Details for: CL0019028

Cell ID: CL0019028

Cell Name: midzonal region hepatocyte

Description: Any hepatocyte that is part of the liver lobule midzonal region. These cells have mixed functionality in comparison with those in the other two regions of the liver lobule.

Synonyms: midzonal hepatocyte

Selected Context(s): Overall

Gene Significance Landscape

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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

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for midzonal region hepatocyte 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 midzonal region hepatocyte. 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 midzonal region hepatocyte. 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 midzonal region hepatocyte. 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.
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Select a context for the target cell.
Target Cell for CSI:  midzonal region hepatocyte (CL0019028)

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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
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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 [midzonal region hepatocyte](/details-cell/CL0019028) is a specialized liver parenchymal cell situated in the intermediate zone of the liver lobule, between the periportal and pericentral regions. As suggested by its anatomical location, this cell exhibits a hybrid or "mixed" functional profile. The gene significance data from the **Overall** context strongly supports this, highlighting a cell identity defined by exceptionally high and specific expression of genes related to mitochondrial energy production, such as [COX6A1](/details-gene/1337), and core hepatic metabolic functions, including the urea cycle via [CPS1](/details-gene/1373). The top marker, the long non-coding RNA [NEAT1](/details-gene/283131), suggests that a unique layer of nuclear organization and post-transcriptional gene regulation is a key feature that defines the identity of this cell type. ## Key Characteristics and Function Analysis of top marker genes, ranked by expression specificity (`csi_z`), reveals several core functional clusters that characterize the [midzonal region hepatocyte](/details-cell/CL0019028). * **Mitochondrial Respiration and Energy Production:** A large proportion of the most specific markers are components of the mitochondrial electron transport chain. This includes nuclear-encoded subunits like [COX6A1](/details-gene/1337), [COX5B](/details-gene/1329), and [COX7C](/details-gene/1350), as well as multiple mitochondrial DNA-encoded subunits such as [ND2](/details-gene/4536), [ND1](/details-gene/4535), [ND3](/details-gene/4537), [ND5](/details-gene/4540), and [CYTB](/details-gene/4519). The high specificity scores for these genes indicate that the level of oxidative phosphorylation activity in midzonal hepatocytes is a defining characteristic, likely fueling their diverse metabolic functions. * **Core Hepatic Metabolism and Synthesis:** The cell identity is strongly reinforced by the specific expression of cornerstone hepatic genes. [CPS1](/details-gene/1373) is a rate-limiting enzyme in the urea cycle, a critical liver function for ammonia detoxification ([Link](https://doi.org/10.1016/0378-1119(91)90336-a)). [HGD](/details-gene/3081), involved in tyrosine metabolism, and [PNPLA3](/details-gene/80339), which plays a role in lipid metabolism, further underscore its central metabolic role. Additionally, high specificity for genes encoding secreted plasma proteins, such as coagulation factor [F12](/details-gene/2161) and complement component [C9](/details-gene/735), highlights its significant synthetic and secretory capacity. * **Transcriptional and Post-Transcriptional Regulation:** The hepatocyte identity is maintained by key transcription factors like [HNF1A](/details-gene/6927), which shows high specificity. Notably, the top-ranked gene, [NEAT1](/details-gene/283131), is a non-coding RNA that forms the structural core of nuclear paraspeckles. This suggests that the unique gene expression program of the midzonal hepatocyte is not only transcriptionally driven but also precisely maintained through post-transcriptional mechanisms involving the spatial organization of the nucleus. * **Structural and Antigen Presentation Roles:** The expression of [KRT8](/details-gene/3856) is consistent with its identity as an epithelial cell, providing structural integrity. The significant specificity of [B2M](/details-gene/567), a component of the MHC class I molecule, suggests that these cells are actively involved in antigen presentation, an important function for immune surveillance within the liver. **Conversely, the anti-marker profile** reveals what this cell is not. The strong negative significance for genes involved in general translation ([EEF1B2](/details-gene/1933)), RNA processing ([HNRNPA1](/details-gene/3178)), and cytoskeletal dynamics ([CFL1](/details-gene/1072)) suggests that, relative to other cell types, the [midzonal region hepatocyte](/details-cell/CL0019028) is a terminally differentiated cell whose identity is defined by specialized metabolic functions rather than ubiquitous housekeeping or proliferative processes. ## Clinical Significance and Contextual Roles While this analysis is based on an **Overall** context without a direct disease comparison, the specific gene signature of the [midzonal region hepatocyte](/details-cell/CL0019028) has significant clinical implications. The high specificity of numerous genes directly linked to metabolic disorders positions this cell population as a potential nexus for liver pathology. * **Inborn Errors of Metabolism:** Mutations in highly specific genes like [CPS1](/details-gene/1373) and [HGD](/details-gene/3081) are known to cause carbamoyl phosphate synthetase I deficiency (a severe hyperammonemia) and alkaptonuria, respectively ([Link](https://doi.org/10.1002/(sici)1098-1004(1998)12:3<206::aid-humu8>3.0.co;2-e), [Link](https://doi.org/10.1038/ng0996-19)). The data suggest that the midzonal hepatocyte is a primary site where the functional consequences of these mutations manifest. * **Diabetes and Liver Disease:** The specific expression of the transcription factor [HNF1A](/details-gene/6927) is clinically relevant, as mutations in this gene are the cause of maturity-onset diabetes of the young (MODY3) ([Link](https://doi.org/10.1038/384455a0)). Furthermore, the high specificity of [PNPLA3](/details-gene/80339), a gene whose variants are strongly associated with the entire spectrum of non-alcoholic fatty liver disease (NAFLD) from steatosis to hepatocellular carcinoma, implies that midzonal hepatocytes may be critically involved in the pathogenesis of this common liver disease. The specific expression of coagulation factor [F12](/details-gene/2161) and complement component [C9](/details-gene/735) also suggests that dysfunction in this cell population could contribute to coagulopathies and dysregulation of the innate immune system. ## Potential Mechanisms and Research Directions Based on the provided data, we can propose several hypotheses regarding the unique biology of the [midzonal region hepatocyte](/details-cell/CL0019028). 1. **Hypothesis:** The unique identity of the [midzonal region hepatocyte](/details-cell/CL0019028) as a "mixed functionality" cell is driven by an exceptionally high and specific level of mitochondrial oxidative phosphorylation. This elevated energy-generating capacity provides the necessary ATP to simultaneously power diverse and often spatially segregated metabolic pathways, such as urea synthesis (typically periportal) and detoxification (typically pericentral). * **Surprising Findings:** It is particularly noteworthy that multiple mitochondrially-encoded genes (e.g., [ND1](/details-gene/4535), [ND2](/details-gene/4536), [CYTB](/details-gene/4519)) rank as highly specific markers. This suggests that the regulation and expression level of the mitochondrial genome itself, not just imported nuclear-encoded proteins, is a distinguishing feature of this cell type compared to others. * **Testable Questions:** Does spatial metabolomics reveal a uniquely high ATP/ADP ratio within the midzonal region of the liver lobule that co-localizes with the expression of these specific mitochondrial markers? Furthermore, how does zone-specific inhibition of Complex I affect the expression of both periportal and pericentral marker genes within these midzonal cells? 2. **Hypothesis:** The top specificity marker, the long non-coding RNA [NEAT1](/details-gene/283131), indicates that the formation of nuclear paraspeckles is a fundamental mechanism for establishing and maintaining the midzonal hepatocyte phenotype. These sub-nuclear bodies likely control the cell's "mixed" identity by sequestering specific mRNAs or regulatory proteins, thereby fine-tuning the expression of zonation-specific gene programs and preventing a complete shift towards either a periportal or pericentral fate. * **Surprising Findings:** The discovery of a structural lncRNA as the most defining feature of this cell, surpassing even classic metabolic enzymes, is unexpected. It shifts the focus from purely metabolic activity to the importance of nuclear architecture and post-transcriptional gene regulation in defining hepatocyte zonation and function. * **Testable Questions:** Using super-resolution microscopy, do [midzonal region hepatocytes](/details-cell/CL0019028) exhibit a unique number, size, or protein/RNA composition of [NEAT1](/details-gene/283131)-dependent paraspeckles compared to their periportal and pericentral neighbors? Does liver-specific knockout of [NEAT1](/details-gene/283131) in a mouse model lead to a disruption of midzonal gene expression and a subsequent impairment of metabolic flexibility?