Details for: CL0002396

Cell ID: CL0002396

Cell Name: CD14-low, CD16-positive monocyte

Description: Markers are associated with human monocytes.

Synonyms: non-classical monocyte, human

Selected Context(s): Overall

Gene Significance Landscape

Display Options
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 CD14-low, CD16-positive 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-low, CD16-positive 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-low, CD16-positive 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-low, CD16-positive 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-low, CD16-positive monocyte (CL0002396)

 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.

Loading network (please wait)...

## Summary The [CD14-low, CD16-positive monocyte](/details-cell/CL0002396), also known as a non-classical monocyte, is a subset of human monocytes characterized by a unique transcriptional profile suggesting specialized roles in metabolic regulation, immune surveillance, and post-transcriptional gene control. The high significance of genes involved in polyamine catabolism ([SAT1](/details-gene/6303)), RNA processing ([DDX5](/details-gene/1655)), and immune modulation via non-classical antigen presentation ([HLA-E](/details-gene/3133)) defines this cell type. **Overall**, this signature points to a cell with high metabolic activity and sophisticated regulatory functions, consistent with its known role in patrolling the endothelium and responding to inflammatory cues. ## Key Characteristics and Function The functional identity of the [CD14-low, CD16-positive monocyte](/details-cell/CL0002396) is defined by several distinct clusters of highly significant marker genes. * **RNA Processing and Post-Transcriptional Regulation:** A striking feature of this cell type is the high significance of a broad suite of genes involved in RNA metabolism. This includes the RNA helicase [DDX5](/details-gene/1655), heterogeneous nuclear ribonucleoprotein [HNRNPA2B1](/details-gene/3181), splicing factor [SRSF5](/details-gene/6430), and poly(A)-binding protein [PABPC1](/details-gene/26986). The high expression specificity of these genes suggests that extensive and precise control of mRNA splicing, stability, and translation is a core feature of this cell's biology, likely enabling rapid and plastic responses to environmental signals. The significance of the long non-coding RNA [NEAT1](/details-gene/283131), a key component of nuclear paraspeckles, further underscores a role in complex gene regulation. * **Specialized Metabolic Programs:** These cells exhibit a distinctive metabolic profile. * **Polyamine Catabolism:** The top marker, [SAT1](/details-gene/6303), and another highly significant gene, [OAZ1](/details-gene/4946), are central regulators of polyamine metabolism. [SAT1](/details-gene/6303) is the rate-limiting enzyme in polyamine catabolism ([Link](https://doi.org/10.1016/s0021-9258(17)35245-6)). This pathway is critical for cell growth, differentiation, and stress responses, and its prominence suggests a key role in modulating the function and fate of these monocytes. * **Iron Homeostasis:** The high significance of both ferritin heavy chain ([FTH1](/details-gene/2495)) and light chain ([FTL](/details-gene/2512)) indicates a crucial function in iron sequestration and management. This capacity is vital in the context of inflammation, where iron availability can influence both host defense and pathogen survival. * **Energy Metabolism:** A suite of genes encoding components of the mitochondrial respiratory chain, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), and [ATP5F1E](/details-gene/514), are highly significant, pointing to a high energetic demand likely required to support their surveillance and effector functions. * **Immune Modulation and Antigen Presentation:** The non-classical MHC class I molecule [HLA-E](/details-gene/3133) and its requisite light chain [B2M](/details-gene/567) are defining markers. [HLA-E](/details-gene/3133) typically presents a restricted set of peptides derived from other MHC class I molecules and interacts with inhibitory receptors on [NK cells](/details-cell/CL0000623) and subsets of [T-cells](/details-cell/CL0000084) ([Link](https://pubmed.ncbi.nlm.nih.gov/3260916/)). This suggests that a primary role of non-classical monocytes is to regulate the activity of other cytotoxic lymphocytes, potentially preventing excessive tissue damage during immune surveillance. * **Cytoskeletal Dynamics and Signaling:** The high significance of genes like [CFL1](/details-gene/1072) (cofilin) and [MYL6](/details-gene/4637) (myosin light chain) is consistent with the known patrolling behavior of these cells, which requires active cytoskeletal remodeling for migration along the endothelium. Furthermore, key signaling adapter proteins such as [YWHAB](/details-gene/7529) and [YWHAZ](/details-gene/7534) (14-3-3 proteins) are prominent markers, indicating a capacity to integrate diverse intracellular signaling pathways. ## Clinical Significance and Contextual Roles The gene signature of [CD14-low, CD16-positive monocytes](/details-cell/CL0002396) suggests potential involvement in a range of physiological and pathological processes. The prominence of [HLA-E](/details-gene/3133) suggests a critical role in mediating the interface between innate and adaptive immunity, with implications for viral infections, cancer immunotherapy, and transplantation, where the regulation of NK cell activity is paramount. Dysregulation of its expression on these monocytes could alter immune tolerance and surveillance. A particularly notable finding is the high significance of [ITM2B](/details-gene/9445), a gene linked to amyloid formation in familial British and Danish dementias ([Link](https://doi.org/10.1038/21637)). Non-classical monocytes are known to patrol the vasculature, including the blood-brain barrier. The specific expression of an amyloid-associated protein may indicate a previously unappreciated role for this cell type in the pathogenesis of neurodegenerative diseases, potentially involving clearance or deposition of amyloidogenic peptides. Furthermore, the strong signature for polyamine metabolism, driven by [SAT1](/details-gene/6303), has clinical relevance, as polyamine levels are frequently dysregulated in cancer and inflammatory diseases. The inducibility of [SAT1](/details-gene/6303) suggests that this metabolic pathway may be dynamically regulated in response to pathological stimuli, positioning these cells as key metabolic modulators in the tissue microenvironment. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** [CD14-low, CD16-positive monocytes](/details-cell/CL0002396) couple immune suppression with metabolic control at sites of endothelial surveillance. We propose that these cells utilize high-level expression of [HLA-E](/details-gene/3133) to deliver inhibitory signals to cytotoxic lymphocytes (e.g., [NK cells](/details-cell/CL0000623)), while simultaneously managing local iron homeostasis through the ferritin complex ([FTH1](/details-gene/2495)/[FTL](/details-gene/2512)). This dual function may serve to create a localized, non-inflammatory microenvironment conducive to tissue integrity and repair, preventing excessive damage from patrolling immune cells. * **Surprising Findings:** The co-emergence of a non-classical antigen presentation molecule and iron metabolism machinery as top defining features suggests that these two processes are functionally linked in this cell type, moving beyond simple housekeeping roles. * **Testable Questions:** Does the targeted knockdown of [FTH1](/details-gene/2495) in [CD14-low, CD16-positive monocytes](/details-cell/CL0002396) alter their surface expression of [HLA-E](/details-gene/3133) or their capacity to inhibit NK cell degranulation in a co-culture system? 2. **Hypothesis:** The highly active polyamine catabolism pathway in [CD14-low, CD16-positive monocytes](/details-cell/CL0002396) is a critical regulator of their functional phenotype and may be linked to their role in neurovascular surveillance. We hypothesize that the rate of polyamine flux, controlled by [SAT1](/details-gene/6303), dictates the cell's inflammatory potential and influences its handling of amyloidogenic proteins like the one encoded by the significant marker gene [ITM2B](/details-gene/9445). Dysregulation of this metabolic axis could contribute to neuroinflammatory conditions by altering the monocyte's ability to clear or process pathological protein aggregates at the blood-brain barrier. * **Surprising Findings:** The identification of a gene ([ITM2B](/details-gene/9445)) associated with rare familial dementias as a specific marker for a peripheral blood monocyte is unexpected and suggests a direct link between peripheral immunity and central nervous system proteinopathies. * **Testable Questions:** How does pharmacological inhibition of [SAT1](/details-gene/6303) in primary human non-classical monocytes affect their transcriptomic profile, particularly the expression of inflammatory cytokines and [ITM2B](/details-gene/9445), following stimulation with amyloid-beta peptides?