Details for: CL0000232

Cell ID: CL0000232

Cell Name: erythrocyte

Description: A red blood cell. In mammals, mature erythrocytes are biconcave disks containing hemoglobin whose function is to transport oxygen.

Synonyms: RBC, red blood cell

Selected Context(s): Overall

Gene Significance Landscape

Display Options
Score:
Display
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 erythrocyte 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 erythrocyte. 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 erythrocyte. 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 erythrocyte. 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:  erythrocyte (CL0000232)

 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.

Loading network (please wait)...

## Summary The [erythrocyte](/details-cell/CL0000232), or red blood cell (RBC), is an anucleated, biconcave cell primarily responsible for oxygen transport via hemoglobin. The gene significance profile for this cell type strongly underscores its specialized metabolic functions, particularly in iron homeostasis. The high expression specificity of ferritin subunits, [FTL](/details-gene/2512) (CSI-Z: 52.59) and [FTH1](/details-gene/2495) (CSI-Z: 32.95), highlights the central role of iron storage and management in defining this cell's identity. Furthermore, the strong negative significance of numerous mitochondrial and nuclear-specific genes confirms the mature erythrocyte's well-established lack of a nucleus and reliance on non-oxidative metabolism. ## Key Characteristics and Function The gene expression profile of the [erythrocyte](/details-cell/CL0000232) reveals a cell highly specialized for its primary functions while maintaining structural integrity and a stable proteome. The top markers can be grouped into several key functional themes. - **Iron Metabolism and Storage:** The most specific markers are [FTL](/details-gene/2512) and [FTH1](/details-gene/2495), which encode the light and heavy chains of ferritin, the primary intracellular iron-storage protein. This is consistent with the erythrocyte's role as the body's main repository of iron within hemoglobin, essential for oxygen transport. - **Protein Homeostasis and Regulation:** The high specificity of [UBB](/details-gene/7314) (CSI-Z: 47.68), a polyubiquitin precursor, and [OAZ1](/details-gene/4946) (CSI-Z: 51.24), an inhibitor of polyamine synthesis, suggests that protein turnover and the regulation of translation are critical, defining features. These pathways are likely essential for maintaining the cell's proteome over its long lifespan in the absence of new transcription. - **Energy Metabolism:** The presence of transcripts for ATP synthase subunits like [ATP5F1E](/details-gene/514) and [ATP5MG](/details-gene/10632) is notable. While mature erythrocytes lack mitochondria and rely on glycolysis, these transcripts may be stable remnants from their nucleated precursor stages (erythroblasts), where mitochondrial activity is crucial for heme synthesis. - **Unexpected Immune and Signaling Molecules:** A surprising number of top markers are traditionally associated with immune cells. These include the chemokine [CCL5](/details-gene/6352), the cytotoxic molecule [GNLY](/details-gene/10578), and cell surface receptors like [CD2](/details-gene/914) (T-cell), [CD79A](/details-gene/973) (B-cell), and [KLRB1](/details-gene/3820) (NK-cell). The specific expression of these transcripts suggests a potentially unrecognized role for erythrocytes in immune surveillance or modulation. - **Defining Negative Characteristics:** The anti-marker profile robustly defines what an [erythrocyte](/details-cell/CL0000232) is not. There is a profound lack of transcripts for core mitochondrial machinery involved in oxidative phosphorylation, including multiple NADH dehydrogenase subunits ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND4](/details-gene/4538), [ND5](/details-gene/4540)), cytochrome b ([CYTB](/details-gene/4519)), and cytochrome c oxidase subunits ([COX1](/details-gene/4512), [COX3](/details-gene/4514)). This strongly corroborates the cell's reliance on anaerobic glycolysis. Similarly, the negative significance of genes involved in transcription and mRNA splicing, such as [DDX5](/details-gene/1655), [HNRNPU](/details-gene/3192), and the histone gene [H3-3B](/details-gene/3021), provides molecular confirmation of its anucleated state. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of the [erythrocyte](/details-cell/CL0000232) has direct implications for hematological disorders and may hint at broader systemic functions. The prominence of ferritin genes ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) directly relates to disorders of iron metabolism, such as iron-deficiency anemia and hemochromatosis. Measuring the expression of these genes in erythrocyte precursors could serve as a sensitive indicator of systemic iron status. The unexpected identification of immune-related transcripts like [CCL5](/details-gene/6352) and [FCN1](/details-gene/2219) as specific markers is intriguing. Erythrocytes are known to bind and transport chemokines, but the presence of their specific transcripts suggests a potential for endogenous production. This could implicate erythrocytes as active participants in inflammatory processes, potentially by acting as a distributed reservoir or even a source of signaling molecules that modulate leukocyte function and trafficking ([Link](https://pubmed.ncbi.nlm.nih.gov/2456327/)). The expression of [FCN1](/details-gene/2219), involved in the lectin complement pathway, further supports a role in innate immunity ([Link](https://doi.org/10.1042/bj3130473)). The presence of canonical lymphocyte markers such as [CD2](/details-gene/914), [CD79A](/details-gene/973), and [KLRB1](/details-gene/3820) is highly unusual. While this could potentially arise from minor leukocyte contamination in the underlying datasets, the high specificity scores warrant consideration of novel functions. For instance, erythrocytes might acquire these proteins from other cells via trogocytosis or express them at low but functionally relevant levels, participating in cell-cell interactions in ways not yet understood. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The specific expression of a suite of immune-related transcripts ([CCL5](/details-gene/6352), [GNLY](/details-gene/10578), [FCN1](/details-gene/2219), [CD2](/details-gene/914)) suggests that the [erythrocyte](/details-cell/CL0000232) functions as an underappreciated immunomodulatory cell, capable of synthesizing and potentially releasing signaling molecules that influence systemic immune responses. - **Surprising Findings:** The identification of transcripts for canonical markers of T-cells ([CD2](/details-gene/914)), B-cells ([CD79A](/details-gene/973)), and NK-cells ([KLRB1](/details-gene/3820), [GNLY](/details-gene/10578)) as specific to erythrocytes is a significant departure from classical hematology and immunology. - **Testable Questions:** Can mature erythrocytes be induced to translate and secrete functional CCL5 protein upon exposure to inflammatory stimuli like lipopolysaccharide (LPS) or pathogen-associated molecular patterns? 2. **Hypothesis:** The high expression specificity of regulators of protein synthesis and degradation, particularly [OAZ1](/details-gene/4946), indicates that precise control of polyamine levels and protein turnover is a defining and critical feature for maintaining the structural integrity and extended lifespan of the anucleated [erythrocyte](/details-cell/CL0000232). - **Surprising Findings:** While protein turnover is a general cellular process, the exceptional specificity of [OAZ1](/details-gene/4946) suggests that the inhibition of ornithine decarboxylase is a uniquely important feature of the erythrocyte lineage, possibly to prevent metabolic activities incompatible with its terminal state. - **Testable Questions:** Does pharmacological inhibition or genetic knockdown of [OAZ1](/details-gene/4946) in erythroid precursor cells lead to defects in terminal differentiation, reduced lifespan, or altered membrane deformability in the resulting mature erythrocytes?