Development of Leigh syndrome with a high probability of cardiac manifestations in infantile-onset patients with m.14453G > A.

Mitochondrion

Center for Medical Genetics, Department of Metabolism, Chiba Children's Hospital, 579-1 Heta-cho Midori-ku, Chiba 266-0007, Japan; Diagnostics and Therapeutic of Intractable Diseases, Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, Hongo 2-1-1 Bunkyo-ku, Tokyo 113-8421, Japan. Electronic address:

Published: March 2022

AI Article Synopsis

  • The m.14453G > A mutation in MT-ND6 is linked to mitochondrial conditions like Leigh syndrome, but its full clinical and molecular impact remains unclear.
  • Four infantile patients with this mutation were studied, all showing brainstem and basal ganglia lesions, with some also experiencing heart issues.
  • The study found reduced ND6 protein expression in patient samples, but did not establish a clear link between mutation levels and the age of onset or symptoms, although infantile onset was distinctly associated with Leigh syndrome.

Article Abstract

The m.14453G > A mutation in MT-ND6 has been described in a few patients with mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes or Leigh syndrome.However, the clinical spectrum and molecular characteristics are unclear.Here, we present four infantile-onset patients with m.14453G > A-associated Leigh syndrome. All four patients had brainstem lesions with basal ganglia lesions, and two patients had cardiac manifestations. Decreased ND6 protein expression and immunoreactivity were observed in patient-derived samples. There was no clear correlation between heteroplasmy levels and onset age or between heteroplasmy levels and phenotype; however, infantile onset was associated with Leigh syndrome.

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Source
http://dx.doi.org/10.1016/j.mito.2021.12.005DOI Listing

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