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- W1909200062 abstract "Abstract The transcription factor c-Myb was originally identified as a transforming oncoprotein encoded by two avian leukemia viruses. Subsequently, through the generation of mouse models that affect its expression, c-Myb has been shown to be a key regulator of hematopoiesis, including having critical roles in hematopoietic stem cells (HSCs). The precise function of c-Myb in HSCs although remains unclear. We have generated a novel c-myb allele in mice that allows direct observation of c-Myb protein levels in single cells. Using this reporter line we demonstrate that subtypes of HSCs can be isolated based upon their respective c-Myb protein expression levels. HSCs expressing low levels of c-Myb protein (c-MyblowHSC) appear to represent the most immature, dormant HSCs and they are a predominant component of HSCs that retain bromodeoxyuridine labeling. Hematopoietic stress, induced by 5-fluorouracil ablation, revealed that in this circumstance c-Myb-expressing cells become critical for multilineage repopulation. The discrimination of HSC subpopulations based on c-Myb protein levels is not reflected in the levels of c-myb mRNA, there being no more than a 1.3-fold difference comparing c-Myblow and c-MybhighHSCs. This illustrates how essential it is to include protein studies when aiming to understand the regulatory networks that control stem cell behavior. Stem Cells 2015;33:479–490" @default.
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- W1909200062 date "2015-01-22" @default.
- W1909200062 modified "2023-10-17" @default.
- W1909200062 title "Determining c-Myb Protein Levels Can Isolate Functional Hematopoietic Stem Cell Subtypes" @default.
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- W1909200062 doi "https://doi.org/10.1002/stem.1855" @default.
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