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Multimodal analysis identifies microbiome changes linked to stem cell transplantation-associated diseases.

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This study reveals specific microbiome alterations, including beneficial microbe depletion and harmful bacteria expansion, that predict complications after allogeneic hematopoietic stem cell transplantation (allo-HSCT). These findings offer new targets for microbiome-based prevention strategies.

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Area of Science:

  • Microbiology
  • Immunology
  • Computational Biology

Background:

  • Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a curative therapy for hematological malignancies but is limited by complications like graft-versus-host disease (GVHD) and infections.
  • Microbiome alterations are linked to allo-HSCT complications, yet previous studies using single techniques limit comprehensive understanding.

Purpose of the Study:

  • To comprehensively define microbiome changes across multiple modalities (taxa, functions, metabolites) following allo-HSCT.
  • To investigate the interactions within the microbiome (interactome) and their relationship with allo-HSCT complications.
  • To identify microbial features that predict the development of GVHD and infections.

Main Methods:

  • Integrated multi-omic approaches: 16S rRNA and shotgun sequencing, targeted and untargeted metabolomics.
  • Machine learning and multivariate analyses to identify significant microbiome changes and interactions.
  • Analysis of bacterial taxa, encoded functions, and metabolites in relation to allo-HSCT outcomes.

Main Results:

  • Significant microbiome shifts observed in all modalities post-allo-HSCT, including depletion of beneficial Clostridiales and loss of key metabolic functions.
  • Expansion of opportunistic pathogens like Staphylococcus species, potentially linked to reduced short-chain fatty acids (SCFAs).
  • Specific microbial and metabolic alterations identified in patients who developed GVHD, such as depletion of anti-inflammatory commensals and immunoregulatory metabolites.

Conclusions:

  • Identified specific microbiome changes and their interactions that precede allo-HSCT complications.
  • These microbial features represent novel targets for developing microbiome-based strategies to prevent post-transplant diseases.
  • The study highlights the importance of multi-omic and interactome analyses for understanding microbiome-driven complications.