Details for: CL1001107

Cell ID: CL1001107

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

Description: An epithelial cell that is part of some loop of Henle thin ascending 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 ascending 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 ascending 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 ascending 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 ascending 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 ascending 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 ascending limb epithelial cell (CL1001107)

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Node size also reflects Target Cell CSI magnitude.
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Edges (Interactions):
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## Summary The **Overall** gene significance profile characterizes the [kidney loop of Henle thin ascending limb epithelial cell](/details-cell/CL1001107) as a highly specialized and metabolically active cell type. Its identity is defined by two prominent functional themes: an exceptionally active machinery for RNA processing and splicing, and a robust and specific suite of mitochondrial components for energy production. Top marker genes such as the DEAD-box helicases [DDX17](/details-gene/10521) and [DDX5](/details-gene/1655), alongside the ribonucleoprotein [HNRNPA2B1](/details-gene/3181), suggest that post-transcriptional regulation is a cornerstone of this cell's function. Concurrently, the high significance of mitochondrial genes like [ND3](/details-gene/4537) and [ND5](/details-gene/4540) underscores the immense energy demand required to maintain the kidney's medullary interstitial gradient, a primary role of the loop of Henle. ## Key Characteristics and Function Analysis of top-ranking genes, identified by their high expression specificity (CSI Z-score), reveals several core functional clusters that define this epithelial cell. * **RNA Processing and Regulation:** A dominant characteristic of this cell is its extensive machinery for post-transcriptional gene regulation. The most significant markers include RNA helicases [DDX17](/details-gene/10521) (CSI: 38.61) and [DDX5](/details-gene/1655) (CSI: 16.35), as well as heterogeneous nuclear ribonucleoproteins [HNRNPA2B1](/details-gene/3181) (CSI: 35.09) and [HNRNPU](/details-gene/3192) (CSI: 14.46). These proteins are central to mRNA splicing, processing, and nuclear export. The high specificity of the long non-coding RNA [NEAT1](/details-gene/283131) further points to complex nuclear organization and gene silencing mechanisms. This suggests that precise control of protein isoform expression through alternative splicing is critical for the specialized transport functions of this cell. * **Mitochondrial Energy Production:** The cell exhibits a strong signature of high metabolic activity, consistent with the energy-intensive process of ion transport. Several top markers are key components of the mitochondrial electron transport chain, including the mitochondrially-encoded subunits [ND3](/details-gene/4537) (CSI: 33.34) and [ND5](/details-gene/4540) (CSI: 22.49), and the nuclear-encoded subunits [COX4I1](/details-gene/1327) (CSI: 22.11), [COX7C](/details-gene/1350) (CSI: 18.42), and [NDUFA4](/details-gene/4697) (CSI: 15.01). The high significance of the ATP/ADP antiporter [SLC25A6](/details-gene/293) (CSI: 16.10) and mitochondrial import proteins [CHCHD2](/details-gene/51142) and [TOMM7](/details-gene/54543) further reinforces the central role of oxidative phosphorylation in fueling cellular activities. * **Epithelial Structure and Function:** The cell's identity as a specialized epithelial barrier is highlighted by markers such as [CLDN4](/details-gene/1364) (CSI: 16.70), a core component of tight junctions that regulate paracellular permeability. Furthermore, the high significance of the epithelium-specific Ets transcription factor [ELF3](/details-gene/1999) (CSI: 20.58) likely contributes to maintaining the cell's differentiated phenotype. * **Signaling and Protein Modification:** The profile includes key signaling and regulatory proteins. [YWHAZ](/details-gene/7534) (CSI: 23.34), a 14-3-3 protein, acts as a major hub in various signaling pathways. The adaptor protein [SH3GL3](/details-gene/6457) and the glycosylation enzyme [GALNT9](/details-gene/50614) suggest important roles for protein-protein interactions and post-translational modifications in cellular function. The Anti-Marker profile provides additional insight. The low significance of several mitochondrially-encoded genes ([ND1](/details-gene/4535), [ND4](/details-gene/4538), [COX1](/details-gene/4512)) suggests a highly specific composition of the respiratory chain rather than a uniform upregulation of all mitochondrial components. The low scores for developmental transcription factors like [HOXC6](/details-gene/3223) and [HOXD8](/details-gene/3234), and the proliferation-associated factor [JUN](/details-gene/3725), are consistent with a terminally differentiated, non-proliferative state. ## Clinical Significance and Contextual Roles The gene signature of the [kidney loop of Henle thin ascending limb epithelial cell](/details-cell/CL1001107) highlights its potential involvement in both renal and systemic pathologies. The profound reliance on a specific set of mitochondrial proteins suggests a heightened vulnerability to mitochondrial dysfunction, a key factor in acute kidney injury and chronic kidney disease. The specific pattern of electron transport chain subunit expression may define its susceptibility or resilience to metabolic insults like ischemia-reperfusion injury. Several top marker genes have direct clinical associations. * [ITM2B](/details-gene/9445) is directly implicated in familial British and Danish dementias, where mutations lead to the formation of amyloid peptides ([Link](https://doi.org/10.1038/21637), [Link](https://doi.org/10.1073/pnas.080076097)). Its high specificity in this renal cell type is unexpected and may suggest a yet-unexplored physiological role or a potential renal manifestation in these disorders. * [CLDN4](/details-gene/1364) not only governs epithelial barrier function but also serves as a receptor for the *Clostridium perfringens* enterotoxin, a cause of food poisoning and gas gangrene ([Link](https://doi.org/10.1074/jbc.272.42.26652)). This highlights a potential link between renal epithelial integrity and systemic toxicity. * [GNAS](/details-gene/2778), which encodes the Gs alpha subunit, is crucial for G-protein coupled receptor signaling and has a known role in renal water homeostasis. Dysregulation of [GNAS](/details-gene/2778) is associated with multiple endocrine disorders that can have renal manifestations. The cell's extensive RNA processing machinery, indicated by markers like [DDX17](/details-gene/10521) and [HNRNPA2B1](/details-gene/3181), could be a target for disease processes. Aberrant splicing is increasingly recognized as a driver of various diseases, and dysfunction in this cellular machinery could impair the production of essential transport proteins, leading to electrolyte imbalances and renal failure. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The strong enrichment for RNA helicases and splicing factors ([DDX17](/details-gene/10521), [HNRNPA2B1](/details-gene/3181), [DDX5](/details-gene/1655)) as defining markers suggests that regulated alternative splicing is a primary mechanism used by these cells to generate a highly specialized proteome, including unique isoforms of ion transporters and channels necessary for their distinct physiological role in the renal medulla. * **Surprising Findings:** The dominance of RNA processing factors over classical ion transporters as specificity markers is unexpected. This implies that the regulatory layer controlling protein expression may be more unique to this cell's identity than the effector proteins themselves. * **Testable Questions:** Does deep RNA-sequencing of isolated [kidney loop of Henle thin ascending limb epithelial cells](/details-cell/CL1001107) reveal unique splice variants of key solute carriers (e.g., aquaporins, urea transporters) not present in other nephron segments? Furthermore, does siRNA-mediated knockdown of [DDX17](/details-gene/10521) in a kidney organoid model lead to altered splicing of these transporters and a measurable defect in gradient-forming capacity? 2. **Hypothesis:** The distinct pattern of high and low significance among different mitochondrial respiratory chain subunits indicates the assembly of a specialized, non-canonical mitochondrial proteome. This unique composition may be optimized to maximize ATP production efficiency under the hypoxic and hypertonic conditions of the renal medulla, providing a constant energy supply for active transport while minimizing oxidative stress. * **Surprising Findings:** The data do not simply show a generic "high metabolism" signature. The fact that some core mitochondrial genes ([ND3](/details-gene/4537), [COX4I1](/details-gene/1327)) are highly specific markers while others ([ND1](/details-gene/4535), [COX1](/details-gene/4512)) are not suggests a fine-tuning of the mitochondrial machinery. This challenges the assumption that all respiratory chain components are ubiquitously expressed at similar relative levels. * **Testable Questions:** Using quantitative mass spectrometry, does the stoichiometric ratio of Complex I and Complex IV subunits in mitochondria isolated from the thin ascending limb differ significantly from that of proximal tubule cells? Does this specific subunit composition confer a functional advantage, such as enhanced respiratory capacity or reduced reactive oxygen species production, when cells are cultured under low-oxygen or hyperosmotic stress?