced replication (BIR).RAD51-independent BIR is initiated more than 13 kb from the DSB. Repair depends on a 200-bp sequence adjacent to ARS310, located ∼34 kb centromere-proximal to the DSB, but does not depend on the origin activity of ARS310. We conclude that the ability of a recombination-induced replication fork to copy >130 kb to the end of the chromosome depends on a special site that enhances assembly of a processive repair replication fork.