Details for: CL0000752

Cell ID: CL0000752

Cell Name: cone retinal bipolar cell

Description: A bipolar neuron found in the retina and having connections with cone photoreceptor cells and neurons in the inner plexiform layer.

Selected Context(s): Overall

Gene Significance Landscape

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Genes

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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 cone retinal bipolar 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 cone retinal bipolar 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 cone retinal bipolar 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 cone retinal bipolar 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:  cone retinal bipolar cell (CL0000752)

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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 [cone retinal bipolar cell](/details-cell/CL0000752) is a specialized bipolar neuron that serves as a critical intermediary in the visual pathway, relaying signals from cone photoreceptor cells to neurons in the inner plexiform layer. Gene significance analysis reveals that this cell type is overwhelmingly defined by an exceptionally high and specific expression of mitochondrially-encoded genes. This molecular signature strongly suggests that the primary characteristic of the [cone retinal bipolar cell](/details-cell/CL0000752) is its immense metabolic activity and reliance on aerobic respiration, likely to support the continuous and energy-demanding process of neurotransmission required for photopic (daylight) vision. ## Key Characteristics and Function The gene expression profile of the [cone retinal bipolar cell](/details-cell/CL0000752) is dominated by genes essential for cellular energy production. * **Mitochondrial Bioenergetics:** **Overall**, the most specific markers for this cell type are core components of the mitochondrial electron transport chain. Genes such as [ATP6](/details-gene/4508) (CSI: 7.75), [ND5](/details-gene/4540) (CSI: 7.66), [ND4](/details-gene/4538) (CSI: 7.62), [CYTB](/details-gene/4519) (CSI: 7.41), [ND2](/details-gene/4536) (CSI: 7.18), [ND1](/details-gene/4535) (CSI: 7.09), [COX1](/details-gene/4512) (CSI: 7.03), and [COX2](/details-gene/4513) (CSI: 6.51) all exhibit exceptionally high `csi_z` scores. This indicates their expression is uniquely pronounced in these cells compared to others, establishing a state of high metabolic demand as the central feature of this cell's identity. This is consistent with the need to maintain ionic gradients and support continuous synaptic activity in response to light stimulation. * **Calcium Signaling and Cellular Regulation:** Beyond energy metabolism, high specificity scores for calmodulin genes [CALM1](/details-gene/801) (CSI: 6.18) and [CALM2](/details-gene/805) (CSI: 5.71) underscore the importance of calcium-dependent signaling pathways. In neurons, calmodulin is a critical transducer of calcium signals that regulate neurotransmitter release, ion channel activity, and gene expression, all vital functions for a bipolar cell. * **Neuronal Structure and Protein Processing:** The specific expression of [RTN4](/details-gene/57142) (CSI: 5.78), which encodes the Nogo protein known for its role in inhibiting neurite outgrowth, may suggest a role in maintaining the precise and stable synaptic architecture within the retinal layers. Additionally, the high significance of [ITM2B](/details-gene/9445) (CSI: 5.84), a gene involved in protein processing and linked to amyloid diseases ([Link](https://doi.org/10.1038/21637)), points towards active protein turnover and a potential susceptibility to protein misfolding pathologies. The anti-marker profile is less distinct, but the low specificity score for [VSX2](/details-gene/338917) (CSI: 0.53), a homeobox gene critical for bipolar cell development ([Link](https://doi.org/10.1038/78071)), is notable. This suggests that while [VSX2](/details-gene/338917) is essential for the cell's formation, its expression may not be unique to this specific subtype compared to other developing or mature retinal neurons, thus lowering its specificity-based significance score. Similarly, the low score for [PRCD](/details-gene/768206) (CSI: 0.55), a gene linked to retinitis pigmentosa ([Link](https://doi.org/10.1016/j.ygeno.2006.07.007)), indicates its expression is not a defining characteristic that distinguishes cone bipolar cells from their neighbors. ## Clinical Significance and Contextual Roles The gene signature of the [cone retinal bipolar cell](/details-cell/CL0000752) highlights its potential vulnerabilities in disease. The profound dependence on mitochondrial function suggests these cells may be particularly susceptible to damage from metabolic stress, mitochondrial toxins, or genetic defects affecting the oxidative phosphorylation system. Such dysfunction is a known contributor to a variety of neurodegenerative disorders, and this intrinsic metabolic characteristic could position the [cone retinal bipolar cell](/details-cell/CL0000752) as an early site of pathology in metabolic or age-related retinal diseases. Furthermore, the high significance of [ITM2B](/details-gene/9445) is of considerable clinical interest. Mutations in this gene cause familial British dementia, a cerebral amyloidosis, by producing a pathogenic peptide fragment ([Link](https://doi.org/10.1038/21637)). The specific expression of [ITM2B](/details-gene/9445) in cone bipolar cells suggests a potential shared molecular pathway between neurodegeneration in the brain and retinal pathology. This raises the possibility that these cells could be involved in retinal manifestations of systemic proteinopathies or that they are intrinsically vulnerable to protein aggregation stress. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The extreme specificity of mitochondrial gene expression establishes the [cone retinal bipolar cell](/details-cell/CL0000752) as a metabolic hotspot exceptionally vulnerable to oxidative stress and mitochondrial dysfunction, which may represent an early, upstream event in the pathogenesis of certain retinopathies. * **Surprising Findings:** The most specific molecular markers are not directly related to synaptic transmission or phototransduction, but rather to the foundational process of ATP synthesis. This implies that cellular energy status, more than any other single function, is the most defining and potentially limiting factor for this cell's role in vision. The low specificity score for the key developmental transcription factor [VSX2](/details-gene/338917) is also unexpected, suggesting its role is shared across multiple bipolar cell types rather than being a unique identifier for this population. * **Testable Questions:** How does experimentally induced mitochondrial stress (e.g., using low-dose rotenone or other electron transport chain inhibitors) specifically affect the synaptic transmission, glutamate release, and structural integrity of [cone retinal bipolar cells](/details-cell/CL0000752) in retinal organoids or ex vivo retinal preparations? 2. **Hypothesis:** The high and specific expression of [ITM2B](/details-gene/9445), a gene implicated in cerebral amyloidosis, suggests that [cone retinal bipolar cells](/details-cell/CL0000752) are uniquely susceptible to protein aggregation pathologies, potentially contributing to retinal phenotypes observed in systemic neurodegenerative diseases or acting as a locus of primary proteinopathy within the retina itself. * **Surprising Findings:** The identification of a high-specificity marker for a rare, hereditary cerebral dementia within a specific retinal neuron is a striking finding. It suggests a shared molecular vulnerability between distinct neuronal populations in the brain and retina, which is not widely appreciated for [ITM2B](/details-gene/9445)-related diseases. * **Testable Questions:** Can protein aggregates containing ITM2B or its pathogenic fragments be detected in the inner nuclear or inner plexiform layers of retinal tissue from patients with familial British dementia or other retinal degenerative diseases, and does this accumulation correlate with deficits in the cone-mediated electroretinogram (ERG) signal?