Cytochrome P450 20A1 (CYP20A1)

Cytochrome P450 20A1 (CYP20A1) is an orphan member of the cytochrome P450 enzyme superfamily, found as a single copy gene in vertebrates and classified as the only member of the CYP20 family[2]. Unlike many other cytochrome P450 enzymes, the physiological substrates and catalytic activity of CYP20A1 remain unknown, with no detected activity toward tested steroids, cholesterol, or neurotransmitters in in vitro studies[1][2]. CYP20A1 shows conserved sequence features typical of P450s but also possesses unusual motifs in the I-helix and heme-binding regions, suggesting potentially unique catalytic properties[1]. Its expression has been documented in the brain (notably the hippocampus and substantia nigra), gonads, and during early embryonic development in multiple species, indicating possible functions in neuronal and reproductive biology[1][2]. Loss of CYP20A1 in humans (as part of chromosomal deletions) is associated with neurodevelopmental symptoms such as hyperactivity and anxiety, while animal model knockouts likewise exhibit behavioral phenotypes, supporting a biological role in neurodevelopment and behavior regulation[1][2]. The lack of known interacting drugs or defined biomarkers, as well as absence of established safety profiles, reflect its status as a functionally uncharacterized ("orphan") P450[1][2][3][4].

Other names

Cytochrome P450 family 20 subfamily A member 1cytochrome P450 monooxygenaseCYP-MUNQ667/PRO1301CP20Acytochrome P450, family 20, subfamily A, polypeptide 1