A novel mitochondrial ATP6 frameshift mutation causing isolated complex V deficiency, ataxia and encephalomyopathy.

Jackson, Christopher B; Hahn, Dagmar; Schröter, Barbara; Richter, Uwe; Battersby, Brendan J; Schmitt-Mechelke, Thomas; Marttinen, Paula; Nuoffer, Jean-Marc; Schaller, André (2017). A novel mitochondrial ATP6 frameshift mutation causing isolated complex V deficiency, ataxia and encephalomyopathy. European journal of medical genetics, 60(6), pp. 345-351. Elsevier 10.1016/j.ejmg.2017.04.006

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We describe a novel frameshift mutation in the mitochondrial ATP6 gene in a 4-year-old girl associated with ataxia, microcephaly, developmental delay and intellectual disability. A heteroplasmic frameshift mutation in the MT-ATP6 gene was confirmed in the patient's skeletal muscle and blood. The mutation was not detectable in the mother's DNA extracted from blood or buccal cells. Enzymatic and oxymetric analysis of the mitochondrial respiratory system in the patients' skeletal muscle and skin fibroblasts demonstrated an isolated complex V deficiency. Native PAGE with subsequent immunoblotting for complex V revealed impaired complex V assembly and accumulation of ATPase subcomplexes. Whilst northern blotting confirmed equal presence of ATP8/6 mRNA, metabolic 35S-labelling of mitochondrial translation products showed a severe depletion of the ATP6 protein together with aberrant translation product accumulation. In conclusion, this novel isolated complex V defect expands the clinical and genetic spectrum of mitochondrial defects of complex V deficiency. Furthermore, this work confirms the benefit of native PAGE as an additional diagnostic method for the identification of OXPHOS defects, as the presence of complex V subcomplexes is associated with pathogenic mutations of mtDNA.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Humangenetik
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Institute of Clinical Chemistry

UniBE Contributor:

Nuoffer, Jean-Marc and Schaller, André

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1878-0849

Publisher:

Elsevier

Language:

English

Submitter:

André Schaller

Date Deposited:

20 Feb 2018 14:32

Last Modified:

26 Oct 2019 12:05

Publisher DOI:

10.1016/j.ejmg.2017.04.006

PubMed ID:

28412374

Uncontrolled Keywords:

ATP synthase Complex V deficiency MT-ATP6 Mitochondrial DNA (mtDNA) Mitochondrial disease

BORIS DOI:

10.7892/boris.109375

URI:

https://boris.unibe.ch/id/eprint/109375

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