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Nucleic Acids Research, Vol 24, Issue 21 4202-4209, Copyright © 1996 by Oxford University Press

ARTICLES

Large DNA fragment sizing by flow cytometry: application to the characterization of P1 artificial chromosome (PAC) clones

Z Huang, JT Petty, B O'Quinn, JL Longmire, NC Brown, JH Jett and RA Keller
Chemical Science and Technology Division, Los Alamos National Laboratory, NM 87545, USA.

A flow cytometry-based, ultrasensitive fluorescence detection technique is used to size individual DNA fragments up to 167 kb in length. Application of this technology to the sizing of P1 artificial chromosomes (PACs) in both linear and supercoiled forms is described. It is demonstrated that this method is well suited to characterizing PAC/BAC clones and will be very useful for the analysis of large insert libraries. Fluorescence bursts are recorded as individual, dye stained DNA fragments pass through a low power, focused, continuous laser beam. The magnitudes of the fluorescence bursts are linearly proportional to the lengths of the DNA fragments. The histograms of the burst sizes are generated in <3 min with <1 pg of DNA. Results on linear fragments are consistent with those obtained by pulsed-field gel electrophoresis. In comparison with pulsed-field gel electrophoresis, sizing of large DNA fragments by this approach is more accurate, much faster, requires much less DNA, and is independent of the DNA conformation.
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