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AIF3 splicing variant elicits mitochondrial malfunction via the concurrent dysregulation of electron transport chain and glutathione-redox homeostasis

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Listed:
  • Mi Zhou

    (University of Texas Southwestern Medical Center)

  • Shuiqiao Liu

    (University of Texas Southwestern Medical Center)

  • Yanan Wang

    (University of Texas Southwestern Medical Center)

  • Bo Zhang

    (University of Texas Southwestern Medical Center)

  • Ming Zhu

    (University of Texas Southwestern Medical Center)

  • Jennifer E. Wang

    (University of Texas Southwestern Medical Center)

  • Veena Rajaram

    (University of Texas Southwestern Medical Center)

  • Yisheng Fang

    (University of Texas Southwestern Medical Center)

  • Weibo Luo

    (University of Texas Southwestern Medical Center
    UT Southwestern Medical Center)

  • Yingfei Wang

    (University of Texas Southwestern Medical Center
    UT Southwestern Medical Center
    UT Southwestern Medical Center)

Abstract

Genetic mutations in apoptosis-inducing factor (AIF) have a strong association with mitochondrial disorders; however, little is known about the aberrant splicing variants in affected patients and how these variants contribute to mitochondrial dysfunction and brain development defects. We identified pathologic AIF3/AIF3-like splicing variants in postmortem brain tissues of pediatric individuals with mitochondrial disorders. Mutations in AIFM1 exon-2/3 increase splicing risks. AIF3-splicing disrupts mitochondrial complexes, membrane potential, and respiration, causing brain development defects. Mechanistically, AIF is a mammalian NAD(P)H dehydrogenase and possesses glutathione reductase activity controlling respiratory chain functions and glutathione regeneration. Conversely, AIF3, lacking these activities, disassembles mitochondrial complexes, increases ROS generation, and simultaneously hinders antioxidant defense. Expression of NADH dehydrogenase NDI1 restores mitochondrial functions partially and protects neurons in AIF3-splicing mice. Our findings unveil an underrated role of AIF as a mammalian mitochondrial complex-I alternative NAD(P)H dehydrogenase and provide insights into pathologic AIF-variants in mitochondrial disorders and brain development.

Suggested Citation

  • Mi Zhou & Shuiqiao Liu & Yanan Wang & Bo Zhang & Ming Zhu & Jennifer E. Wang & Veena Rajaram & Yisheng Fang & Weibo Luo & Yingfei Wang, 2025. "AIF3 splicing variant elicits mitochondrial malfunction via the concurrent dysregulation of electron transport chain and glutathione-redox homeostasis," Nature Communications, Nature, vol. 16(1), pages 1-21, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57081-5
    DOI: 10.1038/s41467-025-57081-5
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    References listed on IDEAS

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    1. Jeffrey A. Klein & Chantal M. Longo-Guess & Marlies P. Rossmann & Kevin L. Seburn & Ronald E. Hurd & Wayne N. Frankel & Roderick T. Bronson & Susan L. Ackerman, 2002. "The harlequin mouse mutation downregulates apoptosis-inducing factor," Nature, Nature, vol. 419(6905), pages 367-374, September.
    2. Blanca Jiménez-Gómez & Patricia Ortega-Sáenz & Lin Gao & Patricia González-Rodríguez & Paula García-Flores & Navdeep Chandel & José López-Barneo, 2023. "Transgenic NADH dehydrogenase restores oxygen regulation of breathing in mitochondrial complex I-deficient mice," Nature Communications, Nature, vol. 14(1), pages 1-14, December.
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