Oct 19, 2007

A second generation human haplotype map of over 3.1 million SNPs

Nature
International HapMap ConsortiumJohn Stewart

Abstract

We describe the Phase II HapMap, which characterizes over 3.1 million human single nucleotide polymorphisms (SNPs) genotyped in 270 individuals from four geographically diverse populations and includes 25-35% of common SNP variation in the populations surveyed. The map is estimated to capture untyped common variation with an average maximum r2 of between 0.9 and 0.96 depending on population. We demonstrate that the current generation of commercial genome-wide genotyping products captures common Phase II SNPs with an average maximum r2 of up to 0.8 in African and up to 0.95 in non-African populations, and that potential gains in power in association studies can be obtained through imputation. These data also reveal novel aspects of the structure of linkage disequilibrium. We show that 10-30% of pairs of individuals within a population share at least one region of extended genetic identity arising from recent ancestry and that up to 1% of all common variants are untaggable, primarily because they lie within recombination hotspots. We show that recombination rates vary systematically around genes and between genes of different function. Finally, we demonstrate increased differentiation at non-synonymous, compared to synonymous, SN...Continue Reading

  • References57
  • Citations2074

References

  • References57
  • Citations2074

Citations

Mentioned in this Paper

Dysequilibrium Syndrome
Recombination, Genetic
Cell Differentiation Process
Linkage Disequilibrium
Single Nucleotide Polymorphism
Genetic Linkage
Genotype Determination
Selection, Genetic

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