CYP3A4, Official Symbol CYP3A4provided by HGNC Official Full Name cytochrome P450 family 3 subfamily A member 4provided by HGNC Primary source HGNC:HGNC:2637 See related Ensembl:ENSG00000160868 MIM:124010; AllianceGenome:HGNC:2637 Gene type protein coding RefSeq status REVIEWED Organism Homo sapiens Lineage Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo Also known as HLP; CP33; CP34; CYP3A; NF-25; VDDR3; CYP3A3; P450C3; CYPIIIA3; CYPIIIA4; P450PCN1 Summary This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases that catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and its expression is induced by glucocorticoids and some pharmacological agents. This enzyme is involved in the metabolism of approximately half the drugs in use today, including acetaminophen, codeine, cyclosporin A, diazepam, erythromycin, and chloroquine. The enzyme also metabolizes some steroids and carcinogens. This gene is part of a cluster of cytochrome P450 genes on chromosome 7q21.1. Previously another CYP3A gene, CYP3A3, was thought to exist; however, it is now thought that this sequence represents a transcript variant of CYP3A4. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Aug 2020] Expression Biased expression in liver (RPKM 476.5), small intestine (RPKM 282.8) and 1 other tissue See more Orthologs all