nutrition · Mechanism Report
Are GC rs2282679 CC, DHCR7 rs12785878 GG, and CYP2R1 rs10741657 AG associated with lower circulating 25-hydroxyvitamin D?
GC rs2282679 CC and DHCR7 rs12785878 GG are associated with lower circulating 25-hydroxyvitamin D, while CYP2R1 rs10741657 AG is a plausible but less genotype-resolved contributor.
This is what AI claimed
GC rs2282679 CC, DHCR7 rs12785878 GG, and CYP2R1 rs10741657 AG are associated with lower circulating 25-hydroxyvitamin D through effects on vitamin D binding, synthesis, or hydroxylation.
Executive summary
The claim says these vitamin D–related genotypes track with lower total circulating 25-hydroxyvitamin D, with the strongest evidence for GC rs2282679 CC and DHCR7 rs12785878 GG. The mechanism framing points to changes in vitamin D binding, synthesis, and hydroxylation, but the evidence is mainly about total 25(OH)D rather than a deterministic prediction of deficiency or free vitamin D. For CYP2R1 rs10741657 AG, the association is biologically plausible, but the genotype-specific evidence is less direct.
Verified conclusion
Vitamin D status is polygenic and strongly influenced by non-genetic factors. For these variants, evidence is most convincing for associations with total circulating 25-hydroxyvitamin D (25[OH]D), rather than a deterministic prediction of deficiency or of free/bioavailable vitamin D.
Clinical association evidence
- GC rs2282679 CC has the clearest genotype-specific evidence. In 443 Brazilian women, CC was associated with lower total 25(OH)D, lower vitamin-D-binding protein (DBP), and greater vitamin D deficiency prevalence (prevalence ratio 1.74, 95% CI 1.30–2.24). This agrees with replicated GWAS evidence at the GC locus.
- DHCR7 rs12785878 GG is supported by large-scale association data: in the SUNLIGHT meta-analysis of 33,996 European-ancestry participants, the variant was strongly associated with 25(OH)D (P=2.1×10⁻²⁷), directionally consistent with lower concentrations in GG. Results were not established in the retrieved South Asian evidence.
- CYP2R1 rs10741657 is robustly associated with serum 25(OH)D at the locus level, including in South Asian participants, but available evidence does not directly show that the AG genotype specifically produces lower 25(OH)D than a defined comparator.
Mechanistic interpretation
- GC: The binding explanation has direct support: CC is associated with lower serum DBP, the principal carrier of vitamin-D metabolites. Because most evidence measures total 25(OH)D, implications for free or bioavailable 25(OH)D remain less direct.
- DHCR7 and CYP2R1: Roles in vitamin-D production and hepatic 25-hydroxylation, respectively, are biologically coherent, but direct evidence that these specific genotypes alter cutaneous synthesis, gene expression, or enzyme activity is indirect.
Bottom line
- The overall claim is plausible: GC CC and DHCR7 GG are supported markers of lower total 25(OH)D, while CYP2R1 AG remains a plausible but incompletely genotype-resolved contributor. These variants inform susceptibility, not an individual clinical prediction.
References
- Prevalence of vitamin D deficiency in women from southern ... — pmc.ncbi.nlm.nih.gov
- Genome-wide association study of circulating vitamin D ... — pmc.ncbi.nlm.nih.gov
- Vitamin D Insufficiency in Arabs and South Asians Positively Associates with Polymorphisms in GC and CYP2R1 Genes — journals.plos.org
- Genome-wide association study of 25(OH) Vitamin D concentrations ... — pmc.ncbi.nlm.nih.gov
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