MUC1（mucin 1， cell surface associated），癌症关联基因，基因ID：4582，这个基因编码一种膜结合蛋白，它是粘蛋白家族的一员。黏蛋白是一种o-糖基化蛋白，在上皮表面形成保护性粘液屏障中起着重要作用。这些蛋白质也在细胞内信号传导中发挥作用。这种蛋白在上皮细胞的顶面表达，上皮细胞排列在许多不同组织的粘膜表面，包括肺、乳腺胃和胰腺。这种蛋白质被蛋白质水解成α和β亚单位，形成异二聚体复合物。n-末端α亚单位在细胞粘附中起作用，c-末端β亚单位参与细胞信号传导。这种蛋白的过度表达、细胞内异常定位和糖基化的变化与癌症有关。已知该基因含有高度多态性的可变数目串联重复序列（vntr）结构域。交替剪接导致多个转录变体。[由RefSeq提供，2011年2月]This gene encodes a membrane-bound protein that is a member of the mucin family. Mucins are O-glycosylated proteins that play an essential role in forming protective mucous barriers on epithelial surfaces. These proteins also play a role in intracellular signaling. This protein is expressed on the apical surface of epithelial cells that line the mucosal surfaces of many different tissues including lung， breast stomach and pancreas. This protein is proteolytically cleaved into alpha and beta subunits that form a heterodimeric complex. The N-terminal alpha subunit functions in cell-adhesion and the C-te。