Details for: CL0010022

Cell ID: CL0010022

Cell Name: cardiac neuron

Description: This term is used in 3 GO terms that were created as part of the heart development focus project.

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 cardiac neuron 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 neuron. 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 neuron. 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 neuron. 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 neuron (CL0010022)

 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 neuron](/details-cell/CL0010022) is a specialized neuron type integral to the intrinsic cardiac nervous system. Based on its gene significance profile, this cell is fundamentally defined by a highly specific and diverse repertoire of cell adhesion molecules, transmembrane receptors, and synaptic organizing proteins. **Overall**, the top marker genes, such as [ADGRB3](/details-gene/577), [CDH19](/details-gene/28513), and [NRXN3](/details-gene/9369), underscore its primary role in establishing and maintaining precise intercellular connections within the heart. This molecular signature suggests that the [cardiac neuron](/details-cell/CL0010022)'s function is critically dependent on its specific anatomical and signaling interactions with other neurons and cardiomyocytes, orchestrating local cardiac control. ## Key Characteristics and Function The functional identity of the [cardiac neuron](/details-cell/CL0010022) is overwhelmingly characterized by proteins involved in cell-cell interaction, synaptic architecture, and signal reception. * **Synaptic Adhesion and Neuronal Guidance:** A prominent feature is the high specificity of numerous cell adhesion molecules essential for neural circuit formation. This includes members of the neurexin family ([NRXN3](/details-gene/9369)), which are critical for synapse organization, as highlighted by pathway analysis. The cadherin superfamily member [CDH19](/details-gene/28513), and several members of the immunoglobulin superfamily, including [CADM2](/details-gene/253559), [CHL1](/details-gene/10752), [NTM](/details-gene/50863), [KIRREL3](/details-gene/84623), and [CNTN1](/details-gene/1272), further emphasize a sophisticated system for cell recognition and connection. The brain-specific angiogenesis inhibitor homolog [ADGRB3](/details-gene/577) also points to a role in guiding cellular organization ([Link](https://doi.org/10.1159/000134693)). * **Receptor-Mediated Signaling:** The [cardiac neuron](/details-cell/CL0010022) expresses a specific suite of receptors for sensing its microenvironment. Key markers include adhesion G protein-coupled receptors ([ADGRB3](/details-gene/577), [ADGRL3](/details-gene/23284)), which uniquely link cell adhesion events to intracellular signaling cascades. Furthermore, the high significance of ionotropic glutamate receptors ([GRIA1](/details-gene/2890), [GRID2](/details-gene/2895)) confirms its role in glutamatergic neurotransmission, a key excitatory pathway in the nervous system. * **Interaction with Myocardium:** A striking characteristic is the high specificity score for genes typically associated with muscle structure and function, namely [MYH7](/details-gene/4625) (beta-myosin heavy chain) and [TCAP](/details-gene/8557) (titin-capping protein). The expression of these genes in a neuron is unusual and may indicate a highly specialized structural or functional interface with cardiomyocytes, potentially for sensing or regulating contractility. This is supported by research on [NRXN3](/details-gene/9369), which identified heart-specific splicing variants potentially involved in intercellular connections with the extracellular matrix ([Link](https://doi.org/10.1016/s0006-291x(02)02403-8)). * **Transcriptional Regulation:** The transcription factor [ZNF536](/details-gene/9745) is a significant marker. Research has shown it to be a negative regulator of neuronal differentiation, suggesting it may play a role in maintaining the mature, specialized state of cardiac neurons ([Link](https://doi.org/10.1128/mcb.00362-09)). * **Cellular Identity Profile:** The anti-markers provide crucial context. The strong negative significance for a large number of mitochondrial genes (e.g., [ND1](/details-gene/4535), [ND4](/details-gene/4538), [COX1](/details-gene/4512), [CYTB](/details-gene/4519)) and