RXRA rs11185644: Vitamin D Supplementation and Your Genetics
The rs11185644 variant is a single nucleotide polymorphism located near the RXRA gene. Research suggests this genetic marker may be associated with variations in how individuals respond to vitamin D3 supplementation.
What each genotype means
Variable vitamin D response
This genotype is associated with variations in how your body responds to vitamin D3 supplementation, particularly if you are a postmenopausal woman with overweight or obesity. Research indicates that this specific genetic marker may influence the dose-response relationship for serum 25(OH)D levels. Please discuss your vitamin D supplementation and blood level monitoring with your clinician or pharmacist.
This genotype is common, though exact frequency varies by ancestral background.
Variable vitamin D response
This genotype is associated with variations in how your body responds to vitamin D3 supplementation, particularly if you are a postmenopausal woman with overweight or obesity. Research indicates that this specific genetic marker may influence the dose-response relationship for serum 25(OH)D levels. Please discuss your vitamin D supplementation and blood level monitoring with your clinician or pharmacist.
This genotype is common, though exact frequency varies by ancestral background.
Variable vitamin D response
This genotype is associated with variations in how your body responds to vitamin D3 supplementation, particularly if you are a postmenopausal woman with overweight or obesity. Research indicates that this specific genetic marker may influence the dose-response relationship for serum 25(OH)D levels. Please discuss your vitamin D supplementation and blood level monitoring with your clinician or pharmacist.
This genotype is common, though exact frequency varies by ancestral background.
Understanding the rs11185644 Variant
The rs11185644 variant is a specific change in the DNA sequence, known as a single nucleotide polymorphism (SNP). It is situated in an intergenic region, meaning it lies in the space between genes rather than within a gene's coding sequence. Specifically, it is located approximately 7.5 kilobases upstream of the RXRA gene and about 24 kilobases from the 3' end of the uncharacterized LOC105376310 region. Because it is not located directly within the promoter or coding regions of a gene, scientists are still investigating how this specific location might influence biological processes. Genetic variants in non-coding regions are often studied for their potential role in regulating gene expression, though the exact mechanism for rs11185644 remains a subject of ongoing scientific inquiry.
The Role of the RXRA Gene
The RXRA gene encodes the Retinoid X Receptor Alpha protein. This protein acts as a nuclear receptor that plays a critical role in various biological pathways. A key function of RXRA is to form a heterodimer with the Vitamin D Receptor (VDR). When this complex binds to its ligand, it acts as a transcription factor, influencing the expression of numerous genes throughout the human genome. By regulating these genes, the RXRA-VDR complex helps control the body's response to vitamin D, which is essential for maintaining healthy serum levels of vitamin D metabolites. Because of this central role in vitamin D signaling, researchers often examine the RXRA gene when studying how genetic differences might affect an individual's ability to process or respond to vitamin D supplementation.
Research and Evidence Strength
The evidence linking rs11185644 to vitamin D response is considered moderate. A notable randomized clinical trial identified this SNP as being significantly associated with the dose-response variability to vitamin D3 supplementation, particularly in postmenopausal women with overweight or obesity. In this study, the Wald test for the association yielded a P-value of 1.01 × 10^-4, suggesting a statistical link between the variant and how serum 25(OH)D levels change following supplementation. However, it is important to note that this is a single-study finding. While the association is statistically significant within the context of that trial, further research across diverse populations and larger cohorts is necessary to confirm the robustness of this finding and to understand the underlying biological mechanisms involved.
Interpreting Your Genetic Information
It is important to understand that genetic associations are statistical observations made in research populations and do not serve as medical diagnoses. Having a specific genotype for rs11185644 does not guarantee a particular response to vitamin D supplements, as many factors—including diet, sun exposure, baseline health, and other genetic markers—influence vitamin D metabolism. You cannot use this information to determine your own vitamin D requirements or to make changes to your health regimen. If you are curious about your vitamin D levels or are considering supplementation, the most reliable approach is to consult with a healthcare professional or a registered dietitian. They can order appropriate blood tests to measure your actual serum levels and provide personalized guidance based on your unique health needs and clinical history.
How common is this variant?
The rs11185644 variant is considered a common genetic marker. Specific frequency data varies by ancestry, but it is generally observed across diverse human populations.
Frequently asked questions
Does my rs11185644 genotype mean I am vitamin D deficient?
No. This genetic variant is associated with how your body might respond to supplementation in a research setting, not with your current vitamin D status. A blood test ordered by your doctor is the only way to determine if you are deficient.
Should I change my vitamin D dose based on this SNP?
You should never change your supplement dosage based on genetic information alone. Always discuss your vitamin D levels and any potential supplementation with your healthcare provider or pharmacist.
Is rs11185644 a well-established genetic marker?
The association between rs11185644 and vitamin D response is based on moderate evidence from specific clinical trials. It is not currently used in routine clinical practice or standard medical care.
Where can I find more information about RXRA and vitamin D?
You can search for peer-reviewed studies on PubMed or review information provided by reputable health organizations. Always prioritize information from scientific databases over general internet searches.
Sources & further reading
Educational information only, last refreshed 10/17/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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