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Phenotypic screening is a type of screening used in biological research and drug discovery to identify substances such as small molecules, peptides, or RNAi that alter the phenotype of a cell or an organism in a desired manner. [1]
A genetic screen or mutagenesis screen is an experimental technique used to identify and select individuals who possess a phenotype of interest in a mutagenized population. [1] Hence a genetic screen is a type of phenotypic screen .
Forward (classical) and reverse pharmacology approaches in drug discovery. In the field of drug discovery, classical pharmacology, [1] also known as forward pharmacology, [2] [3] [4] or phenotypic drug discovery (PDD), [5] relies on phenotypic screening (screening in intact cells or whole organisms) of chemical libraries of synthetic small molecules, natural products or extracts to identify ...
Given the increase in the use of phenotypic/visual screening as a cell biological tool, methods are required that permit systematic biochemical target identification if these molecules are to be of broad use. [6] Target identification has been defined as the rate limiting step in chemical genetics/high-content screening. [7]
Over recent years, the genome-wide CRISPR screen has emerged as a powerful tool for performing large-scale loss-of-function screens, with low noise, high knockout efficiency and minimal off-target effects. Genome-wide CRISPR/Cas9 Knockout Screens: Workflow Overview. 1.
Phenotypic screening of chemical libraries is used to identify drug targets (forward genetics or chemoproteomics) or to validate those targets in experimental models of disease (reverse genetics). [2] Recent applications of this topic have been implicated in signal transduction, which may play a role in discovering new cancer treatments. [3]
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In this context, a phenotypic screen is usually employed to identify drugs with a desired effect in vitro, such as inhibition of viral plaque formation. If a drug produces a positive test, the next step is to determine whether it is acting on a known or novel target. Chemoproteomics is thus a follow-up to phenotypic screening.