Details for: CL4033030

Cell ID: CL4033030

Cell Name: diffuse bipolar 3b cell

Description: An OFF calbindin-negative bipolar cell that has a large dendritic field and stratifies narrowly close to the middle of the inner plexiform layer. Its axon terminal is characterized by regularly branching and varicose processes resembling beads on a string. Most of DB3b contacts with cones are non-triad-associated.

Synonyms: DB3b cell

Selected Context(s): Overall

Gene Significance Landscape

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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 diffuse bipolar 3b 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 diffuse bipolar 3b 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 diffuse bipolar 3b 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 diffuse bipolar 3b 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.

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Target Cell for CSI:  diffuse bipolar 3b cell (CL4033030)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 N/A or Not Sig.
Edges (Interactions):
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## Summary The [diffuse bipolar 3b cell](/details-cell/CL4033030) is a specialized OFF bipolar neuron within the retina, characterized by its calbindin-negative status, a large dendritic field that stratifies near the middle of the inner plexiform layer, and distinctive "beads on a string" axon terminals. **Overall**, gene significance analysis reveals that this cell's identity is defined by a highly specific transcriptional and epigenetic regulatory program, with top markers including the chromatin modifier [KMT2E](/details-gene/55904) and the splicing regulator [SRRM4](/details-gene/84530). This foundational identity is complemented by a unique repertoire of genes crucial for synaptic signaling and structural maintenance, such as the ion channel [HCN1](/details-gene/348980) and the GABA receptor subunit [GABBR2](/details-gene/9568), which together orchestrate its precise role in visual signal processing. ## Key Characteristics and Function The gene expression profile of the [diffuse bipolar 3b cell](/details-cell/CL4033030), as defined by high Z-score based Cell Significance Index (CSI), points to several core functional clusters that establish its unique identity. * **Transcriptional and Epigenetic Identity:** A prominent feature of this cell is the highly specific expression of numerous genes involved in chromatin organization and transcription. Top markers include [KMT2E](/details-gene/55904) (CSI: 14.84), a Trithorax-group protein involved in histone methylation, as well as [ARID1B](/details-gene/57492) (CSI: 12.05) and [KANSL1](/details-gene/284058) (CSI: 11.66), which are components of chromatin remodeling and histone acetyltransferase complexes, respectively. The high specificity of the transcription factor [ZNF292](/details-gene/23036) (CSI: 12.69) and the long non-coding RNA [XIST](/details-gene/7503) (CSI: 14.50) further suggests that a tightly controlled, unique regulatory landscape underpins the cell's distinct phenotype. * **Synaptic Signaling and Neuronal Excitability:** The cell expresses a specific suite of genes essential for neuronal communication. The high CSI for [HCN1](/details-gene/348980) (CSI: 12.24), a hyperpolarization-activated "pacemaker" channel, suggests a key role in regulating membrane potential and signal integration ([Link](https://doi.org/10.1016/s0092-8674(00)81434-8)). As an OFF bipolar cell, it is expected to respond to inhibitory signals, a role strongly supported by the specific expression of [GABBR2](/details-gene/9568) (CSI: 11.87), a subunit of the metabotropic GABA-B receptor. Further, the expression of [RIMS1](/details-gene/22999) (CSI: 10.05), a presynaptic protein that regulates vesicle release, and ion channels like [KCNMA1](/details-gene/3778) (CSI: 9.93) points to its active role in transmitting signals within the retinal circuitry. * **Cell Adhesion and Axonal Architecture:** The precise stratification and connectivity of the [diffuse bipolar 3b cell](/details-cell/CL4033030) appears to be governed by a unique set of cell surface molecules. A large cluster of highly specific genes, including [CSMD3](/details-gene/114788) (CSI: 10.78), [NRXN3](/details-gene/9369) (CSI: 10.68), [MDGA2](/details-gene/161357) (CSI: 10.39), [CNTN1](/details-gene/1272) (CSI: 9.84), and [CSMD2](/details-gene/114784) (CSI: 9.82), are implicated in cell adhesion and nervous system development. The high specificity of [RTN4](/details-gene/57142) (CSI: 11.38), a potent inhibitor of neurite outgrowth, may indicate a mechanism for maintaining its defined axonal and dendritic boundaries. * **RNA Processing:** The specific expression of [SRRM4](/details-gene/84530) (CSI: 13.02) and [DDX17](/details-gene/10521) (CSI: 11.03), both key regulators of