An experimental system for the study of mutations in the HMR locus of Saccharomyces cerevisiae: the insertion of Ty into HMRa vs. the conversion of HMRa to HMRalpha.

Abstract excerpt

A cross between a sir4-11 strain (sir4-11 HMLalpha MATalpha HMRa, non-mating type) and an a-mating strain (SIR(+) HMLalpha MATa HMRa) of Saccharomyces cerevisiae forms diploid clones at a frequency of 5 x 10(-6), but the obtained diploid clones often (>70%) have altered forms of the HMRa-containing restriction fragment, designated @ HMRa'. We previously found that some HMRa's are associated with the conversion of...

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