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Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
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Mitochondrial Dysfunction Causes Cell Death in Patients Affected by Fragile-X-Associated Disorders.

Martina Grandi1, Chiara Galber1,2, Cristina Gatto1

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Mitochondrial dysfunction and altered morphology are key in Fragile-X-related disorders (FXDs). These changes sensitize cells to apoptosis, suggesting mitochondria as potential therapeutic targets for FXD symptoms.

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ATP synthaseapoptosisdonut-shape mitochondriafragile-X-related disorders (FXDs)neurodegenerationpermeability transition pore

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Mitochondria are crucial for neurodevelopment and implicated in neurodegenerative diseases.
  • Fragile-X-related disorders (FXDs) stem from CGG repeat expansions in the FMR1 gene, affecting FMRP protein.
  • FXDs manifest in various forms, including premutation (PM), full mutation (FM), and unmethylated FM (UFM), with diverse neurological outcomes.

Purpose of the Study:

  • To investigate the role of mitochondrial mechanisms in FXD pathogenesis.
  • To analyze mitochondrial morphology and bioenergetics in fibroblasts from FXD patients.
  • To identify potential therapeutic targets for FXD symptoms.

Main Methods:

  • Fibroblast cell cultures from FXD patients (FM, PM, UFM) and controls.
  • Analysis of mitochondrial morphology using microscopy.
  • Assessment of mitochondrial bioenergetics, including oxidative phosphorylation.
  • Evaluation of apoptosis sensitivity and mitochondrial permeability transition.

Main Results:

  • Donut-shaped mitochondrial morphology and increased synthesis of mitochondrial proteins observed in FM, PM, and UFM cells.
  • Reduced in situ oxidative phosphorylation in PM fibroblasts.
  • Enhanced sensitivity to reactive oxygen species-induced apoptosis via mitochondrial permeability transition in all FXD models.

Conclusions:

  • Mitochondrial dysfunction and altered morphology are significant factors in FXD phenotypes.
  • FXD cells exhibit heightened susceptibility to apoptosis, linked to mitochondrial permeability transition.
  • Targeting mitochondrial pathways presents a promising therapeutic strategy for FXDs.