Details for: CL0000037

Cell ID: CL0000037

Cell Name: hematopoietic stem cell

Description: Markers differ between species, and two sets of markers have been described for mice. HSCs are reportedly CD34-positive, CD45-positive, CD48-negative, CD150-positive, CD133-positive, and CD244-negative.

Synonyms: blood forming stem cell, colony forming unit hematopoietic, hemopoietic stem cell, HSC

Selected Context(s): Overall

Gene Significance Landscape

Display Options
Score:
Display
Genes

Contexts:

Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for hematopoietic stem cell within the selected context(s).

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for hematopoietic stem cell. Higher scores indicate a stronger, more significant difference in expression.
(Previously described as "Fold Change", but now represents Cliff's Delta × –log10(p).)

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for hematopoietic stem cell. Higher scores indicate a stronger, more significant difference in expression.
Average CSI: csi sum / gene count
Cell network configuration

This network visualizes key genes for hematopoietic stem cell. It primarily includes:
1. Top genes highly significant for this cell (Num. Top Cell Genes - based on the 'Min. CSI' setting).
2. Any additional specific 'Context Genes' you add below.
The final network is a combined view. Choose an Interaction Source (pathways or protein interactions) and optionally compare CSI scores with a Baseline Cell Type.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  hematopoietic stem cell (CL0000037)

 Legend
Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 N/A or Not Sig.
Edges (Interactions):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

Loading network (please wait)...

