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Microbial Genetic Composition Tunes Host Longevity.

Bing Han1, Priya Sivaramakrishnan2, Chih-Chun J Lin1

  • 1Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.

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|June 17, 2017
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Summary
This summary is machine-generated.

Researchers identified 29 Escherichia coli gene deletions that extend lifespan in C. elegans. Five mutants promote longevity by increasing colanic acid (CA) secretion, which benefits host mitochondria and promotes healthy aging.

Keywords:
colanic acidlongevitymicrobiota-host interactionmitochondrial dynamicsmitochondrial unfolded protein responseprobiotics

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Area of Science:

  • Microbiology
  • Aging Research
  • Genetics

Background:

  • Gut microbiota homeostasis is crucial for host health and aging.
  • Genetically engineered probiotics offer a therapeutic strategy for healthy aging.

Purpose of the Study:

  • To identify bacterial genes that, when deleted, promote host longevity.
  • To elucidate the mechanisms by which these bacterial mutants enhance host healthspan.

Main Methods:

  • Screened 3,983 Escherichia coli mutants for effects on host longevity in Caenorhabditis elegans.
  • Investigated the molecular mechanisms, including metabolite secretion and host cellular responses.

Main Results:

  • Discovered 29 bacterial gene deletions that significantly increase host longevity.
  • Identified five mutants that promote longevity via increased colanic acid (CA) secretion.
  • Demonstrated that CA regulates host mitochondrial dynamics and unfolded protein response (UPRmt), conserved across species.

Conclusions:

  • Bacterial metabolites like CA can directly influence host mitochondrial function and promote longevity.
  • Identified specific bacterial targets for developing pro-longevity probiotics.
  • Established a link between gut microbes, CA, and host mitochondrial health during aging.