Diverse genetic error modes constrain large-scale bio-based production

Nature Communications
Peter RugbjergMorten O A Sommer

Abstract

A transition toward sustainable bio-based chemical production is important for green growth. However, productivity and yield frequently decrease as large-scale microbial fermentation progresses, commonly ascribed to phenotypic variation. Yet, given the high metabolic burden and toxicities, evolutionary processes may also constrain bio-based production. We experimentally simulate large-scale fermentation with mevalonic acid-producing Escherichia coli. By tracking growth rate and production, we uncover how populations fully sacrifice production to gain fitness within 70 generations. Using ultra-deep (>1000×) time-lapse sequencing of the pathway populations, we identify multiple recurring intra-pathway genetic error modes. This genetic heterogeneity is only detected using deep-sequencing and new population-level bioinformatics, suggesting that the problem is underestimated. A quantitative model explains the population dynamics based on enrichment of spontaneous mutant cells. We validate our model by tuning production load and escape rate of the production host and apply multiple orthogonal strategies for postponing genetically driven production declines.

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Datasets Mentioned

BETA
E-MTAB-5862

Methods Mentioned

BETA
protein folding
Illumina sequencing
PCR

Software Mentioned

nls2 R
CLC Genomics Workbench
R
ArrayExpress
CLC Genomics
Breakpoint analysis

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