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mtDNA disease in the primary care setting.

B Spellberg1, R M Carroll, E Robinson

  • 1Department of Medicine, Harbor-UCLA Medical Center, 1000 W Carson St, Torrance, CA 90509, USA. bjs@humc.edu

Archives of Internal Medicine
|December 1, 2001
PubMed
Summary

Mitochondrial DNA (mtDNA) disorders are often missed. This case highlights diagnosing mitochondrial encephalopathy, lactic acidosis, and strokelike syndrome (MELAS) through integrated clinical, genetic, and biochemical testing.

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Area of Science:

  • Genetics
  • Neurology
  • Metabolic Disorders

Background:

  • Mitochondrial DNA (mtDNA) disorders frequently present in primary care but often remain undiagnosed.
  • Early diagnosis is crucial for genetic counseling, avoiding unnecessary tests, and managing symptoms.

Observation:

  • A 36-year-old male presented with a 15-year history of psychosis, seizures, and sensorineural hearing loss.
  • Family history included diabetes mellitus and heart disease, but no unifying diagnosis was established.

Findings:

  • Physiologic, biochemical, and genetic testing revealed impaired aerobic metabolism and mitochondrial electron transport defects.
  • An A-to-G point mutation at position 3243 in the mitochondrial leucine-tRNA gene confirmed MELAS (mitochondrial encephalopathy, lactic acidosis, and strokelike syndrome).

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Implications:

  • Diagnosing mtDNA disorders necessitates integrating clinical presentation, pedigree analysis, and multidisciplinary testing.
  • Accurate diagnosis facilitates targeted genetic counseling and symptomatic treatment, improving patient outcomes.
  • This case underscores the importance of considering mtDNA disorders in patients with complex, multi-system symptoms.