Characterization of SV40-transformed human liver cells before and after passage through crisis.

SV40-transformed human liver cells could be passed through crisis after transfection with various DNAs (SV40, BKV, or salmon sperm). The pre- and post-crisis cells were compared with respect to growth behavior and the state of the viral genome. Comparison of the viral inserts in the pre- and post-crisis cells showed minor changes in the integration pattern of the SV40 DNA after recovery from crisis.