Details for: CL1000334

Cell ID: CL1000334

Cell Name: enterocyte of epithelium of small intestine

Description: An enterocyte that is part of the epithelium of small intestine.

Selected Context(s): Overall

Gene Significance Landscape

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

Image representation

Depiction of enterocyte of epithelium of small intestine
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for enterocyte of epithelium of small intestine 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 enterocyte of epithelium of small intestine. 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 enterocyte of epithelium of small intestine. 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 enterocyte of epithelium of small intestine. 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:  enterocyte of epithelium of small intestine (CL1000334)

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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.

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## Summary The [enterocyte of epithelium of small intestine](/details-cell/CL1000334) is a highly specialized epithelial cell central to the digestion and absorption of nutrients. Based on its gene significance profile, this cell's most defining characteristic is an exceptionally high level of metabolic activity, driven by aerobic respiration. The top marker genes are overwhelmingly components of the mitochondrial electron transport chain, including [ND2](/details-gene/4536), [ATP6](/details-gene/4508), and [COX2](/details-gene/4513), whose high expression specificity (high `csi_z` scores) suggests that this massive energy-generating capacity is a primary determinant of the cell's identity and function. This metabolic machinery supports the energy-intensive processes of nutrient transport, processing, and maintaining the intestinal barrier. ## Key Characteristics and Function The functional profile of the small intestine enterocyte is dominated by processes related to energy production and cellular maintenance, consistent with its absorptive role. * **Mitochondrial Respiration and Energy Metabolism:** The most significant markers for this cell type form a comprehensive toolkit for mitochondrial function. A large number of both mitochondrial-encoded ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND4](/details-gene/4538), [ND5](/details-gene/4540), [COX2](/details-gene/4513), [ATP6](/details-gene/4508)) and nuclear-encoded ([COX4I1](/details-gene/1327), [COX5B](/details-gene/1329), [COX6A1](/details-gene/1337), [COX6C](/details-gene/1345), [UQCRB](/details-gene/7381), [ATP5F1B](/details-gene/506), [ATP5F1E](/details-gene/514), [ATP5MG](/details-gene/10632), [ATP5ME](/details-gene/521), [ATP5PF](/details-gene/522)) components of the electron transport chain and ATP synthase show exceptionally high specificity. This indicates that a primary and defining function of these cells is the generation of vast amounts of ATP through oxidative phosphorylation to fuel active transport of nutrients from the intestinal lumen. * **Ion Homeostasis and Metal Binding:** Enterocytes play a crucial role in mineral absorption. This is reflected in the high significance of genes involved in iron and calcium handling. [FTH1](/details-gene/2495) and [FTL](/details-gene/2512), which encode the heavy and light chains of ferritin, are top markers, highlighting the cell's essential role in sequestering and storing iron, a process critical for both systemic iron balance and preventing local iron-induced oxidative damage. The high rank of [CALM1](/details-gene/801), encoding calmodulin, points to the importance of calcium-dependent signaling pathways in regulating intestinal transport and cellular processes. * **Oxidative Stress Management:** The intense metabolic activity of mitochondria generates significant reactive oxygen species (ROS). The prominence of [SOD1](/details-gene/6647) (Superoxide Dismutase 1) as a key marker suggests a robust, constitutive system to neutralize superoxide radicals. This antioxidant defense is likely critical for protecting the cell from oxidative damage and maintaining the integrity of the intestinal barrier. * **Cytoskeletal Structure and Transport:** The presence of markers like [CFL1](/details-gene/1072) (Cofilin 1) and [MYL6](/details-gene/4637) (Myosin Light Chain 6) underscores the importance of a dynamic actin cytoskeleton. This network is vital for maintaining the structural integrity of the microvilli (the brush border), which vastly increases the cell's absorptive surface area, and for intracellular trafficking of absorbed nutrients. **Overall**, the anti-marker profile helps to refine the cell's specialized role. The low significance of genes associated with specific metabolic pathways like [CYP2C9](/details-gene/1559) or cell-death pathways like [GSDME](/details-gene/1687) may indicate these functions are less central to this cell's identity or are handled by other cell types within the tissue. The negative effect size for the immediate early gene [FOS](/details-gene/2353) is consistent with this cell type representing a terminally differentiated state, rather than a proliferating progenitor cell from the intestinal crypts. ## Clinical Significance and Contextual Roles Given the cell's profound reliance on mitochondrial function, its health is intrinsically linked to metabolic diseases and conditions of oxidative stress. The overwhelming signature of mitochondrial genes suggests that enterocytes could be particularly vulnerable to mitochondrial dysfunction. Genetic defects in these components, such as those in [ND1](/details-gene/4535) or [ATP6](/details-gene/4508), are causes of severe mitochondrial diseases, and while often presenting as neurological or muscular disorders, they can also manifest with gastrointestinal symptoms. This data suggests that impaired energy production in enterocytes could be a direct contributor to malabsorption and gut dysmotility in such conditions. The enterocyte's role in iron metabolism, highlighted by [FTH1](/details-gene/2495) and [FTL](/details-gene/2512), places it at the center of systemic iron homeostasis. Dysregulation of iron uptake and storage in these cells can lead to either iron-deficiency anemia or iron overload disorders like hemochromatosis. Furthermore, the interplay between high metabolic activity, iron handling, and oxidative stress is critical in inflammatory bowel disease (IBD). The high expression of [SOD1](/details-gene/6647) points to an existing defense mechanism, but overwhelming inflammation in IBD could exhaust this system, leading to barrier dysfunction and exacerbated tissue damage. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining molecular identity of a mature [enterocyte of the small intestine](/details-cell/CL1000334) is not primarily its digestive enzyme profile but its extreme and specialized commitment to mitochondrial aerobic respiration. This suggests that the cell's capacity for nutrient transport is directly rate-limited by its ATP-generating capability. * **Surprising Findings:** It is remarkable that nearly all of the top 20 most specific genes are related to mitochondrial energy production. This overshadows classic enterocyte markers (e.g., sucrase-isomaltase, peptidases), implying that from a transcriptomic specificity standpoint, the enterocyte's role as a "powerhouse" is more unique than its role as a "digestive factory" when compared to all other cell types. * **Testable Question:** Using intestinal organoid models, does the specific inhibition of mitochondrial ATP synthase with oligomycin cause a more profound and rapid reduction in the active transport of glucose (via SGLT1) and amino acids compared to inhibiting glycolysis, and is this effect significantly greater in differentiated enterocytes versus crypt-based stem cells? 2. **Hypothesis:** The co-expression of a robust iron-storage system ([FTH1](/details-gene/2495)/[FTL](/details-gene/2512)) and a primary antioxidant enzyme ([SOD1](/details-gene/6647)) represents a constitutive, tightly-coupled protective mechanism. This system is essential to buffer the cell against the high levels of ROS generated as a byproduct of its massive mitochondrial activity, thereby preventing oxidative damage and maintaining intestinal barrier integrity. * **Surprising Findings:** The data suggest that antioxidant and iron sequestration systems are not merely inducible stress responses but are maintained at high, specific levels as a core part of the cell's baseline functional state. This indicates an evolutionary adaptation to a high-risk, high-energy metabolic lifestyle. * **Testable Question:** Does siRNA-mediated knockdown of [FTH1](/details-gene/2495) in a Caco-2 enterocyte cell line lead to increased mitochondrial-derived superoxide levels (as measured by MitoSOX) and a corresponding decrease in transepithelial electrical resistance (TEER), even under physiological iron conditions, indicating that ferritin's primary role is to prevent local iron-catalyzed oxidative stress?