Details for: CL0002343

Cell ID: CL0002343

Cell Name: decidual natural killer cell, human

Description: A natural killer cell subset that is found in the decidual of the uterus and is CD56-high, Galectin-1-positive and CD16-negative. This cell type represents the most abundant immune cell type in the decidual during the first trimester of pregnancy.

Synonyms: dNK cell, decidual NK 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 decidual natural killer cell, human 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 decidual natural killer cell, human. 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 decidual natural killer cell, human. 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 decidual natural killer cell, human. 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:  decidual natural killer cell, human (CL0002343)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 High
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 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 [decidual natural killer cell, human](/details-cell/CL0002343), is a specialized subset of [natural killer cells](/details-cell/CL0000623) that represents the most abundant leukocyte population in the uterine decidua during the first trimester of pregnancy. As defined, these cells are CD56-high, Galectin-1-positive, and CD16-negative. Analysis of its gene significance profile reveals a unique cellular identity characterized by both a potent innate immune signature and remarkably high expression specificity of genes related to cytoskeletal remodeling and metabolism. Key marker genes such as [GNLY](/details-gene/10578), [GZMA](/details-gene/3001), and [IL2RB](/details-gene/3560) confirm its NK lineage, while the prominence of actin-binding proteins like [COTL1](/details-gene/23406) and [CFL1](/details-gene/1072) suggests that cellular motility and physical interaction are central to its function at the maternal-fetal interface. ## Key Characteristics and Function The gene expression landscape of decidual NK cells points to a cell poised for potent effector functions, metabolic activity, and physical tissue interaction. **Overall**, the top marker genes can be grouped into distinct functional clusters that define this cell's specialized role. * **Innate Cytotoxic and Receptor Machinery:** The cell's identity as a [natural killer cell](/details-cell/CL0000623) is unequivocally established by the high expression specificity of cytotoxic granule proteins [GNLY](/details-gene/10578) (Granulysin) and [GZMA](/details-gene/3001) (Granzyme A). This is complemented by a robust signaling and receptor profile, including high specificity for [IL2RB](/details-gene/3560) (a component of the IL-2 and IL-15 receptors critical for NK cell survival), the inhibitory C-type lectin receptor [KLRC1](/details-gene/3821) (NKG2A), and the activating signal adapter [TYROBP](/details-gene/7305) (DAP12). This molecular toolkit enables dNK cells to perform immune surveillance and respond to a variety of activating and inhibitory signals, a crucial function for tolerating the semi-allogeneic fetus while defending against pathogens. * **High Metabolic and Biosynthetic Activity:** A significant number of top markers are involved in core metabolic and biosynthetic processes. High specificity scores for components of the electron transport chain, such as [ATP5F1E](/details-gene/514), [COX7C](/details-gene/1350), and [COX4I1](/details-gene/1327), indicate a high rate of oxidative phosphorylation. This high energy output is likely required to support the synthesis and secretion of effector molecules, as suggested by the prominence of genes involved in RNA processing ([PABPC1](/details-gene/26986)) and protein stability ([UBB](/details-gene/7314)). Furthermore, the specific high expression of ferritin light and heavy chain genes, [FTL](/details-gene/2512) and [FTH1](/details-gene/2495), suggests a specialized role in iron homeostasis within the iron-demanding environment of the decidua. * **Cytoskeletal Plasticity and Motility:** Genes associated with the actin cytoskeleton, including [COTL1](/details-gene/23406) (Coactosin Like 1) and [CFL1](/details-gene/1072) (Cofilin 1), are among the most specific markers. This strongly suggests that cell motility, invasion into the decidual stroma, and dynamic morphological changes are defining features of these cells. This is essential for their proposed roles in migrating towards and physically remodeling uterine spiral arteries. * **Defining Anti-Markers:** The lack of expression specificity for several genes provides crucial insight into what these cells are not. The strong negative CSI for [SOD1](/details-gene/6647) (Superoxide Dismutase 1) is particularly striking, suggesting that dNK cells may have a unique redox state or rely less on reactive oxygen species for their effector functions compared to other immune cells. This may be an adaptive mechanism to limit oxidative damage at the sensitive maternal-fetal interface. ## Clinical Significance and Contextual Roles The unique localization and gene profile of [decidual natural killer cells](/details-cell/CL0002343) place them at the center of successful placentation and pregnancy. Their functions appear to be repurposed from classical cytotoxicity towards tissue remodeling and immunoregulation. The presence of the inhibitory receptor [KLRC1](/details-gene/3821) (NKG2A) is critical for maternal-fetal tolerance, as it recognizes the non-classical MHC molecule HLA-E expressed by fetal trophoblast cells, delivering a dominant inhibitory signal that prevents an attack on the fetus ([Link](https://pubmed.ncbi.nlm.nih.gov/8753859/)). Concurrently, the cytotoxic machinery, including [GNLY](/details-gene/10578) and [GZMA](/details-gene/3001), is thought to be co-opted to induce apoptosis in the vascular smooth muscle cells of uterine spiral arteries. This process, supported by the cell's high motility (indicated by [COTL1](/details-gene/23406) and [CFL1](/details-gene/1072)), is essential for remodeling these arteries into high-conductance vessels capable of supplying adequate blood flow to the growing placenta. Dysregulation of this process is associated with pregnancy complications such as pre-eclampsia and intrauterine growth restriction. The high metabolic rate suggested by the data is consistent with the known function of dNK cells as producers of a wide array of cytokines and pro-angiogenic factors that further support implantation and placentation. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The high expression specificity of actin-remodeling genes like [COTL1](/details-gene/23406) and [CFL1](/details-gene/1072) reflects a primary role for dNK cells as tissue-remodeling agents, where their mechanical and invasive properties are as critical as their secretome. We propose that this pronounced cytoskeletal dynamism is specifically required for the invasion of the decidual stroma and direct interaction with vascular cells to mediate spiral artery modification. * **Surprising Findings:** The specificity scores for these general cytoskeletal regulators are higher than those for some classical immune molecules, suggesting that this physical function is a uniquely defining aspect of the dNK cell identity, distinguishing it from its circulating counterparts. * **Testable Questions:** Does the targeted inhibition of [CFL1](/details-gene/1072) in an *in vitro* co-culture model of dNK cells and endothelial or smooth muscle cells impair the dNK-mediated disruption of vascular networks or induction of apoptosis? 2. **Hypothesis:** The strong negative CSI for the antioxidant enzyme [SOD1](/details-gene/6647) is an essential adaptation to the uterine microenvironment. We propose that dNK cells actively suppress this pathway to minimize the generation of potentially harmful reactive oxygen species (ROS), thereby protecting sensitive fetal and placental tissues from oxidative stress, while relying on granule- and cytokine-mediated effector functions. * **Surprising Findings:** A key cellular enzyme responsible for mitigating oxidative stress is one of the most significant negative markers for a highly metabolically active immune cell residing in a complex tissue environment. * **Testable Questions:** How do intracellular ROS levels in dNK cells compare to those in peripheral blood NK cells following stimulation with target cells or cytokines, and does experimental overexpression of [SOD1](/details-gene/6647) in dNK cells alter their ability to secrete angiogenic factors or mediate spiral artery remodeling *in vitro*?