Details for: CL0009092

Cell ID: CL0009092

Cell Name: endothelial cell of placenta

Description: An endothelial cell that is part of a placenta.

Synonyms: placental endothelial cell

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 endothelial cell of placenta 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 endothelial cell of placenta. 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 endothelial cell of placenta. 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 endothelial cell of placenta. 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:  endothelial cell of placenta (CL0009092)

 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 [endothelial cell of placenta](/details-cell/CL0009092) is a specialized endothelial cell type forming the lining of blood vessels within the placenta, critical for maternal-fetal exchange. Gene significance analysis (**Overall**) reveals that this cell is defined not only by its high metabolic activity but also by a remarkably complex and specific machinery for post-transcriptional gene regulation. The top markers include a large cohort of RNA-binding proteins and splicing factors such as [ARGLU1](/details-gene/55082) and [HNRNPC](/details-gene/3183), alongside numerous genes essential for energy production like [COX2](/details-gene/4513) and [GAPDH](/details-gene/2597). This profile suggests a cell that is highly plastic and transcriptionally dynamic, continuously adapting to the complex signaling environment of the placenta. The top marker, [ITM2B](/details-gene/9445), primarily known for its role in familial dementia, points towards unique protein processing functions in this cell type. ## Key Characteristics and Function Analysis of top marker genes, ranked by expression specificity (Z-Score CSI), highlights several core functional axes for the placental endothelial cell. * **Post-Transcriptional and RNA Processing Hub:** A dominant characteristic of this cell is the highly specific expression of numerous genes involved in RNA processing. This includes factors for alternative splicing ([ARGLU1](/details-gene/55082), [SON](/details-gene/6651), [RBM39](/details-gene/9584)), general mRNA splicing and stability ([HNRNPC](/details-gene/3183), [HNRNPA2B1](/details-gene/3181), [YBX1](/details-gene/4904)), RNA helicase activity ([DDX5](/details-gene/1655), [DDX17](/details-gene/10521)), and poly(A) binding ([PABPC1](/details-gene/26986)). This extensive suite of RNA-modifying machinery suggests that placental endothelial cells rely heavily on post-transcriptional regulation to fine-tune gene expression, likely enabling rapid adaptations in cell function, permeability, and angiogenesis in response to maternal and fetal signals. * **High Metabolic and Bioenergetic Activity:** The cell exhibits a strong signature of high energy demand. Multiple top markers are core components of the mitochondrial electron transport chain and oxidative phosphorylation, including [COX2](/details-gene/4513), [ATP6](/details-gene/4508), [CYTB](/details-gene/4519), [COX1](/details-gene/4512), [ATP5F1E](/details-gene/514), [ND3](/details-gene/4537), and [ND4](/details-gene/4538). The high specificity of the key glycolytic enzyme [GAPDH](/details-gene/2597) further underscores this cell's profound metabolic activity, which is essential to support active transport and biosynthesis at the maternal-fetal interface. * **Protein Processing and Quality Control:** The high specificity of [ITM2B](/details-gene/9445), a gene whose mutations are associated with amyloid peptide formation in familial dementias ([Link](https://doi.org/10.1038/21637), [Link](https://doi.org/10.1073/pnas.080076097)), suggests a specialized role in protein processing or clearance within the placenta. Additionally, the ubiquitin-conjugating enzyme [UBE2D3](/details-gene/7323) is a top marker, indicating a robust system for protein polyubiquitination and turnover, which is critical for managing the high rate of protein synthesis and responding to cellular stress. * **Maternal-Fetal Immune Interface:** The non-classical MHC class I molecule [HLA-E](/details-gene/3133) is a defining marker for this cell type. [HLA-E](/details-gene/3133) plays a crucial role in immune tolerance by engaging inhibitory receptors on maternal Natural Killer (NK) cells, thereby preventing an immune attack on fetal-derived placental tissues. Its high expression underscores the placental endothelial cell's active participation in maintaining immune privilege during pregnancy. * **Cell Identity and Lineage:** The anti-marker profile helps to delineate the cell's