Details for: CL1000347

Cell ID: CL1000347

Cell Name: colonocyte

Description: An enterocyte (absorptive epithelial cell) of the colonic epithelium, characterized by a columnar shape. This cell is responsible for the absorption, transport, and metabolization of short-chain fatty acids (SCFAs) produced by gut bacteria, as well as the transport and absorption of water and electrolytes.

Synonyms: enterocyte of colon, vacuolar absorptive cell of epithelium of colon

Selected Context(s): Overall

Gene Significance Landscape

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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 colonocyte 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 colonocyte. 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 colonocyte. 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 colonocyte. 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:  colonocyte (CL1000347)

 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.

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## Summary A [colonocyte](/details-cell/CL1000347) is a columnar absorptive epithelial cell lining the colon, responsible for the transport of water, electrolytes, and the metabolism of short-chain fatty acids. Based on gene significance analysis, its most defining characteristic is an exceptionally high level of expression of genes encoding components of the mitochondrial electron transport chain. This suggests that the cell's identity and primary functions are fundamentally dependent on a massive capacity for aerobic respiration, likely to fuel the energetically demanding processes of active transport across the colonic epithelium. ## Key Characteristics and Function **Overall**, the gene expression profile of a [colonocyte](/details-cell/CL1000347) is overwhelmingly dominated by genes essential for cellular energy production through oxidative phosphorylation. * **Mitochondrial Respiration and Energy Production:** The top markers are almost exclusively components of the mitochondrial respiratory chain. This includes multiple subunits of Complex IV (cytochrome c oxidase), such as [COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX5B](/details-gene/1329), [COX4I1](/details-gene/1327), [COX6A1](/details-gene/1337), [COX6C](/details-gene/1345), and [COX7C](/details-gene/1350). Similarly, core subunits of Complex I (NADH dehydrogenase) like [ND1](/details-gene/4535), [ND4](/details-gene/4538), [ND3](/details-gene/4537), [ND2](/details-gene/4536), and [ND5](/details-gene/4540), as well as Complex III ([CYTB](/details-gene/4519)) and Complex V ([ATP6](/details-gene/4508), [ATP5ME](/details-gene/521)), demonstrate extremely high significance scores. The high significance of [GAPDH](/details-gene/2597) is also consistent with this, as it is a key enzyme in glycolysis which provides the substrate for aerobic respiration. This molecular signature strongly indicates that the central function of [colonocytes](/details-cell/CL1000347) is powered by a high rate of ATP synthesis. * **Iron Homeostasis:** The high significance of ferritin heavy and light chain genes, [FTH1](/details-gene/2495) and [FTL](/details-gene/2512), suggests a crucial role for iron management. Iron is a vital cofactor for the heme groups within the cytochrome proteins of the electron transport chain. The high expression of ferritin is likely required to safely store and supply iron to support the massive biogenesis of these respiratory complexes, preventing iron-induced oxidative stress. * **Cytoskeletal and Ion Binding Roles:** The presence of genes like [CFL1](/details-gene/1072) (Cofilin 1) and [MYL12B](/details-gene/103910) points to active cytoskeletal dynamics, necessary for maintaining the cell's columnar shape and transport functions. The significance of [CALM1](/details-gene/801) (Calmodulin 1), a key calcium-binding protein, suggests that calcium signaling plays an important role in regulating these cellular processes. The anti-marker profile helps to define the [colonocyte](/details-cell/CL1000347) by what it is not. The low significance of genes associated with specific immune signaling pathways ([RIPK3](/details-gene/11035)), specialized metabolic functions found in other tissues like the liver ([CYP4F2](/details-gene/8529), [CYP2C9](/details-gene/1559)), and specific amino acid transport ([SLC7A9](/details-gene/11136)) confirms its distinct identity as an absorptive epithelial cell rather than an immune cell or a hepatocyte. ## Clinical Significance and Contextual Roles The profound reliance on mitochondrial function underscores the vulnerability of [colonocytes](/details-cell/CL1000347) to metabolic insults. The energy generated is critical for maintaining the intestinal barrier by powering ion pumps that drive water absorption. Dysfunction in this core machinery could lead to impaired barrier function, a hallmark of inflammatory bowel diseases. While many of the top marker genes are fundamental "housekeeping" genes, their exceptionally high and specific expression in [colonocytes](/details-cell/CL1000347) makes them central to the tissue's health. For example, publications note that mutations in mitochondrial genes such as [CYTB](/details-gene/4519) can lead to severe systemic diseases like cardiomyopathy ([Link](https://doi.org/10.1007/bf00711378)), highlighting the critical nature of these pathways. Furthermore, one study has noted that the differentiation of the HT-29 human colonic adenocarcinoma cell line is correlated with increased expression of mitochondrial RNA, including for the gene [ND4](/details-gene/4538) ([Link](https://pubmed.ncbi.nlm.nih.gov/1377597/)), suggesting a link between mitochondrial activity and the mature, functional state of [colonocytes](/details-cell/CL1000347). ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining transcriptomic feature of a mature [colonocyte](/details-cell/CL1000347) is its massive investment in the machinery for oxidative phosphorylation, which serves as the primary engine to fuel the high-energy demands of transepithelial water and electrolyte transport. * **Surprising Findings:** It is striking that genes for specific transporters (e.g., for sodium, chloride, or SCFAs) are not among the top markers. Instead, the entire top-tier of significant genes is dedicated to the power supply. This suggests that the *capacity* for energy production is a more unique and specific identifier of this cell type at the transcriptional level than the transporters themselves, which may be more broadly expressed. * **Testable Questions:** Does pharmacologic inhibition of Complex I ([ND1](/details-gene/4535), [ND4](/details-gene/4538)) or Complex IV ([COX1](/details-gene/4512), [COX2](/details-gene/4513)) in colonic organoids lead to a rapid and quantifiable collapse of the transepithelial electrical resistance and a cessation of net water absorption? 2. **Hypothesis:** The high expression of ferritin genes [FTH1](/details-gene/2495) and [FTL](/details-gene/2512) reflects a specialized cellular program to buffer and manage intracellular iron, which is essential to meet the high demand for heme synthesis required by the abundant cytochrome proteins while simultaneously preventing iron-catalyzed oxidative damage. * **Surprising Findings:** While iron storage genes are highly significant, key iron import genes are absent from the top markers list. This could imply that the rate-limiting or most highly regulated step in this context is not iron uptake from the lumen, but its intracellular handling and safe allocation to the mitochondria. * **Testable Questions:** In a Caco-2 cell model differentiated into a [colonocyte](/details-cell/CL1000347)-like phenotype, does siRNA-mediated knockdown of [FTH1](/details-gene/2495) result in decreased activity of cytochrome c oxidase and a concomitant increase in lipid peroxidation and other markers of reactive oxygen species?