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Genetics, Vol 133, 825-835, Copyright © 1993
INVESTIGATIONS |
Marker Effects of G to C Transversions on Intragenic Recombination and Mismatch Repair in Schizosaccharomyces pombe
P. Schar and J. Kohli
Institute of General Microbiology, University of Bern, CH-3012 Bern, Switzerland
G to C transversion mutations show very strong allele-specific marker effects on the frequency of wild-type recombinants in intragenic two-factor crosses. Here we present a detailed study of the marker effect of one representative, the ade6-M387 mutation of Schizosaccharomyces pombe. Crosses of M387 with other mutations at varying distance reveal highly increased prototroph frequencies in comparison with the C to T transition mutation ade6-51 (control without any known marker effect) located four nucleotides from M387. The marker effect of M387 is strongest (>40-fold) for crosses with mutations less than 15 nucleotides from M387. It decreases to an intermediate level (5-10-fold) in crosses with mutations located 25-150 base pairs from M387/51 and is very low in crosses with mutations beyond 200 base pairs. On the basis of these results and the quantitation of the low efficiency of C/C mismatch repair presented in the accompanying publication we propose the existence of at least two different types of mechanisms for base mismatch repair in fission yeast. The major system is suggested to recognize all base mismatches except C/C with high efficiency and to generate long excision tracts (approximately 100 nucleotides unidirectionally). The minor system is proposed to recognize all base mismatches including C/C with low and variable efficiency and to have short excision tracts (approximately 10 nucleotides unidirectionally). We estimate from the M387 marker effect that the minor system accounts for approximately 1-8% repair of non-C/C mismatches (depending on the nature of the mutation) in fission yeast meiosis.
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