Details for: CL4033036

Cell ID: CL4033036

Cell Name: OFFx cell

Description: An OFF bipolar cell that is fovea-specific and expresses FEZF1, NXPH1 and NXPH2.

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 OFFx 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 OFFx 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 OFFx 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 OFFx 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:  OFFx cell (CL4033036)

 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 [OFFx cell](/details-cell/CL4033036) is a specialized type of OFF bipolar cell located specifically within the fovea of the retina. **Overall**, its molecular identity is strongly defined by a unique and extensive repertoire of genes involved in neuronal development, cell-cell adhesion, and synaptic signaling, as indicated by the high expression specificity of markers such as [MDGA2](/details-gene/161357), [NETO1](/details-gene/81832), and [PTEN](/details-gene/5728). This distinct transcriptional profile suggests a critical role in establishing the precise and stable neural circuitry required for high-acuity vision. The cell's description highlights co-expression of FEZF1, [NXPH1](/details-gene/30010), and NXPH2, and the high significance score for [NXPH1](/details-gene/30010) (CSI 12.78) in this dataset substantiates its role as a key identifier for this cell type. ## Key Characteristics and Function The functional profile of the [OFFx cell](/details-cell/CL4033036) is dominated by genes essential for establishing and maintaining complex neural architecture and communication. * **Synaptic Architecture and Cell Adhesion:** The cell expresses a remarkable array of proteins involved in neuronal connectivity. The top marker, [MDGA2](/details-gene/161357) (CSI 21.53), is a cell adhesion molecule involved in nervous system development. This is complemented by other highly specific cell adhesion molecules including Neurexin 3 ([NRXN3](/details-gene/9369)), Contactin 1 ([CNTN1](/details-gene/1272)), Contactin associated protein-like 5 ([CNTNAP5](/details-gene/129684)), Neurotrimin ([NTM](/details-gene/50863)), and the receptor protein tyrosine phosphatase [PTPRD](/details-gene/5789). This molecular toolkit suggests the [OFFx cell](/details-cell/CL4033036) is a key organizer of synaptic connections in the fovea, ensuring precise wiring between photoreceptors and retinal ganglion cells. * **Neuronal Signaling and Excitability:** The cell's function in signal transmission is underscored by high specificity for genes like [NETO1](/details-gene/81832), which modulates glutamate receptors, and [SYT1](/details-gene/6857), a critical calcium sensor for synaptic vesicle exocytosis. Furthermore, expression of Neuregulin-3 ([NRG3](/details-gene/10718)) points to a role in glial-neuronal communication and oligodendrocyte survival ([Link](https://doi.org/10.1242/jcs.02799)). Regulation of membrane potential is suggested by the specific expression of potassium channel interacting protein [KCNIP4](/details-gene/80333) and the large-conductance calcium-activated potassium channel subunit [KCNMA1](/details-gene/3778). * **Transcriptional and Post-translational Regulation:** The identity of the [OFFx cell](/details-cell/CL4033036) is maintained by a specific set of transcriptional and chromatin regulators. These include the DNA-binding transcription factor [ZNF292](/details-gene/23036), the histone methyltransferase [KMT2C](/details-gene/58508), and the chromatin remodeling factor [ARID1B](/details-gene/57492). The high significance of the tumor suppressor and phosphatase [PTEN](/details-gene/5728) suggests stringent control over intracellular signaling pathways like PI3K-AKT signaling. * **Defining Anti-Markers:** The cell's specialized nature is further defined by what it lacks relative to other cells. There is a prominent negative signature for genes encoding core components of the mitochondrial respiratory chain, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX3](/details-gene/4514), [CYTB](/details-gene/4519), and multiple NADH dehydrogenase subunits ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), [ND4](/details-gene/4538), [ND5](/details-gene/1234)). This may indicate a unique metabolic profile, possibly with a greater reliance on glycolysis or a distinct mitochondrial isoform composition compared to other retinal