Details for: CL4023011

Cell ID: CL4023011

Cell Name: lamp5 GABAergic cortical interneuron

Description: A transcriptomically distinct GABAergic neuron located in the cerebral cortex that expresses Lamp5.

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 lamp5 GABAergic cortical interneuron 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 lamp5 GABAergic cortical interneuron. 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 lamp5 GABAergic cortical interneuron. 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 lamp5 GABAergic cortical interneuron. 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:  lamp5 GABAergic cortical interneuron (CL4023011)

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Edges (Interactions):
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## Summary The [lamp5 GABAergic cortical interneuron](/details-cell/CL4023011) is a distinct inhibitory neuron of the cerebral cortex characterized by a highly specialized transcriptional profile. Based on its top specificity markers (**Overall** context), this cell's identity is shaped by a sophisticated interplay between synaptic signaling and post-transcriptional gene regulation. Its molecular signature is dominated by a rich repertoire of genes involved in GABAergic and glutamatergic neurotransmission, such as [GAD2](/details-gene/2572), [GABBR2](/details-gene/9568), and [GRM5](/details-gene/2915), alongside a prominent set of RNA binding and splicing factors like [DDX17](/details-gene/10521) and [PNISR](/details-gene/25957). This suggests its function within cortical circuits is finely tuned through extensive RNA processing, likely to generate a diverse array of proteins required for precise synaptic communication and plasticity. ## Key Characteristics and Function The gene significance profile of the [lamp5 GABAergic cortical interneuron](/details-cell/CL4023011) points to several core functional axes. * **Complex Synaptic Integration and Regulation:** The cell's identity as an inhibitory neuron is unequivocally confirmed by the high specificity of [GAD2](/details-gene/2572), the enzyme responsible for GABA synthesis. Furthermore, it expresses specific GABA receptor subunits, including [GABBR2](/details-gene/9568) and [GABRB2](/details-gene/2561), suggesting a capacity for autocrine or paracrine self-regulation. Crucially, this interneuron is also a major recipient of excitatory signals, evidenced by the high significance of glutamate receptors like the metabotropic receptor [GRM5](/details-gene/2915) and the ionotropic NMDA receptor subunit [GRIN2A](/details-gene/2903). This molecular toolkit enables the cell to integrate diverse inputs and modulate cortical activity. Its function is further supported by genes involved in synaptic vesicle cycling ([SYN2](/details-gene/6854)) and synaptic adhesion ([CNTNAP4](/details-gene/85445), [KIRREL3](/details-gene/84623)), underscoring its role in establishing and maintaining specific circuit connections. Notably, the high specificity of [RTN4](/details-gene/57142), an inhibitor of neurite outgrowth, may indicate a role in stabilizing mature circuits by preventing aberrant axonal sprouting. * **Specialized Post-Transcriptional Control:** A striking feature of this neuron is its enrichment for genes involved in RNA metabolism. The high `csi_z` scores for the RNA helicases [DDX17](/details-gene/10521) and [DDX5](/details-gene/1655), as well as splicing-related factors like [PNISR](/details-gene/25957) and [RBM39](/details-gene/9584), suggest that alternative splicing and other forms of post-transcriptional regulation are central to its biology. This elaborate RNA processing machinery may be required to generate the specific protein isoforms necessary for its unique synaptic properties and functional diversity. * **Distinct Metabolic and Immune Profile:** The anti-markers provide critical insight into what this cell is not. There is a strong negative signature for numerous genes encoding core components of the mitochondrial respiratory chain, including subunits of cytochrome c oxidase ([COX6C](/details-gene/1345), [COX7C](/details-gene/1350)) and ATP synthase ([ATP5MC2](/details-gene/517), [ATP6](/details-gene/4508)). This pattern suggests a unique metabolic phenotype with a potentially lower reliance on oxidative phosphorylation compared to other cell types. Additionally, the low significance of [B2M](/details-gene/567), a key