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Dok1 and Dok2 proteins play a crucial role in myeloid cell proliferation as demonstrated by Dok1 and Dok2 gene inactivation, which induces a myeloproliferative disease in aging mice. In this study, we show that Dok1/Dok2 deficiency affects myeloproliferation even at a young age. An increase in the cellularity of multipotent progenitors is observed in young Dok1/Dok2-deficient mice. This is associated with an increase in the cells undergoing cell cycle, which is restricted to myeloid committed progenitors. Furthermore, cellular stress triggered by 5-fluorouracil (5-FU) treatment potentiates the effects of the loss of Dok proteins on multipotent progenitor cell cycle. In addition, Dok1/Dok2 deficiency induces resistance to 5-FU-induced hematopoietic stem cell exhaustion. Taken together, these results demonstrate that Dok1 and Dok2 proteins are involved in the control of hematopoietic stem cell cycle regulation.

Dok1 and Dok2 Proteins Regulate Cell Cycle in Hematopoietic Stem and Progenitor Cells