Details for: CL0019026

Cell ID: CL0019026

Cell Name: periportal region hepatocyte

Description: Any hepatocyte that is part of the liver lobule periportal region. These cells are primarily involved in oxidative energy metabolism.

Synonyms: periportal hepatocyte

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

Contexts:

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 periportal 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 periportal 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 periportal 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 periportal 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.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  periportal region hepatocyte (CL0019026)

 Legend
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 [periportal region hepatocyte](/details-cell/CL0019026) is a specialized epithelial cell located in the liver lobule, characterized by its primary involvement in oxidative energy metabolism. The gene significance profile for this cell type strongly supports this definition, highlighting a distinct signature of high metabolic activity, detoxification, and synthesis of essential plasma proteins. The most specific marker is the long non-coding RNA [NEAT1](/details-gene/283131), suggesting that post-transcriptional regulation and nuclear organization are paramount in maintaining this cell's unique functional state. Key protein-coding markers include enzymes of the urea cycle ([CPS1](/details-gene/1373)), components of the complement cascade ([C9](/details-gene/735)), and transcription factors such as [ELF3](/details-gene/1999), which collectively define its role as a metabolic and biosynthetic workhorse. ## Key Characteristics and Function Analysis of the top marker genes, based on expression specificity (**Overall** context), reveals several core functional clusters that define the [periportal region hepatocyte](/details-cell/CL0019026). * **Metabolic and Detoxification Hub:** The cell is clearly equipped for major metabolic pathways central to liver function. High specificity for [CPS1](/details-gene/1373) underscores its critical role in the urea cycle for ammonia detoxification. The presence of [HGD](/details-gene/3081) indicates activity in amino acid metabolism, while [BAAT](/details-gene/570) points to its function in bile acid conjugation. Furthermore, the specificity of [PNPLA3](/details-gene/80339) highlights its involvement in lipid metabolism. * **Oxidative Energy Production:** Consistent with its formal description, this hepatocyte subtype shows specific expression of genes involved in aerobic respiration. Notably, cytochrome c oxidase subunits such as [COX6A1](/details-gene/1337) and [COX5B](/details-gene/794) are significant markers, suggesting a high capacity for oxidative phosphorylation to meet the cell's substantial energy demands. * **Biosynthesis of Plasma Proteins:** The data indicate that [periportal region hepatocytes](/details-cell/CL0019026) are a major source of circulating proteins. This is evidenced by the high specificity of genes encoding complement component [C9](/details-gene/735), coagulation factors [F12](/details-gene/2161) and [FGA](/details-gene/2243), and the vitamin D binding protein [GC](/details-gene/2638). This profile establishes the liver's systemic role in hemostasis, innate immunity, and nutrient transport. * **Transcriptional and Structural Identity:** The cell's phenotype appears to be maintained by a specific transcriptional program, with transcription factors [ELF3](/details-gene/1999) and [ONECUT1](/details-gene/3175) serving as defining markers. The top marker, the lncRNA [NEAT1](/details-gene/283131), suggests that nuclear architecture and post-transcriptional gene silencing are crucial for its specialized function. Structurally, the high specificity of [KRT8](/details-gene/3856) is consistent with its identity as a simple epithelial cell. * **Anti-Markers:** The lack of specificity for ubiquitously expressed genes like ubiquitin ([UBC](/details-gene/7316), [UBB](/details-gene/7314)) and beta-2-microglobulin ([B2M](/details-gene/567)) suggests that the cell's identity is defined not by the overexpression of basic cellular machinery or antigen presentation components, but by its portfolio of specialized metabolic and secretory functions. ## Clinical Significance and Contextual Roles The genes that uniquely define the **Overall** functional identity of the [periportal region hepatocyte](/details-cell/CL0019026) are frequently implicated in human disease, underscoring the cell's clinical relevance. * **Inherited Metabolic Disorders:** Deficiencies in key marker enzymes are linked to severe genetic diseases. For instance, mutations in [CPS1](/details-gene/1373) are the cause of carbamoyl phosphate synthetase I deficiency, a life-threatening urea cycle disorder leading to hyperammonemia, as detailed in molecular analyses of the disease ([Link](https://pubmed.ncbi.nlm.nih.gov/1840546/)). Similarly, mutations in [HGD](/details-gene/3081) are the basis for alkaptonuria ([Link](https://pubmed.ncbi.nlm.nih.gov/8782815/)). * **Acquired Liver Disease:** Several top markers are central to common liver pathologies. The gene [PNPLA3](/details-gene/80339) is a well-established risk locus for the development and progression of non-alcoholic fatty liver disease (NAFLD), steatohepatitis, and hepatocellular carcinoma. The transcription factor [ELF3](/details-gene/1999) has also been linked to tumorigenesis in epithelial tissues ([Link](https://pubmed.ncbi.nlm.nih.gov/9129154/)). * **Systemic Homeostasis:** The cell's role in producing coagulation factors like [F12](/details-gene/2161) and complement proteins like [C9](/details-gene/735) means its dysfunction can have far-reaching consequences for hemostasis and innate immunity. This highlights how localized liver health is critical for systemic physiological balance. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The unparalleled specificity of the lncRNA [NEAT1](/details-gene/283131) suggests it functions as a master architectural regulator that establishes and maintains the unique transcriptional environment of the [periportal region hepatocyte](/details-cell/CL0019026). It may achieve this by organizing chromatin into transcriptionally active hubs for zonal-specific metabolic genes or by sequestering regulatory factors within paraspeckles. * **Surprising Findings:** The most defining molecular feature of this highly metabolic cell is not a metabolic enzyme itself, but a non-coding structural component of the nucleus. This implies that the regulation of gene expression architecture is a more specific feature of this cell's identity than the expression of any single workhorse protein. * **Testable Question:** Does liver-specific conditional knockout of [NEAT1](/details-gene/283131) in an animal model result in the delocalization of periportal-specific transcription factors and a subsequent loss of metabolic zonation, leading to impaired urea cycle function and oxidative metabolism? 2. **Hypothesis:** The high specificity of the GABA transporter [SLC6A1](/details-gene/6529) suggests that [periportal region hepatocytes](/details-cell/CL0019026) play an active role in clearing the inhibitory neurotransmitter GABA from portal blood. This may constitute a novel liver-brain communication axis, where hepatocytes modulate systemic neurotransmitter levels, potentially protecting the brain from gut-derived neuroactive substances. * **Surprising Findings:** The expression of a gene classically associated with neuronal function in a hepatocyte is unexpected. It challenges the conventional view of hepatocyte function and suggests a previously unappreciated role in neuro-chemical homeostasis or detoxification. * **Testable Question:** Using primary hepatocyte cultures or liver slices, can we demonstrate Na+/Cl- dependent uptake of radiolabeled GABA that is specific to periportal hepatocytes? Furthermore, how is the expression and function of [SLC6A1](/details-gene/6529) altered in experimental models of hepatic encephalopathy?