CYP2S1
Cytochrome P450 2S1 is a protein that in humans is encoded by the CYP2S1 gene. The gene is located in chromosome 19q13.2 within a cluster including other CYP2 family members such as CYP2A6, CYP2A13, CYP2B6, and CYP2F1.
CYP2S1 is highly expressed in epithelial tissues of the respiratory, gastrointestinal, urinary tracts, and skin and in leukocytes of the monocyte/macrophage and lymphocyte series; it is also expressed throughout Embryogenesis and, as discussed below, certain types of cancers.
This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum. In rodents, the homologous protein has been shown to metabolize certain carcinogens although its specific function(s) in humans has not been clearly determined. In in vitro studies, the human enzyme has been found to metabolize all-trans-retinoic acid to 4-hydroxy-retinoic acid and 5, 6-epoxy-retinoic acid and therefore may play a role in processing retinoic acid in tissues where it is highly expressed such as the skin. CYP2S1 is significantly overexpressed and, perhaps directly related to this, its gene is significantly hypometylated (see gene methylation in the skin of Han Chinese patients with psoriasis suggesting that it plays a role in the development of this disease.
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