Zarling D A, Temin H M
J Virol. 1975 Jan;17(1):74-84. doi: 10.1128/JVI.17.1.74-84.1976.
Three genetically distinct types of chicken sarcoma virus Bratislava 77 (B77 virus) differing in their ability to infect duck cells were identified. B77 virus type I does not infect duck cells; B77 virus type II has a low efficiency of infection of duck cells; and B77 virus type III has a high efficiency of infection of duck cells. B77 viruses type I and III are produced by spontaneous mutation during the growth of B77 virus type II in chicken cells. The spontaneous mutation of B77 virus type II TO B77 virus type III occurs with a high rate (approximately 1 mutation per 50 infected cell generations), requires cell replication, and neither occurs during the synthesis of viral DNA on an RNA template nor during the transcription of progeny viral RNA from the provirus. The rate of spontaneous mutation of B77 virus type II to B77 virus type I is greater than the rate of spontaneous mutation of B77 virus type II to B77 virus type III.
鉴定出三种基因不同类型的布拉迪斯拉发77鸡肉瘤病毒(B77病毒),它们感染鸭细胞的能力有所不同。I型B77病毒不感染鸭细胞;II型B77病毒感染鸭细胞的效率较低;III型B77病毒感染鸭细胞的效率较高。I型和III型B77病毒是II型B77病毒在鸡细胞中生长时通过自发突变产生的。II型B77病毒向III型B77病毒的自发突变发生率很高(每50代感染细胞中约有1次突变),需要细胞复制,且既不发生在RNA模板上病毒DNA的合成过程中,也不发生在从原病毒转录子代病毒RNA的过程中。II型B77病毒向I型B77病毒的自发突变率大于II型B77病毒向III型B77病毒的自发突变率。