Details for: CL0000183

Cell ID: CL0000183

Cell Name: contractile cell

Description: A cell whose primary function is to shorten.

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 contractile 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 contractile 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 contractile 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 contractile 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:  contractile cell (CL0000183)

 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 [contractile cell](/details-cell/CL0000183) is defined by its primary function of shortening or contraction. The gene significance profile suggests this is a highly specialized cell type, likely a smooth muscle cell or a related mural cell (e.g., pericyte), characterized by a sophisticated machinery for excitation-contraction coupling and a unique nuclear architecture. The top markers, calculated using a Z-score based Cell Significance Index (CSI) that emphasizes expression specificity, highlight a convergence of ion channel activity, structural contractile proteins, and synapse-associated molecules. The single most specific marker is the long non-coding RNA [NEAT1](/details-gene/283131), indicating that the maintenance of this cell's identity is deeply rooted in the organization of its nuclear transcriptome and chromatin structure. ## Key Characteristics and Function Analysis of top marker genes in the **Overall** context reveals several core functional clusters that define this cell's biology. * **Excitation-Contraction Coupling Machinery:** A prominent group of genes points to a sophisticated system for regulating membrane potential and calcium flux, the cornerstone of contraction. This includes high specificity scores for the L-type voltage-gated calcium channel subunit [CACNA1C](/details-gene/775), the voltage-gated potassium channel subunit [KCNAB1](/details-gene/7881), the stretch-activated cation channel [NALF1](/details-gene/728215), and the ryanodine receptor [RYR2](/details-gene/6262), which mediates calcium release from internal stores. Together, these genes orchestrate the electrochemical events that trigger cellular shortening. * **Core Contractile and Structural Apparatus:** The high significance of [MYH11](/details-gene/4629), the heavy chain for smooth muscle myosin, provides strong evidence for the cell's identity as a smooth muscle cell. This is complemented by the integrin subunit [ITGA8](/details-gene/8516), which is crucial for cell-matrix adhesion and is highly expressed in smooth muscle cells, suggesting a role in force transmission to the surrounding extracellular matrix. * **Receptor Signaling and Regulation:** The cell appears to be highly responsive to its microenvironment, as indicated by the specific expression of [PDGFRB](/details-gene/5159) (Platelet-Derived Growth Factor Receptor Beta). This receptor is a classic marker for mural cells like pericytes and vascular smooth muscle cells and is vital for their recruitment, proliferation, and stabilization of blood vessels. Other signaling components, such as [RGS6](/details-gene/9628) (Regulator of G protein signaling 6) and [DGKB](/details-gene/1607) (Diacylglycerol Kinase Beta), suggest tight control over G protein-coupled receptor and lipid-based signaling pathways that modulate the contractile state. * **Synaptic and Axon Guidance-Related Molecules:** A notable and potentially defining feature is the high specificity of genes typically associated with the nervous system and synapse formation. These include [NLGN1](/details-gene/22871) (Neuroligin-1), a postsynaptic cell-adhesion molecule, as well as [SLIT3](/details-gene/6586), [ADGRL3](/details-gene/23284), and [PTPRD](/details-gene/5789), which are all involved in neuronal guidance and synaptic organization. This pattern strongly suggests that these contractile cells are under direct and specialized neuronal regulation, possibly forming structures analogous to neuromuscular junctions. * **Nuclear Architecture and Transcriptional Control:** The top marker, [NEAT1](/details-gene/283131), is a lncRNA that is an essential structural component of nuclear paraspeckles. Its premier rank, alongside the X-inactivation lncRNA [XIST](/details-gene/7503) and transcription factors like [NPAS3](/details-gene/64067), indicates that a highly specific, three-dimensional nuclear organization is fundamental to establishing and maintaining the unique gene expression program required for the cell's contractile identity. The anti-marker profile confirms the non-immune, non-epithelial lineage of this cell, with very low significance for MHC class I genes ([HLA-C](/details-gene/3107), [HLA-B](/details-gene/3106), [B2M](/details-gene/567)). Furthermore, the negative CSI scores for many ubiquitous housekeeping genes involved in