CD20 & CD22

MS4A1 (Membrane Spanning 4-Domains A1) is a Protein Coding gene. Diseases associated with MS4A1 include Immunodeficiency, Common Variable, 5 and Common Variable Immunodeficiency. Among its related pathways are B Cell Development Pathways and Hematopoietic Stem Cell Differentiation Pathways and Lineage-specific Markers. Gene Ontology (GO) annotations related to this gene include epidermal growth factor receptor binding and MHC class II protein complex binding.

CD22 is a B-cell-specific transmembrane glycoprotein belonging to the SIGLEC (sialic acid-binding immunoglobulin-like lectin) family. It is encoded by the CD22 gene located on chromosome 19q13.1. CD22 plays a crucial role in B-cell signaling and immune response modulation. It acts primarily as an inhibitory co-receptor that regulates B-cell receptor (BCR) signaling, thereby preventing overactivation of B cells and reducing the risk of autoimmunity. CD22 binds to sialylated glycans and recruits SHP-1 (Src homology region 2 domain-containing phosphatase-1), a phosphatase that dampens signaling cascades.