Details for: CL1001111

Cell ID: CL1001111

Cell Name: kidney loop of Henle thin descending limb epithelial cell

Description: An epithelial cell that is part of some loop of Henle thin descending limb.

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

Image representation

Depiction of kidney loop of Henle thin descending limb epithelial cell
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for kidney loop of Henle thin descending limb epithelial 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 kidney loop of Henle thin descending limb epithelial 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 kidney loop of Henle thin descending limb epithelial 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 kidney loop of Henle thin descending limb epithelial 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:  kidney loop of Henle thin descending limb epithelial cell (CL1001111)

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Nodes (Genes):
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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 [kidney loop of Henle thin descending limb epithelial cell](/details-cell/CL1001111) is a specialized cell type forming part of the nephron's loop of Henle. The gene significance profile for this cell is overwhelmingly dominated by components of the mitochondrial electron transport chain. **Overall**, this suggests that a uniquely high level of aerobic respiration and energy production is a central and defining feature of this cell's identity and function, likely to support the intense metabolic demands required for establishing and maintaining the kidney's corticomedullary osmotic gradient. ## Key Characteristics and Function Analysis of top marker genes, ranked by expression specificity (`csi_z`), reveals a cellular identity built around exceptionally high metabolic activity and specialized epithelial functions. * **Mitochondrial Energy Production:** The most prominent characteristic is the extreme significance of genes encoding subunits of the mitochondrial respiratory chain. This includes multiple components of Complex I (NADH dehydrogenase), such as [ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND5](/details-gene/4540), [ND4](/details-gene/4538), and [ND3](/details-gene/4537), as well as components of Complex III ([CYTB](/details-gene/4519)), Complex IV ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX3](/details-gene/4514), [COX5B](/details-gene/1329)), and Complex V ([ATP6](/details-gene/4508)). The high specificity scores for these genes indicate that this intense reliance on oxidative phosphorylation is a distinguishing feature compared to other cell types. This metabolic machinery is crucial for generating the vast amounts of ATP needed for active transport processes that drive water reabsorption in the kidney. * **Epithelial Identity and Barrier Function:** The cell's epithelial nature is underscored by the high significance of [KRT8](/details-gene/3856), a type-II cytokeratin common in simple epithelia, and [CLDN4](/details-gene/1364), a key component of tight junctions. [CLDN4](/details-gene/1364) is critical for regulating paracellular permeability, a vital function in the selective reabsorption of solutes and water along the nephron. The transcription factor [ELF3](/details-gene/1999), noted for its epithelium-specific expression ([Link](https://doi.org/10.1128/mcb.17.8.4419)), also shows a high specificity score, suggesting it may be a key regulator in maintaining the differentiated state of these cells. * **Transcriptional and Post-Transcriptional Regulation:** A suite of regulatory genes further defines this cell's specialized state. [DDX17](/details-gene/10521), a DEAD box RNA helicase involved in alternative splicing, and [HNRNPC](/details-gene/3183), a core heterogeneous nuclear ribonucleoprotein, suggest active and complex mRNA processing. The high specificity of the long non-coding RNA [NEAT1](/details-gene/283131), a core structural component of paraspeckles, points to a sophisticated level of nuclear organization and gene expression control. * **Ion Transport and Cellular Signaling:** The presence of [KCNIP4](/details-gene/80333), which modulates voltage-gated potassium channels, suggests a role in fine-tuning ion transport. Additionally, genes involved in detoxification ([GSTP1](/details-gene/2950)) and calcium signaling ([S100A6](/details-gene/6277)) highlight the cell's capacity to respond to metabolic stress and intracellular signals. ## Clinical Significance and Contextual Roles The gene signature of the [kidney loop of Henle thin descending limb epithelial cell](/details-cell/CL1001111) points to its potential vulnerabilities and roles in kidney pathophysiology. **Overall**, the profound dependence on mitochondrial function implies that this cell type is likely a primary target in mitochondrial diseases that manifest with renal dysfunction (tubulopathies). Mutations in mitochondrial DNA, such as those affecting the highly significant [CYTB](/details-gene/4519), [ND1](/details-gene/4535), or [ATP6](/details-gene/4508) genes, could severely compromise cellular viability and the kidney's concentrating ability. Indeed, mutations in [CYTB](/details-gene/4519) have been associated with fatal cardiomyopathies ([Link](https://doi.org/10.1007/bf00711378)), underscoring the critical role of mitochondrial integrity in high-energy tissues. The high specificity of [CLDN4](/details-gene/1364) is clinically relevant as claudins are central to the integrity of epithelial barriers. Dysregulation of [CLDN4](/details-gene/1364) can disrupt paracellular transport, a mechanism implicated in various inherited and acquired kidney diseases. Furthermore, its role as a receptor for *Clostridium perfringens* enterotoxin ([Link](https://doi.org/10.1074/jbc.272.42.26652)) highlights a potential, albeit rare, route for toxin-mediated renal injury. The transcription factor [ELF3](/details-gene/1999) and the RNA helicase [DDX17](/details-gene/10521) are implicated in epithelial differentiation and cancer. Their high specificity in these cells suggests that their dysregulation could be an early event in pathological processes such as epithelial-to-mesenchymal transition (EMT), a key driver of renal fibrosis, or the development of renal cell carcinomas. ## Potential Mechanisms and Research Directions 1. **Hypothesis: This cell type is a focal point of metabolic vulnerability in the kidney due to its extreme reliance on oxidative phosphorylation.** * **Surprising Findings:** The degree to which mitochondrial-encoded genes dominate the specificity profile is remarkable. While high metabolic activity is expected in the kidney, the data suggest that the identity of this specific cell segment is more uniquely defined by its mitochondrial expression program than any other function. This implies a potential lack of metabolic flexibility, making it exquisitely sensitive to hypoxia, mitochondrial toxins, or genetic defects in oxidative phosphorylation. * **Testable Questions:** Does exposure to sublethal doses of mitochondrial inhibitors (e.g., rotenone or antimycin A) induce a more rapid and severe loss of function (e.g., impaired water permeability) and cell death in thin descending limb epithelial cells compared to cells from the thick ascending limb or proximal convoluted tubule in ex vivo kidney slice cultures? 2. **Hypothesis: The transcription factor [ELF3](/details-gene/1999) orchestrates a specific gene regulatory network that maintains both the unique metabolic phenotype and the specialized barrier function of these cells.** * **Surprising Findings:** The co-occurrence of a highly specific transcription factor ([ELF3](/details-gene/1999)), a key tight junction protein ([CLDN4](/details-gene/1364)), and a suite of mitochondrial genes as top markers is highly suggestive of a coordinated regulatory program. It is unexpected that a single transcription factor would have such a high specificity score in a terminally differentiated cell, pointing to its role as a continuous and active maintainer of cell identity. * **Testable Questions:** In a suitable in vitro model of these cells, does CRISPR-mediated knockout or siRNA-knockdown of [ELF3](/details-gene/1999) result in a concurrent downregulation of [CLDN4](/details-gene/1364) expression, disruption of tight junction integrity, and a measurable decrease in cellular oxygen consumption rate?