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Exp Cell Res. 1986 Jul;165(1):29-40.

Characterization of DNA sequences associated with residual nuclei of Saccharomyces cerevisiae.


We have used two different approaches to determine whether particular DNA sequences are specifically associated with high-salt-treated residual nuclei of Saccharomyces cerevisiae. First, libraries of yeast DNA in phage lambda were probed with nick-translated total nuclear or residual nuclear DNA from unsynchronized yeast cells. None of the plaques gave a significantly stronger or weaker signal with the residual nuclear probe than with the total nuclear probe. Second, DNA was purified from whole nuclei or residual nuclei which had been isolated from cells in G1, G1/S, early S, or nuclear division. This DNA was "dot-blotted" and then probed with specific yeast DNA sequences. Ribosomal DNA was 2- to 3-fold enriched in residual nuclei in late G1, G1/S, and early S, and 2 microns plasmid DNA sequences were 3- to 5-fold depleted during nuclear division and early G1. However, ARS1, TRP1, CEN6, and a telomere sequence were neither enriched nor depleted at any time during the cell cycle.

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