neurons. Additionally, negative scores for ubiquitous housekeeping genes involved in RNA processing (e.g., [HNRNPU](/details-gene/3192), [SFPQ](/details-gene/6421)) and protein degradation (e.g., [UBB](/details-gene/7314)) suggest a transcriptional program highly skewed towards its specialized neuronal functions. ## Clinical Significance and Contextual Roles **Overall**, while the data do not provide a direct disease context, the strong expression of genes implicated in neurological and developmental disorders highlights the potential clinical relevance of the [OFFx cell](/details-cell/CL4033036). Dysfunction of this cell type could plausibly contribute to retinopathies that specifically affect central, high-acuity vision. Several of its top marker genes have established links to human disease. For instance, [PTEN](/details-gene/5728) is a well-known tumor suppressor gene mutated in multiple cancers ([Link](https://doi.org/10.1126/science.275.5308.1943)), and its role in a post-mitotic neuron like this may be more related to regulating cell size, metabolism, and synaptic plasticity. Mutations in chromatin modifiers like [KMT2C](/details-gene/58508) and [ARID1B](/details-gene/57492) are associated with complex neurodevelopmental syndromes, suggesting that aberrant development or maintenance of [OFFx cells](/details-cell/CL4033036) could be a feature of such disorders. The gene [TTC3](/details-gene/7267), located in the Down syndrome critical region on chromosome 21, is another highly specific marker ([Link](https://doi.org/10.1093/dnares/3.1.9)). Furthermore, genes involved in synaptic function, such as [NRXN3](/details-gene/9369) and [NRG3](/details-gene/10718), have been linked to susceptibility for neuropsychiatric conditions. Therefore, the unique molecular signature of the [OFFx cell](/details-cell/CL4033036) makes it a potential locus of pathology in both inherited retinal diseases and broader neurodevelopmental disorders impacting vision. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The OFFx cell's identity and function are primarily dictated by a complex combinatorial code of cell adhesion and signaling molecules ([MDGA2](/details-gene/161357), [NETO1](/details-gene/81832), [NRXN3](/details-gene/9369), [CNTN1](/details-gene/1272), [PTPRD](/details-gene/5789)), which collectively establish its highly specific and stable synaptic connections within the foveal microcircuit. This "wiring code" may be more critical to its function than its specific neurotransmitter phenotype. * **Surprising Findings:** The expression of such a broad and diverse suite of cell adhesion molecules with high specificity is remarkable. It suggests that synaptic targeting in the fovea is not governed by a single ligand-receptor pair but by a multi-faceted system ensuring unparalleled precision. * **Testable Questions:** Does conditional knockout of [MDGA2](/details-gene/161357) or [NETO1](/details-gene/81832) specifically within retinal bipolar cells lead to observable defects in the stratification of their axonal terminals in the inner plexiform layer and a corresponding loss of visual acuity in behavioral tests? 2. **Hypothesis:** The strong negative CSI scores for numerous core mitochondrial respiratory chain genes (e.g., [COX1](/details-gene/4512), [ND1](/details-gene/4535), [CYTB](/details-gene/4519)) indicate that the OFFx cell utilizes a distinct, non-canonical metabolic strategy compared to other retinal neurons. This cell may rely more heavily on anaerobic glycolysis or possess a specialized mitochondrial proteome adapted to the specific energetic demands of the 'OFF' visual pathway, which is tonically depolarized in the dark but hyperpolarizes in response to light. * **Surprising Findings:** For a neuron, a cell type typically associated with very high energy requirements, to show a strong negative signature for core mitochondrial components is highly counterintuitive. This finding challenges the assumption of a uniform metabolic strategy across all retinal interneurons and suggests a unique bioenergetic adaptation. * **Testable Questions:** Using in-situ metabolic imaging or Seahorse flux analysis on isolated cells, what are the relative contributions of glycolysis versus oxidative phosphorylation to the ATP budget of [OFFx cells](/details-cell/CL4033036) in both dark-adapted (depolarized) and light-stimulated (hyperpolarized) states?