Question on basic cloning theory
rockyho at hotmail.com
Wed May 2 11:05:49 EST 2001
On Wed, 02 May 2001 10:56:52 +0100, Simon Andrews
<simon.andrews at bbsrc.ac.uk> wrote:
>> Can anyone tell me:
>> Is there only one plasmid goes into single competent cell?
>> If no, how can I make sure I get a unique clone from the single
>> bacterial colony?
>Bacteria have inbuilt mechanisms for regulating the copy number of a
>particular plasmid they carry. (Look for information on partitioning
>It is possible that the larger product is toxic (maybe only mildly) to
>the cell so there is an evolutionary pressure to delete part of this.
>We have had clones which were unstable for this reason, and gave bands
>of varying size when prepped. Try using a vector with transcriptional
>control if this might be a problem.
Thanks for information
remove no-spam to reply by mail
More information about the Methods