Genes and pathways involved in adult onset disorders featuring muscle mitochondrial DNA instability

Naghia Ahmed, Dario Ronchi, Giacomo Pietro Comi

Research output: Contribution to journalArticlepeer-review


Replication and maintenance of mtDNA entirely relies on a set of proteins encoded by the nuclear genome, which include members of the core replicative machinery, proteins involved in the homeostasis of mitochondrial dNTPs pools or deputed to the control of mitochondrial dynamics and morphology. Mutations in their coding genes have been observed in familial and sporadic forms of pediatric and adult-onset clinical phenotypes featuring mtDNA instability. The list of defects involved in these disorders has recently expanded, including mutations in the exo-/endo-nuclease flap-processing proteins MGME1 and DNA2, supporting the notion that an enzymatic DNA repair system actively takes place in mitochondria. The results obtained in the last few years acknowledge the contribution of next-generation sequencing methods in the identification of new disease loci in small groups of patients and even single probands. Although heterogeneous, these genes can be conveniently classified according to the pathway to which they belong. The definition of the molecular and biochemical features of these pathways might be helpful for fundamental knowledge of these disorders, to accelerate genetic diagnosis of patients and the development of rational therapies. In this review, we discuss the molecular findings disclosed in adult patients with muscle pathology hallmarked by mtDNA instability.

Original languageEnglish
Pages (from-to)18054-18076
Number of pages23
JournalInternational Journal of Molecular Sciences
Issue number8
Publication statusPublished - Aug 5 2015


  • Adult mitochondrial disorders
  • Mitochondrial myopathy
  • mtDNA maintenance
  • Multiple mtDNA deletions
  • Progressive external ophthalmoplegia

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Spectroscopy
  • Inorganic Chemistry
  • Catalysis
  • Molecular Biology
  • Computer Science Applications


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