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A feedback loop engaging propionate catabolism intermediates controls mitochondrial morphology.

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D-2-Hydroxyglutarate (D-2HG) accumulation damages mitochondria by increasing toxic 3-hydroxypropionate (3-HP). This metabolite, 3-HP, disrupts mitochondrial membrane proteins, revealing a new disease pathway.

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Area of Science:

  • Mitochondrial biology
  • Metabolic disorders
  • Developmental biology

Background:

  • D-2-Hydroxyglutarate (D-2HG) is a metabolite linked to developmental disorders.
  • The precise mechanisms by which D-2HG impacts mitochondrial function remain largely unelucidated.

Purpose of the Study:

  • To investigate how D-2HG causes mitochondrial damage.
  • To identify the molecular players involved in D-2HG toxicity.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Investigated the roles of D-2HG dehydrogenase (DHGD-1) and 3-hydroxypropionate (3-HP) dehydrogenase (HPHD-1).
  • Examined the interaction of 3-HP with MICOS subunit MIC60.

Main Results:

  • Loss of DHGD-1 in C. elegans led to D-2HG accumulation and mitochondrial damage.
  • Excess D-2HG caused 3-HP buildup by inhibiting HPHD-1.
  • 3-HP was found to bind MIC60, impairing its membrane-binding and shaping functions.
  • Dietary and gut bacteria influence host 3-HP production and mitochondrial health.

Conclusions:

  • Established a feedback loop connecting D-2HG and 3-HP toxicity to mitochondrial dysfunction.
  • Provided mechanistic insights into D-2HG and 3-HP related human diseases.
  • Highlighted the role of gut microbiota in modulating mitochondrial health through metabolite production.