Microbial Resistance
Microbial Resistance - Related Videos
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Pyrosequencing is a versatile technique that facilitates microbial genome sequencing that can be used to identify bacterial species, discriminate bacterial strains, and detect genetic mutations that confer resistance to anti-microbial agents. In this video, the procedure for microbial amplicon generation, amplicon pyrosequencing, and DNA sequence analysis will be demonstrated.
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Bacterial Growth on a Microfluidic Chip to Study Antibiotic Drug Resistance
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Source: Liu, P. C., et al. Design and Use of a Low Cost, Automated Morbidostat for Adaptive Evolution of Bacteria Under Antibiotic Drug Selection. J. Vis. Exp. (2016)This video demonstrates the use of a microfluidic chip to visualize and compare the growth and morphology of wild-type and trimethoprim-resistant E. coli strains under trimethoprim antibiotic stress.
FAQs
Several mechanisms can preserve microbial growth during treatment. Changes in a drug’s target may prevent effective binding, while reduced membrane permeability can limit entry into the cell. Microorganisms may also inactivate antimicrobial compounds or use efflux pumps to remove them. Identifying the mechanism helps explain why a treatment fails and supports development of more effective therapies.
Mutations can generate resistance traits within a microbial population, whereas microorganisms can also acquire resistance genes from other cells. Horizontal gene transfer, including plasmid exchange, allows these traits to move between microorganisms rather than relying only on reproduction. This distinction is important because gene acquisition can contribute to the spread of resistance through populations.
Plasmid exchange provides a route for resistance genes to pass between microorganisms. Because these genes can encode traits that alter drug targets, reduce membrane permeability, inactivate antimicrobial compounds, or activate efflux pumps, their movement can change the resistance profile of a population. Tracking this exchange helps researchers understand how resistant strains emerge and spread.
Researchers can examine which resistance traits are present and relate them to changes in microbial behavior during antimicrobial exposure. Important areas include altered drug targets, membrane permeability, compound inactivation, efflux-pump activity, mutations, and acquired genes. Connecting a trait with treatment failure provides a biological explanation that can guide antimicrobial selection and therapeutic development.
Treatment can fail when microorganisms carry traits that prevent an antimicrobial compound from reaching its target, alter that target, inactivate the compound, or remove it through efflux pumps. Studying these mechanisms links a resistant strain to the observed outcome. That information can guide antimicrobial use and support the search for therapies that overcome the relevant resistance trait.
Microbial resistance research supports several connected goals: tracking emerging resistant strains, guiding responsible antimicrobial use, developing new therapies, and designing infection-control strategies. In biology, it also clarifies how mutations, acquired genes, reproduction, and horizontal gene transfer shape microbial populations. Together, these applications help address resistance as both a population-level process and a public-health concern.