title: A Conserved Helicobacter pylori Gene, HP0102, Is Induced Upon Contact With Gastric Cells and Has Multiple Roles in Pathogenicity.
abstract: Contact with host cells is recognized as a signal capable of triggering expression of bacterial genes important for host pathogen interaction. Adherence of Helicobacter pylori to the gastric epithelial cell line AGS strongly upregulated expression of a gene, HP0102, in the adhered bacteria in all strains examined, including several Indian clinical isolates. The gene is highly conserved and ubiquitously present in all 69 sequenced H. pylori genomes at the same genomic locus, as well as in 15 Indian clinical isolates. The gene is associated with 2 distinct phenotypes related to pathogenicity. In AGS cell-adhered H. pylori, it has a role in upregulation of cagA expression from a specific σ(28)-RNAP promoter and consequent induction of the hummingbird phenotype in the infected AGS cells. Furthermore, HP0102 has a role in chemotaxis and a ΔHP0102 mutant exhibited low acid-escape response that might account for the poor colonization efficiency of the mutant.
authors.affiliation: Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology.
authors.forename: Saurabh
authors.initials: S
authors.lastname: Bhattacharya
authors.affiliation: Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology.
authors.forename: Oindrilla
authors.initials: O
authors.lastname: Mukherjee
authors.affiliation: Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
authors.forename: Asish K
authors.initials: AK
authors.lastname: Mukhopadhyay
authors.affiliation: Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology.
authors.forename: Rukhsana
authors.initials: R
authors.lastname: Chowdhury
authors.forename: Apurba K
authors.initials: AK
authors.lastname: Pal
authors.forename: Kingshuk K
authors.initials: KK
authors.lastname: Dhar
mesh_terms: D001422:Bacterial Adhesion; D002460:Cell Line; D002633:Chemotaxis; D004847:Epithelial Cells / Q000382:microbiology*; D017353:Gene Deletion; D015964:Gene Expression Regulation, Bacterial; D016480:Helicobacter pylori / Q000472:pathogenicity* / Q000502:physiology; D006801:Humans; D015533:Transcriptional Activation; D037521:Virulence Factors / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D037521:Virulence Factors
keywords: CagA induction; H. pylori; HP0102; chemotaxis; host-pathogen interaction; σ28