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Deleted 4977-bp mitochondrial DNA mutation is associated with sporadic amyotrophic lateral sclerosis: a

Long-Sun Ro1, Shiao-Lin Lai, Chiung-Mei Chen

  • 1Department of Neurology, Chang Gung Memorial Hospital, 199 Tung Hwa North Road, Taipei, Taiwan 10591, ROC. cgrols@adm.cgmh.com.tw

Muscle & Nerve
|November 26, 2003
PubMed

Insights

The common 4977-bp deleted mitochondrial DNA (mtDNA) mutation is significantly more frequent in sporadic amyotrophic lateral sclerosis (ALS) patients. This finding suggests a potential link between mtDNA deletions and ALS occurrence, particularly in males.

Area of Science:

  • * Neuroscience
  • * Genetics
  • * Mitochondrial Biology

Background:

  • * Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease with complex etiology.
  • * Mitochondrial DNA (mtDNA) mutations are implicated in aging and various diseases.
  • * The 4977-bp deletion is a common mtDNA mutation associated with cellular dysfunction.

Purpose of the Study:

  • * To investigate the association between the 4977-bp deleted mtDNA mutation and sporadic ALS.
  • * To compare the prevalence and levels of this mtDNA mutation in ALS patients versus controls.

Main Methods:

  • * Primer-shift and quantitative polymerase chain reaction (PCR) assays were employed.
  • * Muscle specimens from 36 sporadic ALS patients and 69 age-matched controls were analyzed.
  • * Analysis focused on the detection and quantification of the 4977-bp deleted mtDNA.

Main Results:

  • * The 4977-bp deleted mtDNA mutation was significantly more frequent in ALS patients (50.0%) than controls (8.7%).
  • * The relative amount of deleted mtDNA was also significantly higher in ALS patients (0.35% vs. 0.085%).
  • * Individuals with deleted mtDNA had a higher risk of sporadic ALS, with males showing increased risk compared to females.

Conclusions:

  • * The 4977-bp deleted mtDNA mutation is significantly associated with the occurrence of sporadic ALS.
  • * This mtDNA mutation may serve as a risk factor or biomarker for sporadic ALS.
  • * Further research is warranted to elucidate the precise role of mtDNA deletions in ALS pathogenesis.

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