component of the MHC class I molecule, is consistent with the immune-privileged status of neurons, indicating a lack of conventional antigen presentation machinery. ## Clinical Significance and Contextual Roles While this analysis is based on an **Overall** context, the specific gene signature of the [lamp5 GABAergic cortical interneuron](/details-cell/CL4023011) implicates it in various neurological and psychiatric conditions. The prominent expression of genes directly linked to human channelopathies and synaptopathies highlights its potential clinical relevance. For instance, mutations in [GRIN2A](/details-gene/2903) are associated with epilepsy and neurodevelopmental disorders, while [GRM5](/details-gene/2915) is a therapeutic target in conditions like Fragile X syndrome and anxiety. The GABA receptor subunit [GABRB2](/details-gene/2561) has been genetically linked to schizophrenia. Disruption in the function or regulation of this specific interneuron subtype could therefore contribute to an imbalance of cortical excitation and inhibition, a central feature of these disorders. Furthermore, the cell's reliance on a specialized suite of RNA-binding proteins, including [DDX5](/details-gene/1655) and [DDX17](/details-gene/10521), may represent a specific vulnerability. Dysregulation of RNA metabolism is an emerging hallmark of several neurodegenerative diseases, and the unique post-transcriptional landscape of this neuron could be a critical factor in its susceptibility or resilience to such pathologies. The expression of [RTN4](/details-gene/57142) (Nogo-A) is also clinically significant, as this protein is a well-known inhibitor of axonal regeneration after central nervous system injury, as documented in several studies ([Link](https://doi.org/10.1038/35000287)). Its specific expression in this interneuron suggests a role in maintaining circuit stability in the healthy brain that may become a barrier to recovery after injury. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The functional identity of the [lamp5 GABAergic cortical interneuron](/details-cell/CL4023011) is sculpted by a sophisticated post-transcriptional program, driven by specific RNA helicases like [DDX17](/details-gene/10521) and splicing factors such as [RBM39](/details-gene/9584). This regulatory layer is proposed to generate a unique repertoire of synaptic protein isoforms, particularly for glutamate and GABA receptors ([GRIN2A](/details-gene/2903), [GABRB2](/details-gene/2561)), which dictates the cell's precise integration into and response within cortical microcircuits. * **Surprising Findings:** The dominance of highly specific RNA processing factors over general transcription factors in the marker list is unexpected. It suggests that this cell's identity is refined more at the level of RNA splicing and stability than at the initial act of transcription. * **Testable Questions:** Does selective knockout of [DDX17](/details-gene/10521) within [lamp5 GABAergic cortical interneurons](/details-cell/CL4023011) lead to detectable changes in the splicing patterns of key synaptic genes and result in altered electrophysiological properties, such as altered response to glutamatergic agonists? 2. **Hypothesis:** The [lamp5 GABAergic cortical interneuron](/details-cell/CL4023011) operates with a distinct metabolic profile characterized by a comparatively low reliance on oxidative phosphorylation, as suggested by the strong negative enrichment of multiple core mitochondrial respiratory chain genes ([COX3](/details-gene/4514), [ATP6](/details-gene/4508), [ND3](/details-gene/4537)). This specialized metabolic state may be intrinsically linked to its specific firing patterns and could define its unique vulnerability or resilience to metabolic insults associated with neurodegenerative diseases or ischemic injury. * **Surprising Findings:** A strong negative signature for core oxidative phosphorylation machinery is counterintuitive for a neuron, which is typically a high-energy-demand cell. This finding strongly suggests a preferential use of other energy pathways, such as aerobic glycolysis. * **Testable Questions:** Using single-cell metabolic assays or Seahorse analysis on isolated [lamp5 GABAergic cortical interneurons](/details-cell/CL4023011), can it be confirmed that they exhibit a lower oxygen consumption rate and a higher extracellular acidification rate compared to other cortical neuron populations?