Pathogenicity Screening
Pathogenicity Screening - Related Videos
11:30
Unravelling the Function of a Bacterial Effector from a Non-cultivable Plant Pathogen Using a Yeast Two-hybrid Screen
0 Views •
Cited by 8 •
2017
Bacterial effector proteins are important for establishing successful infections. This protocol describes the experimental identification of proteinaceous binding partners of a bacterial effector protein in its natural plant host. Identifying these effector interactions via yeast two-hybrid screens has become an important tool in unravelling molecular pathogenicity strategies.
02:12
Co-Infiltration Assay for Screening Pathogen Effectors that Suppress Plant RNA Silencing
0 Views •
2026
Source: Shi, J., et al. Screening and Identification of RNA Silencing Suppressors from Secreted Effectors of Plant Pathogens. J. Vis. Exp. (2020)This video demonstrates a co-infiltration assay for identifying pathogen effector proteins that suppress RNA silencing in Nicotiana benthamiana 16c. A fluorescent reporter and a candidate effector gene are delivered into plant leaves via Agrobacterium. Normally, RNA silencing degrades reporter transcripts, reducing fluorescence. Suppressor effectors...
13:45
Using a Pan-Viral Microarray Assay (Virochip) to Screen Clinical Samples for Viral Pathogens
0 Views •
Cited by 84 •
2011
The Virochip is a pan-viral microarray designed to simultaneously detect all known viruses as well as novel viruses on the basis of conserved sequence homology. Here we demonstrate how to run a Virochip assay to analyze clinical samples for the presence of both known and unknown viruses.
10:19
Screening and Identification of RNA Silencing Suppressors from Secreted Effectors of Plant Pathogens
0 Views •
Cited by 2 •
2020
Here, we present a modified screening method that can be extensively used to quickly screen RNA silencing suppressors in plant pathogens.
09:04
Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7
0 Views •
Cited by 14 •
2017
The overall goal of this protocol is to synthesize functional nanosensors for the portable, cost-effective, and rapid detection of specifically targeted pathogenic bacteria through a combination of magnetic relaxation and fluorescence emission modalities.
FAQs
Genomic and molecular analyses can identify genes or other features associated with virulence, but they do not by themselves show how an organism behaves in a host-related setting. Controlled phenotypic assays add functional evidence by examining attachment, invasion, growth, toxin production, or resistance to host defenses. Together, these approaches connect biological potential with observable behavior.
Useful indicators include the ability to attach to host cells, invade them, grow under host-like conditions, produce toxins, or resist host defenses. Each trait represents a different interaction with the host and can contribute distinct evidence about disease-causing capacity. Examining several properties provides a broader profile than relying on a single behavior or molecular marker.
Growth under host-like conditions and resistance to host defenses help reveal whether an organism can maintain relevant functions in circumstances that resemble host interaction. These assays add context to molecular findings and may distinguish traits that are merely present from traits that are expressed as measurable behavior. The resulting profile supports more meaningful comparisons among organisms.
Comparing strains can show which genetic features or behaviors are associated with differences in pathogenic capacity. A strain that differs in attachment, invasion, toxin production, or defense resistance may help researchers connect that phenotype with particular molecular findings. Such comparisons support identification of virulence-associated genes or behaviors and help prioritize strains for additional investigation.
The workflow combines genomic or molecular examination with controlled phenotypic assays. Researchers first gather evidence about relevant molecular features and then assess observable properties such as host-cell attachment, invasion, growth under host-like conditions, toxin production, or resistance to host defenses. Results from these complementary assessments are compared across organisms or strains to support risk evaluation and further study.
Researchers may apply this approach during surveillance, outbreak investigation, antimicrobial research, vaccine research, or evaluation of experimental models. The findings help distinguish organisms that warrant closer attention, compare strains, and identify characteristics linked with virulence. Screening therefore supports decisions about which organisms or traits should receive additional investigation while contributing to broader biological and public health assessments.
Results provide a structured basis for ranking organisms according to their molecular features and observed host-related behaviors. Researchers can use that information to select organisms for further study, recognize potentially important virulence-associated traits, and assess experimental models in light of pathogenic properties. This prioritization helps align biological investigation with risk assessment, surveillance needs, and the goals of antimicrobial or vaccine research.