Details for: CL0010008

Cell ID: CL0010008

Cell Name: cardiac endothelial cell

Description: Any endothelial cell that is part of some heart.

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 cardiac endothelial 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 cardiac endothelial 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 cardiac endothelial 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 cardiac endothelial 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:  cardiac endothelial cell (CL0010008)

 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 [cardiac endothelial cell](/details-cell/CL0010008) is a specialized endothelial cell lining the heart chambers and coronary vasculature. Based on gene significance analysis in the **Overall** context, this cell type exhibits a highly unusual and specific transcriptional profile. While expressing canonical endothelial markers, it is uniquely defined by a strong signature of genes typically associated with cardiomyocytes, such as [MYH7](/details-gene/4625), [TCAP](/details-gene/8557), and [MYOZ2](/details-gene/51778). This suggests a specialized role beyond simple barrier function, potentially involving deep integration with myocardial contractile processes and mechanotransduction. Furthermore, the profile indicates an active role in immune surveillance through antigen presentation machinery, balanced by a surprisingly low signature for mitochondrial respiratory genes, pointing towards a distinct metabolic state compared to the surrounding tissue. ## Key Characteristics and Function Analysis of gene expression specificity (`csi_z`) highlights several functional clusters that define the [cardiac endothelial cell](/details-cell/CL0010008). * **Muscle-Associated and Structural Proteins:** A striking feature is the high specificity score for genes integral to sarcomere structure and function. [MYH7](/details-gene/4625), encoding the beta-myosin heavy chain, is a dominant marker, alongside [TCAP](/details-gene/8557) (Telethonin) and [MYOZ2](/details-gene/51778), both Z-disc associated proteins. While the classic endothelial marker [VWF](/details-gene/7450) (von Willebrand Factor) is also significant, the prominence of these muscle-related genes suggests either an unappreciated hybrid phenotype or an exceptionally intimate functional crosstalk with adjacent cardiomyocytes. * **Immune and Antigen Presentation:** The high significance of [B2M](/details-gene/567) (Beta-2-microglobulin) and [HLA E](/details-gene/3133) indicates that these cells are equipped for antigen presentation via MHC class I molecules. This is consistent with the role of vascular endothelium in immune surveillance, allowing for the presentation of intracellular antigens to circulating immune cells, particularly cytotoxic T lymphocytes. * **Cell Adhesion and Signaling:** A diverse set of genes related to cell interaction and signaling are specifically expressed. These include the metalloproteinase [ADAM23](/details-gene/8745), the adhesion G protein-coupled receptor [ADGRB3](/details-gene/577), and the G-protein signaling regulator [RGS5](/details-gene/8490). The presence of [NLGN1](/details-gene/22871), a neuroligin typically involved in synaptic junctions, further points to complex and stable cell-cell communication networks. * **Metabolic Profile:** The anti-marker profile is strongly dominated by genes involved in mitochondrial oxidative phosphorylation. Genes encoding subunits of all major respiratory complexes, including [COX1](/details-gene/4512), [COX3](/details-gene/4514), [ATP6](/details-gene/4508), [ND1](/details-gene/4535), [ND4](/details-gene/4538), and [CYTB](/details-gene/4519), show significant negative specificity scores. This does not imply these cells lack mitochondrial function, but rather that their expression of these genes is significantly lower relative to other cells in the cardiac tissue, most notably the mitochondrion-rich cardiomyocytes. This suggests a potential metabolic specialization, possibly with a greater reliance on glycolysis. ## Clinical Significance and Contextual Roles The unique gene signature of [cardiac endothelial cells](/details-cell/CL0010008) has direct implications for cardiovascular health and disease. The high specificity of [MYH7](/details-gene/4625), a gene whose mutations are a primary cause of hypertrophic cardiomyopathy, is particularly noteworthy. While its role in cardiomyocytes is well-established, its specific expression in cardiac endothelium may suggest a role for these cells in sensing or contributing to the pathological mechanical stress seen in this disease. Similarly, the marker [TECRL](/details-gene/253017) has been identified as a gene associated with life-threatening arrhythmias ([Link](https://doi.org/10.15252/emmm.201505719)), and its presence in endothelial cells could implicate them in cardiac electrophysiology or related signaling pathways. The expression of [VWF](/details-gene/7450) underscores the cell's central role in hemostasis and thrombosis within the coronary circulation, a key process in myocardial infarction. The regulator of G-protein signaling, [RGS5](/details-gene/8490), is known to be expressed in pericytes and is involved in vascular maturation and stabilization; its high score here may reflect the tight association of endothelial cells with pericytes or a direct role in vascular tone regulation. The negative signature for mitochondrial genes like [SOD1](/details-gene/6647), which protects against oxidative stress, could suggest a particular vulnerability of these cells to ischemic injury, a critical factor in heart disease. Understanding this unique metabolic and structural profile is therefore crucial for developing targeted therapies for a range of cardiac pathologies. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Cardiac endothelial cells express a suite of sarcomere-associated proteins not as a contractile apparatus, but as a sophisticated mechanosensing system to respond to the continuous, high-amplitude hemodynamic forces of the beating heart. This "molecular strain gauge" could directly translate mechanical signals into biochemical pathways that regulate vascular tone and communication with cardiomyocytes. * **Surprising Findings:** The presence of major structural components of the cardiomyocyte sarcomere, such as [MYH7](/details-gene/4625) and [TCAP](/details-gene/8557), as highly specific markers for an endothelial cell type is unexpected and challenges the canonical view of endothelial function. * **Testable Questions:** Can super-resolution microscopy and proximity-ligation assays detect a non-sarcomeric, organized network of MYH7 and TCAP at the basal membrane of [cardiac endothelial cells](/details-cell/CL0010008) in situ? Does acute modulation of cardiac pressure and shear stress alter the phosphorylation state or localization of these proteins within these cells? 2. **Hypothesis:** The distinct metabolic profile of [cardiac endothelial cells](/details-cell/CL0010008), characterized by a low transcriptional signature for oxidative phosphorylation machinery, represents a metabolic specialization to thrive in the fluctuating oxygen environment of the cardiac microcirculation. This glycolytic preference may confer resistance to transient hypoxia and allow these cells to allocate metabolic resources towards specialized functions like signaling and transport. * **Surprising Findings:** The strong and consistent negative enrichment for numerous core mitochondrial respiratory chain genes ([COX1](/details-gene/4512), [ND1](/details-gene/4535), [CYTB](/details-gene/4519), etc.) is counterintuitive for cells in the highly aerobic environment of the heart, suggesting their metabolic program is fundamentally different from that of their cardiomyocyte neighbors. * **Testable Questions:** Using Seahorse metabolic flux analysis on isolated [cardiac endothelial cells](/details-cell/CL0010008), what is their basal oxygen consumption rate (OCR) and extracellular acidification rate (ECAR) compared to cardiac myocytes? How does the ratio of glycolysis to oxidative phosphorylation in these cells change in response to hypoxic challenge?