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Related Experiment Videos

Mitochondrial DNA analysis in Parkinson's disease.

A H Schapira1, I J Holt, M Sweeney

  • 1Department of Neurological Science, Royal Free Hospital School of Medicine, London, England.

Movement Disorders : Official Journal of the Movement Disorder Society
|January 1, 1990
PubMed
Summary

Parkinson's disease is linked to reduced activity in nicotinamide adenine dinucleotide coenzyme Q reductase (Complex I). Genetic analysis revealed no major deletions but identified novel polymorphisms in patients with Parkinson's disease.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Reduced activity of nicotinamide adenine dinucleotide coenzyme Q reductase (Complex I) is observed in the substantia nigra of Parkinson's disease patients.
  • This defect mirrors the biochemical changes induced by the neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), a known cause of parkinsonism.

Purpose of the Study:

  • To investigate potential genetic causes for Complex I deficiency in Parkinson's disease.
  • To analyze substantia nigra DNA for deletions or polymorphisms in patients with Parkinson's disease.

Main Methods:

  • Restriction fragment analysis was performed on substantia nigra DNA from six Parkinson's disease patients.
  • DNA samples from control brains (n=6) and blood (n=34) were used for comparison.

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Main Results:

  • No major deletions in Complex I related genes were detected in the DNA of Parkinson's disease patients.
  • Two novel polymorphisms, not present in control samples, were identified in the substantia nigra DNA of two patients.

Conclusions:

  • The study did not find evidence of major deletions in Complex I genes in Parkinson's disease patients.
  • Novel polymorphisms in Complex I genes may be associated with Parkinson's disease, warranting further investigation.