Progressive external ophthalmoplegia, autosomal dominant 6
PEO, autosomal dominant 6

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Prevalence of clinical parameters (%)







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List of symptoms



Symptom/sign Organ system Percent affected Pubmed id Added on(yyyy-mm-dd) Edit/add reference
Muscle weakness skeletal 100 % 23352259 2014-07-28
Myopathy skeletal 100 % 23352259 2014-07-28
COX negative fibres skeletal 100 % 23352259 2014-07-28
Ptosis nervous 75 % 23352259 2014-07-28
Myalgia skeletal 75 % 23352259 2014-07-28
Exercise intolerance multi 50 % 23352259 2014-07-28
Ophthalmoplegia nervous 50 % 23352259 2014-07-28
Psychiatric symptom nervous 50 % 23352259 2014-07-28
Hypotonia skeletal 25 % 23352259 2014-07-28
Ragged red fibres skeletal 25 % 23352259 2014-07-28



List of references:


Mutations in DNA2 link progressive myopathy to mitochondrial DNA instability.
Dario Ronchi, Alessio Di Fonzo, Weiqiang Lin, Andreina Bordoni, Changwei Liu, Elisa Fassone, Serena Pagliarani, Mafalda Rizzuti, Li Zheng, Massimiliano Filosto, Maria Teresa Ferrò, Michela Ranieri, Francesca Magri, Lorenzo Peverelli, Hongzhi Li, Yate-Ching Yuan, Stefania Corti, Monica Sciacco, Maurizio Moggio, Nereo Bresolin, Binghui Shen, Giacomo Pietro Comi,

Syndromes associated with multiple mtDNA deletions are due to different molecular defects that can result in a wide spectrum of predominantly adult-onset clinical presentations, ranging from progressive external ophthalmoplegia (PEO) to multisystemic disorders of variable severity. The autosomal-dominant form of PEO is genetically heterogeneous. Recently, causative mutations have been reported in several nuclear genes that encode proteins of the mtDNA replisome machinery (POLG, POLG2, and C10orf2) or that are involved in pathways for the synthesis of deoxyribonuclotides (ANT1 and RRM2B). Despite these findings, putative mutations remain unknown in half of the subjects with PEO. We report the identification, by exome sequencing, of mutations in DNA2 in adult-onset individuals with a form of mitochondrial myopathy featuring instability of muscle mtDNA. DNA2 encodes a helicase/nuclease family member that is most likely involved in mtDNA replication, as well as in the long-patch base-excision repair (LP-BER) pathway. In vitro biochemical analysis of purified mutant proteins revealed a severe impairment of nuclease, helicase, and ATPase activities. These results implicate human DNA2 and the LP-BER pathway in the pathogenesis of adult-onset disorders of mtDNA maintenance.

American journal of human genetics - Feb 2013