Details for: CL0000034

Cell ID: CL0000034

Cell Name: stem cell

Description: A relatively undifferentiated cell that retains the ability to divide and proliferate throughout life to provide progenitor cells that can differentiate into specialized cells.

Synonyms: animal stem cell

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 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 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 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 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:  stem cell (CL0000034)

 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 [stem cell](/details-cell/CL0000034) is a relatively undifferentiated cell characterized by its dual capacity for self-renewal and differentiation into specialized cell types. The gene significance profile for this cell, based on expression specificity (**Overall**), reveals a profound and defining reliance on high-efficiency energy production. The top markers are overwhelmingly components of mitochondrial aerobic respiration, including subunits of cytochrome c oxidase ([COX4I1](/details-gene/1327), [COX6C](/details-gene/1345)) and ATP synthase ([ATP5MC2](/details-gene/517)). This suggests that a state of high metabolic activity, specifically oxidative phosphorylation, is a fundamental and distinguishing characteristic of the general stem cell identity. ## Key Characteristics and Function The defining features of a [stem cell](/details-cell/CL0000034) can be understood through several key functional clusters of highly specific genes. * **Mitochondrial Energy Metabolism:** The most prominent characteristic is an exceptional reliance on oxidative phosphorylation. A large number of the top-ranked genes are essential components of the mitochondrial electron transport chain and ATP synthesis. These include multiple subunits of Complex IV (cytochrome c oxidase), such as [COX4I1](/details-gene/1327), [COX6C](/details-gene/1345), [COX7C](/details-gene/1350), [COX5B](/details-gene/1329), [COX6A1](/details-gene/1337), and [COX7A2](/details-gene/1347), as well as Complex I ([NDUFA4](/details-gene/4697)) and Complex V (ATP synthase) ([ATP5MC2](/details-gene/517), [ATP5PF](/details-gene/522), [ATP5MG](/details-gene/10632), [ATP5F1B](/details-gene/506)). The high specificity of these genes suggests that maintaining a high rate of aerobic respiration is crucial for the energy-intensive processes of self-renewal and proliferation. The significance of the glycolytic enzyme [GAPDH](/details-gene/2597) further points to a high overall metabolic flux. * **Iron Homeostasis:** Tightly linked to metabolic activity, iron management is another key feature, highlighted by the high significance of both the light ([FTL](/details-gene/2512)) and heavy ([FTH1](/details-gene/2495)) chains of ferritin. Ferritin is critical for sequestering intracellular iron, preventing oxidative stress and providing the necessary iron cofactors for mitochondrial cytochromes and other enzymes. This indicates that robust control of iron metabolism is integral to supporting the cell's high respiratory rate. * **Protein Synthesis and Processing:** The data indicate that [stem cells](/details-cell/CL0000034) are primed for active protein production. The significance of nucleophosmin ([NPM1](/details-gene/4869)), involved in ribosome biogenesis, the poly(A)-binding protein [PABPC1](/details-gene/26986), and the eukaryotic translation elongation factor [EEF1B2](/details-gene/1933) underscores the cell's capacity for rapid and sustained protein synthesis, a prerequisite for cell division and eventual differentiation. * **Chromatin and Transcriptional Regulation:** Markers such as High Mobility Group Box 1 ([HMGB1](/details-gene/3146)) and Y-box binding protein 1 ([YBX1](/details-gene/4904)) are highly significant. These proteins are known to play roles in maintaining chromatin architecture and regulating transcription. Their prominence is consistent with the need for a plastic and accessible chromatin state that allows for the dynamic gene expression changes required for maintaining pluripotency and initiating differentiation programs. **Conversely**, the anti-markers list helps define what this cell is not. The lack of significance for genes associated with specific, differentiated cell functions, such as the placental growth factor [PGF](/details-gene/5228), the developmental signaling protein [SHH](/details-gene/6469), or the protease [CTSV](/details-gene/1515), reinforces the cell's undifferentiated and uncommitted state. ## Clinical Significance and Contextual Roles **Overall**, the gene profile points to the central role of metabolism in stem cell biology, with potential clinical implications. The heavy reliance on mitochondrial function suggests that [stem cells](/details-cell/CL0000034) may be particularly vulnerable to mitochondrial dysfunction or toxins. Conditions associated with mitochondrial defects could impair the regenerative capacity of endogenous stem cell populations. The high significance of genes like [NPM1](/details-gene/4869) and [HMGB1](/details-gene/3146) is also clinically relevant. [NPM1](/details-gene/4869) is frequently mutated in acute myeloid leukemia, highlighting a link between the disruption of fundamental stem cell machinery and oncogenesis. [HMGB1](/details-gene/3146), when released from cells, acts as a potent pro-inflammatory cytokine (a DAMP, or damage-associated molecular pattern). Its high constitutive expression in [stem cells](/details-cell/CL0000034) suggests that the integrity of these cells is critical, as their damage or death could be a significant source of inflammation in tissues. Therapeutically, this metabolic profile suggests that modulating cellular metabolism could be a strategy to control stem cell fate. For instance, promoting or inhibiting oxidative phosphorylation might be a tool to maintain stemness in culture or to drive differentiation for regenerative medicine applications. ## Potential Mechanisms and Research Directions 1. * **Hypothesis:** The fundamental identity of a [stem cell](/details-cell/CL0000034) is primarily defined by a specific, high-flux metabolic state centered on oxidative phosphorylation. This metabolic phenotype is not merely supportive but acts as a core regulatory hub required to maintain the epigenetic plasticity and energy budget for self-renewal, effectively gating the cell's ability to differentiate. * **Surprising Findings:** It is remarkable that genes for ubiquitous metabolic machinery, such as [COX4I1](/details-gene/1327) and [ATP5MC2](/details-gene/517), show greater expression specificity for the stem cell state than many canonical transcription factors associated with pluripotency. This suggests that metabolic configuration may be a more universal and defining feature of 'stemness' across different stem cell populations than the expression of a particular transcription factor network. * **Testable Questions:** If [stem cells](/details-cell/CL0000034) are metabolically shifted from oxidative phosphorylation towards glycolysis via pharmacological inhibition of the electron transport chain (e.g., targeting Complex IV), do they lose self-renewal capacity and undergo lineage-specific differentiation, and does this coincide with specific changes in histone methylation and acetylation marks? 2. * **Hypothesis:** Iron homeostasis, governed by the high expression of ferritin subunits [FTL](/details-gene/2512) and [FTH1](/details-gene/2495), functions as a critical upstream regulator of the epigenetic landscape in [stem cells](/details-cell/CL0000034). By controlling the bioavailability of iron, a key cofactor for numerous epigenetic enzymes (e.g., JmjC-domain histone demethylases and TET DNA demethylases), ferritin levels directly influence chromatin accessibility and gene expression to sustain a pluripotent state. * **Surprising Findings:** The ranking of iron metabolism genes ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) on par with core components of the mitochondrial respiratory chain is unexpected. This finding elevates iron homeostasis from a general housekeeping function to a potential master regulatory role, tightly integrated with both the metabolic and epigenetic programs defining the stem cell phenotype. * **Testable Questions:** Does targeted knockdown of [FTH1](/details-gene/2495) or [FTL](/details-gene/2512) in [stem cells](/details-cell/CL0000034) lead to specific alterations in the global landscape of H3K27me3 or 5-hydroxymethylcytosine, and does this phenocopy the effects of directly inhibiting iron-dependent epigenetic modifiers?