Identification of adenovirus 2 early genes required for induction of cellular DNA synthesis in resting hamster cells
- PMID: 7241670
- PMCID: PMC171237
- DOI: 10.1128/JVI.38.3.982-986.1981
Identification of adenovirus 2 early genes required for induction of cellular DNA synthesis in resting hamster cells
Abstract
tsAF8 cells are temperature-sensitive (ts) mutants of BHK-21 cells that arrest at the nonpermissive temperature in the G1 phase of the cell cycle. When made quiescent by serum restriction, they can be stimulated to enter the S phase by 10% serum at 34 degrees C, but not at 40.6 degrees C. Infection by adenovirus type 2 or type 5 stimulates cellular DNA synthesis in tsAF8 cells at both 34 and 40.6 degrees C. Infection of these cells with deletion Ad5dl312, Ad5dl313, Ad2 delta p305, and Ad2+D1) and temperature-sensitive (H5ts125, H5ts36) mutants of adenovirus indicates that the expression of both early regions 1A and 2 is needed to induce quiescent tsAF8 cells to enter the S phase at the permissive temperature. This finding has been confirmed by microinjection of selected adenovirus DNA fragments into the nucleus of tsAF8 cells. In addition, we have shown that additional viral functions encoded by early regions 1B and 5 are required for the induction of cellular DNA synthesis at the nonpermissive temperature.
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