Abstract
Spontaneous secondary mutations of the ochre suppressor SUP6 were selected in a haploid strain of Saccharomyces cerevisiae . Unselected tetrads were dissected from crosses heterozygous for one of three alleles of SUP6 and for three other loci in this region which span a length of 14 map units (his2, cdc14 and met10). The study showed that all of these markers were characterized by high frequency of meiotic gene conversion and long conversion lengths which frequently extended into adjacent marked loci. Despite the high conversion frequency of SUP6 , recombination between alleles of this locus reached a maximum frequency of only 2 x 10-3 prototrophs/spore. Although the allelic recombination frequencies were not distance dependent and consequently could not be used to order the alleles, the inequality between the two recombinant outside marker combinations among selected intragenic recombinants produced an internally consistent map of the suppressor locus. Recombination at SUP6 (whether detected as conversion in tetrads or the production of recombinants among random spores) was accompanied by significantly less than 50% outside marker recombination.
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Selected References
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- Fogel S., Mortimer R. K. Informational transfer in meiotic gene conversion. Proc Natl Acad Sci U S A. 1969 Jan;62(1):96–103. doi: 10.1073/pnas.62.1.96. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gajewski H. Aufnahmetechnik bei der Mammographie. Rontgenpraxis. 1967 Aug;20(8):177–188. [PubMed] [Google Scholar]
- Gilmore R. A., Stewart J. W., Sherman F. Amino acid replacements resulting from super-suppression of nonsense mutants of iso-1-cytochrome c from yeast. J Mol Biol. 1971 Oct 14;61(1):157–173. doi: 10.1016/0022-2836(71)90213-0. [DOI] [PubMed] [Google Scholar]
- Lawrence C. W., Sherman F., Jackson M., Gilmore R. A. Mapping and gene conversion studies with the structural gene for iso-1-cytochrome C in yeast. Genetics. 1975 Dec;81(4):615–629. doi: 10.1093/genetics/81.4.615. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Moore C. W., Sherman F. Role of DNA sequences in genetic recombination in the iso-1-cytochrome c gene of yeast. I. Discrepancies between physical distances and genetic distances determined by five mapping procedures. Genetics. 1975 Mar;79(3):397–418. doi: 10.1093/genetics/79.3.397. [DOI] [PMC free article] [PubMed] [Google Scholar]