Details for: CL0000169

Cell ID: CL0000169

Cell Name: type B pancreatic cell

Description: Pancreatic beta cells are also reportedly CD284-positive. Upon activation, they upregulate their CD14 expression.

Synonyms: pancreatic B cell, B-cell of pancreatic islet, beta cell islet, beta cell of pancreatic islet, beta cell, insulin-secreting cell, pancreatic B-cell, pancreatic beta cell, pancreatic islet core, type B enteroendocrine cell

Selected Context(s): Overall

Gene Significance Landscape

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Genes

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

Image representation

Depiction of type B pancreatic cell
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for type B pancreatic 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 B pancreatic 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 B pancreatic 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 B pancreatic 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:  type B pancreatic cell (CL0000169)

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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 [type B pancreatic cell](/details-cell/CL0000169), commonly known as the pancreatic beta cell, is a highly specialized endocrine cell responsible for synthesizing and secreting insulin, a critical hormone for regulating glucose homeostasis. The gene significance profile for this cell type is overwhelmingly dominated by a signature of intense metabolic activity. The highest-scoring markers are components of G-protein signaling, such as [GNAS](/details-gene/2778), and a vast suite of genes involved in mitochondrial oxidative phosphorylation, including [COX2](/details-gene/4513) and [COX1](/details-gene/4512). This molecular fingerprint underscores the cell's primary function: to sense circulating glucose levels and mount a robust, energy-intensive secretory response. The specificity of these metabolic and signaling genes suggests that the beta cell's identity is defined not just by the production of insulin, but by the exceptional bioenergetic machinery required to regulate its release. ## Key Characteristics and Function Analysis of the top gene markers reveals a cell exquisitely adapted for stimulus-secretion coupling, underpinned by an immense capacity for energy production and cellular maintenance. The key functions can be grouped into several core biological themes. * **Intense Bioenergetic Activity:** The most striking feature is the high specificity score for numerous genes encoding subunits of the mitochondrial electron transport chain and ATP synthase. These include multiple cytochrome c oxidase subunits ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX7A2](/details-gene/1347), [COX6C](/details-gene/1345)), NADH dehydrogenase subunits ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND4](/details-gene/4538)), and components of ATP synthase ([ATP6](/details-gene/4508), [ATP5F1E](/details-gene/514)). This profile is consistent with the massive ATP requirement for insulin synthesis, processing in the endoplasmic reticulum and Golgi, and ATP-dependent potassium channel closure that initiates membrane depolarization and insulin vesicle exocytosis. The high **Overall** `csi_z` scores indicate this metabolic infrastructure is a uniquely defining characteristic of the beta cell. * **Precise Stimulus-Secretion Coupling:** The top marker, [GNAS](/details-gene/2778), encodes the G-protein alpha-s subunit, a key mediator of adenylyl cyclase activation and cAMP signaling. This highlights the importance of incretin hormones (like GLP-1) in amplifying glucose-stimulated insulin secretion. Furthermore, the high significance of calmodulin genes ([CALM1](/details-gene/801), [CALM2](/details-gene/805)) and [SARAF](/details-gene/51669), a regulator of store-operated calcium entry, points to the central role of tightly regulated calcium signaling as the primary trigger for the fusion of insulin-containing granules with the plasma membrane. * **Robust Cellular Homeostasis and Stress Management:** Pancreatic beta cells exhibit high expression of genes involved in managing metabolic byproducts and cellular stress. The high specificity of ferritin heavy and light chains ([FTH1](/details-gene/2495) and [FTL](/details-gene/2512)) suggests a critical role for iron sequestration, likely to buffer against iron-catalyzed oxidative stress. This is complemented by the high score for superoxide dismutase ([SOD1](/details-gene/6647)), an essential antioxidant enzyme. This signature indicates a pre-emptive defense system against the reactive oxygen species generated by the cell's high rate of oxidative phosphorylation. The profile of anti-markers helps to distinguish