Formation and stability of linear plasmids in a recombination deficient strain of yeast

Virginia A. Zakian, Harriet M. Blanton, Ginger Martin Dani

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Natural termini from macronuclear DNA of the ciliated protozoans Tetrahymena thermophila and Oxytricha fallax can support telomere formation in yeast. However, plasmids carrying these ciliate termini are modified by the addition of DNA which hybridizes to the synthetic oligonucleotide poly [d(C-A)], a sequence which also hybridizes to terminal restriction fragments from yeast chromosomes but not to Tetrahymena or Oxytricha macronuclear DNAs. Thus, in yeast, the creation of new telomeres on ciliate termini involves the acquisition of yeast-specific terminal sequences presumably by either recombination or non-templated DNA synthesis. The RAD52 gene is required for the majority of yeast mitotic and meiotic recombination events. Moreover, the absence of an active RAD52 gene product results in high rates of chromosome loss. Here we demonstrate that terminal restriction fragments from Tetrahymena macronuclear ribosomal DNA (rDNA) support the formation of modified telomeres in a yeast strain carrying a defect in the RAD52 gene. Moreover, linear plasmids bearing these modified ciliate termini are stably propagated in rad52- cells.

Original languageEnglish (US)
Pages (from-to)441-445
Number of pages5
JournalCurrent Genetics
Issue number6
StatePublished - Jun 1985

All Science Journal Classification (ASJC) codes

  • Genetics


  • Recombination
  • Telomeres
  • Yeast


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