Symmetric self-renewal and dormancy define functional fetal liver hematopoietic stem cells at single cell resolution
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE233031 | GEO | 2023/05/24
REPOSITORIES: GEO
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Project description:Symmetric self-renewal and dormancy define functional fetal liver hematopoietic stem cells at single cell resolution
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Project description:Stem cells balance cellular fates through asymmetric and symmetric divisions in order to self-renew or to generate downstream progenitors. Symmetric commitment divisions in stem cells are required for rapid regeneration during tissue damage and stress. The control of symmetric commitment remains poorly defined. N6-methyladenosine (m6A), the most abundant posttranscriptional mRNA modification controls cellular states and its abundance is dysregulated in cancer. Here we show that mRNA methylation controls symmetric commitment and cell identity of hematopoietic stem cells (HSCs). Using single-cell RNA sequencing (scRNA-seq) in combination with transcriptomic profiling of HSPCs (hematopoietic stem and progenitor cells) from control and m6A methyltransferase Mettl3 conditional knockout mice, we found that m6A-deficient HSC fail to symmetrically differentiate. Dividing HSCs are expanded and are blocked in an intermediate state that molecularly and functionally resembles multipotent progenitors. Mechanistically, RNA methylation controls Myc mRNA abundance in differentiating HSCs. Importantly, we identified MYC as a new marker for HSC asymmetric and symmetric commitment. Furthermore, forced expression of MYC rescued m6A’s requirement for engraftment indicating its importance in the early stage of HSC cellular fate. Overall our results indicate that RNA methylation is critical for normal blood homeostasis and may provide a general mechanism for how stem cells regulate differentiation fate choice.
2019-07-25 | GSE132357 | GEO
Project description:Bone marrow hematopoietic stem cells (HSCs) are crucial to maintain lifelong production of all blood cells. Although HSCs divide infrequently, it is thought that the entire HSC pool turns over every few weeks, suggesting that HSCs regularly enter and exit cell cycle. Here, we combine flow cytometry with label-retaining assays (BrdU and histone H2B-GFP) to identify a population of dormant mouse HSCs (d-HSCs) within the lin(-)Sca1+cKit+CD150+CD48(-)CD34(-) population. Computational modeling suggests that d-HSCs divide about every 145 days, or five times per lifetime. d-HSCs harbor the vast majority of multilineage long-term self-renewal activity. While they form a silent reservoir of the most potent HSCs during homeostasis, they are efficiently activated to self-renew in response to bone marrow injury or G-CSF stimulation. After re-establishment of homeostasis, activated HSCs return to dormancy, suggesting that HSCs are not stochastically entering the cell cycle but reversibly switch from dormancy to self-renewal under conditions of hematopoietic stress
2009-05-15 | GSE16100 | GEO
Project description:Exit from HSC dormancy is controlled via vitamin A/retinoic acid
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Project description:Quiescence is a fundamental property that protects hematopoietic stem cells’ (HSCs) function throughout life. A subpopulation of deeply quiescent, so-called dormant HSCs (dHSCs) harbors the highest long-term blood repopulation capacity and resides at the top of the hematopoietic hierarchy. However, the mechanisms of HSC dormancy remain elusive, mainly due to the absence of surface markers for dHSCs’ prompt isolation. We identified CD38 nicotinamide adenine dinucleotide (NAD+) catabolic ecto-enzyme as a novel surface marker for murine dHSCs. The product of CD38 cyclase activity – cyclic adenosine diphosphate ribose (cADPR), regulates the expression of the transcription factor and cell cycle regulator c-Fos via an increase of cytoplasmic Ca2+ concentration. Strikingly, we uncovered that c-Fos drives HSCs quiescence through the induction of the cell cycle inhibitor p57Kip2 expression. Moreover, we found a similar CD38-dependent mechanism of quiescence regulation for human HSCs, which are CD38 negative. Specifically, we found that CD38 ecto-enzymatic activity at the neighboring CD38-positive cells promote human HSCs’ dormancy. Together, our work reveals how extracellular metabolic cues trigger a signaling cascade blocking HSC cell cycle entrance. Pharmacological manipulations of defined pathway will provide new strategies to modulate HSCs activation upon infections, blood loss or transplantation in clinical practice.
2022-02-18 | GSE196759 | GEO
Project description:This study investigated changes in the transcriptome of outdoor grown leafy spurge crown buds as they progress from paradormancy in August and September into endo dormancy in October through to ecodormancy in November and December. Keywords: Dormancy leafy spurge adventitious-buds
2007-08-24 | GSE8849 | GEO
Project description:In order to sustain proficient life-long hematopoiesis, hematopoietic stem cells (HSCs) must possess robust mechanisms to preserve their quiescence and genome integrity. DNA-damaging stress can perturb HSC homeostasis by affecting their survival, self-renewal and differentiation. Ablation of the kinase ATM, a master regulator of the DNA damage response, impairs HSC fitness. Paradoxically, we show here that loss of a single allele of Atm enhances HSC functionality in mice. To explain this observation, we explored a possible link between ATM and the tumor suppressor PTEN, which also regulates HSC function. We generated and analyzed a knock-in mouse line (PtenS398A/S398A), in which PTEN cannot be phosphorylated by ATM. Similar to Atm+/-, PtenS398A/S398A HSCs have enhanced hematopoietic reconstitution ability, accompanied by resistance to apoptosis induced by genotoxic stress. Single-cell transcriptomic analyses and functional assays revealed that dormant PtenS398A/S398A HSCs aberrantly tolerate elevated mitochondrial activity and the accumulation of reactive oxygen species, which are normally associated with HSC priming for self-renewal or differentiation. Our results unveil a molecular connection between ATM and PTEN, which couples the response to genotoxic stress and dormancy in HSC.
2021-01-11 | GSE164388 | GEO
Project description:Correlation analysis of the expression of bud dormancy-related genes in 10 peach cultivars, with different chilling requirements for dormancy release.
2012-01-15 | E-MEXP-3201 | biostudies-arrayexpress
Project description:Quiescence is a fundamental property that protects hematopoietic stem cells’ (HSCs) function throughout life. A subpopulation of deeply quiescent, so-called dormant HSCs (dHSCs) harbors the highest long-term blood repopulation capacity and resides at the top of the hematopoietic hierarchy. However, the mechanisms of HSC dormancy remain elusive, mainly due to the absence of surface markers for dHSCs’ prompt isolation. We identified CD38 nicotinamide adenine dinucleotide (NAD+) catabolic ecto-enzyme as a novel surface marker for murine dHSCs. The product of CD38 cyclase activity – cyclic adenosine diphosphate ribose (cADPR), regulates the expression of the transcription factor and cell cycle regulator c-Fos via an increase of cytoplasmic Ca2+ concentration. Strikingly, we uncovered that c-Fos drives HSCs quiescence through the induction of the cell cycle inhibitor p57Kip2 expression. Moreover, we found a similar CD38-dependent mechanism of quiescence regulation for human HSCs, which are CD38 negative. Specifically, we found that CD38 ecto-enzymatic activity at the neighboring CD38-positive cells promote human HSCs’ dormancy. Together, our work reveals how extracellular metabolic cues trigger a signaling cascade blocking HSC cell cycle entrance. Pharmacological manipulations of defined pathway will provide new strategies to modulate HSCs activation upon infections, blood loss or transplantation in clinical practice.
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2013-08-01 | E-GEOD-44165 | biostudies-arrayexpress