Details for: CL0000946

Cell ID: CL0000946

Cell Name: antibody secreting cell

Description: A lymphocyte of B lineage that is devoted to secreting large amounts of immunoglobulin.

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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 antibody secreting 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 antibody secreting 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 antibody secreting 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 antibody secreting 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:  antibody secreting cell (CL0000946)

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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 [antibody secreting cell](/details-cell/CL0000946), a terminally differentiated B lineage lymphocyte, is transcriptionally defined by its profound dedication to the mass production and secretion of immunoglobulins. The gene significance profile is overwhelmingly dominated by components essential for this high-throughput protein synthesis and export pathway. Top markers include not only immunoglobulin-related genes like [IGHA1](/details-gene/3493) and [JCHAIN](/details-gene/3512), but also critical regulators of transcription ([SUB1](/details-gene/10923)), protein folding ([XBP1](/details-gene/7494)), and secretion ([SEC11C](/details-gene/90701)). This signature highlights a cellular state optimized for an exceptionally high metabolic and secretory load, establishing its role as a cornerstone of the humoral immune response. ## Key Characteristics and Function **Overall**, the gene expression profile of the [antibody secreting cell](/details-cell/CL0000946) paints a picture of a highly specialized cellular factory. The top marker genes can be categorized into several core functional clusters that collectively enable its primary function. * **Immunoglobulin Synthesis and Assembly:** The cell's defining purpose is reflected in the high significance of immunoglobulin-related genes such as the IgA heavy chain constant region ([IGHA1](/details-gene/3493), CSI: 17.81), the Ig kappa constant region ([IGKC](/details-gene/3514), CSI: 15.78), and the joining chain ([JCHAIN](/details-gene/3512), CSI: 16.96) required for the assembly of polymeric IgA and IgM. Further supporting this function, [MZB1](/details-gene/51237) (CSI: 14.61), which is known to promote the correct oxidative folding and assembly of immunoglobulins ([Link](https://doi.org/10.1073/pnas.0811591106)), is also a highly specific marker. The master transcription factor [XBP1](/details-gene/7494) (CSI: 17.10), essential for plasma cell differentiation and the unfolded protein response that accommodates massive protein secretion, is a key marker defining this cell's identity. * **Protein Processing and Secretory Machinery:** To handle the immense immunoglobulin output, the cell upregulates the entire protein synthesis and export pathway. This is evidenced by the high significance of [SEC11C](/details-gene/90701) (CSI: 18.81), a component of the signal peptidase complex that cleaves signal peptides from nascent secretory proteins, and [OST4](/details-gene/100128731) (CSI: 14.49), a subunit of the oligosaccharyltransferase complex required for N-linked glycosylation in the endoplasmic reticulum ([Link](https://doi.org/10.1242/jcs.115410)). The high CSI for the translation elongation factor [EEF1B2](/details-gene/1933) (CSI: 16.73) and ribosome biogenesis-associated proteins like [NPM1](/details-gene/4869) (CSI: 14.22) and [NCL](/details-gene/4691) (CSI: 13.80) further underscores the cell's commitment to high-volume protein synthesis. * **High Metabolic Activity:** Supporting this biosynthetic activity requires a substantial energy supply. The gene profile reflects this with the specific expression of multiple components of the mitochondrial ATP synthase complex, including [ATP5MG](/details-gene/10632) (CSI: 16.99) and [ATP5F1E](/details-gene/514) (CSI: 16.78), as well as cytochrome c oxidase subunits like [COX6C](/details-gene/1345) (CSI: 15.39) and [COX7A2](/details-gene/1347) (CSI: 14.40). This indicates a reliance on oxidative phosphorylation to fuel its demanding secretory function. * **Antigen Presentation and Immune Interaction:** The high significance of Beta-2-microglobulin ([B2M](/details-gene/567), CSI: 20.46), an essential component of MHC class I molecules, suggests that these cells retain robust machinery for presenting endogenous antigens. This may allow for continued interaction with and regulation by cytotoxic T lymphocytes. In contrast, the low significance of the B-cell receptor component [CD79A](/details-gene/973) is consistent with the known downregulation of