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Interrogating a high-density SNP map for signatures of natural selection
Joshua M Akey1, Ge Zhang, Kun Zhang
1Center for Genome Information, University of Cincinnati, Cincinnati, Ohio, USA.
Genome Research
|December 6, 2002
Summary
Researchers identified 174 candidate genes showing evidence of natural selection in the human genome. This study provides a foundational map of natural selection, revealing its impact on human genetic variation.
Area of Science:
- Genetics
- Human Evolution
- Population Genetics
Background:
- Identifying genomic regions influenced by natural selection is crucial in genetics.
- Understanding human genetic variation requires pinpointing targets of evolutionary pressures.
Purpose of the Study:
- To analyze single nucleotide polymorphisms (SNPs) across three populations to detect signatures of natural selection.
- To create a first-generation natural selection map of the human genome.
Main Methods:
- Analysis of 26,530 single nucleotide polymorphisms (SNPs) and their allele frequencies in three human populations.
- Calculation and examination of the distribution of genetic differentiation (F(ST)) across the genome, chromosomes, and individual genes.
- Contrasting individual SNP F(ST) values with the genome-wide distribution to mitigate demographic history assumptions.
Main Results:
- Statistically significant evidence indicates that natural selection has shaped current human genetic variation.
- Identification of 174 candidate genes exhibiting genetic variation patterns consistent with selection.
- Development of a genome-wide F(ST) distribution for robust natural selection inference.
Conclusions:
- Natural selection has demonstrably influenced human genomic variation.
- The identified candidate genes represent key targets of selection.
- This research establishes a foundational map for future studies on human evolution and genetic diversity.