identity. The low significance of genes like [PRG2](/details-gene/5553) (an eosinophil granule protein) and [CLEC4M](/details-gene/10332) (a C-type lectin found on other endothelial populations like liver sinusoidal endothelial cells) confirms its distinct endothelial, non-hematopoietic lineage and highlights its specialization compared to endothelial cells in other tissues. ## Clinical Significance and Contextual Roles **Overall**, the gene significance profile points to key areas of vulnerability and function relevant to placental health and pregnancy outcomes. The profound reliance on post-transcriptional regulation suggests that disruptions in splicing or mRNA stability could be central to the pathophysiology of placental disorders. Dysregulation of genes like [SON](/details-gene/6651) or [HNRNPC](/details-gene/3183) could lead to aberrant expression of angiogenic factors, transporters, or immune modulators, potentially contributing to conditions like pre-eclampsia or intrauterine growth restriction (IUGR). The prominent mitochondrial gene signature highlights the cell's dependence on oxidative phosphorylation. This makes placental endothelial cells susceptible to mitochondrial dysfunction and oxidative stress, which are known factors in the pathogenesis of pre-eclampsia. The specific expression of [ITM2B](/details-gene/9445) is particularly noteworthy. While its established link is to neurodegeneration through amyloid formation ([Link](https://doi.org/10.1038/21637)), its function in the placenta is unknown. It may play a role in processing placental hormones or clearing protein aggregates, and its dysfunction could potentially contribute to the protein deposition seen in conditions like pre-eclampsia. Finally, the high significance of [HLA-E](/details-gene/3133) reinforces the critical role of these cells in establishing and maintaining maternal immune tolerance. Polymorphisms or altered expression of [HLA-E](/details-gene/3133) on placental endothelial cells could disrupt the delicate immune balance, potentially leading to inflammatory complications or recurrent pregnancy loss. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The highly specific enrichment of a large suite of RNA-binding proteins ([ARGLU1](/details-gene/55082), [HNRNPC](/details-gene/3183), [SON](/details-gene/6651)) indicates that placental endothelial cells utilize extensive alternative splicing to generate a dynamic proteome, enabling rapid adaptation of vascular permeability, nutrient transport, and immune signaling in response to the fluctuating hormonal and metabolic environment of pregnancy. * **Surprising Findings:** The sheer number of splicing and RNA processing factors among the top 20 most specific markers is unexpected. This suggests that post-transcriptional regulation is not merely a housekeeping function but a core, defining feature of this cell's specialized identity, potentially rivaling transcriptional regulation in importance for its function. * **Testable Questions:** How does the alternative splicing landscape of placental endothelial cells change in response to key pregnancy-related signals like hypoxia, estrogen, or inflammatory cytokines (e.g., TNF-alpha)? Can single-cell RNA-seq combined with long-read sequencing identify specific splice isoforms regulated by top factors like [ARGLU1](/details-gene/55082) that are critical for endothelial barrier function or angiogenesis? 2. **Hypothesis:** The top defining marker, [ITM2B](/details-gene/9445), performs a critical, non-pathological proteolytic processing function in placental endothelial cells, essential for either the maturation of placental-specific growth factors/hormones or the clearance of potentially toxic peptide aggregates generated by high metabolic activity. * **Surprising Findings:** It is highly unexpected that the most specific genetic marker for a placental vascular cell is a gene whose known mutations cause familial British and Danish dementia via amyloidogenesis ([Link](https://doi.org/10.1038/21637)). This implies a shared molecular pathway between neurodegeneration and placental biology, possibly centered on the processing of aggregation-prone proteins. * **Testable Questions:** What are the protein interaction partners of [ITM2B](/details-gene/9445) in primary human placental endothelial cells as identified by co-immunoprecipitation and mass spectrometry? Do expression levels or cleavage patterns of [ITM2B](/details-gene/9445) differ between normal placentas and those from pregnancies complicated by protein-aggregation-related pathologies like pre-eclampsia?