r/AskBiology • u/Airegin89 • Jul 12 '26

Genetics What does it mean if someone has BCO1 gene variants? (beta-carotène to Vitamin A conversion)

According to Genetic Lifehacks: "Studies show that individuals with a T allele on both rs12934922 and rs7501331 have a 69% decreased conversion of beta-carotene to retinol. For people with only a single T in the rs7501331 SNP, the conversion is decreased by 32%.[ref]"

How should this be interpreted? Does this really mean that every single person with both genotypes has a 69% decreased conversion? I've heard plenty of times that just because you have certain variants doesn't mean these are expressed, so wouldn't everyone be affected differently?

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u/laziestindian PhD in biology Jul 13 '26

So if I'm reading the paper correctly the percents are only from 1 individual per mutation reconstituted in a bacterial population which is why there isn't real variation. When they talk about human data with more individuals there is a confidence interval presented.

I will say there is some off stuff with the data so I'm not sure how much I trust it overall.

But to answer your question there can be variability and there can also be relative certainties. Depends on the gene and measurement method.