SELENOP encodes selenoprotein P, a liver-produced glycoprotein that carries multiple selenium-containing amino acids (selenocysteines) through the bloodstream to tissues. Biochemically it is classified as a selenoprotein and is central to maintaining body selenium availability for other selenium-dependent enzymes. The rs3877899 site is a single nucleotide polymorphism (SNP) in the SELENOP gene that has been studied in population research for its effects on circulating selenoprotein P and selenium biomarkers. Functionally, selenoprotein P supports delivery of selenium to organs and contributes to redox balance by enabling the activity of selenium-dependent antioxidant enzymes.

Different genotypes at rs3877899 have been associated with variation in circulating selenoprotein P and in markers of selenium status. Lower circulating selenoprotein P or genotypes linked to reduced SELENOP output may be associated with reduced selenium delivery to tissues and potential reductions in activity of selenium-dependent antioxidant pathways. Higher circulating selenoprotein P or genotypes associated with greater SELENOP production may reflect better selenium transport but can also indicate altered selenium distribution. Interpretation is most reliable when combined with dietary history, direct selenium measurements, and the Cellular Zoomer’s oxidative stress and nutrient markers, since genotype alone does not determine current selenium status or antioxidant function.

SELENOP (rs3877899) is included in the Cellular Zoomer to link inherited antioxidant capacity with measured oxidative damage and nutrient markers. It helps providers see whether genetic variation in selenium transport aligns with current selenium biomarkers, redox signals, and cellular stress patterns, improving personalization of assessments and monitoring.