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Pheasant virus: new class of ribodeoxyvirus
Summary
Researchers discovered novel avian RNA viruses in pheasant cells, termed pheasant viruses (PV). These viruses possess RNA-dependent DNA polymerase and differ from known avian leukosis-sarcoma viruses and reticuloendotheliosis viruses.
Area of Science:
- Virology
- Molecular Biology
- Oncology
Background:
- Endogenous viruses can integrate into host genomes, influencing cellular functions.
- Avian sarcoma viruses are retroviruses known to cause tumors in birds.
- Understanding viral diversity is crucial for disease control and evolutionary studies.
Purpose of the Study:
- To identify and characterize novel viruses in pheasant cells.
- To determine the relationship of these pheasant viruses (PV) to known avian retroviruses.
- To investigate the enzymatic properties and genetic makeup of PV.
Main Methods:
- Cocultivation of pheasant embryo cells with Rous sarcoma virus-infected chicken cells.
- Electron microscopy for viral morphology assessment.
- Analysis of viral RNA size, protein composition, and enzymatic activity (RNA-dependent DNA polymerase).
- Serological tests for group-specific antigens.
- Nucleic acid hybridization studies.
Main Results:
- Detection of endogenous pheasant viruses (PV) in pheasant cells.
- PV exhibited similarities to avian leukosis-sarcoma viruses (ALSV) in morphology, RNA size, polymerase activity, and growth.
- PV acted as a helper virus for glycoprotein-defective Rous sarcoma virus.
- PV differed from ALSV and reticuloendotheliosis virus in lacking ALSV group-specific antigens, having distinct protein composition, failing to complement defective Rous sarcoma virus polymerase, and showing no RNA homology.
Conclusions:
- Pheasant viruses (PV) represent a new class of RNA viruses.
- PV possess RNA-dependent DNA polymerase activity.
- PV are distinct from previously characterized avian retroviruses, suggesting a novel viral lineage.