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Related Experiment Video

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Selection and Characterization of Palmitic Acid Responsive Patients with an OXPHOS Complex I Defect.

Tom E J Theunissen1,2, Mike Gerards3, Debby M E I Hellebrekers1

  • 1Department of Clinical Genetics, Maastricht University Medical Centre, Maastricht, Netherlands.

Frontiers in Molecular Neuroscience
|November 3, 2017
PubMed
Summary

A high-fat diet may benefit patients with complex I deficiency, a common mitochondrial disorder. This study identified a genetic cause and demonstrated that specific fatty acids can improve mitochondrial function, offering a potential method for patient selection for this therapeutic diet.

Keywords:
TMEM126Bassembly factorscomplex I deficiencyhigh-fat dietpalmitic acid

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Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • Mitochondrial disorders, particularly complex I deficiency, lack effective treatments.
  • Clinical observations suggest benefits from ketogenic or high-fat diets in some patients.
  • The precise mechanisms and patient selection criteria for dietary interventions remain unclear.

Purpose of the Study:

  • To investigate the genetic basis of complex I deficiency in a patient.
  • To determine the impact of a high-fat diet on mitochondrial function in complex I deficiency.
  • To develop a cellular assay for predicting patient response to dietary therapy.

Main Methods:

  • Whole-exome sequencing to identify genetic mutations.
  • Fibroblast complementation studies to confirm pathogenicity.
  • Assessment of oxidative phosphorylation (OXPHOS) capacity with specific fatty acids (palmitic and oleic acid).
  • Testing various patient-derived fibroblasts with characterized complex I defects.

Main Results:

  • A pathogenic homozygous p.G212V mutation in the TMEM126B gene was identified, causing incomplete complex I assembly.
  • The patient showed clinical improvement and increased muscle endurance on a high-fat diet.
  • Palmitic acid significantly increased maximal OXPHOS capacity in TMEM126B-deficient fibroblasts.
  • Fibroblasts with early complex I assembly defects (NDUFS7, NDUFAF5) responded to palmitic acid, while late assembly defects did not.

Conclusions:

  • A high-fat diet can be clinically and biochemically beneficial for patients with complex I deficiency.
  • TMEM126B mutations impair complex I assembly, and palmitic acid can partially restore function.
  • A cell line assay using fatty acid treatment shows promise for selecting patients who may benefit from a high-fat diet.