Bacterial Mutants
Bacterial Mutants - Related Videos
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.
12:29
Generation of Null Mutants to Elucidate the Role of Bacterial Glycosyltransferases in Bacterial Motility
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Cited by 2 •
2022
Here, we describe the construction of null mutants of Aeromonas in specific glycosyltransferases or regions containing glycosyltransferases, the motility assays, and flagella purification performed to establish the involvement and function of their encoded enzymes in the biosynthesis of a glycan, as well as the role of this glycan in bacterial pathogenesis.
02:44
Phase-Contrast Microscopy for Evaluating Developmental Mutants in Streptomyces
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2025
Source: Bennett, J. A. et al. Visual and Microscopic Evaluation of Streptomyces Developmental Mutants. J. Vis. Exp. (2018)This video demonstrates the use of phase-contrast microscopy to examine phenotypic differences between wild-type and mutant Streptomyces coelicolor. It outlines the steps involved in preparing and imaging aerial filaments to detect developmental defects in spore formation.
05:13
Assessment of Intracellular Growth of Coxiella Mutants within Eukaryotic Cells
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2025
This video demonstrates a method for assessing the intracellular growth of GFP-tagged Coxiella mutants within cultured epithelial cells. The mutant phenotype is visualized using immunostaining and epifluorescence microscopy, allowing the study of the effect of the mutation on intracellular growth.
04:14
Generation of Antibiotic-Marked Mutants in Cyanobacteria via Homologous Recombination
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2025
Source: Lea-Smith, D. J., et al. Generation of Marked and Markerless Mutants in Model Cyanobacterial Species. J. Vis. Exp. (2016)The video demonstrates a method for generating antibiotic-marked mutants in cyanobacteria. The protocol begins with culturing cyanobacteria, followed by centrifugation and washing steps that preserve surface pili. A plasmid carrying an antibiotic resistance gene flanked by homologous sequences is then introduced. During incubation, the plasmid is internalized via pili...
FAQs
The consequences of a mutation depend on which inherited trait it alters. Changes may affect growth, metabolism, antibiotic susceptibility, or virulence, so two mutants from the same bacterial background can produce very different biological observations. This variation allows investigators to connect a genetic change with a measurable phenotype rather than treating all mutations as equivalent.
Replication errors, environmental DNA damage, and laboratory genetic manipulation can generate distinct mutant strains. Once variants exist, natural selection may favor those whose altered traits improve survival or reproduction under particular conditions. In infection research, this principle matters because changes in growth, persistence, antibiotic susceptibility, or virulence can influence which bacterial variants become prominent.
An otherwise related parental strain provides a reference for judging what changed after mutation. Differences in invasion, immune recognition, persistence, or disease progression can then be associated with the altered genetic background more directly than with general differences between unrelated bacteria. This comparison helps researchers identify genes that contribute to specific stages of infection and prioritize mechanisms for further study.
Researchers can interpret a virulence difference alongside measurements of growth and metabolism. If a mutant differs in disease-related behavior while also showing altered basic growth, the observations require more careful attribution because general bacterial performance may contribute. Considering these traits together helps determine whether the genetic change is most closely associated with virulence itself or with broader bacterial biology.
Researchers begin with a mutant and its parental strain, then examine the inherited traits relevant to the question, such as growth, metabolism, antibiotic susceptibility, virulence, host invasion, immune recognition, persistence, or disease progression. Interpreting differences across these measurements helps connect the genetic change to infection biology and avoids focusing on a single outcome in isolation.
They are especially useful when investigators need to determine whether a bacterial gene contributes to host invasion, immune recognition, persistence, or disease progression. Mutant-parent comparisons can reveal pathogen mechanisms that are difficult to infer from population-level observations alone. The resulting knowledge may support research on therapeutic targets, vaccines, diagnostics, and antimicrobial strategies.
Altered antibiotic susceptibility in a mutant can indicate that the changed gene influences how the bacterium responds to antimicrobial pressure. Comparing that mutant with its parental strain helps separate the specific effect of the genetic change from baseline properties of the bacterial background. Such findings can guide investigation of antimicrobial strategies and clarify why related strains may respond differently.