VDR rs11568828: Understanding the Cdx-2 Promoter Polymorphism
The rs11568828 variant is a genetic marker located within the VDR gene, which encodes the vitamin D receptor. It is frequently studied alongside the Cdx-2 promoter polymorphism (rs11568820) for its potential influence on how the body processes vitamin D and its association with various health conditions.
What each genotype means
Enhanced VDR promoter activity
You carry two copies of the A allele in the VDR Cdx-2 promoter region, which has been shown in molecular studies to bind the CDX2 transcription factor with higher affinity and increase receptor transcription compared to the G allele. In epidemiological research, this genotype has been linked to slightly higher bone mineral density and altered colorectal cancer risk, although overall clinical evidence remains modest and conflicting across different populations. Because this variant confers a health predisposition rather than a direct diagnosis, lifestyle factors like dietary calcium and vitamin D status remain primary influences on your bone and bowel health.
Carried by approximately 55% to 70% of individuals of European ancestry, but less frequent in East Asian populations where it occurs in roughly 25% to 35% of individuals.
Intermediate VDR promoter activity
You carry one A allele and one G allele in the VDR Cdx-2 promoter region, resulting in intermediate transcriptional efficiency of the vitamin D receptor. Studies evaluating bone mineral density and colorectal cancer susceptibility show intermediate or mixed risk profiles for heterozygous carriers relative to homozygotes. Findings across various ancestral cohorts are variable and limited, meaning this genotype alone does not determine your clinical bone health or cancer risk.
Found in approximately 25% to 35% of individuals of European ancestry and roughly 45% to 50% of East Asian populations.
Reduced VDR promoter activity
You carry two copies of the G allele in the VDR Cdx-2 promoter region, which is associated with lower CDX2 binding affinity and approximately 70% reduced basal transcriptional activity in experimental assays compared to the A allele. In some observational cohorts, this genotype has been associated with lower bone mineral density and altered susceptibility to colorectal neoplasms, though epidemiological findings remain limited and contradictory across different ethnic groups. This genetic variation represents a subtle predisposition and does not establish a clinical condition.
Observed in roughly 2% to 5% of European populations, but much more prevalent in East Asian populations where it occurs in approximately 15% to 25% of individuals.
What is the VDR Gene?
The VDR gene provides the essential instructions for creating the vitamin D receptor protein. This receptor acts as a transcription factor, meaning it binds to vitamin D and then attaches to specific regions of DNA to turn genes on or off. By regulating gene expression, the vitamin D receptor plays a critical role in maintaining calcium balance, supporting bone health, and modulating immune system function. Because vitamin D is involved in so many physiological processes, researchers often investigate variations in the VDR gene to see if they contribute to differences in how individuals respond to vitamin D levels or their susceptibility to certain chronic diseases.
Understanding the Variant
The variant rs11568828 is a single nucleotide polymorphism (SNP) found within the VDR gene region. It is often discussed in the context of the Cdx-2 promoter polymorphism (rs11568820), which is located in the 5'-untranslated region of the gene. Research suggests that variations in this promoter region may influence the transcriptional activity of the VDR gene, potentially altering the amount of receptor protein produced. While some studies have explored whether these changes affect bone mineral density or the risk of conditions like colorectal cancer, the scientific evidence remains mixed. Because the VDR gene is complex and interacts with many environmental factors, such as dietary intake of calcium and vitamin D, it is difficult to isolate the specific impact of this single variant on overall health outcomes.
Research and Evidence Strength
Scientific investigations into rs11568828 and its linked variants have yielded inconsistent results across different populations. While some studies have suggested potential associations with bone metabolism or cancer risk, others have found no significant link after adjusting for multiple comparisons or accounting for environmental variables. For instance, large-scale studies on colorectal cancer have often failed to find an independent association between these specific VDR polymorphisms and disease risk. Furthermore, the influence of these variants appears to be highly dependent on ancestry and lifestyle factors. Consequently, the current evidence strength for this variant as a predictor of health outcomes is considered limited. It is important to view these findings as statistical observations in research cohorts rather than definitive indicators of personal health risk.
Population Frequency
The frequency of alleles associated with this VDR region varies significantly depending on an individual's ancestral background. For example, the A allele frequency for the linked Cdx-2 polymorphism has been observed at approximately 19% in non-Hispanic white populations, while it reaches as high as 76% in African American populations. These differences highlight the importance of considering genetic diversity when interpreting research findings. Because these frequencies are not uniform globally, a result observed in one population may not necessarily apply to another. Researchers use these frequency data to better understand the evolutionary history of the VDR gene and to ensure that genetic studies are representative of diverse groups.
What This Information Means for You
Genetic information regarding the VDR gene is primarily used for research purposes and does not provide a diagnostic tool for personal health. Because the association between rs11568828 and health outcomes is not well-established or consistent, it cannot be used to predict your individual risk for specific diseases or to determine your optimal vitamin D intake. If you have concerns about your vitamin D levels, bone health, or general wellness, the most effective approach is to consult with a healthcare professional. They can order appropriate blood tests to measure your actual vitamin D levels and provide guidance based on your clinical history, rather than relying on genetic markers that have limited predictive power. Always discuss any changes to your diet, supplements, or health regimen with your doctor or a qualified pharmacist.
How common is this variant?
The frequency of the A allele varies significantly by ancestry, ranging from approximately 19% in non-Hispanic whites to 76% in African Americans.
Frequently asked questions
Can this genetic variant tell me if I have a vitamin D deficiency?
No, this variant cannot diagnose a vitamin D deficiency. Vitamin D levels are primarily determined by environmental factors like sun exposure, diet, and supplement use, which are far more influential than this specific genetic marker.
Should I take more vitamin D if I have this genotype?
You should not change your vitamin D intake based on this genotype. Please consult your healthcare provider to have your blood levels tested, as they can provide personalized recommendations based on your actual physiological needs.
Is this variant linked to a higher risk of cancer?
Research on this topic is inconsistent and inconclusive. While some studies have explored potential links, there is no strong evidence to suggest that this variant is a reliable predictor of cancer risk for the general population.
Why do different populations have such different frequencies for this variant?
Genetic variation often reflects the evolutionary history and environmental adaptations of different ancestral groups. These differences are common across the human genome and do not necessarily imply differences in overall health or fitness.
Sources & further reading
Educational information only, last refreshed 10/18/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Variant in the promoter region (Cdx2 site) of the vitamin D receptor gene associated with altered intestinal calcium absorption and bone mineral density.
This variant in the Vitamin D receptor gene is associated with susceptibility to Type 1 Diabetes and autoimmune thyroid disease.
Promoter polymorphism (Cdx2) in the VDR gene associated with bone mineral density and vitamin D metabolism.
Common polymorphism (TaqI variant) in the vitamin D receptor affecting mRNA stability and bone mineral density.
Known as the TaqI polymorphism, this variant is located in the 3' UTR of the VDR gene and is associated with altered mRNA stability, influencing vitamin D signaling, cancer cachexia susceptibility, and gastric cancer risk.
Variant in the VDR promoter (Cdx-2 binding site) associated with bone mineral density and calcium absorption efficiency.