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Ultrastructural localization of cytomegalovirus DNA synthesis in infected guinea-pig cells
Abstract:
Using electron microscopic autoradiographic techniques, the uptake of [methyl-3H] thymidine into uninfected and guinea-pig cytomegalovirus (GPCMV)-infected guinea-pig embryo (GPE) fibroblast cells was investigated. In GPCMV-infected GPE cells, [methyl-3H]thymidine uptake into cellular DNA was inhibited prior to the onset of virus DNA synthesis as well as during the entire period of virus replication. Virus DNA synthesis increased slowly during the period of active virus replication, which usually lasted from 18 to 48 h post-infection. Only the electron-dense amorphous matrices and fibrillar structures in the nuclear inclusions were associated with the tritiated labels and thus contained virus DNA.
Insights
Guinea-pig cytomegalovirus (GPCMV) infection inhibits host cell DNA synthesis, with viral DNA replication occurring in specific nuclear structures. This study reveals GPCMV
Area of Science:
- Virology
- Cell Biology
- Molecular Biology
Background:
- Guinea-pig cytomegalovirus (GPCMV) is a significant pathogen in guinea pigs.
- Understanding viral replication mechanisms is crucial for developing antiviral strategies.
Purpose of the Study:
- To investigate the impact of GPCMV infection on host cell DNA synthesis.
- To identify the sites of viral DNA replication within infected cells.
Main Methods:
- Electron microscopic autoradiography was used to track [methyl-3H] thymidine uptake.
- Guinea-pig embryo (GPE) fibroblast cells were used for the study.
- Cells were either uninfected or infected with GPCMV.
Main Results:
- [methyl-3H] thymidine uptake into cellular DNA was inhibited in GPCMV-infected cells before and during viral replication.
- Viral DNA synthesis commenced between 18 and 48 hours post-infection.
- Tritiated labels were localized to electron-dense amorphous matrices and fibrillar structures within nuclear inclusions, indicating these sites contain newly synthesized viral DNA.
Conclusions:
- GPCMV infection actively suppresses host cell DNA synthesis.
- Viral DNA replication is spatially restricted to specific structures within the nucleus.
- These findings provide insights into the molecular mechanisms of GPCMV replication.