The Complete Genome Sequence of a Chronic Atrophic Gastritis Helicobacter pylori Strain: Evolution during Disease Progression

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 103; no. 26; pp. 9999 - 10004
• Main Authors: Oh, Jung D., Kling-Bäckhed, Helene, Giannakis, Marios, Xu, Jian, Fulton, Robert S., Fulton, Lucinda A., Cordum, Holland S., Wang, Chunyan, Elliott, Glendoria, Edwards, Jennifer, Mardis, Elaine R., Engstrand, Lars G., Gordon, Jeffrey I.
• Format: Journal Article
• Language: English
• Published: United States National Academy of Sciences 27.06.2006; National Acad Sciences
• Subjects: Adenocarcinoma; Adenocarcinoma - microbiology; Bacteria; Base Pairing; Biological Sciences; Biosynthesis; Cancer; Chronic Disease; Disease Progression; DNA; Enzymes; Epithelial cells; Gastritis, Atrophic - microbiology; Gastrointestinal diseases; Gene Expression Profiling; Gene Expression Regulation, Bacterial; Genes; Genome, Bacterial - genetics; Genomes; Genomic Instability; Genomics; Genotype; Helicobacter pylori; Helicobacter pylori - drug effects; Helicobacter pylori - genetics; Helicobacter pylori - growth & development; Humans; Hydrogen-Ion Concentration; Medicin och hälsovetenskap; Membrane proteins; Molecular Sequence Data; Oligonucleotide Array Sequence Analysis; Open reading frames; Pathology; Rodents; Sequence Analysis, DNA; Stomach Neoplasms - microbiology
• DOI: 10.1073/pnas.0603784103
• ISSN: 0027-8424

Helicobacter pylori produces acute superficial gastritis in nearly all of its human hosts. However, a subset of individuals develops chronic atrophic gastritis (ChAG), a condition characterized in part by diminished numbers of acid-producing parietal cells and increased risk for development of gastric adenocarcinoma. Previously, we used a gnotobiotic transgenic mouse model with an engineered ablation of parietal cells to show that loss of parietal cells provides an opportunity for a H. pylori isolate from a patient with ChAG (HPAG1) to bind to, enter, and persist within gastric stem cells. This finding raises the question of how ChAG influences H. pylori genome evolution, physiology, and tumorigenesis. Here we describe the 1,596,366-bp HPAG1 genome. Custom HPAG1 Affymetrix GeneChips, representing 99.6% of its predicted ORFs, were used for whole-genome genotyping of additional H. pylori ChAG isolates obtained from Swedish patients enrolled in a casecontrol study of gastric cancer, as well as ChAG- and cancerassociated isolates from an individual who progressed from ChAG to gastric adenocarcinoma. The results reveal a shared gene signature among ChAG strains, as well as genes that may have been lost or gained during progression to adenocarcinoma. Wholegenome transcriptional profiling of HPAG1's response to acid during in vitro growth indicates that genes encoding components of metal uptake and utilization pathways, outer membrane proteins, and virulence factors are among those associated with H. pylori's adaptation to ChAG.