Cited by 257melanin and skin pigmentationGenetic Associations and EpidemiologyCutaneous Melanoma Detection and Management

Interactive effects of MC1R and OCA2 on melanoma risk phenotypes

Duffy, D. L.·2003·Human Molecular Genetics

Abstract

The relationships between MC1R gene variants and red hair, skin reflectance, degree of freckling and nevus count were investigated in 2331 adolescent twins, their sibs and parents in 645 twin families. Penetrance of each MC1R variant allele was consistent with an allelic model where effects were multiplicative for red hair but additive for skin reflectance. Of nine MC1R variant alleles assayed, four common alleles were strongly associated with red hair and fair skin (Asp84Glu, Arg151Cys, Arg160Trp and Asp294His), with a further three alleles having low penetrance (Val60Leu, Val92Met and Arg163Gln). These variants were separately combined for the purposes of this analysis and designated as strong 'R' (OR=63.3; 95% CI 31.9-139.6) and weak 'r ' (OR=5.1; 95% CI 2.5-11.3) red hair alleles. Red-haired individuals are predominantly seen in the R/R and R/r groups with 67.1 and 10.8%, respectively. To assess the interaction of the brown eye color gene OCA2 on the phenotypic effects of variant MC1R alleles we included eye color as a covariate, and also genotyped two OCA2 SNPs (Arg305Trp and Arg419Gln), which were confirmed as modifying eye color. MC1R genotype effects on constitutive skin color, freckling and mole count were modified by eye color, but not genotype for these two OCA2 SNPs. This is probably due to the association of these OCA2 SNPs with brown/green not blue eye color. Amongst individuals with a R/R genotype (but not R/r), those who also had brown eyes had a mole count twice that of those with blue eyes. This suggests that other OCA2 polymorphisms influence mole count and remain to be described.

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Crossref · 10.1093/hmg/ddh043

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Authors
Duffy, D. L.
Affiliations
QIMR Berghofer Medical Research Institute (AU)
Corresponding author
Duffy, D. L.
Venue
Human Molecular Genetics
Published
2003-12-17
Volume
13
Issue
4
Pages
447-461
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2127998528
Cited by
257
References
91
Citations by year
2026: 4 · 2025: 3 · 2024: 6 · 2023: 2 · 2022: 4 · 2021: 8 · 2020: 6 · 2019: 14 · 2018: 11 · 2017: 8 · 2016: 11 · 2015: 5 · 2014: 15 · 2013: 16 · 2012: 16
FWCI
4.62
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (R01CA088363, CA88363)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Health Sciences › Medicine › Oncology › Cutaneous Melanoma Detection and Management
Keywords
MC1R, OCA2, melanoma risk, red hair, skin reflectance, freckling, nevus count, eye color, gene-gene interaction, melanin pigmentation
MeSH terms
Adolescent, Alleles, Eye Color, Hair Color, Humans, Mutation, Phenotype, Skin Pigmentation, Twins, Genetic Variation, Genetic Predisposition to Disease, Membrane Transport Proteins, Receptor, Melanocortin, Type 1

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