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Volume 8, Issue 9

Changes to the upper gastrointestinal microbiotas of children with reflux oesophagitis and oesophageal metaplasia Open Access

Abstract

Little is known of the relationships among paediatric upper gastrointestinal microbiotas, and the impact of medication use and disease on their diversity. Here, we investigated the diversity of three microbiotas in the upper gastrointestinal tract of paediatric patients in relation to each other and to host factors. Oral, oesophageal and gastric microbiotas from a prospective paediatric cohort (=54) were profiled using the 16S rRNA gene and ITS2 amplicon sequencing. 16S rRNA gene amplicon sequencing of oesophageal biopsies from a retrospective paediatric cohort (=96) and shotgun metagenomics data from oesophageal brushings (=88) were employed for genomic signature validation. Bacterial diversity and composition showed substantial differences across oral, oesophageal and gastric fluid samples that were not replicated for fungi, and the presence of reflux led to increased homogeneity in the bacterial component of these three microbiotas. The oral and oesophageal microbiotas were associated with age, sex, history of oesophageal atresia and presence of oesophageal metaplasia, with the latter characterized by enrichment. Proton pump inhibitor use was associated with increased oral bacterial richness in the gastric fluid, and this correlated with increased levels of gastric pro-inflammatory cytokines. Profiling of oesophageal biopsies from a retrospective paediatric cohort confirmed an increased prevalence in samples with metaplasia. Analysis of metagenome-derived oesophageal genomes identified strain-specific features that were significantly increased in prevalence in samples with metaplasia. enrichment is a signature associated with paediatric oesophageal metaplasia, and proton pump inhibitor use substantially alters the paediatric gastric microenvironment.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): metaplasia , microbiota , oesophagus , paediatric and Prevotella
Funding
This study was supported by the:
  • University of New South Wales (Award Scientia fellowship)
    • Principle Award Recipient: NataliaCastaño-Rodríguez
  • Cancer Institute NSW (Award 2019/ECF1082)
    • Principle Award Recipient: NataliaCastaño-Rodríguez
  • University of New South Wales (Award Scientia fellowship)
    • Principle Award Recipient: NadeemOmar Kaakoush
  • Cancer Institute NSW (Award 15/CDF/1-11)
    • Principle Award Recipient: NadeemOmar Kaakoush
© 2022 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2022-09-15
2024-04-25
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Changes to the upper gastrointestinal microbiotas of children with reflux oesophagitis and oesophageal metaplasia
M Gen 8, 000870 (2022); https://doi.org/10.1099/mgen.0.000870
/content/journal/mgen/10.1099/mgen.0.000870
/content/journal/mgen/10.1099/mgen.0.000870
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