Predicting the influence of common variants.

An ever-larger proportion of the liability to common and complex disease can be obtained by progressively larger studies. However, for most diseases, the sample sizes required to gain usable predictions will be out of reach of sequencing technologies for the foreseeable future. Array-based genotyping genome-wide association studies(GWAS) still offer a reliable harvest of biological hypotheses for many diseases, together with the secondary benefit of slowly improving prediction.