14-ERASynBio - IESY - Inducible Evolution of Synthetic Yeast genomes

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Induced Evolution of Synthetic Yeast genomes (IESY) will use the first synthetic eukaryote, Saccharomyces cerevisiae 2.0 (Sc2.0), as a platform for metabolic engineering and genome minimization, and more importantly for generating and understanding industrially high-value phenotypes. Synthetic chromosomes in Sc2.0 permit rapid and comprehensive genome evolution through synthetic chromosome rearrangement and modification by loxP-mediated evolution (SCRaMbLE). SCRaMbLE will be exploited here to evolve strains selected for high-value phenotypes for biofuels and biotechnology, using both chemostats and batch transfer methods in the USA and Europe. Technologies for neochromosomes and orthogonal SCRaMbLE of gene classes will be developed. Evolutionary trajectories will be analysed to relate genome structure with genome function: DNA sequencing will reveal the genome sequence, rearrangements, and copy number changes in the evolved strains; chromosome conformation capture will show how massive rearrangements affect 3D structure; and deep sequencing technologies will relate sequence and structure to gene expression and isoform abundance. Computational analysis will identify the evolutionary drivers for high fitness, with the potential for further optimization. IESY builds on resources uniquely available from the international Sc2.0 consortium and will be an international resource for efficient evolution of high-value phenotypes. This project represents a new paradigm in synthetic biology in which a genome is pre-programmed to explore combinatorial diversity space to evolve new and useful function.