You wish to isolate temperature-sensitive mutants (e.g., those able to grow at 30^∘ C but not at

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You wish to isolate temperature-sensitive mutants (e.g.,...

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Key Concepts

Selective Screening

This method involves growing mutagenized cells under controlled temperature conditions to identify those that exhibit the temperature-sensitive phenotype. By initially cultivating cells at the permissive temperature and then shifting to the restrictive temperature, researchers can select for mutants that only thrive under the former condition, thereby isolating the desired mutants.

Mutagenesis

This is the process of inducing mutations in cells using chemical agents, radiation, or other means. It is an essential step in generating a diverse pool of mutants from which specific temperature-sensitive mutants can be isolated through screening.

Permissive and Restrictive Temperatures

The concept involves using different temperature regimes where a mutant cell can survive and grow at one temperature (permissive) but fails to do so at another (restrictive). This differential growth is key in distinguishing mutants with temperature-dependent defects from wild-type cells.

Temperature-Sensitive Mutations

These are mutations that result in a functional protein at lower, permissive temperatures, but the protein becomes unstable or non-functional at higher, restrictive temperatures. This conditional trait allows researchers to study essential genes by selectively inactivating their function when desired.

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