Details for: CL0000236

Cell ID: CL0000236

Cell Name: B cell

Description: A lymphocyte of B lineage that is capable of B cell mediated immunity.

Synonyms: B lymphocyte, B-cell, B-lymphocyte

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 B 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 B 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 B 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 B 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:  B cell (CL0000236)

 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 [B cell](/details-cell/CL0000236), or B lymphocyte, is a key component of the adaptive immune system, defined by its capacity for B cell-mediated immunity. Analysis of its gene expression profile reveals a cell that is not only defined by canonical immune receptors but is also fundamentally characterized by a state of high metabolic readiness and a robust capacity for protein synthesis. The top markers include genes essential for antigen presentation like [B2M](/details-gene/567) and [HLA DPA1](/details-gene/3113), the B-cell receptor component [CD79B](/details-gene/974), and, most notably, a suite of genes involved in translation such as [TPT1](/details-gene/7178) and [EEF1B2](/details-gene/1933). This molecular signature suggests a cell metabolically poised for rapid activation and differentiation into antibody-secreting plasma cells. ## Key Characteristics and Function **Overall**, the gene significance profile of the [B cell](/details-cell/CL0000236) highlights its dual role as both a sentinel of the adaptive immune system and a potential factory for protein production. The top markers can be grouped into several key functional clusters: * **Antigen Presentation and Immune Signaling:** The high expression specificity ([csi_z](/methodology/csi_z)) for [B2M](/details-gene/567) (a component of MHC class I) and [HLA DPA1](/details-gene/3113) (MHC class II) underscores the [B cell](/details-cell/CL0000236)'s critical function as an antigen-presenting cell. This is complemented by the high significance of canonical B cell markers like [CD79B](/details-gene/974), a core component of the B-cell receptor complex essential for signal transduction, and [PTPRC](/details-gene/5788) (CD45), a pan-leukocyte marker crucial for lymphocyte signaling. This combination solidifies the cell's identity and its role in initiating adaptive immune responses. * **Protein Synthesis and Translational Machinery:** A striking feature of the [B cell](/details-cell/CL0000236) profile is the prominence of genes associated with protein synthesis. The top marker, [TPT1](/details-gene/7178) (Translationally Controlled Tumor Protein), along with elongation factors [EEF1B2](/details-gene/1933) and [EEF1D](/details-gene/1936), and the poly(A)-binding protein [PABPC1](/details-gene/26986), all exhibit high specificity. This suggests that a core, defining feature of a [B cell](/details-cell/CL0000236) is its extensive and tightly regulated translational apparatus, likely maintaining it in a state prepared for the massive production of antibodies upon differentiation. * **High Metabolic Activity and Energy Production:** Consistent with the demands of protein synthesis and immune activation, [B cells](/details-cell/CL0000236) show a specific signature of high energy metabolism. Multiple subunits of the mitochondrial respiratory chain are top markers, including components of cytochrome c oxidase ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX7C](/details-gene/1350), [COX4I1](/details-gene/1327)) and ATP synthase ([ATP5F1E](/details-gene/514), [SLC25A6](/details-gene/293)). This indicates a reliance on oxidative phosphorylation to fuel its cellular processes. * **Regulation of Cell State and Proliferation:** The transcriptional landscape is controlled by key regulatory factors. The high specificity of the anti-proliferative gene [BTG1](/details-gene/694) may indicate an active mechanism to maintain quiescence in naive B cells until an appropriate antigenic stimulus is received. This is balanced by factors involved in ribosome biogenesis and cell growth, such as [NPM1](/details-gene/4869). The anti-marker profile is less definitive, with many genes showing only slightly negative or low positive significance scores. However, the negative CSI for specific mitochondrial genes like [COX6A1](/details-gene/1337) and [NDUFA4](/details-gene/4697) compared to the highly significant COX and ATP synthase subunits suggests a specific, optimized composition of the respiratory chain in B cells. ## Clinical Significance and Contextual Roles The gene expression profile of [B cells](/details-cell/CL0000236) provides insights into their roles in health and disease. As there is only an **Overall** context, the analysis focuses on the intrinsic properties of these cells. The high significance of [BTG1](/details-gene/694) is clinically relevant, as this gene is directly implicated in a chromosomal translocation t(8;12) found in B-cell chronic lymphocytic leukemia ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)), highlighting its role in controlling B cell proliferation. Similarly, [NPM1](/details-gene/4869) is a well-known proto-oncogene whose dysregulation is associated with various hematological malignancies. Its role in ribosome biogenesis and cell growth regulation makes its high specificity in B cells a point of interest for understanding B-cell lymphomas. The defining roles of [CD79B](/details-gene/974), [B2M](/details-gene/567), and [HLA DPA1](/details-gene/3113) in immune signaling and antigen presentation are central to B cell pathology. Dysregulation of the B-cell receptor signaling pathway, in which [CD79B](/details-gene/974) is a critical component, can lead to autoimmunity or lymphoma development. Furthermore, variations in HLA genes are strongly associated with a wide range of autoimmune diseases, where B cells may act as pathogenic antigen-presenting cells. The general metabolic profile, rich in protein synthesis and energy production machinery, underscores why B-cell-derived malignancies like multiple myeloma can be so aggressive in their production of monoclonal proteins. ## Potential Mechanisms and Research Directions 1. **Hypothesis: B cells are maintained in a "metabolically poised" state for rapid immune response.** The unique co-expression of highly specific markers for both robust protein synthesis machinery ([TPT1](/details-gene/7178), [EEF1B2](/details-gene/1933)) and a specialized complement of mitochondrial respiratory chain subunits ([COX1](/details-gene/4512), [COX7C](/details-gene/1350)) suggests that B cells exist in a state of high metabolic readiness. This poised state may be crucial for facilitating the rapid clonal expansion and differentiation into high-rate antibody-secreting plasma cells that is required upon antigen encounter. * **Surprising Findings:** The most specific marker identified in this analysis is not a classic immune receptor but [TPT1](/details-gene/7178), a protein involved in regulating translation. This suggests that the control of protein synthesis is a uniquely defining feature of B cell identity, potentially more so than some cell surface antigens in this context. * **Testable Questions:** How does the specific expression profile of mitochondrial subunits (e.g., high specificity for [COX1](/details-gene/4512) and [COX7C](/details-gene/1350) vs. negative CSI for [COX6A1](/details-gene/1337)) impact the efficiency and capacity of oxidative phosphorylation in quiescent versus antigen-activated B cells? 2. **Hypothesis: The anti-proliferative factor BTG1 acts as a critical gatekeeper of B cell quiescence.** The high expression specificity of the anti-proliferative gene [BTG1](/details-gene/694) alongside a full suite of factors for protein synthesis presents a paradox. We hypothesize that [BTG1](/details-gene/694) actively maintains B cell quiescence by suppressing cell cycle progression, acting as a crucial brake. Downregulation or inactivation of [BTG1](/details-gene/694) could therefore be a key checkpoint that must be overcome during B cell activation to permit clonal expansion. * **Surprising Findings:** It is counterintuitive that a potent anti-proliferative gene ranks as a top specificity marker for a cell type renowned for its capacity for massive proliferation. This finding emphasizes that the default, unstimulated state of a B cell is one of active growth suppression. * **Testable Questions:** Does the targeted knockdown of [BTG1](/details-gene/694) in primary naive B cells lower their activation threshold, leading to proliferation in response to sub-optimal T-cell help or lower-affinity antigens?