Details for: CL0000094

Cell ID: CL0000094

Cell Name: granulocyte

Description: A leukocyte with abundant granules in the cytoplasm.

Synonyms: granular leucocyte, granular leukocyte, polymorphonuclear leukocyte

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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 granulocyte 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 granulocyte. 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 granulocyte. 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 granulocyte. 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:  granulocyte (CL0000094)

 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 The [granulocyte](/details-cell/CL0000094), or polymorphonuclear leukocyte, is a type of white blood cell characterized by the presence of cytoplasmic granules. **Overall**, analysis of its gene expression specificity reveals a cell defined not only by its innate immune effector functions but also by a remarkably high and specific expression of genes involved in fundamental cellular processes. The top markers, including [TPT1](/details-gene/7178), [B2M](/details-gene/567), and [COX4I1](/details-gene/1327), suggest that the core identity of a [granulocyte](/details-cell/CL0000094) is intrinsically linked to a state of high metabolic readiness and robust protein synthesis, which likely supports its critical role as a rapid first responder in the immune system. ## Key Characteristics and Function The gene significance profile of the [granulocyte](/details-cell/CL0000094) is dominated by genes underpinning core cellular machinery, suggesting these processes are executed at a uniquely high level compared to other cell types. These can be grouped into several key functional clusters. * **Protein Synthesis and RNA Processing:** A striking number of top markers are integral to translation and RNA management. These include Translationally Controlled Tumor Protein ([TPT1](/details-gene/7178); CSI=65.45), Poly(A) Binding Protein Cytoplasmic 1 ([PABPC1](/details-gene/26986); CSI=52.18), and elongation factors ([EEF1D](/details-gene/1936), [EEF1B2](/details-gene/1933)). Furthermore, several heterogeneous nuclear ribonucleoproteins such as [HNRNPA2B1](/details-gene/3181), [HNRNPC](/details-gene/3183), and [HNRNPA1](/details-gene/3178) show high expression specificity. This collective signature indicates that [granulocytes](/details-cell/CL0000094) maintain a highly active translational apparatus, essential for rapidly producing proteins required for inflammation, phagocytosis, and degranulation. * **Energy Metabolism:** The cell's high metabolic activity is underscored by the prominence of genes involved in aerobic respiration. Multiple subunits of the mitochondrial respiratory chain are top markers, including Cytochrome C Oxidase Subunit IV Isoform 1 ([COX4I1](/details-gene/1327); CSI=61.38), ATP Synthase F1 Subunit Epsilon ([ATP5F1E](/details-gene/514)), and Cytochrome C Oxidase Subunit 7C ([COX7C](/details-gene/1350)). The high specificity of the ADP/ATP translocase [SLC25A6](/details-gene/293) further emphasizes a high capacity for ATP production, which is crucial for fueling energy-demanding processes like the respiratory burst and chemotaxis. * **Antigen Presentation and Immune Signaling:** The second most specific marker is Beta-2-Microglobulin ([B2M](/details-gene/567); CSI=63.81), a key component of the MHC class I molecule. This strongly suggests that [granulocytes](/details-cell/CL0000094), traditionally viewed as purely innate phagocytes, may have an underappreciated role in presenting antigens to the adaptive immune system, particularly to [T cells](/details-cell/CL0000084). * **Iron Homeostasis and Cytoskeletal Dynamics:** The high specificity of ferritin light and heavy chain genes ([FTL](/details-gene/2512) and [FTH1](/details-gene/2495)) points to a specialized role in managing iron, a critical cofactor for enzymes involved in generating reactive oxygen species. Additionally, genes like cofilin 1 ([CFL1](/details-gene/1072)) and myosin light chain 6 ([MYL6](/details-gene/4637)) highlight the importance of dynamic actin cytoskeletal remodeling for cell motility and effector functions. The anti-marker profile helps refine the cell's identity. The low specificity score ([csi_z](/methods)) for genes characteristic of other immune cells, such as the mast cell tryptase [TPSD1](/details-gene/23430) or the eosinophil major basic protein [PRG2](/details-gene/5553), reinforces that while these cells share a myeloid lineage, the [granulocyte](/details-cell/CL0000094) maintains a distinct transcriptional identity. ## Clinical Significance and Contextual Roles Although this analysis represents a general or **Overall** context, the unique genetic signature of [granulocytes](/details-cell/CL0000094) has significant clinical implications. The profound metabolic activity, indicated by markers like [COX4I1](/details-gene/1327) and [SLC25A6](/details-gene/293), positions [granulocytes](/details-cell/CL0000094) as key players in hypermetabolic states such as sepsis and chronic inflammation. Dysregulation of this metabolic machinery could lead to either impaired antimicrobial function or excessive inflammatory damage. The high specificity of ferritin genes ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) is also relevant, as iron sequestration is a critical host defense mechanism during infection, and serum ferritin is a well-known inflammatory marker. The high specificity of [B2M](/details-gene/567) is particularly noteworthy. Elevated serum B2M levels are used as a prognostic marker in several hematological malignancies. While this is often attributed to lymphoid cells, the strong signature in [granulocytes](/details-cell/CL0000094) suggests they could also contribute to circulating B2M levels or that MHC class I expression on these cells is clinically relevant in cancer immunology and inflammatory diseases. ## Potential Mechanisms and Research Directions 1. **Hypothesis: The defining feature of a granulocyte's basal state is a "primed-for-action" condition characterized by exceptionally high, specific expression of core translational and metabolic machinery.** This allows the cell to rapidly execute complex effector functions upon activation without the transcriptional delay typically required for *de novo* synthesis of these fundamental components. * **Surprising Findings:** The most specific genetic markers for [granulocytes](/details-cell/CL0000094) are not the classic granule proteins (e.g., myeloperoxidase, elastase) but are genes often categorized as "housekeeping." This suggests that the quantitative and specific upregulation of this core machinery, rather than the mere presence of effector molecules, is a more defining feature of the cell's identity in a comparative transcriptomic context. * **Testable Questions:** Does inhibiting key translation elongation factors, such as [EEF1D](/details-gene/1936), at baseline impair the speed or magnitude of a [granulocyte's](/details-cell/CL0000094) response (e.g., respiratory burst, degranulation) to inflammatory stimuli like lipopolysaccharide? 2. **Hypothesis: Granulocytes play a more direct and significant role in shaping adaptive T-cell immunity through MHC class I-mediated interactions than is currently recognized.** The high specificity of [B2M](/details-gene/567) suggests this pathway is a core, defining feature of the cell, potentially enabling them to present endogenous or cross-presented antigens to cytotoxic [T cells](/details-cell/CL0000084). * **Surprising Findings:** A central component of the MHC class I antigen presentation pathway is the second most specific marker for a cell type classically considered a hallmark of the innate immune system. This challenges the traditional division of labor between innate phagocytes and professional antigen-presenting cells. * **Testable Questions:** Using an *in vitro* co-culture system, can [granulocytes](/details-cell/CL0000094) that have phagocytosed virus-infected apoptotic bodies activate a response in antigen-specific [CD8-positive, alpha-beta T cells](/details-cell/CL0000625) in a manner that is dependent on both the granulocyte's and the T cell's MHC-I machinery?