Nucleic Acids Research, 1991, Vol. 19, No. 6 1291-1296
© 1991
GENOME STRUCTURE AND MAPPING |
Secondary pulsed field gel electrophoresis: a new method for faster separation of larger DNA molecules
1Human Genome Center, Lawrence Berkeley Laboratory Berkeley, CA 94720, USA 2Department of Molecular and Cell Biology, University of California Berkeley, CA 94720, USA
* To whom correspondence should be addressed
Received November 7, 1990. Revised February 21, 1991. Accepted February 21, 1991.
A novel technique, which we call secondary pulsed field gel electrophoresis (SPFG) has been developed. In SPFG, short pulses are applied in the direction of net migration of the DNA in addition to the reorienting pulses used in conventional pulsed field electrophoresis (PFG). Experimental results show that SPFG extends and improves the electrophoretic resolution of DNA for molecules from 0.5 megabase pairs to over 10 megabase pairs in size. This Improved resolution is obtained with dramatically shorter run times. Thus SPFG appears to circumvent a number of the key limitations In previous PFG protocols.