Mitochondrial DNA triplication and punctual mutations in patients with mitochondrial neuromuscular disorders

Research output: Contribution to journalArticle

Abstract

Mitochondrial diseases are a heterogeneous group of disorders caused by the impairment of the mitochondrial oxidative phosphorylation system which have been associated with various mutations of the mitochondrial DNA (mtDNA) and nuclear gene mutations. The clinical phenotypes are very diverse and the spectrum is still expanding. As brain and muscle are highly dependent on OXPHOS, consequently, neurological disorders and myopathy are common features of mtDNA mutations. Mutations in mtDNA can be classified into three categories: large-scale rearrangements, point mutations in tRNA or rRNA genes and point mutations in protein coding genes. In the present report, we screened mitochondrial genes of complex I, III, IV and V in 2 patients with mitochondrial neuromuscular disorders. The results showed the presence the pathogenic heteroplasmic m.9157G>A variation (A211T) in the MT-ATP6 gene in the first patient. We also reported the first case of triplication of 9 bp in the mitochondrial NC7 region in Africa and Tunisia, in association with the novel m.14924T>C in the MT-CYB gene in the second patient with mitochondrial neuromuscular disorder.

Details

Authors
  • Emna Mkaouar-Rebai
  • Rahma Felhi
  • Mouna Tabebi
  • Olfa Alila-Fersi
  • Imen Chamkha
  • Marwa Maalej
  • Marwa Ammar
  • Fatma Kammoun
  • Leila Keskes
  • Mongia Hachicha
  • Faiza Fakhfakh
External organisations
  • University of Sfax
Research areas and keywords

Keywords

  • Amino Acid Sequence, Base Sequence, Child, Cytochromes b, DNA, Mitochondrial, Female, Genes, Mitochondrial, Humans, Male, Mitochondria, Mitochondrial Diseases, Mitochondrial Proton-Translocating ATPases, Molecular Sequence Data, Mutation, Neuromuscular Diseases, Point Mutation
Original languageEnglish
Pages (from-to)578-85
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume473
Issue number2
Publication statusPublished - 2016 Apr 29
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes