Allele frequency matching between SNPs reveals an excess of linkage disequilibrium in genic regions of the human genome.

Abstract:

:Significant interest has emerged in mapping genetic susceptibility for complex traits through whole-genome association studies. These studies rely on the extent of association, i.e., linkage disequilibrium (LD), between single nucleotide polymorphisms (SNPs) across the human genome. LD describes the nonrandom association between SNP pairs and can be used as a metric when designing maximally informative panels of SNPs for association studies in human populations. Using data from the 1.58 million SNPs genotyped by Perlegen, we explored the allele frequency dependence of the LD statistic r(2) both empirically and theoretically. We show that average r(2) values between SNPs unmatched for allele frequency are always limited to much less than 1 (theoretical approximately 0.46 to 0.57 for this dataset). Frequency matching of SNP pairs provides a more sensitive measure for assessing the average decay of LD and generates average r(2) values across nearly the entire informative range (from 0 to 0.89 through 0.95). Additionally, we analyzed the extent of perfect LD (r(2) = 1.0) using frequency-matched SNPs and found significant differences in the extent of LD in genic regions versus intergenic regions. The SNP pairs exhibiting perfect LD showed a significant bias for derived, nonancestral alleles, providing evidence for positive natural selection in the human genome.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Eberle MA,Rieder MJ,Kruglyak L,Nickerson DA

doi

10.1371/journal.pgen.0020142

subject

Has Abstract

pub_date

2006-09-08 00:00:00

pages

e142

issue

9

eissn

1553-7390

issn

1553-7404

pii

06-PLGE-RA-0020R3

journal_volume

2

pub_type

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