In Vivo Analysis of the Viable Microbiota and Helicobacter pylori Transcriptome in Gastric Infection and Early Stages of Carcinogenesis

Kaisa Thorell, Johan Bengtsson-Palme, Oscar Hsin-Fu Liu, Reyna Victoria Palacios Gonzales, Intawat Nookaew, Linda Rabeneck, Lawrence Paszat, David Y. Graham, Jens Nielsen, Samuel B. Lundin, Asa Sjoling

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15 Citations (Scopus)

Abstract

Emerging evidence shows that the human microbiota plays a larger role in disease progression and health than previously anticipated. Helicobacter pylori, the causative agent of gastric cancer and duodenal and gastric ulcers, was early associated with gastric disease, but it has also been proposed that the accompanying microbiota in Helicobacter pylori-infected individuals might affect disease progression and gastric cancer development. In this study, the composition of the transcriptionally active microbial community and H. pylori gene expression were determined using metatranscriptomic RNA sequencing of stomach biopsy specimens from individuals with different H. pylori infection statuses and premalignant tissue changes. The results show that H. pylori completely dominates the microbiota not only in infected individuals but also in most individuals classified as H. pylori uninfected using conventional methods. Furthermore, H. pylori abundance is positively correlated with the presence of Campylobacter, Deinococcus, and Sulfurospirillum. Finally, we quantified the expression of a large number of Helicobacter pylori genes and found high expression of genes involved in pH regulation and nickel transport. Our study is the first to dissect the viable microbiota of the human stomach by metatranscriptomic analysis, and it shows that metatranscriptomic analysis of the gastric microbiota is feasible and can provide new insights into how bacteria respond in vivo to variations in the stomach microenvironment and at different stages of disease progression.

Original languageEnglish
Article numberARTN e00031-17
Number of pages15
JournalInfection and Immunity
Volume85
Issue number10
DOIs
Publication statusPublished - Oct 2017

Cite this

Thorell, K., Bengtsson-Palme, J., Liu, O. H-F., Gonzales, R. V. P., Nookaew, I., Rabeneck, L., Paszat, L., Graham, D. Y., Nielsen, J., Lundin, S. B., & Sjoling, A. (2017). In Vivo Analysis of the Viable Microbiota and Helicobacter pylori Transcriptome in Gastric Infection and Early Stages of Carcinogenesis. Infection and Immunity, 85(10), [ARTN e00031-17]. https://doi.org/10.1128/IAI.00031-17