EGFR & FcγRIII

This gene encodes a receptor for the Fc portion of immunoglobulin G, and it is involved in the removal of antigen-antibody complexes from the circulation, as well as other other antibody-dependent responses. This gene (FCGR3A) is highly similar to another nearby gene (FCGR3B) located on chromosome 1. The receptor encoded by this gene is expressed on natural killer (NK) cells as an integral membrane glycoprotein anchored through a transmembrane peptide, whereas FCGR3B is expressed on polymorphonuclear neutrophils (PMN) where the receptor is anchored through a phosphatidylinositol (PI) linkage. Mutations in this gene have been linked to susceptibility to recurrent viral infections, susceptibility to systemic lupus erythematosus, and alloimmune neonatal neutropenia. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.

EGFR encodes a receptor tyrosine kinase that is involved in the regulation of cell growth, survival, and differentiation. It is activated by binding to its ligands, such as epidermal growth factor (EGF), and mediates downstream signaling pathways that control cellular processes like proliferation, migration, and differentiation. EGFR is critical in normal development, wound healing, and tissue repair. However, mutations or overexpression of EGFR are associated with various cancers, including non-small cell lung cancer (NSCLC), making EGFR a target for cancer therapies, including monoclonal antibodies and tyrosine kinase inhibitors.