Application of Titration-Based Screening for the Rapid Pilot Testing of High-Throughput Assays
2014
Pilot testing of an assay intended for high-throughput screening (HTS) with small compound sets is a necessary but often time-consuming step in the validation of an assay protocol. When the initial testing
concentrationis less than optimal, this can involve iterative testing at different
concentrationsto further evaluate the pilot outcome, which can be even more time-consuming. Quantitative HTS (qHTS) enables flexible and rapid collection of assay performance statistics, hits at different
concentrations, and
concentration-response curves in a single experiment. Here we describe the qHTS process for pilot testing in which eight-point
concentration-response curves are produced using an interplate asymmetric dilution protocol in which the first four
concentrationsare used to represent the range of typical HTS screening
concentrationsand the last four
concentrationsare added for robust curve fitting to determine potency/efficacy values. We also describe how these data can be analyzed to predict the frequency of false-positives, false-negatives,
hit rates, and confirmation rates for the HTS process as a function of screening
concentration. By taking into account the compound pharmacology, this pilot-testing paradigm enables rapid assessment of the assay performance and choosing the optimal
concentrationfor the large-scale HTS in one experiment.
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