Subtopic Deep Dive
Listeria monocytogenes Virulence Determinants
Research Guide
What is Listeria monocytogenes Virulence Determinants?
Listeria monocytogenes virulence determinants are molecular factors such as internalins, listeriolysin O, and ActA that enable the bacterium's intracellular survival, cell-to-cell spread, and host immune evasion.
Researchers identify these determinants through genetic, proteomic, and functional studies of genes regulated by PrfA. Key factors include bile salt hydrolase for intestinal survival (Dussurget et al., 2002) and ActA for actin-based motility (Niebuhr, 1997). Over 20 reviews cite Vázquez-Boland et al. (2001) with 2140 citations as the seminal work.
Why It Matters
Virulence determinants inform vaccine design targeting listeriolysin O and internalins to prevent listeriosis in vulnerable populations. Vázquez-Boland et al. (2001) detail how these factors drive foodborne transmission, enabling risk assessment in dairy and ready-to-eat foods. Dussurget et al. (2002) show bile salt hydrolase's role in hepatic infection, guiding probiotic interventions. Ragon et al. (2008) link evolutionary virulence gains to outbreak strains.
Key Research Challenges
Identifying novel virulence genes
Genetic screens reveal PrfA-regulated factors, but distinguishing essential from accessory genes remains difficult amid genomic plasticity. Vázquez-Boland et al. (2001) catalog known determinants, yet proteomics lags in low-expression proteins. Ragon et al. (2008) highlight recombination obscuring novel acquisitions.
Quantifying host-pathogen dynamics
In vitro models inadequately replicate intestinal and hepatic phases where bile salt hydrolase acts (Dussurget et al., 2002). ActA motility assays (Niebuhr, 1997) overlook immune evasion synergies. Groisman and Ochman (1996) note pathogenicity islands complicate kinetic modeling.
Linking determinants to food safety
Environmental persistence ties to virulence evolution (Ragon et al., 2008), but strain-specific risks evade prediction. Vázquez-Boland et al. (2001) emphasize foodborne niches selecting hypervirulent clones. Validation requires multi-omics integration across outbreaks.
Essential Papers
<i>Listeria</i>Pathogenesis and Molecular Virulence Determinants
José A. Vázquez‐Boland, Michael Kuhn, Patrick Berche et al. · 2001 · Clinical Microbiology Reviews · 2.1K citations
SUMMARY The gram-positive bacterium Listeria monocytogenes is the causative agent of listeriosis, a highly fatal opportunistic foodborne infection. Pregnant women, neonates, the elderly, and debili...
<i>Campylobacter jejuni—</i>An Emerging Foodborne Pathogen
Sean F. Altekruse, Norman J. Stern, Patricia I. Fields et al. · 1999 · Emerging infectious diseases · 877 citations
Campylobacter jejuni is the most commonly reported bacterial cause of foodborne infection in the United States. Adding to the human and economic costs are chronic sequelae associated with C. jejuni...
Foodborne pathogens
Thomas Bintsis · 2017 · AIMS Microbiology · 817 citations
Foodborne pathogens are causing a great number of diseases with significant effects on human health and economy. The characteristics of the most common pathogenic bacteria (<i>Bacillus cereus</i>, ...
A New Perspective on Listeria monocytogenes Evolution
Marie Ragon, Thierry Wirth, Florian Hollandt et al. · 2008 · PLoS Pathogens · 577 citations
Listeria monocytogenes is a model organism for cellular microbiology and host-pathogen interaction studies and an important food-borne pathogen widespread in the environment, thus representing an a...
Pathogenicity Islands: Bacterial Evolution in Quantum Leaps
Eduardo A. Groisman, Howard Ochman · 1996 · Cell · 559 citations
Host adapted serotypes of <i>Salmonella enterica</i>
Sergio Uzzau, Derek Brown, T. S. Wallis et al. · 2000 · Epidemiology and Infection · 451 citations
Salmonella constitutes a genus of zoonotic bacteria of worldwide economic and health importance. The current view of salmonella taxonomy assigns the members of this genus to two species: S. enteric...
A novel proline-rich motif present in ActA of Listeria monocytogenes and cytoskeletal proteins is the ligand for the EVH1 domain, a protein module present in the Ena/VASP family
Kirsten Niebuhr · 1997 · The EMBO Journal · 413 citations
Reading Guide
Foundational Papers
Start with Vázquez-Boland et al. (2001, 2140 citations) for comprehensive catalog of determinants like internalins and listeriolysin O; follow with Niebuhr (1997) on ActA mechanisms and Dussurget et al. (2002) on bile salt hydrolase, establishing PrfA regulation core.
