title: Assessment of environmental factors on Listeria monocytogenes Scott A inlA gene expression by relative quantitative Taqman real-time reverse transcriptase PCR.
abstract: Several virulence factors are involved in Listeria monocytogenes pathogenicity. L. monocytogenes internalins, particularly internalin A, are required for bacterial adhesion to and invasion of human intestinal epithelial cells. The expression of internalins is thus related to virulence. Identification of conditions involved in regulating the expression of L. monocytogenes virulence factors is essential for developing targeted strategies to control listeriosis incidence and improving therapeutic approaches. The primary aim of this study was to develop a quantitative real-time reverse transcriptase PCR platform to study the impact of environmental factors on L. monocytogenes Scott A virulence factor expression, particularly in potentially complex ecosystems. A Taqman PCR-based, rapid quantitative gene expression evaluation method was established with the L. monocytogenes ribosomal protein L4 encoding gene used as an internal standard. Our data suggest that inlA expression is influenced by food composition and temperature, indicating that certain food processing or storage conditions, such as the use of lactic and acetic acids at common storage temperatures, could affect the expression of L. monocytogenes virulence factor.
authors.affiliation: Department of Food Science and Technology, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Scott E
authors.initials: SE
authors.lastname: Hanna
authors.forename: Hua H
authors.initials: HH
authors.lastname: Wang
mesh_terms: D001422:Bacterial Adhesion; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D004777:Environment; D005511:Food Handling / Q000379:methods*; D005516:Food Microbiology; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008089:Listeria monocytogenes / Q000235:genetics / Q000254:growth & development / Q000472:pathogenicity*; D012329:RNA, Bacterial / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013696:Temperature; D013997:Time Factors; D014774:Virulence
chemical_list: D001426:Bacterial Proteins; D012329:RNA, Bacterial; C069761:internalin protein, Bacteria