Details for: CL0002057

Cell ID: CL0002057

Cell Name: CD14-positive, CD16-negative classical monocyte

Description: This cell type is compatible with the HIPC Lyoplate markers for 'CD16- monocyte'. The markers used in the definition are associated with human monocytes.

Synonyms: CD16-negative monocyte, CD16- monocyte

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for CD14-positive, CD16-negative classical monocyte 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 CD14-positive, CD16-negative classical monocyte. 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 CD14-positive, CD16-negative classical monocyte. 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 CD14-positive, CD16-negative classical monocyte. 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:  CD14-positive, CD16-negative classical monocyte (CL0002057)

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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 [CD14-positive, CD16-negative classical monocyte](/details-cell/CL0002057) is a key component of the myeloid lineage of the innate immune system. Based on its gene significance profile, this cell is characterized by an exceptionally high and specific expression of genes involved in iron homeostasis, such as [FTL](/details-gene/2512) and [FTH1](/details-gene/2495). This suggests a fundamental role in managing iron metabolism, likely at the interface of host defense and inflammation. Beyond this defining feature, the cell exhibits a strong signature of high metabolic activity, robust protein synthesis and turnover, and essential machinery for antigen presentation, consistent with its function as a professional phagocyte and a precursor to tissue macrophages. ## Key Characteristics and Function Analysis of top marker genes, identified by their high expression specificity (`csi_z`), reveals several core functional clusters that define the [CD14-positive, CD16-negative classical monocyte](/details-cell/CL0002057). * **Iron Sequestration and Metabolism:** The most specific markers for this cell type are the ferritin light and heavy chain genes, [FTL](/details-gene/2512) and [FTH1](/details-gene/2495). Ferritin is the primary intracellular iron-storage protein, and its high expression underscores the cell's central role in iron trafficking and sequestration. This function is critical for innate immunity, both by limiting iron availability to invading pathogens and by mitigating iron-induced oxidative stress during inflammation. * **Antigen Processing and Presentation:** The high significance of [B2M](/details-gene/567) (Beta-2-microglobulin), a component of MHC class I molecules, and [HLA E](/details-gene/3133), a non-classical MHC class Ib molecule, points to the cell's capacity for antigen presentation. This is consistent with its role in initiating adaptive immune responses by presenting antigens to T lymphocytes. * **High Metabolic Activity:** A prominent feature of this monocyte is the high expression of multiple mitochondrial genes, including [ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), and [ATP5MG](/details-gene/10632). These genes encode core components of the electron transport chain, indicating a high energy demand required to fuel processes like phagocytosis, migration, and cytokine production. * **Post-Transcriptional and Translational Regulation:** The cell exhibits a complex regulatory network highlighted by the specific expression of RNA-binding proteins and helicases like [DDX5](/details-gene/1655), [HNRNPA2B1](/details-gene/3181), and [ZFP36](/details-gene/7538), as well as the long non-coding RNA [NEAT1](/details-gene/283131). [ZFP36](/details-gene/7538), in particular, is a key regulator that destabilizes pro-inflammatory mRNAs, suggesting a built-in mechanism for resolving inflammation. This indicates that the cell's functions are tightly controlled at the post-transcriptional level. * **Cytoskeletal Dynamics and Motility:** Genes encoding cytoskeletal components, such as [MYL6](/details-gene/4637), [MYL12A](/details-gene/10627), and [CFL1](/details-gene/1072), are highly significant. This reflects the cell's motile nature, which is essential for its migration from the bloodstream into tissues in response to inflammatory signals. **Overall**, the anti-marker profile helps to further refine the cell's identity. The low significance score for genes like [CX3CR1](/details-gene/1524), a marker for non-classical monocytes, confirms the classical phenotype. Similarly, low scores for potent inflammatory regulators like [IL1RN](/details-gene/3557) and inflammasome components