Assessment of Recent Process Analytical Technology (PAT) Trends: A Multiauthor Review

Biosynthesis enables renewable production of manifold compounds, yet often biosynthetic performance must be improved for it to be economically feasible. Nongenetic, cell-to-cell variations in protein and metabolite concentrations are naturally inherent, suggesting the existence of both high- and low-performance variants in all cultures. Although having an intrinsic source of low performers might cause suboptimal ensemble biosynthesis, the existence of high performers suggests an avenue for performance enhancement. Here we develop in vivo population quality control (PopQC) to continuously select for high-performing, nongenetic variants. We apply PopQC to two biosynthetic pathways using two alternative design principles and demonstrate threefold enhanced production of both free fatty acid (FFA) and tyrosine. We confirm that PopQC improves ensemble biosynthesis by selecting for nongenetic high performers. Additionally, we use PopQC in fed-batch FFA production and achieve 21.5 g l(-1) titer and 0.5 g l(-1) h(-1) productivity. Given the ubiquity of nongenetic variation, PopQC should be applicable to a variety of metabolic pathways for enhanced biosynthesis.

Exploiting nongenetic cell-to-cell variation for enhanced biosynthesis.

The development and application of a single-cell biosensor for the detection of l-methionine and branched-chain amino acids.

A perspective on PSE in pharmaceutical process development and innovation

Bio-production of lactobionic acid: Current status, applications and future prospects

Experimental methods and modeling techniques for description of cell population heterogeneity.

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Experimental methods and modeling techniques for description of cell population heterogeneity.