Auxotroph Generation
Auxotroph Generation - Related Videos
13:31
Generation of Enterobacter sp. YSU Auxotrophs Using Transposon Mutagenesis
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Cited by 3 •
2014
Enterobacter sp. YSU grows in glucose minimal salts medium. Auxotrophs are generated by transforming it with a transposome which randomly inserts itself into the host genome. Mutants are found by replica plating from complex medium to minimal medium. Interrupted genes are identified by gene rescue and sequencing.
09:27
Generation of Fluorescent Protein Fusions in Candida Species
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Cited by 6 •
2017
PCR-mediated gene modification can be used to generate fluorescent protein fusions in Candida species, which facilitates visualization and quantitation of yeast cells and proteins. Herein, we present a strategy for constructing a fluorescent protein fusion (Eno1-FP) in Candida parapsilosis.
14:26
Intravital Imaging of Attenuated Auxotrophic Mycobacterium tuberculosis in Murine Lung during Early Intravascular Infection
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2026
Here, we present a protocol for intravital imaging of an attenuated BSL-2-approved Mycobacterium tuberculosis. strain in the murine lung using a permanent lung window. This approach enables longitudinal, single-cell-resolution analysis of early host-pathogen interactions, including bacillary localization, vascular dynamics, and macrophage uptake within the same lung microenvironment.
01:19
DC Generator
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2023
An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
01:22
Generation Time
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2025
Bacterial generation time, the period required for a bacterial population to double during its exponential growth phase, serves as a critical measure of microbial growth dynamics under optimal conditions. This parameter varies significantly across bacterial species and can be influenced by factors such as temperature, pH, and the availability of nutrients. For example, Escherichia coli can achieve a generation time of approximately 20 minutes, while Mycobacterium tuberculosis exhibits a much...
FAQs
Researchers can create the required metabolic defect through mutation, targeted gene replacement, or genome editing. Each approach alters a biosynthetic gene so that the corresponding pathway no longer supplies an essential metabolite. The resulting strain can then be evaluated by comparing growth under media that either contain or lack the relevant nutrient, linking genotype with a clear nutritional phenotype.
Disrupting a biosynthetic gene prevents cells from completing a metabolic route that supplies an essential compound. When that compound is absent from the medium, affected cells fail to grow, whereas supplementation can restore growth. This dependence connects pathway function to a practical selection strategy and helps researchers identify organisms carrying the intended metabolic alteration.
Supplementation distinguishes a biosynthetic defect from general loss of viability. If adding the missing compound supports growth, the result is consistent with interruption of the corresponding pathway. Researchers can therefore use paired media conditions, with and without the nutrient, to assess whether the altered strain shows the expected dependency before applying it in further biological or biotechnological work.
A typical workflow begins by altering a biosynthetic gene through mutation, targeted replacement, or genome editing. Cells are then grown under conditions designed to reveal dependence on the missing metabolite, and candidate strains are selected based on their growth response. The selected organisms can subsequently be used for pathway studies, genetic selection, or engineered production systems.
These strains provide experimental access to biosynthetic pathways because their growth depends on supplying a particular metabolite. Researchers can examine how disrupting a gene changes nutritional requirements and use growth behavior to connect genes with metabolic functions. This makes auxotrophic organisms useful for investigating pathway organization and the biological consequences of losing a biosynthetic capability.
Nutrient dependence can help control microbial growth by making proliferation conditional on supplying a required compound, supporting biological containment. The same strains can also carry selectable genetic markers and serve in systems producing metabolites, recombinant proteins, or other valuable products. Their utility therefore combines controlled growth with practical selection and engineered biosynthetic applications.