Details for: CL0000577

Cell ID: CL0000577

Cell Name: type EC enteroendocrine cell

Description: A subtype of enteroendocrine cells found in the gastrointestinal mucosa, particularly in the glands of pyloric antrum; duodenum; and ileum. These cell type secretes serotonin and some neurotransmitters including enkephalins and substance P. Their secretory granules stain readily with silver (argentaffin stain).

Synonyms: Kulchitsky cell, argentaffin cell, enterochromaffin cell

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

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for type EC enteroendocrine 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 type EC enteroendocrine 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 type EC enteroendocrine 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 type EC enteroendocrine 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.

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Target Cell for CSI:  type EC enteroendocrine cell (CL0000577)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 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 [type EC enteroendocrine cell](/details-cell/CL0000577), also known as an enterochromaffin cell, is a specialized neuroendocrine cell of the gastrointestinal mucosa responsible for secreting serotonin and various neurotransmitters. Based on gene significance analysis, its most defining characteristic is an exceptionally high and specific expression of genes related to mitochondrial energy production. This suggests that the cell is a metabolic powerhouse, a feature likely essential to sustain its demanding role in synthesizing and secreting signaling molecules critical for gut physiology. ## Key Characteristics and Function Analysis of gene significance in the **Overall** context reveals a transcriptional profile dominated by machinery for high-energy metabolism and protein synthesis, which underpins the cell's primary secretory function. * **Extraordinary Mitochondrial Activity:** The most specific markers for the [type EC enteroendocrine cell](/details-cell/CL0000577) are overwhelmingly components of the mitochondrial electron transport chain. Genes encoding subunits of cytochrome c oxidase, such as [COX2](/details-gene/4513) (CSI-Z: 29.50), [COX1](/details-gene/4512) (CSI-Z: 28.57), [COX4I1](/details-gene/1327), and [COX6C](/details-gene/1345), as well as components of Complex I ([ND3](/details-gene/4537), [ND4](/details-gene/4538)) and ATP synthase ([ATP5F1E](/details-gene/514), [ATP6](/details-gene/4508)), exhibit top-ranking expression specificity. This profound signature of aerobic respiration indicates an immense and constitutive demand for ATP, likely to fuel the synthesis, packaging, and exocytosis of serotonin and neuropeptides. * **High-Throughput Protein and Vesicle Dynamics:** Beyond energy production, the cell is characterized by high expression of genes essential for protein management and cellular structure. Significant markers include genes for protein turnover like [UBB](/details-gene/7314) and [UBC](/details-gene/7316), and cytoskeletal components involved in transport and motility such as [MYL6](/details-gene/4637) (myosin light chain) and [CFL1](/details-gene/1072) (cofilin). The high specificity of the key calcium sensor [CALM1](/details-gene/801) further highlights the importance of calcium-regulated pathways, which are central to neurotransmitter release. Together, these markers point to a highly active system for protein synthesis, vesicular trafficking, and regulated secretion. * **General Housekeeping as a Defining Feature:** The high specificity scores for broadly expressed genes like [GAPDH](/details-gene/2597), histone variants ([H3-3B](/details-gene/3021), [H3-3A](/details-gene/3020)), and beta-2-microglobulin ([B2M](/details-gene/567)) are notable. This suggests that the baseline cellular maintenance and operational tempo of [type EC enteroendocrine cells](/details-cell/CL0000577) are significantly elevated compared to surrounding cell types, reinforcing their identity as highly active metabolic and secretory units. The anti-marker profile is less distinct, with genes such as [CLDN15](/details-gene/24146) (a tight junction protein) and [PTPRN2](/details-gene/5799) (a receptor-type tyrosine phosphatase) showing low significance. This suggests that the unique identity of this cell is not defined by specific adhesion molecules or particular phosphatase signaling pathways, but rather by its super-specialized metabolic and secretory capacity. ## Clinical Significance and Contextual Roles The singular focus on a high-energy metabolic profile provides critical insights into the potential roles of [type EC enteroendocrine cells](/details-cell/CL0000577) in health and disease. As these cells produce the vast majority of the body's serotonin, their dysfunction is implicated in a range of gastrointestinal and systemic disorders. The profound dependence on mitochondrial function, as evidenced by the top-ranking specificity of genes like [COX1](/details-gene/4512) and [COX2](/details-gene/4513) ([Link](https://pubmed.ncbi.nlm.nih.gov/7219534/)), suggests that these cells may be particularly vulnerable to mitochondrial toxins, metabolic stress, or genetic mitochondrial diseases. A decline in their energetic capacity could lead to reduced serotonin output, potentially contributing to disorders of gut motility, such as irritable bowel syndrome (IBS). Conversely, the over-proliferation of these cells in carcinoid tumors would create a massive metabolic sink and a source of serotonin overproduction, leading to the clinical manifestations of carcinoid syndrome. The gene expression profile highlights a suite of potential biomarkers or therapeutic targets centered on mitochondrial metabolism for such conditions. Furthermore, the G-protein alpha subunit gene [GNAS](/details-gene/2778) is also a significant marker, implicating this key signaling node in the cell's function and its potential dysregulation in disease. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The extreme expression specificity (`csi_z`) of mitochondrial respiratory chain components is not merely a marker of high metabolic activity but reflects a specialized adaptation where mitochondria are functionally and perhaps physically coupled to the secretory machinery to meet the immense, localized ATP demand of neurotransmitter synthesis and exocytosis. * **Surprising Findings:** It is highly unusual for core, near-ubiquitous mitochondrial genes to emerge as the most specific markers of a cell type. This finding suggests that the regulation of mitochondrial gene expression in [type EC enteroendocrine cells](/details-cell/CL0000577) is fundamentally different from that in neighboring epithelial cells, elevating it from a "housekeeping" function to a primary pillar of cell identity. * **Testable Questions:** Does high-resolution imaging (e.g., electron microscopy or super-resolution fluorescence microscopy) of [type EC enteroendocrine cells](/details-cell/CL0000577) reveal a distinct subcellular organization, with mitochondria preferentially co-localizing with secretory granules and the Golgi apparatus compared to other intestinal epithelial cells? 2. **Hypothesis:** The high specificity of general protein turnover genes, such as [UBB](/details-gene/7314) and [UBC](/details-gene/7316), points to a critical role for the ubiquitin-proteasome system in tightly regulating the abundance of key secretory proteins or signaling receptors, thereby controlling the cell's secretory capacity and responsiveness. * **Surprising Findings:** While ubiquitination is a universal process, its prominence as a highly *specific* feature suggests a role beyond simple protein degradation. It may be involved in the rapid, regulated clearance of signaling components to terminate signals or in the quality control of the massive protein synthesis required for its secretory function. * **Testable Questions:** If ubiquitination is inhibited in primary [type EC enteroendocrine cell](/details-cell/CL0000577) cultures or organoids, does this lead to an accumulation of misfolded pro-hormones or a dysregulation in the stimulus-secretion coupling pathway, as measured by serotonin release in response to specific secretagogues?