A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Case report: a novel frameshift mutation in the mitochondrial cytochrome c oxidase II gene causing mitochondrial disorder
Tekijät: Laura Kytövuori, Mikko Kärppä, Hannu Tuominen, Johanna Uusimaa, Markku Saari, Reetta Hinttala, Kari Majamaa
Kustantaja: BIOMED CENTRAL LTD
Julkaisuvuosi: 2017
Lehti: BMC Neurology
Tietokannassa oleva lehden nimi: BMC NEUROLOGY
Lehden akronyymi: BMC NEUROL
Artikkelin numero: 96
Vuosikerta: 17
Sivujen määrä: 5
ISSN: 1471-2377
DOI: https://doi.org/10.1186/s12883-017-0883-5
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/25303173
Background: Mitochondrial cytochrome c oxidase 2, MT-CO2, encodes one of the three subunits, which form the catalytic core of cytochrome c oxidase (COX), complex IV. Mutations in MT-CO2 are rare and the associated phenotypes are variable including nonsyndromic and syndromic forms of mitochondrial diseases.Case presentation: We describe a 30-year-old man with cognitive decline, epilepsy, psychosis, exercise intolerance, sensorineural hearing impairment, retinitis pigmentosa, cataract and lactic acidosis. COX-deficient fibers and ragged red fibers were abundant in the muscle. Sequencing of mitochondrial DNA (mtDNA) revealed a novel frameshift mutation m.8156delG that was predicted to cause altered C-terminal amino acid sequence and to lead to truncation of the COX subunit 2. The deletion was heteroplasmic being present in 26% of the mtDNA in blood, 33% in buccal mucosa and 95% in muscle. Deletion heteroplasmy correlated with COX-deficiency in muscle histochemistry. The mother and the siblings of the proband did not harbor the deletion.Conclusions: The clinical features and muscle histology of the proband suggested a mitochondrial disorder. The m.8156delG deletion is a new addition to the short list of pathogenic mutations in the mtDNA-encoded subunits of COX. This case illustrates the importance of mtDNA sequence analysis in patients with an evident mitochondrial disorder.
Avainsanat:
Case report, Cytochrome c oxidase deficiency, Mitochondrial diseases, neuromuscular disorders
Ladattava julkaisu This is an electronic reprint of the original article. |  |
