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The most common simplified overview description of the B cell differentiation pathway involves the following steps: an antigen interacts with the corresponding surface membrane immunoglobulin after which the B cell begins expressing receptors for growth factors secreted by T cells (BCGFs and IL-2), after these factors bind, the lymphocytes ...
The deletion of BCL6 is known to lead to failure of germinal center formation in the follicles of the lymph nodes, preventing B cells from undergoing somatic hypermutation. [6] Mutations in BCL6 can lead to B cell lymphomas because it promotes unchecked B cell growth. [6] Clinically, BCL6 can be used to diagnose B cell lymphomas and is shown to ...
A true homologue of mouse B-1 cells has not been discovered in humans, though various cell populations similar to B-1 cells have been described. [29] Regulatory B (Breg) cell An immunosuppressive B cell type that stops the expansion of pathogenic, pro-inflammatory lymphocytes through the secretion of IL-10, IL-35, and TGF-β. [31]
695 12229 Ensembl ENSG00000010671 ENSMUSG00000031264 UniProt Q06187 P35991 RefSeq (mRNA) NM_001287345 NM_000061 NM_001287344 NM_013482 RefSeq (protein) NP_000052 NP_001274273 NP_001274274 NP_038510 Location (UCSC) Chr X: 101.35 – 101.39 Mb Chr X: 133.44 – 133.48 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Bruton's tyrosine kinase (abbreviated Btk or BTK), also known as ...
During germinal center development of B lymphocytes, error-prone DNA repair following AID action also generates other types of mutations, such as C:G to A:T. AID is a member of the APOBEC family. In B cells in the lymph nodes, AID causes mutations that produce antibody diversity, but that same mutation process can also lead to B cell lymphoma. [8]
Random rearrangements and recombinations of the gene segments at DNA level to form one kappa or lambda light chain occurs in an orderly fashion. As a result, "a functional variable region gene of a light chain contains two coding segments that are separated by a non-coding DNA sequence in unrearranged germ-line DNA" (Barbara et al., 2007).
Mechanism of class-switch recombination that allows isotype switching in activated B cells. Immunoglobulin class switching, also known as isotype switching, isotypic commutation or class-switch recombination (CSR), is a biological mechanism that changes a B cell's production of immunoglobulin from one type to another, such as from the isotype IgM to the isotype IgG. [1]
The enzymatic activity of the RAG proteins is concentrated largely in a core region; Residues 384–1008 of RAG-1 and residues 1–387 of RAG-2 retain most of the DNA cleavage activity. The RAG-1 core contains three acidic residues (D 600 , D 708 , and E 962 ) in what is called the DDE motif , the major active site for DNA cleavage.