Cited by 549Forensic and Genetic ResearchRace, Genetics, and SocietyGenetic diversity and population structure

Skin pigmentation, biogeographical ancestry and admixture mapping

Shriver, Mark D., Parra, Esteban J., Dios, Sonia, Bonilla, Carolina, Norton, Heather, Jovel, Celina, Pfaff, Carrie, Jones, Cecily +9 more·2003·Human Genetics

Abstract

Ancestry informative markers (AIMs) are genetic loci showing alleles with large frequency differences between populations. AIMs can be used to estimate biogeographical ancestry at the level of the population, subgroup (e.g. cases and controls) and individual. Ancestry estimates at both the subgroup and individual level can be directly instructive regarding the genetics of the phenotypes that differ qualitatively or in frequency between populations. These estimates can provide a compelling foundation for the use of admixture mapping (AM) methods to identify the genes underlying these traits. We present details of a panel of 34 AIMs and demonstrate how such studies can proceed, by using skin pigmentation as a model phenotype. We have genotyped these markers in two population samples with primarily African ancestry, viz. African Americans from Washington D.C. and an African Caribbean sample from Britain, and in a sample of European Americans from Pennsylvania. In the two African population samples, we observed significant correlations between estimates of individual ancestry and skin pigmentation as measured by reflectometry (R(2)=0.21, P<0.0001 for the African-American sample and R(2)=0.16, P<0.0001 for the British African-Caribbean sample). These correlations confirm the validity of the ancestry estimates and also indicate the high level of population structure related to admixture, a level that characterizes these populations and that is detectable by using other tests to identify genetic structure. We have also applied two methods of admixture mapping to test for the effects of three candidate genes (TYR, OCA2, MC1R) on pigmentation. We show that TYR and OCA2 have measurable effects on skin pigmentation differences between the west African and west European parental populations. This work indicates that it is possible to estimate the individual ancestry of a person based on DNA analysis with a reasonable number of well-defined genetic markers. The implications and applications of ancestry estimates in biomedical research are discussed.

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Crossref · 10.1007/s00439-002-0896-y

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  • Sex is a known confounder with skin pigmentation.

    “Sex is a known confounder with skin pigmentation 24 that was not explicitly matched for in selecting study participants; thus, it was also included as a covariate in logistic regression.”
  • The TYR SNP rs1042602 is highly polymorphic in all European populations, but previous studies found that this SNP was not significantly associated with skin-reflectance measurements in a white population.

    “In comparison, the TYR SNP rs1042602 is highly polymorphic in all European populations, but, despite its variability, previous studies found that this SNP was not significantly associated with skin-reflectance measurements in a white population.13,21,24,29”
  • A missense alteration in TYR, S192Y (rs1042602), is in linkage disequilibrium with the most significant SNP in GRM5 (rs10831496) in this sample.

    “a missense alteration in TYR, S192Y (rs1042602) [11] (Figure 4b), is in linkage disequilibrium with the most significant SNP in GRM5 (rs10831496) in this sample”
  • OCA2 was originally considered a strong candidate gene for Afro-European pigmentary variation based on allele distribution patterns of closely linked SNPs and because of a strong association with blue vs. brown eye color in populations of European ancestry.

    “OCA2 was originally considered a strong candidate gene for Afro-European pigmentary variation based on allele distribution patterns of closely linked SNPs [11], [14], [34], [35], and because of a strong association with blue vs. brown eye color in populations of European ancestry [4], [41].”
  • The same trend in M index was reported previously in a sample of European Americans.

    “The same trend in M index was reported previously in a sample of European Americans [38].”

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Authors
Shriver, M. D., Parra, E. J., Dios, S., Bonilla, C., Norton, H., Jovel, C., Pfaff, C., Jones, C., Massac, A., Cameron, N., Baron, A., Jackson, T., Argyropoulos, G., Jin, L., Hoggart, C. J., McKeigue, P. M., & Kittles, R. A.
Affiliations
  • Pennsylvania State University (US)
  • Howard University (US)
  • Pennington Biomedical Research Center (US)
  • London School of Hygiene & Tropical Medicine (GB)
Corresponding author
Shriver, Mark D.
Venue
Human Genetics
Published
2003-02-11
Volume
112
Issue
4
Pages
387-399
ISSN
  • 0018-7348 (ISSN-L)
  • 0340-6717
  • 1432-1203
OpenAlex
W1480933312
Cited by
549
References
52
Citations by year
2026: 4 · 2025: 13 · 2024: 11 · 2023: 13 · 2022: 14 · 2021: 15 · 2020: 15 · 2019: 21 · 2018: 16 · 2017: 19 · 2016: 17 · 2015: 27 · 2014: 31 · 2013: 19 · 2012: 23
FWCI
16.03
Type
journal article
Language
en
Open access
closed
Locations
  • Human Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • LSHTM Research Online (London School of Hygiene and Tropical Medicine) (submittedVersion)
Funders
  • Pennsylvania State University
  • National Institutes of Health (5r01mh060343-03)
  • National Institute of Mental Health (MH 60343)
  • National Human Genome Research Institute (R01HG002154, HG-002154)
  • National Center for Research Resources (M01 RR10732, M01RR010732)
  • NIH Clinical Center
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Race, Genetics, and Society
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
Keywords
skin pigmentation, ancestry informative markers, biogeographical ancestry, admixture mapping, African Americans, African Caribbeans, European Americans, population structure, TYR, OCA2, MC1R, reflectometry
MeSH terms
Africa, Black or African American, Carrier Proteins, Chromosome Mapping, Europe, United Kingdom, Humans, Membrane Proteins, Skin Pigmentation, Monophenol Monooxygenase, West Indies, Receptors, Corticotropin, Membrane Transport Proteins, Receptors, Melanocortin, Black People, White People

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