## Summary A [hematopoietic stem cell](/details-cell/CL0000037) (HSC) is a multipotent stem cell responsible for generating all mature blood and immune cells. While conventionally identified by a combination of surface markers which can differ between species, the provided `**Overall**` analysis suggests that the core identity of this cell type is also defined by a highly specific and active internal machinery. The top marker genes, identified by their unique expression specificity (`csi_z`), are overwhelmingly involved in fundamental processes such as chromatin regulation ([HMGB1](/details-gene/3146)), transcription ([BTF3](/details-gene/689)), ribosome biogenesis ([NPM1](/details-gene/4869)), and robust metabolic activity. This profile indicates that [hematopoietic stem cells](/details-cell/CL0000037) are not merely quiescent progenitors but are maintained in a state of high preparedness, characterized by active transcriptional, translational, and energetic machinery poised for rapid proliferation and differentiation. ## Key Characteristics and Function Analysis of the top marker genes reveals a profile centered around three primary functional clusters, painting a picture of a cell with high metabolic and biosynthetic demands. * **Transcriptional and Post-Transcriptional Regulation:** A prominent feature of the [hematopoietic stem cell](/details-cell/CL0000037) is the specific expression of numerous genes that control gene expression at multiple levels. [HMGB1](/details-gene/3146), a non-histone chromatin protein, suggests a role for dynamic chromatin architecture in maintaining stemness. The general transcription factor [BTF3](/details-gene/689) further underscores the importance of a poised transcriptional state. Furthermore, a suite of highly specific RNA-binding proteins, including [PABPC1](/details-gene/26986), [HNRNPA2B1](/details-gene/3181), [HNRNPA1](/details-gene/3178), and [HNRNPC](/details-gene/3183), points to extensive post-transcriptional control, likely involving mRNA stability, splicing, and localization, which are critical for regulating the translation of key proteins that govern cell fate decisions. * **High Metabolic Activity and Energy Production:** The cell exhibits a strong and specific signature of genes involved in cellular respiration and energy production. This includes multiple subunits of the mitochondrial ATP synthase and cytochrome c oxidase complexes, such as [ATP5MC2](/details-gene/517), [COX7C](/details-gene/1350), [COX4I1](/details-gene/1327), [UQCRB](/details-gene/7381), and [COX1](/details-gene/4512). The high specificity score for [GAPDH](/details-gene/2597) also highlights the importance of glycolysis. This dual signature suggests a state of high metabolic flux, necessary to fuel the biosynthetic processes required for self-renewal and the eventual generation of the entire hematopoietic system. * **Protein Synthesis and Maintenance:** Consistent with its high metabolic activity, the [hematopoietic stem cell](/details-cell/CL0000037) shows specific expression of genes essential for protein synthesis and quality control. This includes translational elongation factors like [EEF1D](/details-gene/1936) and [EEF1B2](/details-gene/1933), as well as [UBB](/details-gene/7314), which encodes polyubiquitin, a key component of the protein degradation pathway. Genes like [NPM1](/details-gene/4869) and [NCL](/details-gene/4691) are crucial for ribosome biogenesis, further emphasizing the cell's capacity for robust protein production. **Conversely**, the anti-marker profile helps refine the cell's identity. The low significance of [STAG3](/details-gene/10734), a gene critical for meiotic chromosome pairing ([Link](https://doi.org/10.1096/fasebj.14.3.581)), clearly distinguishes these somatic stem cells from germline lineages. The low specificity score for [HOXB4](/details-gene/3214), a transcription factor known to regulate hematopoietic expansion ([Link](https://doi.org/10.1084/jem.192.10.1479)), suggests that while it may play a role, its expression is not a uniquely defining characteristic of the core stem cell state compared to other cells in this context. ## Clinical Significance and Contextual Roles The gene signature of [hematopoietic stem cells](/details-cell/CL0000037) provides significant insight into hematopoietic health and disease, particularly in hematological malignancies. The high specificity of nucleophosmin ([NPM1](/details-gene/4869)) is of major clinical relevance. [NPM1](/details-gene/4869) is one of the most frequently mutated genes in acute myeloid leukemia (AML), and its cytoplasmic dislocation is a hallmark of the disease. Its foundational role in ribosome biogenesis and chromatin regulation in normal HSCs suggests that its dysregulation strikes at the very core of the cell's identity, leading to uncontrolled proliferation and a block in differentiation. Similarly, [HMGB1](/details-gene/3146) is a key alarmin, or damage-associated molecular pattern (DAMP), that can be released by stressed or dying cells to signal inflammation. Its specific expression within HSCs suggests it may play an intrinsic role in the HSC niche, potentially mediating responses to tissue damage or infection that require mobilization and activation of the stem cell pool. Its role has also been investigated in various cancers ([Link](https://doi.org/10.1002/(sici)1097-0215(19970220)74:1%3C1::aid-ijc1%3E3.0.co;2-6)). The overarching theme of high metabolic and biosynthetic activity underscores the vulnerability of the hematopoietic system to cytotoxic insults, such as chemotherapy, which preferentially target rapidly dividing and metabolically active cells. Understanding the specific metabolic dependencies of HSCs could therefore pave the way for novel strategies to protect the stem cell pool during cancer treatment or to selectively target leukemic stem cells. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining signature of a [hematopoietic stem cell](/details-cell/CL0000037) is not solely determined by lineage-specific transcription factors but is strongly enforced by a specific, high-flux metabolic state. This state, characterized by the co-expression of key glycolytic and oxidative phosphorylation machinery ([GAPDH](/details-gene/2597), [COX1](/details-gene/4512), [ATP5MC2](/details-gene/517)), maintains the cell in a state of 'poised metabolism', enabling rapid energetic adaptation required for the switch from quiescence to proliferation and differentiation. * **Surprising Findings:** Classical stem cell biology often associates quiescence with low metabolic activity, primarily reliant on glycolysis. The high specificity (`csi_z`) of numerous mitochondrial electron transport chain components in this analysis is unexpected and suggests that oxidative phosphorylation is a more integral and unique feature of the HSC identity than previously thought. * **Testable Questions:** How does targeted inhibition of key mitochondrial components, such as [COX4I1](/details-gene/1327), affect the long-term repopulation capacity and lineage fate decisions of [hematopoietic stem cells](/details-cell/CL0000037) in serial transplantation models? 2. **Hypothesis:** The identity and pluripotency of [hematopoietic stem cells](/details-cell/CL0000037) are actively maintained by a robust network of RNA-binding proteins ([HNRNPA1](/details-gene/3178), [PABPC1](/details-gene/26986)) and chromatin-modifying proteins ([HMGB1](/details-gene/3146), [NPM1](/details-gene/4869)) that function as master regulators of the stem cell transcriptome and proteome. This post-transcriptional and epigenetic layer of control acts as a critical buffer, preventing stochastic differentiation while keeping the cell primed to respond to specific lineage-inducing signals. * **Surprising Findings:** While hematopoietic transcription factors are well-studied, this analysis highlights that generalist factors involved in RNA processing and chromatin structure are the most uniquely expressed genes. This suggests that the *mechanism of gene expression regulation itself*, rather than the expression of a few specific downstream targets, is the more fundamental characteristic of the HSC state. * **Testable Questions:** What are the global changes in mRNA splicing, stability, and translation efficiency in [hematopoietic stem cells](/details-cell/CL0000037) following the conditional knockout of [HNRNPA1](/details-gene/3178), and how do these changes correlate with a loss of self-renewal or a bias towards a specific hematopoietic lineage?