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Avian polyomavirus mutants with deletions in the VP4-encoding region show deficiencies in capsid assembly and virus release, and have reduced infectivity in chicken
- Source :
- The Journal of general virology. 88(Pt 3)
- Publication Year :
- 2007
-
Abstract
- Avian polyomavirus (APV) is the causative agent of an acute fatal disease in psittacine and some non-psittacine birds. In contrast to mammalian polyomaviruses, the APV genome encodes the additional capsid protein VP4 and its variant VP4Δ, truncated by an internal deletion. Both proteins induce apoptosis. Mutation of their common initiation codon prevents virus replication. Here, the generation of replication competent deletion mutants expressing either VP4 or VP4Δ is reported. In contrast to infection with wild-type virus, chicken embryo cells showed no cytopathic changes after infection with the mutants, and induction of apoptosis as well as virus release from the infected cells were delayed. Electron microscopy revealed the presence of a high proportion of small particles and tubules in preparations of the VP4 deletion mutant, indicating a scaffolding function for VP4. Wild-type and mutant viruses elicited neutralizing antibodies against APV after intramuscular and intraperitoneal infection of chicken; however, VP4-specific antibodies were only detected after infection with wild-type virus. Using the oculonasal route of infection, seroconversion was only observed in chickens infected with the wild-type virus, indicating a strongly reduced infectivity of the mutants. Based on the biological properties of the deletion mutants, they could be considered as candidates for APV marker vaccines.
- Subjects :
- viruses
Mutant
Apoptosis
Chick Embryo
medicine.disease_cause
Antibodies, Viral
Virus Replication
Virus
Cytopathogenic Effect, Viral
Microscopy, Electron, Transmission
Neutralization Tests
Virology
medicine
Animals
Cells, Cultured
Poultry Diseases
Sequence Deletion
Infectivity
Mutation
Polyomavirus Infections
biology
Virus Assembly
Virion
Virus Release
Viral replication
Capsid
biology.protein
Capsid Proteins
Antibody
Polyomavirus
Chickens
Subjects
Details
- ISSN :
- 00221317
- Volume :
- 88
- Issue :
- Pt 3
- Database :
- OpenAIRE
- Journal :
- The Journal of general virology
- Accession number :
- edsair.doi.dedup.....50bfa2fb37bc40304d09f39011c85fe1