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Inactivation of Pif1 helicase causes a mitochondrial myopathy in mice

Sylvie Bannwarth1, Laetitia Berg-Alonso2, Gaëlle Augé1

  • 1IRCAN, CNRS UMR 7284/INSERM U1081/UNS, Faculté de Médecine, Nice, France; Service de Génétique Médicale, Hôpital Archet 2, CHU de Nice, Nice, France.

Mitochondrion
|March 1, 2016
PubMed

Insights

Inactivating the mitochondrial helicase Pif1 causes mitochondrial myopathy and impaired DNA repair in mice. This finding suggests Pif1 may be a target for treating mitochondrial DNA instability disorders.

Area of Science:

  • Mitochondrial biology
  • Genetics
  • Molecular medicine

Background:

  • Mutations in mitochondrial helicase genes like TWINKLE and DNA2 are linked to mitochondrial myopathies and mtDNA instability.
  • Mitochondrial helicases play crucial roles in maintaining the integrity of mitochondrial DNA (mtDNA).

Purpose of the Study:

  • To investigate the role of Pif1, a mitochondrial helicase, in mitochondrial function and mtDNA stability.
  • To determine the effects of Pif1 inactivation on mouse models and cellular systems.

Main Methods:

  • Generation and analysis of Pif1-deficient mice (pif1-/-).
  • Assessment of respiratory chain function in affected animals.
  • Evaluation of mtDNA repair capacity in mouse embryonic fibroblasts following oxidative stress.
  • Complementation studies using the mitochondrial isoform of Pif1 (mPif1(67)).

Main Results:

  • Pif1 inactivation in mice leads to mitochondrial myopathy and respiratory chain deficiency.
  • Pif1 deficiency impairs the repair of oxidative stress-induced mtDNA damage.
  • Complementation with mPif1(67) partially rescues the mtDNA repair defect.

Conclusions:

  • Pif1 is essential for maintaining mtDNA integrity and repair capacity.
  • Pif1 dysfunction contributes to mitochondrial myopathy phenotypes.
  • Targeting Pif1 may offer new therapeutic strategies for mtDNA instability disorders.
Keywords:
Mitochondrial diseaseMitochondrial myopathyPif1 helicasemtDNA instability

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