surface immunoglobulin upon terminal differentiation into an antibody-secreting cell. ## Clinical Significance and Contextual Roles The gene profile of the [antibody secreting cell](/details-cell/CL0000946) provides insights into its role in both protective immunity and disease. Dysregulation of this cell type and its core transcriptional programs is central to various pathologies. The most prominent function, antibody production, is highlighted by markers like [IGHA1](/details-gene/3493) and [IGKC](/details-gene/3514). Aberrant production of immunoglobulins by clonal populations of these cells is the hallmark of plasma cell dyscrasias, including multiple myeloma and monoclonal gammopathy of undetermined significance (MGUS). The transcription factor [XBP1](/details-gene/7494), a top marker for this cell, is a well-established dependency in multiple myeloma, where it is required to manage the extreme proteotoxic stress of monoclonal protein production, making it a key therapeutic target. The high significance of [HMGB1](/details-gene/3146) (CSI: 16.39) is also of clinical interest. While a nuclear protein, [HMGB1](/details-gene/3146) can be released from stressed or dying cells and acts as a potent pro-inflammatory cytokine or Damage-Associated Molecular Pattern (DAMP). Its specific expression in antibody-secreting cells suggests they may contribute to local inflammation in tissues beyond their role in secreting antibodies, particularly in chronic inflammatory or autoimmune settings. Furthermore, the general transcription coactivator [SUB1](/details-gene/10923) (also known as PC4) is the top-ranked marker by z-score (CSI: 25.31). As a factor that mediates the effects of transcriptional activators ([Link](https://doi.org/10.1016/0092-8674(94)90428-6)), its exceptional specificity suggests that the global potentiation of transcription is a uniquely defining, and potentially vulnerable, aspect of this cell's biology. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The extreme secretory capacity of antibody-secreting cells is not merely an upregulation of individual components but is enabled by a distinct, globally-acting transcriptional amplification program. The status of [SUB1](/details-gene/10923)/PC4 as the most specific marker, surpassing even immunoglobulin genes, suggests it acts as a critical hub, coordinating the high-level expression of the entire secretory and metabolic machinery required for the plasma cell state. * **Surprising Findings:** It is unexpected that a general coactivator like [SUB1](/details-gene/10923) would exhibit greater cell-type specificity than the very proteins ([IGHA1](/details-gene/3493), [JCHAIN](/details-gene/3512)) that define the cell's unique product. This implies that the *rate-limiting* and most defining characteristic of this cell is not the presence of immunoglobulin genes, but the ability to transcribe them and their supporting cast at an extraordinary rate. * **Testable Questions:** What is the specific role of [SUB1](/details-gene/10923) in plasma cell differentiation and function? Does targeted inhibition of [SUB1](/details-gene/10923) in a B cell lineage lead to a global collapse of the secretory program or does it selectively impact a subset of highly transcribed genes like immunoglobulins, potentially revealing a mechanism for throttling antibody production? 2. **Hypothesis:** Antibody-secreting cells function as more than just passive antibody "factories" and actively shape the local tissue microenvironment through sustained MHC class I antigen presentation. The co-occurrence of high [B2M](/details-gene/567) expression with the downregulation of BCR signaling components (e.g., low CSI for [CD79A](/details-gene/973)) suggests a functional switch from antigen capture and presentation to [T helper cells](/details-cell/CL0000895) (via MHC-II) to presentation of endogenous peptides to cytotoxic T lymphocytes (via MHC-I). * **Surprising Findings:** While plasma cells are considered terminally differentiated, the robust expression of [B2M](/details-gene/567) suggests they remain under active immune surveillance. This retained function implies that the cytotoxic T cell axis may be a critical, and perhaps underappreciated, mechanism for regulating the lifespan and population size of long-lived plasma cells in tissues like the bone marrow. * **Testable Questions:** What is the repertoire of peptides presented by long-lived plasma cells on MHC class I in vivo? Does this peptide repertoire change under conditions of stress or viral infection, and can antigen-specific cytotoxic T cells recognize and eliminate these antibody-secreting cells, providing a feedback loop to terminate a specific humoral response?