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Journal of General Virology, Vol 80, 1537-1540, Copyright © 1999 by Society for General Microbiology

ARTICLES

Circular configuration of the genome of ascoviruses

XW Cheng, GR Carner and TM Brown
Clemson University, Department of Entomology, 114 Long Hall, Box 340365, Clemson, SC 29634-0365, USA

A circular configuration of genomic DNA was observed in ascoviruses isolated from two species of insects of the family Noctuidae [fall armyworm (Spodoptera frugiperda) and cotton bollworm (Helicoverpa zea)] using restriction endonuclease (REN) digestion, conventional gel electrophoresis, pulsed-field gel electrophoresis and Southern hybridization analysis. This circular configuration of ascovirus genomic DNA was established based on the difference between linear and circular DNA in the numbers of fragments resolved on agarose gel electrophoresis after single and double REN digestion. Genomic DNA of ascoviruses was found to be sheared after purification.


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