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Kalaszczynska, Ilona; Geng, Yan; Iino, Tadafumi; Mizuno, Shin-ichi; Choi, Yoon; Kondratiuk, Ilona; Silver, Daniel P.; Wolgemuth, Debra J.; Akashi, Koichi; Sicinski, Piotr
Cell, 07/2009, Letnik: 138, Številka: 2Journal Article
Cyclins are regulatory subunits of cyclin-dependent kinases. Cyclin A, the first cyclin ever cloned, is thought to be an essential component of the cell-cycle engine. Mammalian cells encode two A-type cyclins, testis-specific cyclin A1 and ubiquitously expressed cyclin A2. Here, we tested the requirement for cyclin A function using conditional knockout mice lacking both A-type cyclins. We found that acute ablation of cyclin A in fibroblasts did not affect cell proliferation, but led to prolonged expression of another cyclin, cyclin E, across the cell cycle. However, combined ablation of all A- and E-type cyclins extinguished cell division. In contrast, cyclin A function was essential for cell-cycle progression of hematopoietic and embryonic stem cells. Expression of cyclin A is particularly high in these compartments, which might render stem cells dependent on cyclin A, whereas in fibroblasts cyclins A and E play redundant roles in cell proliferation.
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in: SICRIS
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