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Action of polyomavirus protein in host cell cycle
Suchanová, Jiřina ; Král, Jiří (referee) ; Drda Morávková, Alena (advisor)
The polyomaviruses belong to a class of small DNA viruses that are capable to induce tumor growth within the cells infected by the virus. The course of their life cycle is entirely dependent on utilization of the infected cell mechanisms that have to be very precisely regulated. Above all, this thesis concentrates on investigating the factors that influence the course of the infected cell cycle, and also the ways in which the virus is able to interact with its control mechanisms. The polyomavirus early transcripts (T-antigens) have a main impact on the progression of the individual phases of the cell cycle. The biggest T-antigen (so called "Large T-antigen") is responsible for both the interaction with the main regulators of the cell cycle (proteins p53 and pRB) and a viral replication, immortalization of the cell and blocking of the mitotic phase of the cell cycle. The mitosis is very unfavorable to the virus because it utilizes a great amount of limited material of the cell organism that the virus needs for its own replication. According to the latest research the virus induces several changes within the cell cycle. For example, it creates a second S phase instead of the mitotic phase in the cell. It causes the accumulation of the infected cells in the late G2 phase as opposed the accumulation of...

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