Campione-Piccardo J, Rawls W E, Bacchetti S
J Virol. 1979 Aug;31(2):281-7. doi: 10.1128/JVI.31.2.281-287.1979.
A technique for selecting herpes simplex viruses expressing the viral thymidine kinase (TK+) from a population of predominantly TK- viruses was developed. This was accomplished by infecting TK- cells and incubating the cultures under a liquid overlay medium containing methotrexate. Since the TK- cells survive in this medium for only a limited period of time, it was necessary to add fresh uninfected TK- cells 48 h after infection. The technique allowed the detection and quantitation of the TK+ virus fraction in mixtures of TK+ and TK- viruses where the TK+ fraction was present in frequencies as low as 10(-5). It was also used to estimate reversion frequencies and to obtain and analyze TK+ revertants from TK- mutant strains of herpes simplex virus type 1.
开发了一种从主要为胸苷激酶阴性(TK-)的病毒群体中选择表达病毒胸苷激酶(TK+)的单纯疱疹病毒的技术。这是通过感染TK-细胞并在含有甲氨蝶呤的液体覆盖培养基下培养来实现的。由于TK-细胞在这种培养基中仅能存活有限的时间,因此有必要在感染后48小时添加新鲜的未感染TK-细胞。该技术能够检测和定量TK+和TK-病毒混合物中TK+病毒组分,其中TK+组分的频率低至10^(-5)。它还用于估计回复频率,并从1型单纯疱疹病毒的TK-突变株中获得并分析TK+回复株。