IGHG4 protein expression summary - The Human Protein Atlas

IGHG4

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IGHG4

IGHG4 INFORMATION
Proteinⁱ Full gene name according to HGNC.	Immunoglobulin heavy constant gamma 4 (G4m marker)
Gene nameⁱ Official gene symbol, which is typically a short form of the gene name, according to HGNC.	IGHG4
Protein classⁱ Assigned HPA protein class(es) for the encoded protein(s).	FDA approved drug targets Immunoglobulin genes Plasma proteins
Protein evidence	Evidence at protein level (all genes)
Number of transcriptsⁱ Number of protein-coding transcripts from the gene as defined by Ensembl.	2
Protein interactions	Interacting with 21 proteins

IGHG4 AI GENERATED INFOGRAPHICⁱ This infographic was generated by AI (Gemini) using only data presented in the Human Protein Atlas v25. It is a quick overview and may contain errors or simplifications, so please check the full data on this gene page before drawing conclusions. Read more

PROTEIN EXPRESSION AND LOCALIZATION
Tissue profileⁱ A summary of the overall protein expression profile across the analyzed normal tissues based on knowledge-based annotation, presented in the Tissue resource. "Estimation of protein expression could not be performed. View primary data." is shown for genes where available RNA-seq and gene/protein characterization data in combination with immunohistochemistry data has been evaluated as not sufficient to yield a reliable estimation of the protein expression profile.	Cytoplasmic and plasma protein expression in several tissues.
Tissue specificity (MS)	Tissue enhanced (Lung)
Cell type specificity (DVP)	Low cell type specificity
Subcellular locationⁱ Main subcellular location based on data generated in the subcellular section of the Human Protein Atlas.	Not available
Predicted locationⁱ All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions. Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached. Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s). The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.	Secreted, Membrane, Intracellular (different isoforms)

TISSUE RNA EXPRESSION
Tissue specificityⁱ The RNA specificity category is based on normalized mRNA expression levels in the consensus dataset, calculated from the RNA expression levels in samples from HPA and GTEX. The categories include: tissue enriched, group enriched, tissue enhanced, low tissue specificity and not detected.	Tissue enriched (Lymphoid tissue)
Tissue expression clusterⁱ The RNA data was used to cluster genes according to their expression across tissues. Clusters contain genes that have similar expression patterns, and each cluster has been manually annotated to describe common features in terms of function and specificity.	Lymphoid tissue - Immune response (mainly)
Brain specificityⁱ The regional specificity category is based on mRNA expression levels in the analysed brain samples, grouped into 13 main brain regions and calculated for the three different species. All brain expression profiles are based on data from HPA. The specificity categories include: regionally enriched, group enriched, regionally enhanced, low regional specificity and not detected. The classification rules are the same used for the tissue specificity category	Domain enhanced (Pons, Spinal cord gray matter)
Brain expression clusterⁱ The RNA data was used to cluster genes according to their expression across tissues. Clusters contain genes that have similar expression patterns, and each cluster has been manually annotated to describe common features in terms of function and specificity.	Hindbrain - Mixed function (mainly)
Isoform expression categoryⁱ The expression category reflects the overall expression pattern for the gene based on expression profiles for all individual isoforms. Read more	Dominant isoform, all expressed
Evolutionary conservation categoryⁱ Conservation category is a categoric annotation that intends to capture the available pairwise species overlap annotations into one metric. The categories range from: Complete, Partial and Minimal Conservation for conserved genes; and Tissue elevation shift, human specific tissue elevated, Non-Human tissue elevated, Human specific detected and Human not detected for non conserved genes.	No 1-to-1 orthologs

CELL TYPE RNA EXPRESSION
Single cell type specificityⁱ The RNA specificity category is based on mRNA expression levels in the analyzed cell types based on scRNA-seq data from normal tissues. The categories include: cell type enriched, group enriched, cell type enhanced, low cell type specificity and not detected.	Cell type enriched (Plasma cells)
Single cell type expression clusterⁱ The RNA data was used to cluster genes according to their expression across single cell types. Clusters contain genes that have similar expression patterns, and each cluster has been manually annotated to describe common features in terms of function and specificity.	Plasma cells - Antibody production & secretion (mainly)
Bulk RNA deconvolution classificationⁱ Genes can have enriched specificity in different cell types in one or several tissues, or be enriched in a core cell type that appears in many different tissues.	Core cell type enriched (Plasma cells)
Immune cell specificityⁱ The RNA specificity category is based on mRNA expression levels in the analyzed samples based on data from HPA. The categories include: cell type enriched, group enriched, cell type enhanced, low cell type specificity and not detected.	Group enriched (memory B-cell, naive B-cell)
Immune cell expression clusterⁱ The RNA data was used to cluster genes according to their expression across single cell types. Clusters contain genes that have similar expression patterns, and each cluster has been manually annotated to describe common features in terms of function and specificity.	B-cells - Immunoglobulins (mainly)

