Although repair of double-strand breaks (DSBs) by gene conversion is the most accurate way to repair such lesions, in budding yeast there is a 1,000-fold increase in accompanying mutations, including interchromosomal template switches (ICTS) involving highly mismatched (homeologous) ectopic sequences. Although such events are rare and appear at a rate of 2 × 10(-7) when template jumps occur between 71% identical sequences, they are surprisingly frequent (0.3% of all repair events) when the second template is identical to the first, revealing the remarkable instability of repair DNA synthesis. With homeologous donors, ICTS uses microhomologies as small as 2 bp. Cells lacking mismatch repair proteins Msh6 and Mlh1 form chimeric recombinants with two distinct patches of microhomology, implying that these proteins are crucial for strand discrimination of heteroduplex DNA formed during ICTS. We identify the chromatin remodeler Rdh54 as the first protein required for template switching that does not affect simple gene conversion.
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 30 July 2014.
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