I have seen several studies where two ARS/CEN plasmids that share
the same ARS element but different CEN elements (and selectable
markers) are maintained together in S. cerevisiae.
I have tried to co-introduce two plasmids into the same haploid
strain of S. cerevisiae. So far I have been unable to select for
transformants that contain both plasmids. Plating the same
transformations under conditions that select for a marker on one
plasmid or the other works.
Both these plasmids contain the same CEN element (CEN3). Obviously
diploid yeast have no problem having two copies of CEN3. A casual
sequence analysis indicates that all CEN elements have very similar
So has anyone else encountered a problem in "co-maintaining" two
plasmids that contain the same CEN element. I have just tried to
introduce the two plasmids sequentially into the strain -- and
should know if that has worked 2 - 3 days.
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