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Microorganisms and Genetic Improvement for First and Second Generation Bioethanol Production

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Liquid Biofuels: Bioethanol

Abstract

This chapter explores the main microbial breeding techniques for 1G and 2G bioethanol production, including classical genetic strategies (induced mutations, clonal selection, sexual hybridization, artificial hybridization, and evolutionary engineering) and those based on genetic transformation (deletion and regulation of genes, pooled-segregant whole genome sequence analysis, and CRISPR/CAS9 system). Saccharomyces cerevisiae has long been a popular model organism for breeding biological research; however, genetic manipulation of non-model microorganisms (e.g., Z. mobilis and Escherichia coli) has also been explored mainly for 2G ethanol production. Tools based on classical genetics are generally random and, therefore, less efficient. However, these techniques have the advantage of not needing prior knowledge about the gene of interest (facilitated procedure), and the microorganisms generated are not considered genetically modified. On the other hand, modifications based on genetic transformation result in more targeted improvements and overproduction of metabolites, although they are more expensive techniques and require extensive knowledge of intracellular biochemical pathways and regulatory mechanisms.

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Acknowledgements

The authors acknowledge the financial support given by CNPq and CAPES.

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de Melo Pereira, G.V. et al. (2022). Microorganisms and Genetic Improvement for First and Second Generation Bioethanol Production. In: Soccol, C.R., Amarante Guimarães Pereira, G., Dussap, CG., Porto de Souza Vandenberghe, L. (eds) Liquid Biofuels: Bioethanol. Biofuel and Biorefinery Technologies, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-031-01241-9_3

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