Phenotypic Screening Assay
Phenotypic Screening Assay - Related Videos
15:28
A Microscopic Phenotypic Assay for the Quantification of Intracellular Mycobacteria Adapted for High-throughput/High-content Screening
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Cited by 30 •
2014
Here, we describe a phenotypic assay applicable to the High-throughput/High-content screens of small-interfering synthetic RNA (siRNA), chemical compound, and Mycobacterium tuberculosis mutant libraries. This method relies on the detection of fluorescently labeled Mycobacterium tuberculosis within fluorescently labeled host cell using automated confocal microscopy.
09:40
RNAi Screening to Identify Postembryonic Phenotypes in C. elegans
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Cited by 9 •
2012
We describe a sensitized method to identify postembryonic regulators of protein expression and localization in C. elegans using an RNAi-based genomic screen and an integrated transgene that expresses a functional, fluorescently tagged protein.
05:42
A Barcoding Assay for Phenotypic and Functional Characterization of Immune Cells
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2025
This video highlights a single-cell proteomic method that employs heavy-metal-conjugated antibodies for distinct cell barcoding. Subsequently, immunostaining and mass cytometry are applied to evaluate immune phenotypic and functional alterations in human whole blood-derived immune cells.
11:44
Generation and Multi-phenotypic High-content Screening of Coxiella burnetii Transposon Mutants
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Cited by 28 •
2015
Coxiella burnetii is an obligate intracellular Gram-negative bacterium responsible for the zoonotic disease Q fever. Here we describe methods for the generation of Coxiella fluorescent transposon mutants as well as the automated identification and analysis of the resulting internalization, replication and cytotoxic phenotypes.
08:43
A Fluorescence-based Lymphocyte Assay Suitable for High-throughput Screening of Small Molecules
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Cited by 10 •
2017
We present in the current study a novel fluorescence-based assay using lymphocytes derived from a transgenic mouse. This assay is suitable for high-throughput screening (HTS) of small molecules endowed with the capacity of either inhibiting or promoting lymphocyte activation.
FAQs
The main advantage is that compounds are judged by changes in an intact biological context rather than by activity against a predefined molecular target. That context may include interactions among neuronal cells, tissue-level responses, or organismal behavior. The tradeoff is that an observed effect does not immediately identify the responsible target, making confirmation and mechanism studies essential.
Useful readouts include neuronal survival, cellular morphology, electrical activity, and behavior. Automated imaging can capture changes in cell structure or viability, while electrophysiology measures neuronal activity and behavioral measurements assess effects in model organisms. The selected readout determines which aspect of nervous system function becomes visible and helps align the assay with the biological question.
An initial active compound shows that a measurable biological response occurred, but it does not establish why. Secondary assays confirm that the effect is reproducible and biologically relevant, while target deconvolution investigates the molecular mechanism responsible. Together, these steps help distinguish genuine candidates from assay-specific signals and connect observed phenotypes with underlying pathways.
A typical workflow exposes cells, tissues, or model organisms to a compound library, records a defined biological response, and identifies compounds associated with meaningful changes. Researchers then confirm the active compounds and apply secondary assays to examine their effects more closely. Finally, target deconvolution helps investigate the mechanisms that could explain the original phenotype.
This strategy is useful when the desired therapeutic effect can be measured biologically but the most relevant molecular target is uncertain or incomplete. Researchers can begin with outcomes such as neuronal survival, morphology, activity, or behavior, then investigate mechanisms afterward. It therefore supports discovery in complex nervous system processes where multiple interacting pathways may influence the phenotype.
In neuroscience, these assays can support investigations of neurodegeneration, neurodevelopment, synaptic function, and other nervous system processes. Depending on the model and measurement, they may reveal compounds that alter neuronal viability, structure, activity, or behavior. The resulting candidates can also expose pathways involved in disease-related or functional phenotypes for subsequent mechanistic study.