2x vector plasmid

GIETZ at bldghsc.lan1.umanitoba.ca GIETZ at bldghsc.lan1.umanitoba.ca
Fri Jul 23 14:54:00 EST 1993

I know for a fact that I have run across (years ago) a copy of pBR322 
that is a dimer!
A direct repeat not an inverted repeat.  It seemed stable and
cannot be identified as such until you run supercoiled DNA on agarose
to compare to a standard.  I have run across many other things in my cloning
adventures that look like direct repeats and seem to be stable.  I have 
a number of plasmids with large direct repeats that seem stable in coli.  I 
recover inverted repeats of any type!  This is my $0.02 worth.
Dan Gietz
R.Daniel Gietz Ph.D.
Assistant Professor
Department of Human Genetics
University of Manitoba
770 Bannatyne Ave, Rm 250
Winnipeg, Manitoba, Canada
R3E 0W3
Tel.: (204)789-3458
Fax.: (204)786-8712
"Trying to do the Manitoba Thing"

REPLY FROM: Gietz, Dr. Dan
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From: "Johan de Boer" <jdboer at sol.UVic.CA>
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Subject: Re: 2x vector plasmid
I was also under the impression that a vector dimer would be unstable once
it starts replicating. That's why my confusion, and that's why my original
question. If someone really knows that such dimers can indeed exist I would
like to know (reference?).


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