Abstract
Homologous recombination occurs at a greatly elevated frequency in meiosis compared to mitosis and is initiated by programmed double-strand DNA breaks (DSBs). DSBs do not occur at uniform frequency throughout the genome in most organisms, but occur preferentially at a limited number of sites referred to as hotspots. The location of hotspots have been determined at nucleotide-level resolution in both the budding and fission yeasts, and while several patterns have emerged regarding preferred locations for DSB hotspots, it remains unclear why particular sites experience DSBs at much higher frequency than other sites with seemingly similar properties. Short sequence motifs, which are often sites for binding of transcription factors, are known to be responsible for a number of hotspots. In this study we identified the minimum sequence required for activity of one of such motif identified in a screen of random sequences capable of producing recombination hotspots. The experimentally determined sequence, GGTCTRGACC, closely matches the previously inferred sequence. Full hotspot activity requires an effective sequence length of 9.5 bp, whereas moderate activity requires an effective sequence length of approximately 8.2 bp and shows significant association with DSB hotspots. In combination with our previous work, this result is consistent with a large number of different sequence motifs capable of producing recombination hotspots, and supports a model in which hotspots can be rapidly regenerated by mutation as they are lost through recombination.
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Acknowledgements
This work was supported by the Niagara University Research Council and the Academic Center for Integrated Sciences (ACIS) and a Barbara S. Zimmer award to S.J.F.
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Steven J. Foulis declares that he has no conflict of interest. Kyle R. Fowler declares that he has no conflict of interest. Walter W. Steiner declares that he has no conflict of interest.
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Foulis, S.J., Fowler, K.R. & Steiner, W.W. Sequence requirement of the ade6-4095 meiotic recombination hotspot in Schizosaccharomyces pombe . Genetica 146, 65–74 (2018). https://doi.org/10.1007/s10709-017-9997-3
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DOI: https://doi.org/10.1007/s10709-017-9997-3