Details for: CL4023072

Cell ID: CL4023072

Cell Name: brain vascular cell

Description: A cell that is part of the brain vasculature.

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 brain vascular 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 brain vascular 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 brain vascular 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 brain vascular 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:  brain vascular cell (CL4023072)

 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 [brain vascular cell](/details-cell/CL4023072) is defined as a cellular component of the brain's vasculature. However, its gene significance profile reveals a striking and highly specific expression of genes predominantly associated with neuronal function. **Overall**, the top markers based on expression specificity (`csi_z`) are not canonical vascular genes, but rather a suite of neurotransmitter receptors, transporters, and synaptic adhesion molecules. This suggests that this cell type may not be a conventional endothelial cell or pericyte, but rather a highly specialized cell at the neurovascular interface, potentially equipped to directly sense and respond to synaptic activity. The top defining marker, [PRSS55](/details-gene/203074), is a serine protease with a less-defined role, indicating a unique functional aspect of this cell type. ## Key Characteristics and Function Analysis of the top marker genes reveals several functional clusters that deviate significantly from typical vascular cell biology, pointing towards a deep integration with neural circuits. * **Neurotransmitter Sensing and Transport:** A prominent functional signature is the specific expression of genes involved in GABAergic and glutamatergic signaling. This includes the GABA-A receptor subunit [GABRB1](/details-gene/2560), the GABA transporter [SLC6A1](/details-gene/6529), and the metabotropic glutamate receptor [GRM3](/details-gene/2913). The presence of these components suggests a capacity to directly sense the local concentrations of major inhibitory and excitatory neurotransmitters. * **Synaptic Adhesion and Organization:** The cell expresses an array of molecules typically found at neuronal synapses, indicating a potential for forming stable, structured cell-cell junctions with neurons. Key markers include [NRXN1](/details-gene/9378) (Neurexin-1), [NLGN1](/details-gene/22871) (Neuroligin-1), [CADM2](/details-gene/253559), and protocadherin [PCDHGB5](/details-gene/56101). This molecular machinery is central to synapse formation and stabilization, and its expression in a vascular context is highly unusual. * **Signal Transduction and Ion Channel Activity:** The expression of genes like [KCNIP4](/details-gene/80333) (potassium channel interacting protein) and [NALF1](/details-gene/728215) (a cation channel) suggests the cell can generate and modulate electrochemical signals. Furthermore, G protein-coupled receptors such as [ADGRB3](/details-gene/577) and [ADGRL3](/details-gene/23284) underscore a sophisticated signal integration capability. * **Complement System Component:** A high specificity score for [C7](/details-gene/730), a component of the membrane attack complex, is notable. This may indicate a specialized role in immune surveillance at the blood-brain barrier or in non-canonical functions like synaptic pruning or plasticity, where complement has been implicated. The **Anti_Markers** profile is equally informative. The cell shows significantly lower expression of genes involved in ubiquitous cellular processes, including mRNA processing ([HNRNPU](/details-gene/3192), [HNRNPA2B1](/details-gene/1657)), general metabolism ([GAPDH](/details-gene/2597)), and mitochondrial function ([ATP6](/details-e-gene/4508), [COX3](/details-gene/4514)). The strong negative signature for [B2M](/details-gene/567), a key component of MHC class I molecules, may suggest a mechanism of immune privilege or evasion. This pattern suggests a highly specialized, rather than a generally active, cellular state. ## Clinical Significance and Contextual Roles Although the analysis is limited to a single **Overall** context, the unique gene profile of this cell type has significant clinical implications, particularly for neurodevelopmental and neuropsychiatric disorders. Several top marker genes are directly linked to human neurological conditions. For instance, [NRXN1](/details-gene/9378) is a well-established risk gene for autism spectrum disorder and schizophrenia ([Link](https://doi.org/10.1016/j.ajhg.2007.09.011)). [IL1RAPL1](/details-gene/11141) is associated with X-linked mental retardation ([Link](https://doi.org/10.1038/12623)). The specific expression of these genes by a vascular-associated cell suggests that defects in neurovascular communication, mediated by this cell type, could be a contributing factor to the pathology of these disorders. Dysfunction in this cell's ability to sense neurotransmitter levels via [GABRB1](/details-gene/2560) or [GRM3](/details-gene/2913) could lead to mismatches between neuronal activity and local blood flow, a phenomenon observed in various neurological diseases. The profile challenges the conventional view that vascular contributions to brain disease are limited to stroke and hemorrhage, highlighting a potential role in the substrate of cognitive and developmental disorders. ## Potential Mechanisms and Research Directions The data provokes fundamental questions about the identity and function of this cell within the brain's microenvironment. 1. **Hypothesis: This cell is a specialized component of the neurovascular unit, acting as a direct sensor of synaptic activity.** The striking co-expression of neurotransmitter receptors, transporters, and synaptic adhesion molecules suggests this cell forms tight, synapse-like junctions with neurons. This would enable it to monitor local synaptic transmission in real-time and potentially regulate microcirculatory blood flow with high spatiotemporal precision, a process critical for normal brain function. * **Surprising Findings:** The expression of a nearly complete pre- and post-synaptic adhesion complex ([NRXN1](/details-gene/9378) and [NLGN1](/details-gene/22871), respectively) on a cell classified as vascular is unprecedented and suggests a much more intimate and structured relationship with neurons than previously understood for vascular cells. * **Testable Questions:** Using high-resolution imaging (e.g., expansion microscopy or electron microscopy) in brain tissue, can physical junctions be identified between these cells (marked by [PRSS55](/details-gene/203074)) and neuronal synapses? Furthermore, does optogenetic stimulation of local neurons evoke a calcium response in these vascular cells that is blockable by antagonists of GABA and glutamate receptors? 2. **Hypothesis: The "brain vascular cell" signature represents significant neuronal contamination or a fundamental mis-annotation of a neuronal subtype.** The overwhelming neuronal character of the top markers, and the absence of canonical pan-endothelial or pericyte markers, raises the possibility that the data originates from neurons that were incorrectly sorted or labeled. This population may represent a specific neuronal subtype that, due to its location or physical properties, co-purified with vascular components. * **Surprising Findings:** The top marker, [PRSS55](/details-gene/203074), is not a well-established neuronal marker, leaving the cell's identity ambiguous. Moreover, the strong negative significance for housekeeping and mitochondrial genes like [GAPDH](/details-gene/2597) and [ATP6](/details-gene/4508) is atypical for most known neuron types, suggesting this profile does not match a classic neuronal population. * **Testable Questions:** Does single-molecule fluorescent in situ hybridization (smFISH) in brain tissue sections show co-localization of [PRSS55](/details-gene/203074) mRNA with canonical vascular markers (e.g., *CDH5*, *PECAM1*) or with pan-neuronal markers (e.g., *RBFOX3*)? This would definitively resolve whether this gene signature arises from a vascular cell, a neuron, or a previously uncharacterized hybrid cell type.