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Temperature-sensitive Mutants of Newcastle Disease Virus Affecting Interferon Induction

Department of Measles Virus, National Institute of Health of Japan, 4-7-1, Gakuen, Musashimurayama-shi, Tokyo 190-12, Japan

Temperature-sensitive (ts) mutants of Newcastle disease virus (NDV) were isolated and studied for interferon (IFN) induction in primary chick embryo (CE) cells. At the non-permissive temperature (41 °C), there was no viral RNA synthesis or IFN induction by u.v.-treated virions except for ts-3 (RNA⁺), which did synthesize RNA at 41 °C, and whose u.v.-treated virions did induce IFN at this temperature. Another mutant (ts-4) induced IFN without irradiation, at the permissive temperature (37 °C). The minimum u.v. target size for IFN inducibility was unaffected by the mutation and corresponded to about 5% of the genome required for the expression of infectivity. These results support the hypothesis that the appearance of NDV RNA immediately after infection (primary transcription) plays a key role in IFN induction.

Keywords: IFN induction, NDV mutants, u.v. target size, primary transcription

Received 27 October 1982; accepted 1 February 1983.