Vancomycin

Overview

Vancomycin is a glycopeptide antibiotic targeting Gram-positive bacteria by binding D-Ala-D-Ala of peptidoglycan precursors. It is the last-resort treatment for MRSA and oral vancomycin is first-line for severe clostridioides difficile infection. In the WikiBiome framework, vancomycin exemplifies the antibiotic-microbiome paradox: it treats C. difficile but causes profound dysbiosis that increases future C. difficile recurrence risk.

Microbiome Impact

  • Vancomycin dramatically reduces Gram-positive commensals (Firmicutes, especially lachnospiraceae, ruminococcaceae) while sparing Gram-negatives → Proteobacteria bloom.
  • Early-life vancomycin exposure alters gut microbiome development and increases autoimmune diabetes risk in NOD mice [1].
  • Destroys colonization resistance → enables secondary infections [2].

VRE and Metal Co-Selection

Vancomycin-resistant enterococcus (VRE) is a critical AMR threat. The vanA resistance gene co-locates with mercury and arsenic resistance genes on the same mobile genetic elements — meaning environmental metal exposure selects for vancomycin resistance without antibiotic exposure [3]. This is the paradigm case for co selection.

Cross-References

References (5)

  1. Sophie Candon, Alicia Perez-Arroyo, Cindy Marquet et al. (2015). Candon 2015 — Antibiotics in Early Life Alter the Gut Microbiome and Increase Disease Incidence in a Spontaneous Mouse Model of Autoimmune Diabetes. PLoS ONE. doi:10.1371/journal.pone.0125448
  2. Aleksandr Bing, Nathaniel L. Ritz, Henry C. Lin (2019). Bing, Ritz & Lin 2019 — The Unknown Effect of Antibiotic-Induced Dysbiosis on the Gut Microbiota. Microbiome and Metabolome in Diagnosis, Therapy, and other Strategic Applications (Book Chapter). doi:10.1016/B978-0-12-812196-0.00020-8
  3. Rebelo A, Mourao J, Freitas AR et al. (2021). Diversity of metal and antibiotic resistance genes in Enterococcus spp. from the last century reflects multiple pollution and genetic exchange among phyla from overlapping ecosystems. Science of the Total Environment. doi:10.1016/j.scitotenv.2020.142710
  4. Kong C, Yan X, Liu Y et al. (2021). Ketogenic Diet Alleviates Colitis by Reduction of Colonic Group 3 Innate Lymphoid Cells Through Altering Gut Microbiome. Signal Transduction and Targeted Therapy. doi:10.1038/s41392-021-00549-9
  5. Arpana Gupta, Vadim Osadchiy, Emeran A. Mayer (2020). Gupta, Osadchiy & Mayer 2020 — Brain-Gut-Microbiome Interactions in Obesity and Food Addiction. Nature Reviews Gastroenterology & Hepatology. doi:10.1038/s41575-020-0341-5

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