Recent Advances
Ragon et al. (2008, 577 citations) updates evolution of virulence traits; cross-reference with Groisman and Ochman (1996) on pathogenicity islands driving acquisitions.
Core Methods
PrfA-dependent expression assays, transposon mutagenesis (Vázquez-Boland et al., 2001), EVH1 ligand binding for ActA (Niebuhr, 1997), and bile challenge infections (Dussurget et al., 2002).
How PapersFlow Helps You Research Listeria monocytogenes Virulence Determinants
Discover & Search
Research Agent uses searchPapers('Listeria monocytogenes PrfA-regulated virulence factors') to retrieve Vázquez-Boland et al. (2001), then citationGraph reveals 2140 downstream papers on internalins and ActA. exaSearch('bile salt hydrolase listeriolysin O mutants') uncovers Dussurget et al. (2002); findSimilarPapers extends to ActA motifs from Niebuhr (1997).
Analyze & Verify
Analysis Agent applies readPaperContent on Dussurget et al. (2002) to extract PrfA binding data, then runPythonAnalysis parses mutation frequencies with pandas for statistical significance (p<0.01 survival rates). verifyResponse(CoVe) cross-checks claims against Ragon et al. (2008); GRADE grading scores Vázquez-Boland et al. (2001) as high-evidence for determinant classification.
Synthesize & Write
Synthesis Agent detects gaps in ActA immune evasion post-Niebuhr (1997), flagging underexplored synergies with listeriolysin O. Writing Agent uses latexEditText to draft sections, latexSyncCitations integrates Vázquez-Boland et al. (2001), and latexCompile generates review manuscripts. exportMermaid visualizes PrfA regulon networks from Groisman and Ochman (1996) pathogenicity islands.
Use Cases
"Analyze survival curves of Listeria bile salt hydrolase mutants from Dussurget 2002"
Analysis Agent → readPaperContent(Dussurget et al., 2002) → runPythonAnalysis(pandas plot of hepatic phase data) → matplotlib figure of log-rank p-values showing 3-fold survival drop.
"Write LaTeX review on Listeria ActA motility mechanisms"
Synthesis Agent → gap detection(Niebuhr 1997 + Vázquez-Boland 2001) → Writing Agent → latexEditText(structure) → latexSyncCitations(10 refs) → latexCompile(PDF with ActA-EVH1 diagram).
"Find open-source code for Listeria virulence gene predictors"
Research Agent → paperExtractUrls(Vázquez-Boland 2001) → paperFindGithubRepo → githubRepoInspect(PrfA motif scanner) → runPythonAnalysis(test on Ragon 2008 genomes) → CSV of predicted islands.
Automated Workflows
Deep Research workflow scans 50+ citations of Vázquez-Boland et al. (2001) via searchPapers → citationGraph → structured report ranking determinants by outbreak association. DeepScan applies 7-step CoVe to verify Dussurget et al. (2002) claims: readPaperContent → verifyResponse → GRADE → runPythonAnalysis on datasets. Theorizer generates hypotheses on ActA evolution from Niebuhr (1997) + Ragon (2008) via gap detection → mermaid regulon models.
Frequently Asked Questions
What defines Listeria monocytogenes virulence determinants?
Molecular factors like internalins for invasion, listeriolysin O for vacuole escape, ActA for spread, and bile salt hydrolase for gut survival, primarily PrfA-regulated (Vázquez-Boland et al., 2001; Dussurget et al., 2002).
What are key methods for studying these determinants?
Genetic knockouts, PrfA reporter fusions, actin polymerization assays for ActA (Niebuhr, 1997), and bile exposure survival tests (Dussurget et al., 2002), combined with genomic island detection (Groisman and Ochman, 1996).
Which papers are most cited on this topic?
Vázquez-Boland et al. (2001, 2140 citations) reviews all major determinants; Dussurget et al. (2002, 351 citations) details bile salt hydrolase; Niebuhr (1997, 413 citations) characterizes ActA motifs.
What open problems exist in virulence research?
Evolutionary origins of novel genes via recombination (Ragon et al., 2008), quantitative models of multi-determinant synergies, and food matrix effects on expression remain unresolved.
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