ubiquitous housekeeping genes (e.g., [GAPDH](/details-gene/2597), [UBC](/details-gene/7316), [FTL](/details-gene/2512)) suggests that the defining feature of this cell is not its basal metabolic activity—which is expectedly high in all cardiac cells—but rather its highly specialized structural and signaling proteome. ## Clinical Significance and Contextual Roles **Overall**, the gene expression profile of the [cardiac neuron](/details-cell/CL0010022) points toward potential roles in both cardiac development and adult pathophysiology. The specific expression of numerous neuronal adhesion and guidance molecules ([NRXN3](/details-gene/9369), [CHL1](/details-gene/10752), [CNTN1](/details-gene/1272)) suggests that disruptions in their function could lead to congenital abnormalities in cardiac innervation, potentially contributing to arrhythmias or other electrophysiological disorders. The specific expression of [NRXN3](/details-gene/9369) in the heart further reinforces its potential importance in cardiac-specific functions ([Link](https://doi.org/10.1016/s0006-291x(02)02403-8)). The most compelling clinical link is the high specificity of [MYH7](/details-gene/4625). Mutations in [MYH7](/details-gene/4625) are a primary cause of hypertrophic cardiomyopathy. Its specific expression within cardiac neurons raises the intriguing possibility that these neurons are involved in the pathogenesis of this disease, either by directly contributing to the pathology through expression of a mutant protein or by being involved in sensing and responding to the altered mechanical stress of diseased cardiomyocytes. This represents a novel, neuron-centric perspective on a classic myocardial disease. Similarly, the glutamate receptor [GRIA1](/details-gene/2890) is implicated in synaptic plasticity and excitotoxicity in the central nervous system. Its specific expression in cardiac neurons suggests that similar mechanisms could be at play in the heart, where dysregulation of glutamatergic signaling might contribute to arrhythmogenesis or ischemic damage. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Cardiac neurons form unique, physically integrated neuro-myocardial junctions that utilize both canonical synaptic adhesion proteins and non-canonical muscle-associated proteins to directly sense and modulate cardiomyocyte function. * **Surprising Findings:** The high `csi_z` score for [MYH7](/details-gene/4625) and [TCAP](/details-gene/8557), cornerstone proteins of the muscle sarcomere, in a neuronal cell type is highly unexpected. This suggests either a novel function for these proteins in neurons or an unprecedented level of structural integration between the nerve terminal and the cardiomyocyte. * **Testable Questions:** Does the [MYH7](/details-gene/4625) protein co-localize with pre-synaptic markers like [NRXN3](/details-gene/9369) at the interface of cardiac neurons and ventricular myocytes using high-resolution microscopy? Can targeted inactivation of [MYH7](/details-gene/4625) in cardiac neurons *in vivo* (using a neuron-specific Cre driver) lead to detectable changes in heart rate variability or contractility under physiological stress? 2. **Hypothesis:** The precise wiring and functional diversity of the intracardiac nervous system are governed by a combinatorial "adhesion code," where specific sets of cell surface molecules ([ADGRB3](/details-gene/577), [CDH19](/details-gene/28513), [CADM2](/details-gene/253559)) dictate connectivity and integrate mechanical or humoral signals via GPCR-mediated pathways. * **Surprising Findings:** The sheer number and high specificity of diverse adhesion molecules as top markers suggest a level of synaptic specificity and complexity within the heart's intrinsic nervous system that may be far greater than currently appreciated. The prominence of adhesion GPCRs like [ADGRB3](/details-gene/577) indicates a direct link between physical cell-cell contact and intracellular signaling that could mediate cardiac mechano-electrical feedback. * **Testable Questions:** Using an *in vitro* co-culture system with iPSC-derived cardiac neurons and cardiomyocytes, does shRNA-mediated knockdown of [ADGRB3](/details-gene/577) or [CDH19](/details-gene/28513) alter the formation of functional synapses, as measured by calcium transient synchronization or electrophysiology?