Instability of dicentric plasmids in yeast - PubMed (original) (raw)

Instability of dicentric plasmids in yeast

C Mann et al. Proc Natl Acad Sci U S A. 1983 Jan.

Abstract

Dicentric plasmids containing either two copies of centromere 4 or one copy of centromere 4 and one copy of centromere 3 in the yeast plasmid vector YRp17 were constructed in vitro and introduced into yeast cells by DNA transformation. The resulting colonies were heterogeneous for a mixed population of rearranged plasmids. The rearrangements always involved deletion of one or both centromere sequences originally present on the plasmid. Heterogeneity was due to the continued production of deleted plasmids from a pool of unrearranged dicentric plasmids maintained within some of the yeast cells in the colony. The RAD52 gene product is known to be required for the repair of DNA double-strand breaks in yeast. Transformation of rad52 mutant yeast cells with dicentric plasmids gave rearranged plasmids similar to those observed with RAD+ yeast cells, but the transformation frequency was only 5-10% compared to transformation with monocentric plasmids. Also, the ratio of unrearranged dicentric plasmid to deleted plasmids was greatly reduced in the rad52-transformed cells. These observations are consistent with a model in which centromeric DNA sequences can interact independently with the yeast cell spindle apparatus. Occasional movement of centromeres to opposite poles may result in mechanical breakage of plasmid sequences. Plasmids deleted for one or both centromere sequences can be obtained from these broken molecules and are resistant to further rearrangement.

PubMed Disclaimer

Similar articles

Cited by

References

    1. Nature. 1981 Jul 23;292(5821):306-11 - PubMed
    1. J Theor Biol. 1976 Jun;59(1):97-106 - PubMed
    1. Genetics. 1941 Mar;26(2):234-82 - PubMed
    1. Nature. 1980 Oct 9;287(5782):504-9 - PubMed
    1. Proc Natl Acad Sci U S A. 1979 Mar;76(3):1035-9 - PubMed

Publication types

MeSH terms

LinkOut - more resources