Anti-MUM1

MUM1 is a nuclear transcriptional factor (IRF4 or Multiple Myeloma 1 ) and is expressed in final step of intragerminal center B cell differentiation and in post-germinal center B cells. MUM1 is usually mutually exclusive with BCL6 in nonneoplastic tissue. Nuclear expression is present also in a subpopulation of activated T- lymphocytes and expressed in normal and neoplastic melanocytes. In neoplasms MUM1 is found mainly in B-cell lymphoma and melanocytic lesions. In combination with CD138 and Ig´s makes MUM1 more specific marker for differentiating B-cells before plasma cell stage. MUM1 helps to divide diffuse large B cell lymphomas into germinal center (MUM1-) /non-germinal center (MUM1+) phenotypes and helps also to differentiate double hit from Burkitt and DLCL. Control: Tonsil, Colon. Protein function: Transcriptional activator. Binds to the interferon-stimulated response element (ISRE) of the MHC class I promoter. Binds the immunoglobulin lambda light chain enhancer, together with PU.1. Probably plays a role in ISRE-targeted signal transduction mechanisms specific to lymphoid cells. Involved in CD8(+) dendritic cell differentiation by forming a complex with the BATF-JUNB heterodimer in immune cells, leading to recognition of AICE sequence (5'-TGAnTCA/GAAA- 3'), an immune-specific regulatory element, followed by cooperative binding of BATF and IRF4 and activation of genes. [The UniProt Consortium]