the beta cell's endocrine function from the exocrine pancreas. The very low significance scores for digestive enzymes like trypsinogen ([PRSS1](/details-gene/5644)) and carboxyl ester lipase ([CEL](/details-gene/1056)) confirm the cell's distinct lineage from neighboring acinar cells. Curiously, the glucose transporter [SLC2A2](/details-gene/6514) (GLUT2), classically considered a key beta-cell protein, displays a low CSI score. This may suggest that while its function is essential, its expression is not as uniquely restricted to beta cells as the mitochondrial and signaling machinery when compared across a wide cellular landscape. ## Clinical Significance and Contextual Roles The primary clinical relevance of the [type B pancreatic cell](/details-cell/CL0000169) relates to its central role in the pathogenesis of diabetes mellitus. Dysfunction or destruction of these cells leads to insufficient insulin production, resulting in hyperglycemia. The cell's defining gene signature provides molecular insights into its vulnerabilities. The profound reliance on oxidative phosphorylation makes beta cells susceptible to metabolic stress (glucotoxicity and lipotoxicity), which can induce mitochondrial dysfunction and increase the production of damaging reactive oxygen species. The high significance of protective genes like [SOD1](/details-gene/6647) and ferritins ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)) underscores this inherent risk. Notably, [ITM2B](/details-gene/9445) is a highly specific marker. This gene is implicated in familial dementias through its role in amyloid precursor processing ([Link](https://doi.org/10.1038/21637)). Its prominence in beta cells is particularly intriguing because the deposition of islet amyloid polypeptide (IAPP or amylin) is a pathological hallmark of type 2 diabetes and contributes to beta-cell death. This suggests a potential shared mechanism of protein misfolding and aggregation between neurodegenerative diseases and type 2 diabetes, with [ITM2B](/details-gene/9445) as a possible key player in the beta cell. In the context of type 1 diabetes, an autoimmune disease, the negative CSI score for the non-classical MHC molecule [HLA E](/details-gene/3133) may be significant. Reduced [HLA E](/details-gene/3133) expression on the cell surface could diminish inhibitory signals to NK cells via their CD94/NKG2A receptors, potentially lowering the threshold for immune-mediated destruction of beta cells. ## Potential Mechanisms and Research Directions 1. * **Hypothesis:** The highly specific expression of iron-management proteins ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)) and the antioxidant enzyme [SOD1](/details-gene/6647) represents a coordinated, defining feature of the beta-cell's defense against the extreme oxidative stress generated by glucose-stimulated insulin production. We propose that the failure of this integrated iron-ROS (Reactive Oxygen Species) homeostatic network is a critical and early event in the progression of beta-cell dysfunction in type 2 diabetes. * **Surprising Findings:** The significance scores for iron homeostasis genes ([FTH1](/details-gene/2495)) are comparable to those for core components of the electron transport chain ([COX1](/details-gene/4512)). This suggests that managing iron is not merely a supportive housekeeping function but a specialized, central aspect of the beta-cell's identity and survival strategy. * **Testable Questions:** Does conditional knockout of [FTH1](/details-gene/2495) in the beta cells of a mouse model of diet-induced obesity accelerate the onset of hyperglycemia and increase markers of oxidative damage and apoptosis within the islets? 2. * **Hypothesis:** The top-ranking marker [ITM2B](/details-gene/9445), a gene linked to amyloidogenesis in the brain, plays a direct, cell-specific role in modulating the processing and aggregation of Islet Amyloid Polypeptide (IAPP) in pancreatic beta cells. Its specific expression may be a key determinant of an individual's susceptibility to forming the toxic IAPP oligomers that drive beta-cell death in type 2 diabetes. * **Surprising Findings:** A gene primarily associated with rare familial dementias ([Link](https://doi.org/10.1038/21637)) is identified as a defining marker of an endocrine cell type. This unexpected link suggests a conserved molecular pathway for pathogenic protein aggregation in both neuronal and pancreatic beta-cell contexts. * **Testable Questions:** In a cellular model co-expressing human IAPP and [ITM2B](/details-gene/9445), does siRNA-mediated knockdown of [ITM2B](/details-gene/9445) alter the secretion ratio of pro-IAPP to mature IAPP and reduce the formation of intracellular and extracellular IAPP aggregates?