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Kearns-Sayre syndrome: different amounts of deleted mitochondrial DNA are present in several autoptic tissues

C Ponzetto1, N Bresolin, A Bordoni

  • 1Dipartimento di Scienze Biomediche e Oncologia Umana, Università di Torino, Italy.

Journal of the Neurological Sciences
|May 1, 1990
PubMed

Insights

Kearns-Sayre Syndrome (KSS) is linked to deleted mitochondrial DNA (mtDNA) found across multiple organs. This widespread genetic alteration supports the theory that KSS originates in the oocyte or early embryo.

Area of Science:

  • Genetics
  • Neurology
  • Mitochondrial Biology

Background:

  • Kearns-Sayre Syndrome (KSS) is a rare multisystem disorder.
  • Mitochondrial DNA (mtDNA) alterations are implicated in various genetic diseases.
  • Previous research suggested a genetic basis for KSS.

Purpose of the Study:

  • To investigate the presence and distribution of deleted mitochondrial DNA (mtDNA) in a patient with Kearns-Sayre Syndrome (KSS).
  • To correlate the occurrence of mtDNA deletions with the multisystemic manifestations of KSS.
  • To provide further support for the hypothesis of an early embryonic or oocyte origin for KSS.

Main Methods:

  • Autoptic tissue samples (muscle, heart, cortex, cerebellum, liver, kidney) were analyzed.
  • Quantitative assessment of deleted mitochondrial DNA (mtDNA) populations was performed across different tissues.

Main Results:

  • A population of deleted mitochondrial DNA (mtDNA) was detected in all analyzed tissues from the KSS patient.
  • The amount of deleted mtDNA varied across the different organs examined.
  • The widespread distribution of the deletion was observed.

Conclusions:

  • The presence of deleted mtDNA in multiple organs supports the multisystemic nature of KSS.
  • These findings strengthen the hypothesis that KSS is a genetic disorder caused by mtDNA alterations.
  • The presumed origin of these mtDNA alterations is the oocyte or early embryonic development.

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