Towards systems genetic analyses in barley: Integration of phenotypic, expression and genotype data into GeneNetwork

Arnis Druka, Ilze Druka, Arthur G Centeno, Hongqiang Li, Zhaohui Sun, William TB Thomas, Nicola Bonar, Brian J Steffenson, Steven E Ullrich, Andris Kleinhofs, Roger P Wise, Timothy J Close, Elena Potokina, Zewei Luo, Carola Wagner, Günther F Schweizer, David F Marshall, Michael J Kearsey, Robert W Williams, Robbie Waugh

A typical genetical genomics experiment results in four separate data sets; genotype, gene expression, higher-order phenotypic data and metadata that describe the protocols, processing and the array platform. Used in concert, these data sets provide the opportunity to perform genetic analysis at a systems level. Their predictive power is largely determined by the gene expression dataset where tens of millions of data points can be generated using currently available mRNA profiling technologies. Such large, multidimensional data sets often have value beyond that extracted during their initial analysis and interpretation, particularly if conducted on widely distributed reference genetic materials. Besides quality and scale, access to the data is of primary importance as accessibility potentially allows the extraction of considerable added value from the same primary dataset by the wider research community. Although the number of genetical genomics experiments in different plant species is rapidly increasing, none to date has been presented in a form that allows quick and efficient on-line testing for possible associations between genes, loci and traits of interest by an entire research community.