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Krylova TD, Sheremet NL, Tabakov VY, Lyamzaev KG, Itkis YS, Tsygankova PG, Andreeva NA, Shmelkova MS, Nevinitsyna TA, Kadyshev VV, Zakharova EY. Three rare pathogenic mtDNA substitutions in LHON patients with low heteroplasmy. Mitochondrion 2019; 50:139-144. [PMID: 31669237 DOI: 10.1016/j.mito.2019.10.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 09/25/2019] [Accepted: 10/02/2019] [Indexed: 10/25/2022]
Abstract
In this article we present clinical, molecular and biochemical investigations of three patients with LHON caused by rare point substitutions in mtDNA. One patient harbours the known mtDNA mutation (m.13513 G>A), the others have new variants (m.13379 A>G in MT-ND5 gene and m.14597 A>G in MT-ND6 gene, which has never been previously associated with LHON). NGS analysis of a whole mtDNA derived from patient's blood revealed a low mutation load (24%, 47%, 23% respectively). Our data, including family segregation analysis, measurement of reactive oxygen species (ROS) production and cytotoxic effect of paraquat and high-resolution respirometry, showed that nucleotide variant m.14597 A>G can be classified as pathogenic mutation.
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Affiliation(s)
- Tatiana D Krylova
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia.
| | | | - Vyacheslav Yu Tabakov
- Common Use Center "Biobank", FSBI 'Research Centre for Medical Genetics', Moscow, Russia
| | - Konstantin G Lyamzaev
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Faculty of Bioengineering and Bioinformatics, Moscow, Russia
| | - Yulia S Itkis
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia
| | - Polina G Tsygankova
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia
| | | | | | | | - Vitaly V Kadyshev
- Department of Epidemiology Genetics, FSBI 'Research Centre for Medical Genetics', Moscow, Russia
| | - Ekaterina Yu Zakharova
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia
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Itkis Y, Krylova T, Pechatnikova NL, De Grassi A, Tabakov VY, Pierri CL, Aleshin V, Boyko A, Bunik VI, Zakharova EY. A novel variant m.641A>T in the mitochondrial MT-TF gene is associated with epileptic encephalopathy in adolescent. Mitochondrion 2019; 47:10-17. [PMID: 31009750 DOI: 10.1016/j.mito.2019.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/21/2019] [Accepted: 04/17/2019] [Indexed: 01/15/2023]
Abstract
We present a 14-year-old girl with loss of motor functions, tetraplegia, epilepsy and nystagmus, caused by a novel heteroplasmic m.641A>T transition in an evolutionary conserved region of mitochondrial genome, affecting the aminoacyl stem of mitochondrial tRNA-Phe. In silico prediction, respirometry, Western blot and enzymatic analyses in skin fibroblasts support the pathogenicity of the m.641A>T substitution. This is the 18th MT-TF point mutation associated with a mitochondrial disorder. The onset and the severity of the disease, however, is unique in this case and broadens the clinical picture related to mutations of mitochondrial tRNA-Phe.
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Affiliation(s)
- Yulia Itkis
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia.
| | - Tatiana Krylova
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia
| | | | - Anna De Grassi
- Department of Biosciences, Biotechnology and Biopharmaceutics, University of Bari, Bari, Italy
| | - Vyacheslav Yu Tabakov
- Common Use Center "Biobank", FSBI 'Research Centre for Medical Genetics", Moscow, Russia
| | - Ciro Leonardo Pierri
- Department of Biosciences, Biotechnology and Biopharmaceutics, University of Bari, Bari, Italy
| | - Vasily Aleshin
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russia; Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Alexandra Boyko
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russia
| | - Victoria I Bunik
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russia; Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Ekaterina Yu Zakharova
- Department of Inborn Errors of Metabolism, FSBI 'Research Centre for Medical Genetics', Moscow, Russia
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