A Method to Exploit the Structure of Genetic Ancestry Space to Enhance Case-Control Studies

Corneliu A. Bodea, Benjamin M. Neale, Stephan Ripke, International IBD Genetics Consortium, Mark J. Daly, Bernie Devlin, Kathryn Roeder (Lead / Corresponding author)

Research output: Contribution to journalArticle

6 Citations (Scopus)


One goal of human genetics is to understand the genetic basis of disease, a challenge for diseases of complex inheritance because risk alleles are few relative to the vast set of benign variants. Risk variants are often sought by association studies in which allele frequencies in case subjects are contrasted with those from population-based samples used as control subjects. In an ideal world we would know population-level allele frequencies, releasing researchers to focus on case subjects. We argue this ideal is possible, at least theoretically, and we outline a path to achieving it in reality. If such a resource were to exist, it would yield ample savings and would facilitate the effective use of data repositories by removing administrative and technical barriers. We call this concept the Universal Control Repository Network (UNICORN), a means to perform association analyses without necessitating direct access to individual-level control data. Our approach to UNICORN uses existing genetic resources and various statistical tools to analyze these data, including hierarchical clustering with spectral analysis of ancestry; and empirical Bayesian analysis along with Gaussian spatial processes to estimate ancestry-specific allele frequencies. We demonstrate our approach using tens of thousands of control subjects from studies of Crohn disease, showing how it controls false positives, provides power similar to that achieved when all control data are directly accessible, and enhances power when control data are limiting or even imperfectly matched ancestrally. These results highlight how UNICORN can enable reliable, powerful, and convenient genetic association analyses without access to the individual-level data.

Original languageEnglish
Pages (from-to)857-868
Number of pages12
JournalAmerican Journal of Human Genetics
Issue number5
Early online date14 Apr 2016
Publication statusPublished - 5 May 2016

Fingerprint Dive into the research topics of 'A Method to Exploit the Structure of Genetic Ancestry Space to Enhance Case-Control Studies'. Together they form a unique fingerprint.

  • Cite this

    Bodea, C. A., Neale, B. M., Ripke, S., International IBD Genetics Consortium, Daly, M. J., Devlin, B., & Roeder, K. (2016). A Method to Exploit the Structure of Genetic Ancestry Space to Enhance Case-Control Studies. American Journal of Human Genetics, 98(5), 857-868. https://doi.org/10.1016/j.ajhg.2016.02.025