From:  Microbiota–mitochondria crosstalk in the gut–brain axis: a missing link in the etiology and treatment of major depressive disorder

 Summary of key challenge areas.

Challenge areaResearch priorityPotential outcome
Microbiota variabilityStratify patients based on microbiota–host profilesPrecision psychobiotic therapy
Biomarker identificationDevelop composite microbial–mitochondrial panelsEarly diagnosis and response monitoring
Multi-omics integrationCombine metagenomic, proteomic, and metabolomic dataNetwork-level understanding of MDD
AI in psychiatryPredict individualized treatment responseDigital microbiome–mitochondria modeling
Ethics and translationEstablish global safety and equity standardsEthical and accessible implementation

MDD: major depressive disorder.