rs1805007 MC1R
MC1R R151C homozygous. Red hair, fair skin, freckling. Increased melanoma and skin cancer risk.
What is rs1805007?
rs1805007 is a single-nucleotide polymorphism (SNP) in the MC1R gene (Melanocortin 1 receptor). Each person carries two copies, one from each parent, so a result is reported as a pair of letters such as TT. The table below describes what studies associate with each genotype; the association is statistical, across populations, and is not a diagnosis.
What does each rs1805007 genotype mean?
| Genotype | Association | What the evidence says | Confidence |
|---|---|---|---|
| TT | typical / lower | MC1R R151C homozygous. Red hair, fair skin, freckling. Increased melanoma and skin cancer risk. | 88% |
| CT / TC | typical / lower | MC1R R151C carrier. May have reddish tones; increased sun sensitivity. | 82% |
| CC | typical / lower | Normal MC1R function. | 85% |
How common is the T allele of rs1805007?
Minor-allele frequency by population (gnomAD / 1000 Genomes):
| European | 10.0% |
|---|---|
| East Asian | 0.1% |
| African | 0.1% |
| South Asian | 0.5% |
| Admixed American | 4.0% |
| Global | 3.0% |
Is rs1805007 on 23andMe and AncestryDNA chips?
Yes — it is genotyped directly on 23andMe V3, 23andMe V4, 23andMe V5, AncestryDNA V1, AncestryDNA V2. Orviva reads it from a raw-data export without imputation.
Sources
Upload your 23andMe, AncestryDNA or WeGene raw file → · Ask G2: “What is my genotype at rs1805007 and what does it mean for me?”
Genetic associations describe risk across populations, not a diagnosis for any one person. Most variants shift risk modestly and act alongside lifestyle, environment and other genes. Consumer DNA chips do not read every position and can be wrong at any single one. For general education only; talk to a clinician or genetic counsellor before acting on anything here, and never change a prescribed medicine without your prescriber.