The complete genome sequence of Helicobacter typhlonius
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ABSTRACT: In this study, we reveal the complete sequence of the Helicobacter typhlonius genome along with its annotation and global methylation state at single-nucleotide resolution.
Project description:As the number of bacterial genomes and transcriptomes increases, so does the number of newly identified toxin–antitoxin (TA) systems. However, their functional characterization remains challenging, often requiring the use of overexpression vectors that can lead to misinterpretations. To fill this gap, we developed a systematic approach called FASTBAC-Seq (Functional AnalysiS of Toxin–Antitoxin Systems in BACteria by Deep Sequencing). Combining life/death phenotypic selection with next-generation sequencing, FASTBAC-Seq allows the rapid identification of loss-of- function (toxicity) mutations in toxin-encoding genes belonging to TA loci with nucleotide resolution. Here, we apply this new tool to study aapA3/IsoA3, a member of a new family of type I TA systems hosted on the chromosome of the major human gastric pathogen Helicobacter pylori.
Project description:This study reveals widespread Pol II pausing at single-nucleotide resolution across the human genome with the majority of Pol II pauses occur outside of promoter-proximal gene regions primarily along the gene-body of transcribed genes. We show DNA sequence properties underlying widespread transcriptional pausing including a new pause motif. The study indicates pervasive sequence-induced transcriptional pausing in human cells.
Project description:We have previously reported human gastrin overexpressing transgenic mice (=INS-GAS mice) and Helicobacter felis (=H.felis) infection synergistically accelerated gastric cancer in mice stomachs. (Wang et al 2000) Using this mouse model, we employed microarray analysis of gene expression profiling to identify gastric cancer-specific genes. Keywords: disease state analysis
Project description:Complete nucleotide sequence and determination of the replication region of the sporulation inhibiting plasmid p576 from Bacillus pumilus NRS576.
Project description:The files in this archive examine six species within the genus Helicobacter to assay their histidine-rich proteins. They correspond to the manuscript "Expansion of nickel binding- and histidine-rich proteins during gastric adaptation of Helicobacter species" by Frederic Fischer, Egor Vorontsov, Evelyne Turlin, Christian Malosse, Camille Garcia, David L. Tabb, Julia Chamot-Rooke, Riccardo Percudani, Daniel Vinella and Hilde De Reuse.
The sequence databases for the Helicobacter species are based on reference or complete UniProt proteomes in FASTA format, supplemented with reannotations of Hpn and Hpn2 protein products.
The full list of RAW files, including their attribution to individual species and the type of experiment they represent, can be found in RAWs-Readme. We have included QuaMeter IDFree metrics to include basic statistics such as length of LC gradient, the number of MS/MS scans, etc.
Project description:Helicobacter pylori (H. pylori) is a human pathogen that infects almost half of the world’s population. Infection with H. pylori is frequently associated with chronic gastritis and can even lead to gastric and duodenal ulcers and gastric cancer. Although the persistent colonization of H. pylori and the development of H. pylori-associated gastritis remain poorly understood, it is believed that, in gastric mucosa, the modulated gastric epithelial cells (GECs) by H. pylori are key contributors. We used microarrays to detail the global programme of gene expression in Helicobacter pylori infected-gastric epithelial cell line AGS cells and identified up-regulated genes induced by Helicobacter pylori infection.
Project description:We are now trying to elucidate the mechanism of Helicobacter-induced gastritis and gastric cancer. To identify genes involved in these Helicobacter-associated diseases, we infected Helicobacter felis to INS-GAS (insulin-gastrin transgenic) mice (C57BL/6 background) which shows accelerated development of gastritis and gastric cancer.
Project description:Helicobacter pylori is a gram-negative pathogen that colonizes the stomachs of over half the world's population and causes a spectrum of gastric diseases including gastritis, ulcers, and gastric carcinoma. The H. pylori species exhibits unusually high levels of genetic variation between strains. Here we announce the complete genome sequence of H. pylori strain G27, which has been used extensively in H. pylori research.