Details for: CL4033032

Cell ID: CL4033032

Cell Name: diffuse bipolar 6 cell

Description: An ON diffuse bipolar cell that has a large dendritic field and large axon terminals, which show little or no overlap. This cell predominantly connects to narrow thorny ganglion cells.

Synonyms: DB6 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 6 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 6 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 6 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 6 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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Select a context for the target cell.
Target Cell for CSI:  diffuse bipolar 6 cell (CL4033032)

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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):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

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## Summary The [diffuse bipolar 6 cell](/details-cell/CL4033032), also known as the DB6 cell, is a type of ON diffuse bipolar cell within the retina, characterized by a large dendritic field and axon terminals that establish specific connections with narrow thorny ganglion cells. Analysis of its gene significance profile in the **Overall** context reveals a highly specialized molecular identity. The cell is defined by a unique transcriptional signature dominated by genes involved in nervous system development, synaptic organization, and transmembrane signaling. Top markers such as [MDGA2](/details-gene/161357), [NETO1](/details-gene/81832), and [GRM5](/details-gene/2915) underscore its role in establishing precise neural circuits and modulating glutamatergic signal transmission, consistent with its function as a critical intermediary in the visual pathway. ## Key Characteristics and Function The functional profile of the [diffuse bipolar 6 cell](/details-cell/CL4033032) is overwhelmingly defined by proteins that mediate neural connectivity and synaptic function. The high Z-scores for its top markers indicate that these genes are uniquely expressed here compared to other cell types, solidifying the cell's distinct identity. * **Synaptic Architecture and Adhesion:** A prominent functional cluster relates to the establishment and maintenance of synaptic connections. The top markers include [MDGA2](/details-gene/161357) (a cell adhesion molecule involved in nervous system development), [NETO1](/details-gene/81832) (implicated in synaptic plasticity), [NRXN3](/details-gene/9369) (neurexin-3, a key presynaptic cell adhesion molecule), [CDH8](/details-gene/1006) (cadherin 8), and [PTPRD](/details-gene/5789) (a receptor-type tyrosine phosphatase). This molecular toolkit is consistent with the cell's described function of forming highly specific synapses, predominantly with narrow thorny ganglion cells. * **Signal Transduction and Ion Channel Activity:** The cell expresses a specific suite of proteins for processing and transmitting neural signals. [GRM5](/details-gene/2915), a metabotropic glutamate receptor, is a highly significant marker, suggesting that the cell modulates its response to glutamate through G-protein coupled signaling pathways. This is complemented by the high specificity of ion channels like [TRPM1](/details-gene/4308) (a calcium channel crucial in retinal ON bipolar cells) and [KCNMA1](/details-gene/3778) (a large-conductance calcium-activated potassium channel). Together, these components likely fine-tune the cell's excitability and signal output. * **Neurotransmitter Release Machinery:** The specific expression of genes critical for synaptic vesicle dynamics further defines the cell's presynaptic function. Key markers include [SYT1](/details-gene/6857) (Synaptotagmin-1), the primary calcium sensor for fast neurotransmitter release, and [RIMS1](/details-gene/22999), a protein that regulates presynaptic vesicle exocytosis. Their presence underscores the cell's role in the precise, calcium-dependent release of neurotransmitters onto its postsynaptic targets. * **Neuronal Development and Regulation:** Several top markers, such as [DOK6](/details-gene/220164) and [NRG3](/details-gene/10718), are involved in receptor tyrosine kinase signaling pathways that guide neuronal development and axon guidance. This suggests that the cell's specific connectivity is established through these developmental programs. **Conversely**, the anti-marker profile is informative. The strong negative CSI scores for numerous mitochondrially-encoded genes ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [COX1](/details-gene/4512), [COX2](/details-gene/4513), [CYTB](/details-gene/4519)) do not imply an absence of mitochondria, but rather that the expression of these core metabolic genes is