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Electron Transport Chain: Complex III and IV

During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
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Published on: July 20, 2022

Human CoQ10 deficiencies.

C M Quinzii1, L C López, A Naini

  • 1Department of Neurology, Columbia University Medical Center, New York, NY 10032, USA.

Biofactors (Oxford, England)
|December 20, 2008
PubMed
Summary
This summary is machine-generated.

Coenzyme Q10 (CoQ10) deficiencies are linked to various neurological and muscle disorders. Genetic defects in CoQ10 biosynthesis or related pathways cause these conditions, with more genetic causes yet to be discovered.

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Area of Science:

  • Biochemistry
  • Genetics
  • Cell Biology

Background:

  • Coenzyme Q10 (CoQ10), or ubiquinone, is vital for cellular energy production, functioning in mitochondrial electron transport.
  • CoQ10 deficiencies are associated with distinct clinical syndromes, including encephalomyopathy, infantile multisystemic disease, cerebellar ataxia, and pure myopathy.

Purpose of the Study:

  • To review the known genetic causes of Coenzyme Q10 deficiencies.
  • To highlight the diverse clinical phenotypes associated with these deficiencies.
  • To emphasize the ongoing search for novel genetic defects.

Main Methods:

  • Literature review of genetic mutations and associated clinical phenotypes of CoQ10 deficiencies.
  • Analysis of identified genes involved in primary and secondary CoQ10 deficiency pathways.

Main Results:

  • Primary CoQ10 deficiencies result from mutations in ubiquinone biosynthesis genes (e.g., COQ2, PDSS1, PDSS2, ADCK3).
  • Secondary CoQ10 deficiencies arise from mutations in unrelated genes (e.g., APTX, ETFDH, BRAF), affecting patients with ataxia, myopathy, and cardiofaciocutaneous syndrome.
  • The genetic basis for many CoQ10 deficiencies remains unidentified.

Conclusions:

  • Genetic defects in ubiquinone biosynthesis and related pathways underlie CoQ10 deficiency disorders.
  • Identifying causative genes is crucial for understanding disease mechanisms and developing targeted therapies.
  • Further research is needed to uncover additional genetic causes of CoQ10 deficiencies.