Details for: CL0000787

Cell ID: CL0000787

Cell Name: memory B cell

Description: Memory B-cells are also reportedly CD5-negative, CD10-negative, CD21-positive, CD22-positive, CD23-negative, CD24-positive, CD25-positive, CD27-positive, CD34-negative, CD38-negative, CD40-positive, CD43-negative, CD44-positive, CD45-positive, CD53-positive, CD80-negative, CD81-negative, CD86-positive, and CD196/CCR6-positive.

Synonyms: memory B lymphocyte, memory B-cell, memory 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 memory 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 memory 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 memory 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 memory 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:  memory B cell (CL0000787)

 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 [memory B cell](/details-cell/CL0000787) is a long-lived lymphocyte that constitutes a critical component of adaptive immunity, providing a rapid and robust response upon secondary exposure to an antigen. Based on its gene significance profile in the **Overall** context, the defining characteristic of this cell type appears to be a state of heightened metabolic and translational readiness. The top markers are not exclusively B-cell lineage-specific genes, but rather a suite of genes involved in fundamental cellular processes such as oxidative phosphorylation (e.g., [COX1](/details-gene/4512), [B2M](/details-gene/567)), protein synthesis (e.g., [TPT1](/details-gene/7178), [PABPC1](/details-gene/26986)), and cellular maintenance. This molecular signature is consistent with a quiescent but poised sentinel cell, capable of sustained survival and rapid activation and differentiation into antibody-secreting plasma cells. ## Key Characteristics and Function Analysis of top marker genes, ranked by expression specificity (CSI Z-Score), reveals several core functional clusters that define the [memory B cell](/details-cell/CL0000787)'s physiological state. * **Metabolic Priming and Energy Production:** A striking number of top markers are components of the mitochondrial respiratory chain and ATP synthesis machinery. These include multiple subunits of cytochrome c oxidase ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX4I1](/details-gene/1327), [COX7C](/details-gene/1350)), ATP synthase ([ATP5F1E](/details-gene/514)), and the ADP/ATP translocator ([SLC25A6](/details-gene/293)). This strong signature of oxidative phosphorylation suggests that [memory B cells](/details-cell/CL0000787) are metabolically primed to meet the high energy demands required for long-term survival and rapid, extensive proliferation upon reactivation. Supporting this, genes involved in iron homeostasis, such as ferritin heavy and light chains ([FTH1](/details-gene/2495) and [FTL](/details-gene/2512)), are also highly significant, as iron is a critical cofactor for electron transport chain complexes. * **Robust Translational Capacity:** The cell maintains a uniquely high level of translational machinery. Top markers include the translationally controlled tumor protein ([TPT1](/details-gene/7178)), poly(A) binding protein ([PABPC1](/details-gene/26986)), and several eukaryotic translation elongation factors ([EEF1D](/details-gene/1936), [EEF1B2](/details-gene/1933)). This indicates that the cell is poised to rapidly synthesize large quantities of protein, a prerequisite for its differentiation into high-rate antibody-secreting plasma cells. * **Immune Surveillance and Interaction:** The high significance of beta-2-microglobulin ([B2M](/details-gene/567)), the light chain of MHC class I molecules, and the non-classical MHC class I molecule [HLA E](/details-gene/3133) underscores the role of [memory B cells](/details-cell/CL0000787) in antigen presentation and interaction with other immune cells, such as T-cells and NK cells. This is consistent with their function in immune surveillance and the coordination of secondary immune responses. * **Maintenance of Quiescence:** The high specificity score for [BTG1](/details-gene/694), a known anti-proliferative gene ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)), suggests the presence of active mechanisms to maintain the cell in a quiescent state, preventing inappropriate activation and proliferation while ensuring long-term persistence. * **Cellular Identity:** Interestingly, canonical B-cell markers such as the transcription factor [PAX5](/details-gene/5079), the surface receptor [CD22](/details-gene/933), and the chemokine receptor [CXCR5](/details-gene/643) exhibit low expression specificity scores (CSI Z-Scores). This does not indicate their absence, but rather that their expression levels are not unusually high in [memory B cells](/details-cell/CL0000787) when compared to the broad average of all other cell types. This suggests that in a general context, the defining signature of a [memory B cell](/details-cell/CL0000787) is less about its shared B-lineage markers and more about its uniquely prepared metabolic and translational state. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of the [memory B cell](/details-cell/CL0000787) highlights its central role in adaptive immunity and potential involvement in pathology. The cell's inherent capacity for longevity, rapid proliferation, and massive protein production makes it a cell of interest in both protective immunity and autoimmune or malignant conditions. The high expression of genes like [BTG1](/details-gene/694), which has been implicated in chromosomal translocations in B-cell chronic lymphocytic leukemia ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)), suggests that dysregulation of its quiescence program could be a factor in lymphomagenesis. Furthermore, the cell's reliance on a robust metabolic engine, indicated by the prominence of mitochondrial genes, may represent a therapeutic vulnerability in B-cell malignancies, which are often characterized by metabolic reprogramming. The significant expression of [B2M](/details-gene/567) is clinically relevant, as mutations in this gene are a known mechanism of tumor immune escape, allowing cancer cells to evade detection by cytotoxic T-cells. The pronounced translational readiness could also be exploited by oncogenic pathways to drive malignant growth and survival. ## Potential Mechanisms and Research Directions 1. **Hypothesis: The defining characteristic of a [memory B cell](/details-cell/CL0000787)'s identity in a broad cellular landscape is a state of "poised metabolism," where uniquely high levels of oxidative phosphorylation machinery are maintained to ensure long-term survival and fuel rapid reactivation, rather than the expression of B-lineage-defining antigens.** * **Surprising Findings:** Canonical B-cell identity genes such as [PAX5](/details-gene/5079) and [CD22](/details-gene/933) display low specificity scores (`csi_z`). This finding challenges the assumption that lineage-defining transcription factors and surface markers are always the most statistically specific identifiers of a cell type across a diverse biological system. It suggests that functional preparedness may be a more unique feature than lineage heritage in this context. * **Testable Questions:** Does pharmacologic inhibition of the electron transport chain (e.g., using rotenone or antimycin A) disproportionately reduce the viability or recall response capacity of [memory B cells](/details-cell/CL0000787) compared to their naive B-cell counterparts or memory T-cell populations? 2. **Hypothesis: The high expression specificity of the anti-proliferative gene [BTG1](/details-gene/694) acts as a critical brake to maintain quiescence, which is coupled to a highly active translational-preparedness program (marked by [TPT1](/details-gene/7178), [PABPC1](/details-gene/26986)) that allows for immediate and massive protein synthesis upon release of this inhibition during a recall response.** * **Surprising Findings:** The co-occurrence of a strong anti-proliferative gene signature with a robust pro-translational machinery signature is paradoxical. This suggests a sophisticated regulatory network that uncouples cell growth from translational capacity, allowing the cell to remain dormant yet fully equipped for future function. * **Testable Questions:** In an in-vitro model, does shRNA-mediated knockdown of [BTG1](/details-gene/694) in primary human [memory B cells](/details-cell/CL0000787) lead to spontaneous entry into the cell cycle or an enhanced rate of differentiation into plasma cells following antigen stimulation, and is this effect blunted by inhibitors of translation?