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Deep sequencing of mitochondrial DNA and characterization of a novel POLG mutation in a patient with arPEO.

Artikel i vetenskaplig tidskrift
Författare Carola Oldfors Hedberg
Bertil Macao
Swaraj Basu
Christopher Lindberg
Bradley Peter
Jay Uhler
Erik Larsson
Maria Falkenberg
Anders Oldfors
Publicerad i Neurology. Genetics
Volym 6
Nummer/häfte 1
ISSN 2376-7839
Publiceringsår 2020
Publicerad vid Institutionen för biomedicin, avdelningen för laboratoriemedicin
Institutionen för medicin
Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi
Språk en
Länkar dx.doi.org/10.1212/NXG.000000000000...
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Genetik

Sammanfattning

To determine the pathogenicity of a novel POLG mutation in a man with late-onset autosomal recessive progressive external ophthalmoplegia using clinical, molecular, and biochemical analyses.A multipronged approach with detailed neurologic examinations, muscle biopsy analyses, molecular genetic studies, and in vitro biochemical characterization.The patient had slowly progressive bilateral ptosis and severely reduced horizontal and vertical gaze. Muscle biopsy showed slight variability in muscle fiber size, scattered ragged red fibers, and partial cytochrome c oxidase deficiency. Biallelic mutations were identified in the POLG gene encoding the catalytic A subunit of POLγ. One allele carried a novel mutation in the exonuclease domain (c.590T>C; p.F197S), and the other had a previously characterized null mutation in the polymerase domain (c.2740A>C; p.T914P). Biochemical characterization revealed that the novel F197S mutant protein had reduced exonuclease and DNA polymerase activities and confirmed that T914P was inactive. By deep sequencing of mitochondrial DNA (mtDNA) extracted from muscle, multiple large-scale rearrangements were mapped and quantified.The patient's phenotype was caused by biallelic POLG mutations, resulting in one inactive POLγA protein (T914P) and one with decreased polymerase and exonuclease activity (F197S). The reduction in polymerase activity explains the presence of multiple pathogenic large-scale deletions in the patient's mtDNA.

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