Abstract
The maintenance of the mammalian blood system depends on hematopoietic stem cells (HSCs), which are a rare class of adult stem cells with self-renewal and multilineage differentiation capacities. The homeostasis of hematopoietic stem cells is finely tuned by a variety of endogenous and exogenous regulatory factors, and disrupted balance will lead to hematological diseases including leukemia and anemia. Recently, emerging studies have illustrated the cellular and molecular mechanisms underlying the regulation of HSC homeostasis. Particularly, the rapid development of second-generation sequencing technologies has uncovered that many small noncoding RNAs (ncRNAs) are highly expressed in HSCs, including snoRNAs, miRNAs, tsRNAs, circular RNAs, etc. In this study, we will summarize the essential roles and regulatory mechanisms of these small ncRNAs in maintaining HSC homeostasis. Overall, this review provides up-to-date information in the regulation of HSC homeostasis by small ncRNAs, which sheds light into the development of therapeutic strategies against hematopoietic malignancies.
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