Kathy Baynton baynton at
Sat Nov 2 06:16:58 EST 1996

I am currently using electroporation to transfect my yeast with the 
desired plasmid and was wondering if anyone knew what might be the level 
of cotransformation using such a technique.  Most people I've talked 
with suggest that this technique has a lower level of cotransformation 
than either the lithium chloride, PEG or spheroplasting techniques.  But 
some tests I've performed which enables the detection of two different 
plasmids present in a single yeast colony arising after transformation 
with an equal mixture of the two plasmids suggests that the level of 
cotransformation can vary from 1-10%.  Carrier DNA is not used and is 
usually not included in such a procedure.  I was wondering if anyone 
knows any more about cotransformation levels using any of the common (or 
not so common) transfection techniques and if possible, how can this be 
minimized, IF at all possible. ANY suggestions, comments etc. would be 
really appreciated!!  Thanks!!

Kathy Baynton

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