alternative mRNA splicing, highlights the importance of post-transcriptional modification in generating the specialized proteome required for this cell's function. * **Anti-Markers:** Consistent with their ubiquitous nature, genes encoding core metabolic machinery, particularly those for mitochondrial electron transport ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), [ND5](/details-gene/4540), [COX1](/details-gene/4512), [COX3](/details-gene/4514)) and ATP synthesis ([ATP5F1E](/details-gene/514)), exhibit strongly negative CSI values. This confirms that while essential for survival, these housekeeping functions are not what uniquely define the [diffuse bipolar 3b cell](/details-cell/CL4033030) in comparison to other cell types. ## Clinical Significance and Contextual Roles **Overall**, while no direct disease context is provided, the panel of highly specific genes in the [diffuse bipolar 3b cell](/details-cell/CL4033030) provides potential links to human neurological and developmental disorders. Several of the top marker genes are implicated in neurodevelopmental syndromes. For instance, [ARID1B](/details-gene/57492) is a well-established causative gene for Coffin-Siris syndrome, a condition characterized by intellectual disability. Similarly, [NIPBL](/details-gene/25836) (CSI: 10.12) is the primary gene mutated in Cornelia de Lange syndrome, another severe developmental disorder ([Link](https://doi.org/10.1038/ng1363)). [TTC3](/details-gene/7267) (CSI: 14.32) is located within the Down syndrome critical region on chromosome 21 ([Link](https://doi.org/10.1093/dnares/3.1.9)). The highly specific expression of these genes suggests that dysfunction of [diffuse bipolar 3b cells](/details-cell/CL4033030), and potentially other retinal neurons with similar molecular signatures, could contribute to the visual processing deficits sometimes observed in individuals with these conditions. Furthermore, the high specificity of genes involved in synaptic integrity and architecture, such as [NRXN3](/details-gene/9369) and [RIMS1](/details-gene/22999), implies that disruptions in their function within this cell type could lead to subtle or overt retinopathies. The high expression of [RTN4](/details-gene/57142) (Nogo) may also be clinically relevant, as this protein is a major inhibitor of axonal regeneration in the central nervous system, and its role in the context of retinal injury or degenerative diseases warrants further investigation. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The highly specific expression of a suite of chromatin modifiers ([KMT2E](/details-gene/55904), [ARID1B](/details-gene/57492), [KANSL1](/details-gene/284058)) establishes and maintains a unique epigenetic landscape that acts as the master regulator of the [diffuse bipolar 3b cell](/details-cell/CL4033030)'s terminal differentiation, complex morphology, and precise synaptic connectivity within the retinal circuit. * **Surprising Findings:** The dominance of epigenetic and transcriptional regulators as the most specific markers, ranking even higher than many canonical neuronal function genes, is striking. This suggests that the cell's identity is actively maintained at a fundamental level of chromatin architecture, which dictates the downstream expression of its functional machinery. * **Testable Questions:** Does cell-type-specific conditional knockout of [KMT2E](/details-gene/55904) or [ARID1B](/details-gene/57492) in retinal progenitor cells fated to become bipolar cells result in aberrant dendritic field formation, incorrect stratification within the inner plexiform layer, or a failure to form appropriate synapses with cone photoreceptors? 2. **Hypothesis:** The distinct combination of cell adhesion molecules ([CSMD3](/details-gene/114788), [NRXN3](/details-gene/9369), [CNTN1](/details-gene/1272)) and the neurite outgrowth inhibitor [RTN4](/details-gene/57142) functions as a complex molecular "addressing system." This system employs both attractive and repulsive cues to guide the precise lamination of the [diffuse bipolar 3b cell](/details-cell/CL4033030)'s processes and ensure the fidelity of its synaptic partnerships. * **Surprising Findings:** The high specificity of [RTN4](/details-gene/57142) (Nogo), a classic inhibitor of axonal growth, is unexpected for a cell with a large, stable dendritic field. This implies that active boundary enforcement and growth restriction may be as critical to establishing its morphology as positive adhesion mechanisms. * **Testable Questions:** Using in vivo CRISPR-based perturbation in the developing retina, does the targeted disruption of [CSMD3](/details-gene/114788) cause [diffuse bipolar 3b cell](/details-cell/CL4033030) processes to mis-stratify, while disruption of [RTN4](/details-gene/57142) leads to aberrant sprouting or extension beyond their normal laminar boundaries?