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Plant Methods. 2013 Jul 22;9:29. doi: 10.1186/1746-4811-9-29. eCollection 2013.

The advantages and limitations of trait analysis with GWAS: a review.

Author information

1
Gregor Mendel Institute of Molecular Plant Biology, Vienna, Austria.
#
Contributed equally

Abstract

Over the last 10 years, high-density SNP arrays and DNA re-sequencing have illuminated the majority of the genotypic space for a number of organisms, including humans, maize, rice and Arabidopsis. For any researcher willing to define and score a phenotype across many individuals, Genome Wide Association Studies (GWAS) present a powerful tool to reconnect this trait back to its underlying genetics. In this review we discuss the biological and statistical considerations that underpin a successful analysis or otherwise. The relevance of biological factors including effect size, sample size, genetic heterogeneity, genomic confounding, linkage disequilibrium and spurious association, and statistical tools to account for these are presented. GWAS can offer a valuable first insight into trait architecture or candidate loci for subsequent validation.

KEYWORDS:

Arabidopsis; Effect size; GWAS; Genetic heterogeneity; Mixed model

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