Details for: CL1001285

Cell ID: CL1001285

Cell Name: vasa recta descending limb cell

Description: A cell that is part of some vasa recta descending limb.

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

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Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Image representation

Depiction of vasa recta descending limb cell
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for vasa recta descending limb 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 vasa recta descending limb 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 vasa recta descending limb 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 vasa recta descending limb 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.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  vasa recta descending limb cell (CL1001285)

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Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 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 [vasa recta descending limb cell](/details-cell/CL1001285) is a specialized cell type forming a component of the vasa recta, the capillary networks that supply blood to the renal medulla. Based on its gene significance profile, this cell is characterized by exceptionally high metabolic activity and a prominent role in protein synthesis and immune surveillance. The top marker genes, identified by their highly specific expression (**`csi_z`**), include components of the signal recognition particle like [`SRP14`](/details-gene/6727) and key molecules of the antigen presentation pathway such as [`HLA E`](/details-gene/3133) and [`B2M`](/details-gene/567). This molecular signature suggests a cell that is not only vital for the countercurrent exchange mechanism of the kidney but also actively engages with the local immune environment. ## Key Characteristics and Function **Overall**, the gene expression landscape of the [vasa recta descending limb cell](/details-cell/CL1001285) points to several core functional clusters. * **High Metabolic and Bioenergetic Demand:** A large number of the top markers are mitochondrial genes essential for oxidative phosphorylation, including [`ND4`](/details-gene/4538), [`ND2`](/details-gene/4536), [`COX2`](/details-gene/4513), [`COX1`](/details-gene/4512), and [`ATP5F1E`](/details-gene/514). The specific high expression of these genes, along with the glycolytic enzyme [`GAPDH`](/details-gene/2597), is consistent with the high energy requirements for active transport processes necessary to maintain the hypertonic medullary gradient. * **Robust Protein Synthesis and Quality Control:** The top marker, [`SRP14`](/details-gene/6727), is part of the signal recognition particle that directs proteins to the endoplasmic reticulum, indicating a high rate of protein synthesis and secretion ([Link](https://pubmed.ncbi.nlm.nih.gov/7542942/)). This is complemented by the high significance of ubiquitin genes [`UBC`](/details-gene/7316) and [`UBB`](/details-gene/7314), which are critical for protein degradation and turnover, suggesting a tightly regulated proteome. * **Immune Surveillance and Antigen Presentation:** The striking co-expression of the non-classical MHC class I molecule [`HLA E`](/details-gene/3133) and its essential light chain [`B2M`](/details-gene/567) as top markers suggests a specialized immunological function. HLA-E typically presents a limited set of peptides to inhibitory receptors on NK cells and certain T-cell subsets, potentially playing a role in immune tolerance and surveillance within the unique renal medullary environment ([Link](https://pubmed.ncbi.nlm.nih.gov/10064069/)). * **Cytoskeletal Dynamics:** Significant expression of genes like [`MYL6`](/details-gene/4637), [`CFL1`](/details-gene/1072), and [`MYL12B`](/details-gene/103910) highlights the importance of the actin-myosin cytoskeleton. This machinery likely contributes to maintaining the structural integrity and shape of these endothelial-like cells under the physical stresses of blood flow and high osmolarity. The anti-marker profile helps to further refine the cell's identity. The low significance of canonical endothelial markers involved in angiogenesis ([`TEK`](/details-gene/7010), [`TIE1`](/details-gene/7075)), hemostasis ([`PLAT`](/details-gene/5327), [`SERPINE1`](/details-gene/5054)), and cell-cell communication ([`GJA4`](/details-gene/2701), [`GJA5`](/details-gene/2702)) suggests that these cells are highly specialized and terminally differentiated, with a primary focus on transport rather than vascular remodeling or coagulation. ## Clinical Significance and Contextual Roles Given the lack of multiple contexts in this analysis, clinical interpretations are based on the **Overall** significance profile. The functions of the top marker genes suggest potential involvement in several pathological processes. The high expression of [`ITM2B`](/details-gene/9445) is noteworthy. While its function in the kidney is not well-defined, mutations in this gene are known to cause familial British and Danish dementias through the formation of amyloid peptides ([Link](https://doi.org/10.1038/21637)). Its specific role in [vasa recta descending limb cells](/details-cell/CL1001285) may relate to protein processing in the stressful, hyperosmotic medullary environment, and its dysregulation could potentially contribute to protein aggregation-related renal injury. Furthermore, the prominent immune signature, defined by [`HLA E`](/details-gene/3133), suggests these cells are important players in immune-mediated kidney diseases. Altered HLA-E expression could impact the balance of activation and inhibition of NK cells and T cells, potentially contributing to inflammation in conditions like acute kidney injury or transplant rejection. The high expression of the damage-associated molecular pattern (DAMP) molecule [`HMGB1`](/details-gene/3146) further supports a role in sensing and responding to cellular stress and injury. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The highly specific expression of the non-classical MHC molecule [`HLA E`](/details-gene/3133) serves as a primary mechanism for [vasa recta descending limb cells](/details-cell/CL1001285) to maintain immune homeostasis and protect themselves from NK cell-mediated cytotoxicity in the physiologically stressed environment of the renal medulla. * **Surprising Findings:** It is unexpected that an immune regulatory molecule like [`HLA E`](/details-gene/3133) ranks as a top defining marker for a cell primarily associated with metabolic transport. This implies that immune interaction is a core, rather than a peripheral, function of this cell type. * **Testable Questions:** In an in-vitro model of ischemic or hyperosmotic stress, is the surface expression of [`HLA E`](/details-gene/3133) on human [vasa recta descending limb cells](/details-cell/CL1001285) upregulated, and does this change confer resistance to lysis by primary human NK cells? 2. **Hypothesis:** The distinct anti-marker profile, characterized by the low significance of typical angiogenic and pan-endothelial genes ([`TEK`](/details-gene/7010), [`GJA4`](/details-gene/2701)), indicates that [vasa recta descending limb cells](/details-cell/CL1001285) represent a terminally differentiated endothelial subtype whose identity is maintained by suppression of vascular plasticity programs in favor of specialized metabolic and transport functions. * **Surprising Findings:** For a cell that constitutes a capillary network, the lack of significance for key regulators of vascular function like TIE/TEK receptors is counterintuitive. This suggests its endothelial identity is fundamentally different from that of capillaries in other tissues. * **Testable Questions:** Can the treatment of cultured [vasa recta descending limb cells](/details-cell/CL1001285) with pro-angiogenic factors like VEGF induce the expression of anti-markers such as [`TEK`](/details-gene/7010) and [`GJA4`](/details-gene/2701), and does this induction come at the cost of their specialized metabolic (e.g., oxidative phosphorylation rate) or immune ([`HLA E`](/details-gene/3133) expression) functions?