LDLR（low density lipoprotein receptor），癌症关联基因，基因ID：3949，低密度脂蛋白受体（ldlr）基因家族由参与受体介导的特异性配体内吞的细胞表面蛋白组成。低密度脂蛋白（LDL）通常结合在细胞膜上，进入细胞，最后进入溶酶体，在溶酶体中蛋白质被降解，胆固醇可用于抑制微粒体酶3-羟基-3-甲基戊二酰辅酶A（HMG-CoA）还原酶，这是胆固醇合成的限速步骤同时，胆固醇酯的合成也发生了相互刺激该基因突变导致常染色体显性遗传病，家族性高胆固醇血症。交替剪接导致多个转录变体。[由RefSeq提供，2010年9月]The low density lipoprotein receptor (LDLR) gene family consists of cell surface proteins involved in receptor-mediated endocytosis of specific ligands. Low density lipoprotein (LDL) is normally bound at the cell membrane and taken into the cell ending up in lysosomes where the protein is degraded and the cholesterol is made available for repression of microsomal enzyme 3-hydroxy-3-methylglutaryl coenzyme A (HMG CoA) reductase， the rate-limiting step in cholesterol synthesis. At the same time， a reciprocal stimulation of cholesterol ester synthesis takes place. Mutations in this gene cause the autosomal dominant disorder， familial hypercholesterolemia. Alternate spli。