Details for: CL0002629

Cell ID: CL0002629

Cell Name: mature microglial cell

Description: Mature microglia are reportedly CCR2-positive, CD4-positive, CD9-positive, CD11a-positive, CD11b-positive, CD11c-positive, CD13-positive, CD16-positive, CDw17-positive, CD18-positive, CD21-positive, CD26-negative, CD32-positive, CD35-positive, CD36-positive, CD40-positive, CD44-positive, CD45-positive, CD53-positive, CD54-positive, CD56-negative, CD58-positive, CD63-positive, CD64-positive, CD66-positive, CD80-positive, CD86-positive, CD87-positive, CD92-positive, CD106-positive, CD107a-positive, CD147-positive, CD155-positive, CD162-positive, CD163-positive, CD171-negative, CD200R-positive, CXCR3-positive, CX3CR1-positive, fibronectin-positive, GD3-positive, GLUT1-positive, GLUT3-negative, GLUT5-positive, MHCI-positive, MHCII-positive, P2X4-positive, RFD7-negative, RGS5-negative, alpha-SMA-negative, vimentin-positive, and vwf-negative. Mature microglia are capable of producing BDNF, CCL3, CCL5, CCL7, CCL8, CCL9, CCL19, CCL20,CD40L, CSF, CXCL1, CXCL2, CXCL4, CXCL5, CXCL8, CXCL9, CXCL10, glutamate, IL-1beta, IL-1ra, IL-3, IL-6, IL-10, IL-12, LT, MMP-2, MMP-9, NGF, nitric oxide, ROS, TGF-beta, TNF-alpha.

Synonyms: mature microglia, activated microglia, reactive microglia

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 mature microglial 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 mature microglial 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 mature microglial 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 mature microglial 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:  mature microglial cell (CL0002629)

