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Federal government websites often end in. The site is secure. Preview improvements coming to the PMC website in October Learn More or Try it out now. Performed the experiments: ZW KY. Analyzed the data: ZW KY. The population of Costa Rica CR represents an admixture of major continental populations. An investigation of the CR population structure would provide an important foundation for mapping genetic variants underlying common diseases and traits. Results from principal components analysis reveal a correlation between genetic and geographic distance.

We also show in a simulated association study conducted within the two subpopulations, that the failure to account for population stratification PS could lead to a noticeable inflation in the false positive rate. However, we further demonstrate that existing PS adjustment approaches can reduce the inflation to an acceptable level for gene discovery.

Costa Rica CR has a population of about 4 million people mainly comprising two self—described ethnic groups, known as Whites and Mestizos. The recent history of CR suggests that its present population originates from all three major continental populations, namely, Native American, European and African. Such gene flow and admixing scenario provides with a unique resource and a great potential for detecting genes underlying susceptibility to common diseases and traits [1]. The beauty of admixture mapping has been shown in many successful disease mapping projects [2] — [4].

Characterization and analysis of genetic composition of the CR population is critical for future genetic association studies, including genome-wide association studies, based on CR or similar admixed population.