rs33972313 SLC23A1
SLC23A1 variant. Significantly reduced vitamin C transport; lower plasma ascorbic acid levels.
What is rs33972313?
rs33972313 is a single-nucleotide polymorphism (SNP) in the SLC23A1 gene (Solute carrier family 23 member 1 (vitamin C transporter)). Each person carries two copies, one from each parent, so a result is reported as a pair of letters such as TT. The table below describes what studies associate with each genotype; the association is statistical, across populations, and is not a diagnosis.
What does each rs33972313 genotype mean?
| Genotype | Association | What the evidence says | Confidence |
|---|---|---|---|
| TT | increased | SLC23A1 variant. Significantly reduced vitamin C transport; lower plasma ascorbic acid levels. | 80% |
| CT / TC | increased | Reduced vitamin C absorption. May benefit from higher dietary intake. | 77% |
| CC | typical | Normal vitamin C transport and absorption. | 80% |
How common is the T allele of rs33972313?
Minor-allele frequency by population (gnomAD / 1000 Genomes):
| European | 5.0% |
|---|---|
| East Asian | 1.0% |
| African | 2.0% |
| South Asian | 3.0% |
| Admixed American | 4.0% |
| Global | 3.0% |
Is rs33972313 on 23andMe and AncestryDNA chips?
Yes — it is genotyped directly on 23andMe V4, 23andMe V5, AncestryDNA V2. Orviva reads it from a raw-data export without imputation.
Sources
Upload your 23andMe, AncestryDNA or WeGene raw file → · Ask G2: “What is my genotype at rs33972313 and what does it mean for me?”
Genetic associations describe risk across populations, not a diagnosis for any one person. Most variants shift risk modestly and act alongside lifestyle, environment and other genes. Consumer DNA chips do not read every position and can be wrong at any single one. For general education only; talk to a clinician or genetic counsellor before acting on anything here, and never change a prescribed medicine without your prescriber.