Quantifying the performance of high-throughput directed evolution protocols
2018
Most protocols for the high-throughput directed evolution of enzymes rely on random encapsulation to link phenotype and genotype. In order to optimize these approaches, or compare one to another, one needs a measure of their performance at extracting the best variants. We introduce here a new metric named the Selection Quality Index (SQI), which can be computed from a simple mock experiment with a known initial fraction of active variants. As opposed to previous approaches, our index integrates the random co-encapsulation of entities in compartments and comes with a straightforward experimental interpretation. We further show how this new metric can be used to extract general trends of protocol efficiency, or reveal hidden mechanisms such as a counterintuitive form of beneficial poisoning in the Compartmentalized Self-Replication protocol.
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