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. 1981 Mar;1(3):228–236. doi: 10.1128/mcb.1.3.228

Physical analysis of the CYC1-sup4 interval in Saccharomyces cerevisiae.

P Shalit 1, K Loughney 1, M V Olson 1, B D Hall 1
PMCID: PMC369666  PMID: 6765599

Abstract

CYC1 and sup4 are part of a tightly linked cluster of genes on chromosome X in the yeast Saccharomyces cerevisiae. Using as probes previously cloned fragments containing the CYC1 and sup4 genes, we have identified and cloned the deoxyribonucleic acid (DNA) present between these genes in one strain of yeast. We find that the CYC1 and sup4 genes are approximately 21 kilobases apart. In the same strain, the meiotic map distance is approximately 3.7 centimorgans, for a ratio of 5.6 kilobases per centimorgan in this interval. The physical mapping has allowed unambiguous determination of the orientation of CYC1 and sup4 relative to each other, the centromere, and a nearby transfer ribonucleic acid (tRNA(2Ser)) gene. The spontaneous mutation cyc1-1 inactivates the CYC1 gene as well as the neighboring loci OSM1 and RAD7. We have determined that a cyc1-1-bearing strain lacks approximately 13 kilobases of single-copy DNA from the CYC1-sup4 region, including all of the CYC1 coding information. There is a sequence homologous to the middle-repetitive element Ty1 at or near the breakpoint of the cyc1-1 deletion. We discuss the possibility that Ty elements play a role in the formation of such large, spontaneous deletions, which occur frequently in this region of chromosome X in certain yeast strains.

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Selected References

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