HFE rs1800560: What Your Genotype Means
The rs1800560 variant, commonly known as H63D, is a genetic change in the HFE gene that influences how the body regulates iron absorption. It is frequently studied for its association with hereditary hemochromatosis and a mild risk of iron overload, particularly when combined with other genetic factors.
What each genotype means
Typical iron metabolism
This genotype represents the most common form of the HFE gene, often referred to as the wild-type. Individuals with this profile do not carry the H63D variant and are considered to have a baseline genetic risk profile regarding HFE-related iron overload.
Carried by the majority of the population, though frequencies vary by ancestry.
H63D carrier
You carry one copy of the H63D variant. Research indicates that carrying a single copy of this variant does not typically result in a significant or predictable risk of iron overload, and it is considered very unlikely to cause clinical disease on its own.
The H63D allele frequency ranges between 10% and 20% in European populations, making this heterozygous genotype relatively common.
H63D homozygous
You carry two copies of the H63D variant. While this genotype is associated with a higher risk of iron overload compared to those without the variant, the penetrance is low, and clinically significant iron overload remains rare in this group.
This genotype is less common than the heterozygous state, occurring in a small percentage of the population depending on ethnic background.
Understanding the rs1800560 Variant
The rs1800560 variant is a single nucleotide polymorphism (SNP) located within the HFE gene on chromosome 6. In scientific literature, this specific change is often referred to as H63D, which describes the substitution of the amino acid histidine with aspartic acid at position 63 of the HFE protein. This variant is one of the most commonly investigated genetic markers in the context of iron metabolism. Because it is found in a significant portion of the general population, it is classified as a polymorphism rather than a rare mutation. Researchers track this variant to understand how subtle changes in protein structure can influence physiological processes, such as the body's ability to sense and regulate iron levels in the blood and tissues.
The Role of the HFE Gene
The HFE gene provides instructions for making the hemochromatosis protein, which plays a critical role in maintaining iron homeostasis. This protein is primarily found on the surface of cells in the small intestine and other tissues, where it interacts with the transferrin receptor to monitor iron levels. By regulating this interaction, the HFE protein helps control the amount of iron absorbed from the diet. When the HFE gene functions normally, it prevents the body from absorbing too much iron. However, certain variants in this gene can impair the protein's ability to regulate iron uptake. This can lead to an increase in iron absorption, which, over time, may result in the accumulation of excess iron in organs such as the liver, heart, and pancreas, a condition known as hereditary hemochromatosis.
Research and Clinical Associations
Research into rs1800560 has shown that its association with iron overload is complex and often depends on other genetic factors. While the C282Y variant in the HFE gene is the primary driver of most hereditary hemochromatosis cases, the H63D (rs1800560) variant is considered a lower-penetrance risk factor. Individuals who carry one copy of the C282Y variant and one copy of the H63D variant—a state known as compound heterozygosity—may have an increased risk of developing iron overload compared to the general population, though the clinical severity is often milder than in those with two copies of the C282Y variant. It is important to note that the presence of the H63D variant alone does not guarantee the development of iron overload, as environmental factors and other genetic modifiers play significant roles in determining clinical outcomes.
Population Frequency
The frequency of the rs1800560 variant varies significantly across different global populations. It is most prevalent in individuals of European ancestry, where the minor allele frequency is approximately 0.15. In some studies, such as those conducted on ethnic Danish cohorts, the allele frequency has been reported as high as 12.8%. Because of this relatively high frequency, a significant number of people carry at least one copy of the variant. In contrast, the variant is found at lower frequencies in many other populations, including those of African, Asian, and Middle Eastern descent. These differences in distribution highlight the importance of considering ancestral background when interpreting the potential health implications of this genetic variant in a clinical or research setting.
What You Can Do With This Information
Genetic information regarding the rs1800560 variant should be viewed as a piece of a larger health puzzle rather than a definitive medical diagnosis. If you have received results indicating you carry this variant, it is important to understand that it does not necessarily mean you will develop iron overload or hemochromatosis. Many people with this genotype never experience clinical symptoms. If you are concerned about your iron levels, the most appropriate step is to consult with a healthcare provider. They can order standard blood tests, such as serum ferritin and transferrin saturation, which are the gold standards for assessing iron status. Never attempt to self-diagnose or alter your diet based solely on genetic data. Always discuss your results with a qualified clinician who can interpret them in the context of your personal and family medical history.
How common is this variant?
The rs1800560 variant is common in European populations, with a minor allele frequency of approximately 0.15, while it appears at lower frequencies in other global populations.
Frequently asked questions
Does having the H63D variant mean I have hemochromatosis?
No, having the H63D variant does not mean you have hemochromatosis. It is a common genetic variation that may increase the risk of iron overload, but most people with this variant do not develop clinical disease.
Should I change my diet if I have the H63D variant?
You should not make significant dietary changes based on your genotype alone. Consult with a doctor or a registered dietitian to determine if your iron levels require any specific dietary adjustments based on blood test results.
How can I check if this variant is affecting my iron levels?
The best way to assess your iron status is through blood tests ordered by a healthcare professional, such as serum ferritin and transferrin saturation. These tests provide a direct measurement of how much iron is in your body.
Is the H63D variant the same as the C282Y variant?
No, H63D and C282Y are two different variants in the HFE gene. C282Y is more strongly associated with hereditary hemochromatosis, while H63D is considered a milder risk factor.
Sources & further reading
Educational information only, last refreshed 9/21/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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The Ser65Cys missense polymorphism in HFE linked to mild systemic iron regulation changes and downstream impacts on hypogonadotropic reproductive function.
The C282Y missense variant in HFE is the primary genetic cause of hereditary hemochromatosis, leading to iron overload.
HFE p.His63Asp (H63D) variant contributing to hereditary hemochromatosis risk, especially in compound heterozygosity with C282Y.
Coding variant (p.Val162Met) in the homeostatic iron regulator gene studied alongside classical hemochromatosis variants.
Known as HFE S65C (c.193A>T), this missense variant is associated with mild variations in transferrin saturation and iron accumulation, often evaluated alongside C282Y and H63D.
The H63D missense variant in HFE, associated with mild iron overload phenotypes.