FCGR3A（Fc fragment of IgG receptor IIIa），癌症关联基因，基因ID：2214，该基因编码免疫球蛋白G的Fc部分的受体，参与从循环中去除抗原抗体复合物以及其他抗体依赖性反应。该基因（fcgr3a）与位于1号染色体上的另一个邻近基因（fcgr3b）高度相似。该基因编码的受体在自然杀伤细胞（NK）上表达为一种通过跨膜肽锚定的完整膜糖蛋白，而fcgr3b在多形核中性粒细胞（PMN）上表达，其中受体通过磷脂酰肌醇（PI）连接锚定。这种基因的突变与反复病毒感染的易感性、系统性红斑狼疮的易感性以及新生儿同种免疫中性粒细胞减少症有关。另外，还发现了编码不同亚型的剪接转录变体。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 susc。