Decoupling Ecological and Pathogenic Roles: Helicobacter pylori as a Gastric Hegemon Maintaining Order or Amplifying Dysbiotic Chaos.

H. pylori acts as a context-dependent ecosystem modifier, reducing microbiome divergence alone but amplifying dysbiosis during gastric disease progression.

• Why it matters: Understanding H. pylori's dual role is crucial because it influences gastric microbiome stability and disease development, impacting strategies for managing gastric disorders and cancer risk.
• What they did: Researchers analyzed 756 gastric 16S rRNA gene profiles using Hill-number beta diversity across three schemes, comparing infection status and disease stages in H. pylori-positive and -negative cohorts.
• The result: H. pylori consistently homogenized microbiome variation, but disease progression, especially to gastric cancer, drove divergence; its presence amplified dysbiosis in precancerous stages, revealing a complex ecological role.