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CHCHD2 and CHCHD10 regulate mitochondrial dynamics and integrated stress response.

Yu Ruan1,2,3, Jiaqiao Hu1,2, Yaping Che1,2

  • 1The Sixth Affiliated Hospital of Jinan University, Jinan University, Dongguan, Guangdong, 523560, China.

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CHCHD2 and CHCHD10 proteins suppress mitochondrial stress responses by inhibiting the mitochondrial integrated stress response (mtISR). Their dysfunction is linked to neurodegenerative diseases like Parkinson's and ALS.

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Area of Science:

  • Cellular Biology
  • Neuroscience
  • Mitochondrial Biology

Background:

  • Mitochondrial dysfunction is a key factor in neurological disorders.
  • Mutations in CHCHD2 and CHCHD10 are linked to Parkinson's disease and ALS/FTD.
  • The roles of CHCHD2 and CHCHD10 in cellular stress remain unclear.

Purpose of the Study:

  • To elucidate the physiological and pathological functions of CHCHD2 and CHCHD10.
  • To investigate the role of CHCHD2 and CHCHD10 in regulating mitochondrial stress responses.
  • To identify CHCHD2 and CHCHD10 as potential therapeutic targets for neurodegenerative diseases.

Main Methods:

  • Protein interaction studies (CHCHD2/CHCHD10 with OMA1 and eIF2a).
  • Mitochondrial stress induction using CCCP.
  • Analysis of mitochondrial integrated stress response (mtISR) activation.
  • Gene knockdown experiments for CHCHD2 and CHCHD10.

Main Results:

  • CHCHD2 and CHCHD10 interact with OMA1, suppressing its activity and thus restraining mtISR initiation and OPA1 processing.
  • Under stress, CHCHD2 and CHCHD10 translocate to the cytosol, interacting with eIF2a to attenuate mtISR overactivation.
  • Knockdown of CHCHD2/CHCHD10 triggers and enhances mtISR, especially under stress.

Conclusions:

  • CHCHD2 and CHCHD10 function as mitochondrial "mtISR suppressors" in mammalian cells.
  • These proteins play a critical role in regulating cellular responses to mitochondrial stress.
  • Dysregulation of CHCHD2/CHCHD10 contributes to neurodegenerative disorders linked to their mutations.