Host Range Mutants of Polyoma Virus

Host range mutants of polyoma virus.

A line of polyoma-transformed mouse cells has been isolated which is fully susceptible to lytic infection by polyoma virus. This line has been used to select virus mutants which have lost most or all of their ability to grow in the untransformed parental line while retaining the ability to grow in the transformed derivative. These virus mutants are also defective in their ability to transform c...

Deficiency in histone acetylation in nontransforming host range mutants of polyoma virus.

Histones H3 and H4 derived from transforming wild-type polyoma and simian virus 40 particles show extensive acetylation compared to the histones of the host cells. The same histone fractions derived from nontransforming host range mutants of polyoma virus fail to show this high degree of acetylation.

Host range transforming gene of polyoma virus plays a role in virus assembly.

Polyoma virus host range transforming (hr-t) mutants are blocked in virion assembly. In normal 3T3 cells, a nonpermissive host, these mutants synthesize 30-40% as much viral DNA and 80-100% as much capsid proteins as does wild-type virus and yet produce only 1-2% as much infectious virus. Intermediates in virion assembly have been followed by [3H]thymidine incorporation. hr-t mutants synthesize...

Broadbean wilt virus - identification,host range and distribution in the fars province of iran

In vivo characteristics of temperature-sensitive host range mutants of herpes simplex virus type 2.

The in vivo properties of four host range temperature-sensitive (ts) mutants of herpes simplex virus type 2 (HSV-2) were correlated with known in vitro characteristics. Mutants and parental virus were inoculated into newborn and weanling mice and weanling hamsters by intracranial and subcutaneous routes, and into weanling rabbits by corneal scarification. In all cases the pattern of attenuation...