Nucleic Acids Research, 1987, Vol. 15, No. 24 10345-10354
© 1987
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Size heterogeneity of EBV and mitochondrial DNAs in Burkitt's lymphoma lines
Department of Virology, St Mary's Hospital Medical School London W2 1PG 1Department of Virology, Royal Postgraduate Medical School Hammersmith Hospital London W12 OHS, UK
Received August 28, 1987. Revised November 24, 1987. Accepted November 24, 1987.
A simple, reproducible affinity chromatography method has been adapted for separation of high molecular weight supercoiled circular molecules from mammalian cells. Electron microscopic analysis of EB viral DNA obtained by this method, frcm the non-producer Burkitt's lymphana line Raji, revealed monomer-sized viral molecules only. In contrast, the EB viral episomes from recently established human producer lines BL-8 and LY91 were very heterogeneous in size, some being considerably smaller and others much larger than the monomeric DNA. The former are probably related to defective viral species in the B-cell population, but the origin of the latter are as yet unclear. All cell lines contained both monOmers and concatemers of mitochondrial DNA; among the latter, molecules apparently greater than 100 kb were observed in the population.
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