CANCER & CELL LINES
Cancer specificity (RNA)ⁱ Specificity of RNA expression (TCGA dataset) across 21 cancer types is categorized as either cancer enriched, group enriched, cancer enhanced, low cancer specificity or not detected.	Low cancer specificity
Cancer specificity (Protein)ⁱ Specificity of protein abundance in tumor samples from 25 cancer types, measured by mass spectrometry (ProteinTalks DB dataset), is categorized as cancer enriched, group enriched, cancer enhanced, low cancer specificity or not detected.	Not detected
Cell line expression clusterⁱ The RNA data was used to cluster genes according to their expression across cell lines. Clusters contain genes that have similar expression patterns, and each cluster has been manually annotated to describe common features in terms of function and specificity.	Lymphoma - Humoral immune response (mainly)
Cell line specificityⁱ RNA specificity category based on RNA sequencing data from cancer cell lines in the Human Protein Atlas grouped according to type of cancer. Genes are classified into six different categories (enriched, group enriched, enhanced, low specificity and not detected) according to their RNA expression levels across the panel of cell lines.	Group enriched (Lymphoma, Myeloma)

PROTEINS IN BLOOD
Detected in blood by immunoassayⁱ The blood-based immunoassay category applies to actively secreted proteins and is based on plasma or serum protein concentrations established with enzyme-linked immunosorbent assays, compiled from a literature search. The categories include: detected and not detected, where detection refers to a concentration found in the literature search.	No (not applicable)
Detected in blood by mass spectrometryⁱ Detection or not of the gene in blood, based on spectral count estimations from a publicly available mass spectrometry-based plasma proteomics dataset obtained from the PeptideAtlas.	No
Proximity extension assayⁱ Indicates whether the protein has been measured (Data available) or not (Not available) using the Olink Explore HT proximity extension assay platform.	Not available
SomaScanⁱ Indicates whether the protein has been measured (Data available) or not (Not available) using the SomaScan 11K platform.	Data available

PROTEIN FUNCTION
Protein function (UniProt)ⁱ Useful information about the protein provided by UniProt.	Constant region of immunoglobulin (Ig) heavy chains. Igs are membrane-bound or secreted glycoproteins produced by B lymphocytes. In the recognition phase of humoral immunity, the membrane-bound Igs serve as receptors, which upon binding to a specific antigen trigger the clonal expansion and differentiation of B lymphocytes into Ig-secreting plasma cells. Secreted Igs known as antibodies mediate the effector phase of humoral immunity by blocking the interaction of infectious antigens with cellular receptors (via the antigen-binding region) and eliciting effector mechanisms that lead to pathogen neutralization (via the constant region) 1, 2, 3. The antigen-binding region is formed by the variable domain of one heavy chain paired with the variable domain of its associated light chain. Each Ig molecule has two antigen-binding sites with remarkable affinity for a particular antigen due to V-(D)-J rearrangement, somatic hypermutations and affinity maturation of the variable domains upon antigen exposure 4, 5, 6. The constant region defines the Ig isotype that perform distinct sets of effector functions. B cells diversify and rearrange their Ig constant regions through class-switch recombination, a process by which the constant region is switched from one Ig isotype to another, namely from IgM and IgD to IgG, IgA and IgE 7, 8, 9. The constant region interacts (via the fragment crystallizable, Fc) with the Fc receptors on innate immune cells to mediate humoral effector functions. Ig gamma-4 (IgG4) isotype does not elicit antibody-dependent cellular cytotoxicity (ADDC) or complement-dependent cytotoxicity (CDC). Instead it is likely involved in immune tolerance mechanisms to allergens and parasites either by blocking IgE-antigen complex formation or by directly inhibiting mast cell degranulation through Fc receptor signaling. In the context of tumorigenesis, it may participate in immunosuppressive mechanisms.... show less
Biological process (UniProt)ⁱ Keywords assigned by UniProt to proteins because they are involved in a particular biological process.	Adaptive immunity, Immunity

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