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The smt-0 mutation which abolishes mating-type switching in fission yeast is a deletion

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Abstract

Mating-type switching in the fission yeast, S. pombe, is initiated by a DNA double-strand break (DSB) between the mat1 cassette and the H1 homology box. The mat1-cis-acting mutant, smt-0, abolishes mating-type switching and is shown here to be a 263-bp deletion. This deletion starts in the middle of the H1 homology box, 31 bp from the site of the DSB, and extends into the flanking region distal to mat1. The sequence of the region distal to H1 in the wild-type is also presented. In this region we observe a bias in the distribution of purine residues between the two DNA strands.

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Authors and Affiliations

  1. Institute of Genetics, University of Copenhagen, Øster Farimagsgade 2A, DK-1353, Copenhagen K, Denmark

    Unnur Styrkársdóttir, Richard Egel & Olaf Nielsen

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  1. Unnur Styrkársdóttir
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  2. Richard Egel
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  3. Olaf Nielsen
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Communicated by K. Wolf

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Styrkársdóttir, U., Egel, R. & Nielsen, O. The smt-0 mutation which abolishes mating-type switching in fission yeast is a deletion. Curr Genet 23, 184–186 (1993). https://doi.org/10.1007/BF00352020

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  • DOI: https://doi.org/10.1007/BF00352020

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