such as [NLRP12](/details-gene/91662) suggest that while poised for response, these cells do not maintain a constitutively high expression of certain anti-inflammatory or specific inflammasome pathways. ## Clinical Significance and Contextual Roles As the data is presented in an **Overall** context, the clinical significance is inferred from the general functions of the top marker genes. [CD14-positive, CD16-negative classical monocytes](/details-cell/CL0002057) are known to be key players in numerous inflammatory diseases, infections, and cancer. The pronounced iron-handling signature, defined by [FTL](/details-gene/2512) and [FTH1](/details-gene/2495), is clinically relevant in the context of "inflammation-associated anemia" or "anemia of chronic disease," where myeloid cells sequester iron, making it unavailable for erythropoiesis. Dysregulation of iron metabolism in these cells can impact susceptibility to infections, as iron is a critical nutrient for many pathogens. The high expression of [HMGB1](/details-gene/3146), a potent damage-associated molecular pattern (DAMP), suggests that upon activation or necrotic cell death, these monocytes can release signals that amplify inflammation. [HMGB1](/details-gene/3146) is implicated in the pathogenesis of sepsis, arthritis, and atherosclerosis. Furthermore, the significance of the transcriptional regulator [KLF6](/details-gene/1316), which has roles in both tumor suppression and fibrosis, may indicate the involvement of these cells in tissue remodeling and cancer biology. The expression of antiproliferative genes like [BTG1](/details-gene/694) could be a mechanism to control monocyte expansion and differentiation. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Classical monocytes function as central hubs for systemic iron homeostasis, actively modulating innate immune responses through the control of iron availability.** The exceptional specificity of ferritin gene expression ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) suggests this is not a passive housekeeping function but a primary, regulated specialization. By sequestering iron, these cells may directly starve pathogens and fine-tune the inflammatory potential of the microenvironment by controlling iron-catalyzed reactive oxygen species production. * **Surprising Findings:** It is notable that core metabolic components like ferritin and mitochondrial proteins exhibit the highest expression specificity ([csi_z]), surpassing many canonical immune-specific surface markers. This implies that the metabolic state, particularly iron management, is a more defining feature of this cell's identity than its surface phenotype alone. * **Testable Questions:** How does targeted depletion of [FTH1](/details-gene/2495) in human monocytes affect their ability to restrict the growth of intracellular bacteria like *Salmonella typhimurium*? Does iron-loading of these cells prior to LPS stimulation alter their cytokine secretion profile, and is this effect dependent on ferritin expression? 2. **Hypothesis: The functional plasticity of classical monocytes is governed by a robust network of post-transcriptional regulators that rapidly shape the inflammatory proteome.** The high significance of multiple RNA-binding proteins ([ZFP36](/details-gene/7538), [HNRNPA2B1](/details-gene/3181), [DDX5](/details-gene/1655)) and the nuclear lncRNA [NEAT1](/details-gene/283131) points to a critical layer of control downstream of transcription. This network likely allows the monocyte to mount a swift but tightly controlled inflammatory response by modulating the stability and translation of key immune-related mRNAs. * **Surprising Findings:** The high specificity of [NEAT1](/details-gene/283131), a structural component of nuclear paraspeckles, is unexpected for a circulating immune cell. This suggests that paraspeckle-mediated nuclear retention of RNA transcripts may be a highly specific and important mechanism for regulating gene expression programs in classical monocytes, potentially by sequestering transcription factors or specific mRNAs until an activation signal is received. * **Testable Questions:** Does knockdown of [ZFP36](/details-gene/7538) in [CD14-positive, CD16-negative classical monocytes](/details-cell/CL0002057) lead to a hyper-inflammatory phenotype characterized by prolonged expression of TNF-alpha and IL-6 mRNA following TLR4 activation? Furthermore, does disrupting [NEAT1](/details-gene/283131) expression alter the subcellular localization or splicing patterns of key immune transcription factors or cytokine transcripts in these cells?