MC1R rs1805009: What Your Genotype Means
The rs1805009 variant is a specific change in the MC1R gene that is strongly associated with red hair, fair skin, and poor tanning ability. It is one of several well-studied genetic markers that influence human pigmentation by altering the function of the melanocortin 1 receptor.
What each genotype means
Increased melanoma risk
This genotype is associated with an increased risk of melanoma and basal cell carcinoma. The variant may reduce the production of protective dark melanin and increase lighter pheomelanin, which can make skin more vulnerable to UV damage regardless of your visible hair or skin color.
This genotype is less common than the wild-type and is primarily observed in populations of European ancestry.
Red hair carrier
Carrying one copy of this variant is associated with a likely increased risk of melanoma and basal cell carcinoma compared to those without the variant. This genotype is also linked to red hair traits, as the variant can favor lighter pigment production over darker eumelanin.
This heterozygous genotype is found in individuals of European descent, often associated with red hair carrier status.
Typical risk profile
This is the common, wild-type genotype for this position in the MC1R gene. It is not associated with the increased risk of melanoma or the red hair phenotype linked to the C allele.
This is the most common genotype observed in the general population across most ancestries.
Understanding the rs1805009 Variant
The rs1805009 variant, often referred to as D294H or Asp294His, is a single nucleotide polymorphism (SNP) located within the MC1R gene on chromosome 16. In genetic terms, this variant involves a substitution where the DNA base guanine (G) is replaced by cytosine (C). This specific change alters the amino acid sequence of the resulting protein. Because the MC1R gene is critical for determining how skin and hair cells produce pigment, changes at this location can have a noticeable impact on an individual's physical appearance. Researchers track this variant because it serves as a key indicator for the 'red hair color' (RHC) trait, which is characterized by a shift in pigment production toward lighter, reddish-yellow tones rather than darker, brown-black tones.
The Role of the MC1R Gene
The MC1R gene provides the instructions for building the melanocortin 1 receptor, a protein found on the surface of melanocytes—the cells responsible for producing melanin. This receptor acts like a switch; when activated by specific hormones, it signals the cell to produce eumelanin, the dark pigment that protects skin from ultraviolet (UV) radiation. When the MC1R gene contains variants like rs1805009, the receptor may not function as efficiently. This leads to a decrease in eumelanin production and an increase in pheomelanin, the pigment associated with red hair and lighter skin. Because this receptor is essential for the body's natural response to sun exposure, variations in this gene are frequently studied in the context of skin health and the body's ability to tan.
Research and Associations
Scientific research has consistently linked rs1805009 to the red hair phenotype and fair skin. Studies, including those involving populations in Ireland and the Netherlands, have identified this variant as a significant contributor to these traits. Beyond pigmentation, the variant is often discussed in relation to skin cancer risk. Because individuals with certain MC1R variants produce less protective eumelanin, they may be more susceptible to UV-induced skin damage. While some studies suggest an increased risk of melanoma for those carrying RHC variants, the evidence can be complex and sometimes varies by population. It is important to note that while genetic associations are strong, they are statistical in nature and do not guarantee a specific health outcome. Environmental factors, such as sun exposure habits, play a major role in skin health.
Population Frequency
The frequency of the rs1805009 variant varies significantly across different global populations. It is most commonly observed in individuals of Northern European descent, where it contributes to the prevalence of red hair and fair skin. In these populations, the variant is well-documented in genetic databases. Conversely, the variant is much less common or absent in many other ancestral groups. Because pigmentation traits are polygenic—meaning they are influenced by many different genes working together—the presence of this single variant does not always result in red hair. Its impact depends on the presence of other MC1R variants and the overall genetic background of the individual.
What This Information Means for You
Knowing your genotype for rs1805009 can provide insight into your genetic predisposition for certain physical traits like hair and skin color. However, it is important to view this information as a piece of a much larger puzzle. Genetic variants are not diagnostic tools; they simply indicate a statistical likelihood for certain traits or risks. If you are concerned about skin health, melanoma risk, or the impact of your genetics on your health, the most effective step is to consult with a dermatologist or a qualified healthcare provider. They can provide personalized advice based on your medical history and physical examination, which are far more informative than a single genetic marker. Always discuss any health-related concerns or potential risks with a professional rather than relying solely on genetic data.
How common is this variant?
The rs1805009 variant is most prevalent in Northern European populations, with an estimated frequency of approximately 10%.
Frequently asked questions
Does having the rs1805009 variant mean I will have red hair?
Not necessarily. While rs1805009 is associated with red hair, the trait is complex and often requires the presence of multiple MC1R variants. Many people carry this variant without having red hair.
Is rs1805009 a cause of skin cancer?
The variant is associated with fair skin and a reduced ability to tan, which are risk factors for skin damage. However, it is not a direct cause of cancer; environmental factors like sun exposure are the primary drivers.
Can I change my MC1R genotype?
No, your genotype is determined at conception and cannot be changed. It is a permanent part of your genetic code.
Should I get tested for this variant?
Genetic testing for pigmentation traits is generally for personal interest. If you have concerns about your skin health or melanoma risk, you should speak with a dermatologist.
Sources & further reading
Educational information only, last refreshed 10/2/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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The p.Arg163Gln variant in MC1R is associated with red hair, fair skin, and increased melanoma risk.
This missense variant (p.Arg160Trp) is a primary genetic determinant of red hair color, pale skin, and increased freckling in European populations.
This missense variant (p.Arg142His) is a well-established, highly penetrant allele associated with red hair color and fair skin pigmentation.
The Val60Leu missense variant in MC1R is a well-documented factor contributing to the red hair, fair skin, and freckling phenotype.
A rare variant associated with lighter skin pigmentation in specific populations.
Asp294His coding substitution in the MC1R gene associated with red hair, skin sun-sensitivity, and melanoma risk.