GC rs16847015: What Your Genotype Means
The rs16847015 variant is a genetic marker located within the GC gene, which encodes the vitamin D-binding protein. Research has explored its potential association with physical fitness scores in children, though evidence remains limited.
What each genotype means
Baseline fitness association
This genotype represents the major allele homozygote for this variant. Research in a small cohort of children has suggested that individuals carrying the T allele (TG or GG genotypes) may show different physical fitness scores compared to those with the CC genotype, though the evidence for this association is limited and requires further validation in larger, diverse populations.
This is the most common genotype globally, though frequencies vary significantly by ancestry.
Potential fitness variation
As a heterozygote, you carry one copy of the T allele. Some research has observed that individuals with this genotype, alongside those with the GG genotype, may exhibit differences in physical fitness metrics compared to CC carriers, but this evidence is currently limited and not definitive.
This genotype is found at varying frequencies across global populations, appearing in a notable portion of the population.
Baseline fitness association
This genotype represents the minor allele homozygote for this variant. While some studies have explored the role of the GC gene in physical fitness, the specific association of the TT genotype remains limited in the literature, and it is generally considered a common variant without established clinical significance.
This genotype is less common than the CC genotype but is present in the general population.
Understanding the SNP and the GC Gene
The variant rs16847015 is a single nucleotide polymorphism (SNP) located in the GC gene on chromosome 4. The GC gene is responsible for producing the vitamin D-binding protein (DBP), a multifunctional protein that plays a critical role in transporting vitamin D and its metabolites throughout the body. Because vitamin D is essential for bone health, immune function, and muscle physiology, variations in the gene that encodes its primary carrier are of significant interest to researchers studying human health and performance. This specific SNP is located in an intronic region of the gene, meaning it does not directly alter the protein's amino acid sequence, but it may influence how the gene is regulated or expressed.
Research on Physical Fitness and Health
Scientific interest in rs16847015 has primarily focused on its potential link to physical fitness. One study involving Korean children identified a statistical association between the TG and GG genotypes of this variant and variations in physical fitness scores, which included measures of speed, endurance, and strength. While these findings suggest that the variant might be a useful index for predicting fitness-related outcomes or identifying individuals who might benefit from specific intervention programs, the evidence is currently limited. It is important to note that physical fitness is a complex trait influenced by a vast array of genetic, environmental, and lifestyle factors. A single SNP is unlikely to determine an individual's athletic potential or physical health on its own.
Interpreting the Evidence
The evidence linking rs16847015 to physical fitness is considered preliminary. In the context of genetic research, an association observed in one specific population—such as the group of children in the aforementioned study—does not necessarily mean the same effect will be observed in other populations or age groups. Furthermore, many genetic variants in the GC gene are studied for their role in vitamin D metabolism, but results can be inconsistent across different studies. Because the scientific community has not established a definitive, large-scale clinical impact for this specific variant, it is best viewed as a subject of ongoing research rather than a diagnostic tool. Always approach such findings with caution and recognize that genetic markers provide only a small piece of the broader health puzzle.
What You Can and Cannot Do With This Information
If you have information about your rs16847015 genotype, it is important to understand its limitations. You cannot use this information to diagnose a medical condition, predict your athletic future, or determine your vitamin D status. Genetic associations are statistical observations, not medical certainties. If you are concerned about your physical fitness, vitamin D levels, or overall health, the most effective approach is to consult with a healthcare professional or a registered dietitian. They can evaluate your health through validated clinical tests, such as blood work for vitamin D levels, and provide personalized guidance based on your lifestyle, diet, and medical history. Do not make changes to your health regimen based solely on a single genetic variant report.
How common is this variant?
The rs16847015 variant is considered common, though its specific allele frequencies vary significantly across different ancestral groups as documented in databases like gnomAD.
Frequently asked questions
Is rs16847015 a predictor of athletic ability?
No. While some research has found statistical associations between this variant and fitness scores in children, it is not a reliable predictor of athletic ability. Physical performance is influenced by hundreds of genes and significant environmental factors.
Does this variant affect my vitamin D levels?
The GC gene is involved in vitamin D transport, but there is no definitive evidence that rs16847015 significantly alters your vitamin D status. If you are concerned about your vitamin D levels, you should request a blood test from your doctor.
Should I change my diet based on this SNP?
No. You should not change your diet based on a single genetic variant. Nutritional needs are best determined by a healthcare provider or dietitian based on your overall health, blood markers, and lifestyle.
Is this variant considered a disease risk?
No. This variant is not classified as a disease-causing mutation. It is a common genetic variation that has been studied for its potential role in physiological traits, not as a marker for clinical disease.
Sources & further reading
Educational information only, last refreshed 10/31/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This common variant in the vitamin D-binding protein gene is a primary genomic predictor of circulating 25-hydroxyvitamin D levels and is associated with vitamin D deficiency risk.
Common missense variant Thr436Lys in the vitamin D binding protein gene strongly associated with reduced circulating serum 25-hydroxyvitamin D concentrations.
A common regulatory variant in the GC gene (encoding Vitamin D Binding Protein) associated with circulating 25-hydroxyvitamin D levels.
This intronic variant in the vitamin D binding protein gene influences circulating 25-hydroxyvitamin D concentrations.
One of the two primary SNPs in the Vitamin D Binding Protein gene that determines a person's Vitamin D status and transport efficiency.