We observed something strange recently. We restricted a vector with
NcoI/BamHI and then gel-purified a fragment of about 3kb (GTG
agarose/TBA followed by Qiagen Gel column purification. A subsequent
mini-gel showed a strong 6kb band and a faint 3 kb band. Why? Is it
possible that spontaneous ligation occurred?
Chris Boyd wrote:
>> Wilson (netson at uxmail.ust.hk) wrote:
>> : I have heard that if DNA with stickly end(s) (digested by restriction
> : enzyme e.g. EcoRI) was vortexed, they will stick together and
> : consequently inhibit ligation. This is screw up of DNA, is it possible
> : to occurred?
>> I don't believe so. For a start, how could you prove this idea? It's
> not sufficient to show that vortexing inhibits ligation, which it could
> do if the DNA gets sheared in the process (though shearing problems
> only kick in significantly with large (10s of kbs) linear molecules).
>> Best wishes,
> Chris Boyd | from, | MRC Human Genetics Unit
>chrisb at hgu.mrc.ac.uk | not | Western General Hospital
>http://www.hgu.mrc.ac.uk/~chrisb | for | Edinburgh EH4 2XU, SCOTLAND