The association between haematological manifestation and mtDNA deletions in Pearson syndrome

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  • K. Muraki
    Department of Pediatrics Hiroshima University School of Medicine Kodaira, Tokyo Japan
  • S. Nishimura
    Department of Pediatrics Hiroshima University School of Medicine Kodaira, Tokyo Japan
  • Y. Goto
    Department of Ultrastructural Research National Institute of Neuroscience, National Center of Neurology and Psychiatry Kodaira, Tokyo Japan
  • I. Nonaka
    Department of Ultrastructural Research National Institute of Neuroscience, National Center of Neurology and Psychiatry Kodaira, Tokyo Japan
  • N. Sakura
    Department of Pediatrics Hiroshima University School of Medicine Kodaira, Tokyo Japan
  • K. Ueda
    Department of Pediatrics Hiroshima University School of Medicine Kodaira, Tokyo Japan

Abstract

<jats:title>Abstract</jats:title><jats:p>We studied the proportion of deleted mitochondrial DNA in blood cells from patients with Pearson syndrome. Patient 1 is a 17‐year‐old female with Kearns‐Sayre syndrome who survived Pearson syndrome. Patient 2 is a 5‐year‐old boy with Pearson syndrome who recovered from refractory anaemia but continues to have thrombocytopenia and neutropenia. Patient 3 is a female neonate who died with severe acidosis and pancytopenia at 14 days of age. Southern blot analysis was performed with total DNA from three patients' blood cells and two samples of bone marrow cells from one patient. In peripheral blood, patients with a higher proportion of deleted mitochondrial DNA had lower blood cell counts. In patient 2, the percentage of mutant mitochondrial DNA in bone marrow cells decreased as anaemia improved. This indicates that the proportion of deleted mitochondrial DNA in peripheral blood and in bone narrow has a tendency to correlate to the severity of haematological manifestation.</jats:p>

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