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The diversity outbred mouse population

Abstract

The Diversity Outbred (DO) population is a heterogeneous stock derived from the same eight founder strains as the Collaborative Cross (CC) inbred strains. Genetically heterogeneous DO mice display a broad range of phenotypes. Natural levels of heterozygosity provide genetic buffering and, as a result, DO mice are robust and breed well. Genetic mapping analysis in the DO presents new challenges and opportunities. Specialized algorithms are required to reconstruct haplotypes from high-density SNP array data. The eight founder haplotypes can be combined into 36 possible diplotypes, which must be accommodated in QTL mapping analysis. Population structure of the DO must be taken into account here. Estimated allele effects of eight founder haplotypes provide information that is not available in two-parent crosses and can dramatically reduce the number of candidate loci. Allele effects can also distinguish chance colocation of QTL from pleiotropy, which provides a basis for establishing causality in expression QTL studies. We recommended sample sizes of 200–800 mice for QTL mapping studies, larger than for traditional crosses. The CC inbred strains provide a resource for independent validation of DO mapping results. Genetic heterogeneity of the DO can provide a powerful advantage in our ability to generalize conclusions to other genetically diverse populations. Genetic diversity can also help to avoid the pitfall of identifying an idiosyncratic reaction that occurs only in a limited genetic context. Informatics tools and data resources associated with the CC, the DO, and their founder strains are developing rapidly. We anticipate a flood of new results to follow as our community begins to adopt and utilize these new genetic resource populations.

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Acknowledgments

Development and maintenance of the DO has benefitted from the effort and expertise of Lisa Somes, Marge Strobel, Elissa Chesler, and Darla Miller and was supported with funding provided by The Jackson Laboratory. Riyan Cheng, Abraham Palmer, and William Valdar contributed to the development of analytical methods described here. Fernando Pardo-Manuel de Villena, Leonard McMillan, and Catherine Welsh at the University of North Carolina at Chapel Hill developed the MUGA array and associated software. Additional support was provided by NIH grants GM076468 and GM070683.

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Correspondence to Daniel M. Gatti.

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Churchill, G.A., Gatti, D.M., Munger, S.C. et al. The diversity outbred mouse population. Mamm Genome 23, 713–718 (2012). https://doi.org/10.1007/s00335-012-9414-2

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  • DOI: https://doi.org/10.1007/s00335-012-9414-2

Keywords

  • Inbred Strain
  • Allele Effect
  • Collaborative Cross
  • Founder Haplotype
  • Heterogeneous Stock