not a defining feature of this cell compared to others. This may indicate a highly specialized and potentially efficient metabolic state, distinct from more metabolically demanding cell types. ## Clinical Significance and Contextual Roles As the data is presented in an **Overall** context, dynamic changes in gene significance cannot be assessed. However, the specific functions of the top marker genes link the [diffuse bipolar 6 cell](/details-cell/CL4033032) to several neurological and ophthalmological conditions. The high specificity of [GRM5](/details-gene/2915) is notable, as metabotropic glutamate receptors are significant targets in research on neuropsychiatric disorders. Dysregulation of glutamatergic signaling in the retina could contribute to visual processing abnormalities. Furthermore, [TRPM1](/details-gene/4308) is essential for the function of ON bipolar cells, and its dysfunction is linked to congenital stationary night blindness. The gene [RIMS1](/details-gene/22999) is directly implicated in an autosomal dominant form of cone-rod dystrophy (CORD7) ([Link](https://doi.org/10.1016/s0888-7543(03)00010-7)), a degenerative retinal disease. This strongly suggests that the molecular machinery defining the [diffuse bipolar 6 cell](/details-cell/CL4033032) is critical for retinal health and that defects in these specific genes could manifest as retinal pathologies. Additionally, several transcriptional regulators that are top markers, including [ARID1B](/details-gene/57492) and [KANSL1](/details-gene/284058), are associated with broad neurodevelopmental syndromes. While their specific role in this retinal cell is unknown, it suggests that the developmental program that establishes the DB6 cell identity is part of a larger network of genes critical for proper nervous system formation. ## Potential Mechanisms and Research Directions ### Hypothesis 1 The unique combination of highly specific cell adhesion molecules ([MDGA2](/details-gene/161357), [NETO1](/details-gene/81832), [NRXN3](/details-gene/9369)) and signaling molecules ([NRG3](/details-gene/10718), [PTPRD](/details-gene/5789)) creates a precise molecular "lock-and-key" system that dictates the specific synaptic partnership between the [diffuse bipolar 6 cell](/details-cell/CL4033032) and the narrow thorny ganglion cell. We hypothesize that this molecular code is essential not just for establishing the connection, but also for maintaining its structural and functional integrity, and that disruption of this code could be a root cause of specific visual circuitopathies. * **Surprising Findings:** The sheer diversity of highly specific cell surface and signaling molecules dedicated to what is, morphologically, a single type of synaptic connection is remarkable. This suggests an exquisite level of molecular regulation is required to ensure the fidelity of this specific neural circuit. * **Testable Questions:** Does the targeted knockout or knockdown of [NETO1](/details-gene/81832) specifically within retinal bipolar cells lead to aberrant synapse formation or loss of connectivity with narrow thorny ganglion cells, and can this be correlated with specific deficits in electroretinogram (ERG) or visual-evoked potential (VEP) recordings in a model organism? ### Hypothesis 2 The co-expression of the metabotropic glutamate receptor [GRM5](/details-gene/2915) with specific ion channels like [TRPM1](/details-gene/4308) and [KCNMA1](/details-gene/3778) provides the [diffuse bipolar 6 cell](/details-cell/CL4033032) with a unique capacity for signal modulation. We hypothesize that this cell does not simply relay the "ON" signal but actively shapes its temporal properties. Activation of [GRM5](/details-gene/2915) likely initiates intracellular signaling cascades that modulate channel activity, allowing the cell to filter or integrate visual information over longer timescales than would be possible with ionotropic receptors alone. * **Surprising Findings:** The strong negative enrichment for core mitochondrial electron transport chain components is unexpected for a neuron, which is typically presumed to be highly metabolically active. This suggests that the DB6 cell may have a lower basal metabolic rate or rely on alternative energy pathways, which could be linked to its specific role in slower, modulatory signal processing rather than rapid, high-frequency firing. * **Testable Questions:** Using patch-clamp electrophysiology on isolated [diffuse bipolar 6 cells](/details-cell/CL4033032), how does the application of a [GRM5](/details-gene/2915)-specific agonist alter the cell's response to light stimuli or direct depolarization, and are these effects mediated by changes in [TRPM1](/details-gene/4308) or [KCNMA1](/details-gene/3778) channel conductance?