What is rs7501331 (BCO1) nd Why Does the Nutrient Zoomer Test for It?

Provitamin A conversion enzyme

rs7501331 is a genetic variant in the BCO1 gene, which encodes the enzyme that converts dietary provitamin A carotenoids into retinal. Variants at this site are linked to differences in how efficiently carotenoids are turned into vitamin A precursors, so testing it helps explain individual differences in carotenoid and vitamin A biomarkers.

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rs7501331 (BCO1)

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About rs7501331 (BCO1)

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About rs7501331 (BCO1)

Overview and History

rs7501331 is a single nucleotide variant located in the BCO1 gene, which encodes beta‑carotene oxygenase 1. BCO1 is a carotenoid‑cleaving enzyme that performs the biochemical step of converting dietary provitamin A carotenoids (like beta‑carotene) into retinal, a precursor to active vitamin A compounds. Genetic differences in BCO1 were identified as a source of variability in blood carotenoid and vitamin A–related measures across populations. Biochemically, BCO1 activity influences how much dietary carotenoid is retained in circulation versus processed into vitamin A metabolites, so variants can help explain interindividual differences in nutrient biomarker patterns.

Interpreting Highs and Lows

When testing indicates a BCO1 variant associated with reduced function, a common pattern is higher circulating provitamin A carotenoids and relatively lower converted vitamin A metabolites; this reflects less enzymatic conversion rather than a direct disease state. Conversely, genotypes associated with typical BCO1 function tend to show expected proportions of carotenoids and vitamin A biomarkers given the same dietary intake. Interpretation should always use the full Nutrient Zoomer report—dietary intake, blood carotenoid and retinol measures, liver markers, and other nutrient‑related genes all influence the final clinical picture.

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Nutrient Zoomer includes rs7501331 to evaluate an individual’s inherited capacity to convert dietary provitamin A carotenoids into vitamin A precursors. This genetic insight helps explain discordant blood carotenoid and vitamin A measures and supports more precise interpretation of nutrient status within the full panel.

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rs7501331 (BCO1) FAQs

What is rs7501331 (BCO1) and why is it important?

rs7501331 is a genetic variant in the BCO1 gene, which affects the enzyme that processes dietary provitamin A carotenoids into retinal. Because people differ in how well they convert carotenoids to vitamin A forms, this variant helps explain why two people with similar diets can show different carotenoid and vitamin A lab results. Knowing the genotype gives context when evaluating nutrient biomarkers.

What does it mean if my rs7501331 (BCO1) levels are low?

For this genetic marker, a result indicating reduced BCO1 function is often described as "low" activity. That pattern is commonly associated with higher blood carotenoid concentrations and relatively less converted vitamin A metabolite, reflecting less efficient enzymatic conversion. Such findings are meaningful when combined with dietary intake, measured vitamin A and carotenoid labs, and other genetic and metabolic data.

What does it mean if my rs7501331 (BCO1) levels are high?

A result consistent with higher or normal BCO1 function suggests typical conversion of provitamin A carotenoids into retinal. In that context, carotenoid and vitamin A biomarker ratios often reflect expected processing given dietary intake. Clinical interpretation requires the broader Nutrient Zoomer data—single genetic findings are one piece of the overall picture.

Why is rs7501331 (BCO1) included in the Nutrient Zoomer?

rs7501331 helps providers understand inherited differences in carotenoid‑to‑vitamin A conversion. Including this variant clarifies why blood carotenoid and vitamin A measures may not match dietary intake, improves interpretation of provitamin A status, and supports more personalized nutritional assessment within the panel.

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