A three‐dimensional plot for the display of transverse pore gradient gel electrophoresis data: Application to a kinetoplast DNA fragment of planar circular conformation

A 219 bp fragment of kinetoplast DNA from Crithidia fasciculata has previously been shown to exhibit a gel concentration dependent, anomalously low migration rate in 3–10% polyacrylamide transverse pore gradient gels relative to that of straight standards. The anomaly was interpreted in accordance with previous results of Marini et al. [1] as being due to the planar circular conformation of the fragment. The transverse pore gradient gel pattern is displayed here as a three‐dimensional plot of migration distance vs. gel concentration and DNA length for the kinetoplast fragment and straight DNA standards. The plot yields a smooth surface for the standards clearly separated from the curve of the kinetoplast DNA fragment. Thus, transverse gradient gel electrophoresis in conjunction with the three‐dimensional plot provides a unique method for the recognition of abnormal conformational features of DNA on the basis of electrophoretic mobility in a pore‐size gradient.