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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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[A8344G mitochondrial DNA mutation observed in two generations].

Anett Fekete1, Kinga Hadzsiev1,2, Judit Bene1,2

  • 1Általános Orvostudományi Kar, Klinikai Központ, Orvosi Genetikai Intézet, Pécsi Tudományegyetem Pécs, József A. u. 7., 7623.

Orvosi Hetilap
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Summary

This study details a mother and daughter diagnosed with Myoclonic Epilepsy with Ragged-Red Fibers (MERRF) syndrome, highlighting the condition's wide phenotypic variation and underdiagnosis. Genetic analysis revealed a specific mitochondrial DNA mutation, emphasizing the need for increased awareness of these rare neurological disorders.

Keywords:
MERRFlipomamitochondrial DNAmitokondriális DNS

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Area of Science:

  • Genetics
  • Neurology
  • Mitochondrial Biology

Background:

  • Mitochondrial diseases are often underdiagnosed due to their diverse clinical presentations.
  • Myoclonic Epilepsy with Ragged-Red Fibers (MERRF) syndrome is a maternally inherited disorder characterized by specific neurological and myopathic symptoms.

Observation:

  • A 62-year-old mother and her 41-year-old daughter presented with severe, long-standing neurological symptoms.
  • Diagnostic investigations confirmed MERRF syndrome in both patients.
  • Genetic analysis identified a significant heteroplasmic A8344G mutation in the mitochondrial tRNA gene.

Findings:

  • The patients exhibited atypical MERRF syndrome features, including adult-onset and lipomas.
  • A high level of heteroplasmy (over 90%) was observed in the mitochondrial DNA mutation.
  • The genetic findings confirmed the diagnosis despite the unusual clinical presentation.

Implications:

  • This case underscores the broad phenotypic variability within mitochondrial disorders.
  • It highlights the importance of considering mitochondrial diseases even with non-classical symptoms.
  • The findings suggest that MERRF syndrome and other mitochondrial disorders may be significantly underdiagnosed, particularly in regions like Hungary.