Pathogenicity Factors
Pathogenicity Factors - Related Videos
10:39
Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens
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Cited by 22 •
2013
We describe a method for tracking the endomembrane rupture elicited by the intracellular bacteria Shigella flexneri and Mycobacterium tuberculosis upon host cell invasion. Our assay makes use of CCF4, a host cytoplasmic FRET probe in live or fixed cells. This reporter is degraded by an enzyme activity present on the bacterial surface.
02:16
Transcription Factors
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2019
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
02:12
Muscle Necrosis Assay in C. elegans Induced by a Pathogenic Aeromonas Strain
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2026
Source: Chen, Y. et. al., Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model. J. Vis. Exp. (2018)This video demonstrates a muscle necrosis assay in C. elegans (Caenorhabditis elegans) using pathogenic Aeromonas strains. By feeding green fluorescent protein (GFP)-expressing worms on Aeromonas-seeded plates, the assay models bacterial infection and reveals tissue damage through fluorescence imaging. The progressive loss of muscle structure and GFP...
01:30
Immunohistological Detection of Pathogens in Brain Tissue
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2025
Wash to remove the paraffin, then rehydrate the tissue using decreasing alcohol concentrations.
04:01
Factors Affecting Solubility
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2020
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide: This solubility equilibrium may be shifted left by the addition of either silver or iodide ions, resulting in...
FAQs
These mechanisms act at different points in host interaction. Adhesion helps a microbe remain associated with host cells, invasion enables movement into tissues, and toxins produce harmful effects in the host. Considering them separately helps explain how pathogens establish infection and damage tissues, while their combined activity can contribute to differences in disease severity.
A microbe must obtain resources while encountering host defenses. Nutrient acquisition supports its persistence in the host, whereas immune evasion or suppression reduces the effectiveness of defensive responses. These mechanisms can therefore influence whether infection remains limited or progresses, and they help explain why disease outcomes depend on both microbial traits and host conditions.
The same microbial capability may produce different outcomes under different host conditions. Pathogenicity factors operate within an environment shaped by the host, so their effects are not determined by the microbe alone. Examining this interaction helps biology and medicine interpret differences in disease severity and transmission among pathogens rather than attributing every outcome to a single microbial trait.
Researchers can examine which traits, structures, or products are associated with adhesion, invasion, toxin production, nutrient acquisition, or immune interference. Comparing these features across pathogens provides a framework for relating microbial mechanisms to disease severity and transmission. This approach connects observable clinical or epidemiological differences with the biological processes that may contribute to them.
Traits or products linked to disease-causing activity can provide useful targets for diagnostic development. Detecting or characterizing such features may help distinguish pathogens or identify biologically relevant mechanisms associated with infection. Their value comes from connecting a measurable microbial characteristic with disease-related behavior, giving diagnostic research a mechanistic basis rather than relying only on symptoms.
Targeting virulence mechanisms focuses treatment on the processes that promote host damage or persistence, such as toxin production or immune interference. The overview identifies this strategy as a way to develop antimicrobial therapies while potentially reducing selective pressure for resistance. It also supports vaccine research by directing attention toward microbial features relevant to pathogenic activity.