metabolism ([GAPDH](/details-gene/2597), [ATP6](/details-gene/4508)), splicing ([HNRNPA2B1](/details-gene/3181)), and protein turnover ([UBC](/details-gene/7316)) underscore the specialized nature of the `csi_z` score, which preferentially highlights genes with unique expression patterns over those that are broadly expressed, even if at high levels. ## Clinical Significance and Contextual Roles The gene signature of this [contractile cell](/details-cell/CL0000183) has significant clinical implications, particularly in vascular biology, neurology, and developmental disorders. The strong expression of [MYH11](/details-gene/4629) and [PDGFRB](/details-gene/5159) firmly links this cell type to the function of blood vessels. [MYH11](/details-gene/4629) mutations are known to cause thoracic aortic aneurysms and dissections, highlighting the cell's critical role in maintaining vascular integrity. Similarly, dysregulation of [PDGFRB](/details-gene/5159) signaling is implicated in numerous pathologies, including fibrosis and tumor angiogenesis, where these cells (as pericytes) are key players. The enrichment for neuronal-associated genes may provide insight into diseases where neuro-vascular communication is disrupted. For example, [NPAS3](/details-gene/64067) has been linked to schizophrenia in some families ([Link](https://doi.org/10.1136/jmg.40.5.325)), and while its role here is likely different, it points to a family of transcription factors critical for both neuronal and specialized non-neuronal cell function. The presence of [NLGN1](/details-gene/22871), typically studied in the context of autism spectrum disorders, in a vascular contractile cell suggests that neurodevelopmental pathways may be co-opted for establishing vascular innervation. Mutations in ion channel genes are well-established causes of channelopathies. For instance, variants in [CACNA1C](/details-gene/775) are associated with Timothy syndrome, which involves cardiac arrhythmias, and [RYR2](/details-gene/6262) mutations cause catecholaminergic polymorphic ventricular tachycardia. While this cell profile may not be cardiac, it indicates that similar ion channel-driven pathologies could manifest in other contractile tissues (e.g., vascular, gastrointestinal) dominated by this cell type. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The specific enrichment of synapse-associated molecules, particularly [NLGN1](/details-gene/22871), suggests that this [contractile cell](/details-cell/CL0000183) subtype forms highly organized, synapse-like junctions with innervating neurons (e.g., autonomic nerves) to achieve precise and rapid control of contraction, a mechanism more complex than simple diffuse neurotransmitter release. * **Surprising Findings:** The expression of a classic postsynaptic CNS adhesion molecule like [NLGN1](/details-gene/22871) as a defining marker for a peripheral contractile cell is unexpected. It implies that the molecular machinery for synaptogenesis is conserved and utilized at the neuro-effector junctions of tissues like blood vessels or visceral organs. * **Testable Questions:** Can super-resolution microscopy identify co-localization of [NLGN1](/details-gene/22871) on the contractile cell membrane with presynaptic markers (e.g., synaptophysin) on adjacent nerve terminals in relevant tissues? Does targeted knockout or blockade of [NLGN1](/details-gene/22871) in an animal model lead to impaired neurovascular coupling or altered autonomic regulation of organ function? 2. **Hypothesis:** The lncRNA [NEAT1](/details-gene/283131), as the top specificity marker, functions as a master regulator of this cell's identity by structuring nuclear paraspeckles that sequester specific RNA-binding proteins and transcription factors. This nuclear hub is proposed to be essential for maintaining the highly specialized transcriptional program of contraction while suppressing alternative cell fates. * **Surprising Findings:** It is remarkable that a non-coding structural RNA is a more specific marker than the core protein components of the contractile apparatus ([MYH11](/details-gene/4629)) or the primary calcium channels ([CACNA1C](/details-gene/775)). This suggests that the epigenetic and transcriptional regulatory layer of cell identity is even more unique and defining than its downstream functional effectors. * **Testable Questions:** Does antisense oligonucleotide-mediated knockdown of [NEAT1](/details-gene/283131) in primary cultures of these contractile cells cause a significant change in the expression of other key markers like [MYH11](/details-gene/4629) and [CACNA1C](/details-gene/775)? Furthermore, does loss of [NEAT1](/details-gene/283131) lead to the disassembly of paraspeckles and a subsequent up-regulation of genes associated with other mesenchymal lineages, such as fibroblasts or adipocytes?