 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 [mature microglial cell](/details-cell/CL0002629) is a specialized resident macrophage of the central nervous system, canonically defined by its immunological surveillance and response functions. The provided gene significance data, however, reveals a striking molecular identity for this cell type that is dominated by genes involved in neuronal interaction, cell adhesion, and synaptic function. The **Overall** context shows top markers like the glutamate receptor subunit [GRID2](/details-gene/2895) and the glutamate transporter [SLC1A3](/details-gene/6507), suggesting a primary role in modulating neurotransmitter signaling and maintaining synaptic integrity. This profile, coupled with a strong negative signature for core metabolic genes, portrays the [mature microglial cell](/details-cell/CL0002629) as a deeply integrated component of neural circuitry, with a unique transcriptional state poised for interaction with its neuronal environment. ## Key Characteristics and Function Analysis of the top markers based on expression specificity (CSI Z-score) highlights several functional clusters that define the [mature microglial cell](/details-cell/CL0002629). * **Synaptic and Neuronal Communication:** A substantial number of top-ranking genes are directly involved in synaptic structure and signaling. The high specificity of the glutamate ionotropic receptor delta type subunit 2 ([GRID2](/details-gene/2895)) and the high-affinity glutamate transporter [SLC1A3](/details-gene/6507) indicates a profound involvement in the glutamate neurotransmitter system. This is further supported by the high significance of genes encoding presynaptic ([NRXN1](/details-gene/9378), [NRXN3](/details-gene/9369)) and postsynaptic ([DLG2](/details-gene/1740)) scaffolding proteins, as well as the calcium sensor for neurotransmitter release, [SYT1](/details-gene/6857). This molecular signature suggests that these cells are not merely passive surveyors but may actively participate in monitoring and modulating synaptic activity. * **Cell Adhesion and Extracellular Matrix Interaction:** The identity of these cells is also strongly shaped by genes mediating cell-cell and cell-matrix interactions. These include [CADM2](/details-gene/253559), [DSCAM](/details-gene/1826), and [ADGRB3](/details-gene/577), which are implicated in homophilic adhesion and nervous system development. Furthermore, the high specificity of [SPARCL1](/details-gene/8404) and the cytokine [SPP1](/details-gene/6696) (Osteopontin) points to a role in structuring the extracellular environment and mediating inflammatory or regenerative signals. * **Ion Homeostasis and Signaling:** Key ion channels and transporters, such as the potassium channel [KCNQ3](/details-gene/3786) and the sodium/calcium exchanger [SLC8A1](/details-gene/6546), are defining markers. This highlights the importance of maintaining precise ion gradients, likely crucial for responding to neuronal activity and regulating their own signaling cascades. * **Immune Identity and Regulation:** While neuronal-interaction genes dominate, the presence of the pan-leukocyte marker [PTPRC](/details-gene/5788) (CD45) as a significant marker confirms the cell's hematopoietic origin. The transcription factor [MEF2C](/details-gene/4208), a known critical regulator for microglial development and identity, is also highly specific, underscoring its role in maintaining this unique transcriptional program. Conversely, the anti-marker profile is exceptionally informative. The most specific negative markers are a large cohort of genes encoding components of the mitochondrial electron transport chain, including subunits of cytochrome c oxidase ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX3](/details-gene/4514)) and NADH dehydrogenase ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), [ND4](/details-gene/4538)). This strong negative signature for oxidative phosphorylation machinery suggests that, relative to other cells in the CNS, the basal metabolic state of [mature microglial cells](/details-cell/CL0002629) is not defined by high aerobic respiration. Similarly, the negative scores for ubiquitous housekeeping genes like [GAPDH](/details-gene/2597), [UBC](/details-gene/7316), and ferritin ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)) underscore that their expression, while present, is not a unique or defining feature of this cell type. ## Clinical Significance and Contextual Roles The gene signature of the [mature microglial cell](/details-cell/CL0002629) provides significant insight into its potential roles in CNS health and disease. The prominent expression of genes involved in glutamate homeostasis ([SLC1A3](/details-gene/6507)) and synaptic adhesion ([NRXN1](/details-gene/9378), [DSCAM](/details-gene/1826)) firmly implicates these cells in processes of synaptic pruning during development and the pathological synaptic loss seen in neurodegenerative disorders like Alzheimer's and Parkinson's disease. Indeed, mutations in [NRXN1](/details-gene/9378) have been associated with autism spectrum disorder ([Link](https://doi.org/10.1016/j.ajhg.2007.09.011)), suggesting that microglial dysfunction could contribute to neurodevelopmental conditions. The high specificity of [SPP1](/details-gene/6696) is also clinically relevant, as osteopontin is a pro-inflammatory cytokine that is upregulated in numerous neurological conditions, including multiple sclerosis and traumatic brain injury, where it can mediate both detrimental and protective effects. The transcription factor [MEF2C](/details-gene/4208) is crucial for microglial responses to amyloid-beta, and its dysregulation is directly linked to Alzheimer's disease pathology. The unique metabolic profile indicated by the anti-markers is also of clinical interest. A quiescent, potentially glycolytic-leaning state may allow microglia to rapidly switch to a high-energy, pro-inflammatory phenotype upon detecting pathological stimuli. Understanding the regulation of this metabolic switch could offer therapeutic targets for modulating neuroinflammation. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The profound enrichment of synaptic gene expression in [mature microglial cells](/details-cell/CL0002629) reflects a primary function in the active, real-time modulation of neural circuit activity, extending beyond their canonical role as passive surveyors and phagocytes. These cells may use proteins like [GRID2](/details-gene/2895) and [SYT1](/details-gene/6857) to directly sense and respond to synaptic transmission, thereby influencing synaptic strength and plasticity. * **Surprising Findings:** The ranking of a glutamate receptor subunit ([GRID2](/details-gene/2895)) as the top specificity marker for an immune cell is highly unexpected. It suggests that sensing neurotransmitters may be more central to this cell's unique identity than sensing traditional immune signals in the homeostatic brain. * **Testable Questions:** Does conditional knockout of microglial [GRID2](/details-gene/2895) in adult mice lead to deficits in motor learning or memory consolidation tasks known to be dependent on cerebellar or hippocampal plasticity? 2. **Hypothesis:** The strong negative signature for mitochondrial oxidative phosphorylation genes indicates that [mature microglial cells](/details-cell/CL0002629) maintain a state of metabolic quiescence or a glycolytic bias at baseline. This metabolic posture may be a key feature of their "ready" state, enabling rapid deployment of energetic resources for effector functions like cytokine production and phagocytosis upon activation, a process known as metabolic reprogramming. * **Surprising Findings:** It is counterintuitive for a highly motile and vigilant cell to be defined by a relative lack of expression of core aerobic respiration genes. This finding challenges the assumption that surveillance is an energy-intensive process reliant on oxidative phosphorylation and suggests an alternative metabolic strategy for CNS immune readiness. * **Testable Questions:** Using single-cell metabolic analysis (e.g., scMito-Seq) of fresh brain tissue, do [mature microglial cells](/details-cell/CL0002629) exhibit significantly lower transcript levels for [COX1](/details-gene/4512) and [ATP6](/details-gene/4508) compared to neighboring neurons and astrocytes, and does this transcriptional state correlate with a lower mitochondrial membrane potential at baseline?