Skin pigmentation, biogeographical ancestry and admixture mapping.

Mark D Shriver¹, Esteban J Parra, Sonia Dios

¹Department of Anthropology, Penn State University, 409 Carpenter Bld., University Park, PA 16802, USA. mds17@psu.edu

|February 13, 2003

Summary

Ancestry informative markers (AIMs) enable accurate estimation of biogeographical ancestry. This study validates AIMs for skin pigmentation research and identifies genes influencing trait differences between populations.

Area of Science:

Genetics
Population Genetics
Human Ancestry

Background:

Ancestry informative markers (AIMs) exhibit significant allele frequency differences across populations.
AIMs facilitate the estimation of biogeographical ancestry at individual and subgroup levels.
Accurate ancestry estimation is crucial for understanding trait variations and genetic structure in diverse populations.

Purpose of the Study:

To validate a panel of 34 AIMs for estimating individual ancestry.
To investigate the relationship between estimated ancestry and skin pigmentation.
To apply admixture mapping to identify genes influencing skin pigmentation.

Main Methods:

Genotyping of 34 AIMs in African American, African Caribbean, and European American samples.
Measurement of skin pigmentation using reflectometry.
Application of admixture mapping to assess candidate genes (TYR, OCA2, MC1R).

Main Results:

Significant correlations found between estimated individual ancestry and skin pigmentation in African-descent samples (R²=0.21 and R²=0.16).
AIMs effectively detected population structure related to admixture.
Admixture mapping revealed that TYR and OCA2 genes significantly impact skin pigmentation differences.

Conclusions:

A panel of 34 AIMs can accurately estimate individual ancestry.
AIMs are valuable tools for biomedical research, particularly in studying phenotypes like skin pigmentation.
This study demonstrates the utility of AIMs and admixture mapping in identifying genes underlying population-specific traits.

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Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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