Genetic stability of African swine fever virus grown in monkey kidney cells

Viral DNA subpopulations were produced when the ASFV was grown in monkey kidney MS cells. They were detected after 44 passages but not during the first 14 passages or in the unadapted ASFV E 70 strain grown in pig leukocytes. Different viral variants were isolated and their genomes were characterized. Restriction enzyme site variations were detected in both terminal fragments, Cla I-M and Sal I-F, and in the internal fragments Clal-O and Sma I-H. These variations result in changes in the size of the viral genome which ranges from 156 Kbp to 170 Kbp. © 1988 Springer-Verlag

African swine fever virus DNA deletions and additions during adaptation to growth in monkey kidney cells

Restriction enzyme cleavage maps for the fragments produced by Cla I, Sal I and Sma I have been constructed for African swine fever virus (ASFV) DNA grown in pig leukocytes (strain E70 L6) and after adaptation to growth in MS monkey kidney cells (strain E70MS14). The mapping data revealed that before adaptation to growth in MS cells, the size of the DNA from ASFV strain E70 L6 was l73 Kbp and after adaptation it was only 156 Kbp. The decrease in size was produced by deletions and additions mainly in the terminal regions of the genome. These genetic variations were located between 0.0 to 0.01 m.u. (Cla I-M1 fragment), 0.04 to 0.14 m.u. (Sma I-B1, Sal I-A1 fragments), 0.51 to 0.52 m.u. (Cla I-O fragment), 0.84 to 0.86 m.u. (Sma I-H1), 0.95 to 0.97 m.u. (Cla I-A1, Cla I-G1 fragments) and 0.99 to 1.0 m.u. (Cla I-G1) on viral genome of ASFV grown in pig leukocytes. © 1987 Springer-Verlag