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Florez I, Pirrone I, Casique L, Domínguez CL, Mahfoud A, Rodríguez T, Rodríguez D, De Lucca M, Ramírez JL. Independent origin for m.3243A>G mitochondrial mutation in three Venezuelan cases of MELAS syndrome. Clin Biochem 2022; 109-110:98-101. [PMID: 36130631 DOI: 10.1016/j.clinbiochem.2022.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 09/01/2022] [Accepted: 09/14/2022] [Indexed: 01/04/2023]
Abstract
Mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) is a multisystem and progressive neurodegenerative mitochondrial disease, caused by point nucleotide changes in the mtDNA where 80 % of cases have the mutation m.3243A>G in the MT-TL1 gene. In this work, we described the clinical, biochemical and molecular analysis of three Venezuelan patients affected with MELAS syndrome. All cases showed lactic acidosis, cortical cerebral atrophy on magnetic resonance imaging and muscular system deficit, and in two of the cases alteration of urine organic acid levels was also registered. A screening for the mutation m.3243A>G in different patients' body samples confirmed the presence of this mutation with variable degrees of heteroplasmy (blood = 7-41 %, buccal mucosa = 14-53 %, urine = 58-94 %). The mitochondrial haplogroups for the three patients were different (H, C1b, and A2), indicating an independent origin for the mutation.
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Affiliation(s)
- Ingrid Florez
- Biotechnology Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela
| | - Irune Pirrone
- Biotechnology Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela; Laboratory of Human Metabolism, Department of Cell Biology, Universidad Simón Bolívar, Caracas, Venezuela
| | - Liliana Casique
- Biotechnology Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela; Laboratory of Human Metabolism, Department of Cell Biology, Universidad Simón Bolívar, Caracas, Venezuela.
| | - Carmen Luisa Domínguez
- Inborn Errors of Metabolism Unit, Bioscience Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela
| | - Antonieta Mahfoud
- Inborn Errors of Metabolism Unit, Bioscience Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela
| | - Tania Rodríguez
- Inborn Errors of Metabolism Unit, Bioscience Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela
| | - Daniel Rodríguez
- Inborn Errors of Metabolism Unit, Bioscience Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela
| | - Marisel De Lucca
- Inborn Errors of Metabolism Unit, Bioscience Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela; Department of Biological Sciences, Faculty of Health Sciences, Universidad Técnica de Manabí, Portoviejo, Ecuador.
| | - José Luis Ramírez
- Biotechnology Center, Fundación Instituto de Estudios Avanzados IDEA, Caracas, Venezuela
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Ding Y, Zhang S, Guo Q, Zheng H. Mitochondrial Diabetes is Associated with tRNA Leu(UUR) A3243G and ND6 T14502C Mutations. Diabetes Metab Syndr Obes 2022; 15:1687-1701. [PMID: 35685248 PMCID: PMC9172734 DOI: 10.2147/dmso.s363978] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/26/2022] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Mutations in mitochondrial DNA (mtDNA) are associated with type 2 diabetes mellitus (T2DM). In particular, m.A3243G is the most common T2DM-related mtDNA mutation in many families worldwide. However, the clinical features and pathophysiology of m.A3243G-induced T2DM are largely undefined. METHODS Two pedigrees with maternally inherited T2DM were underwent clinical, molecular and biochemical assessments. The mtDNA genes were PCR amplified and sequenced. Mitochondrial adenosine triphosphate (ATP) and reactive oxygen species (ROS) were measured in polymononuclear leukocytes derived from three patients with both the m.A3243G and m.T14502C mutations, three patients with only the m.A3243G mutation and three controls without these mutations. Moreover, GJB2, GJB3 and GJB6 mutations were screened by PCR-Sanger sequencing. RESULTS Members of the two pedigrees manifestated variable clinical phenotypes including diabetes and hearing and vision impairments. The age at onset of T2DM varied from 31 to 66 years, with an average of 41 years. Mutational analysis of mitochondrial genomes indicated the presence of the m.A3243G mutation in both pedigrees. Matrilineal relatives in one of the pedigrees harbored the coexisting of m.A3243G and m.T14502C mutations. Remarkably, the m.T14502C mutation, which causes the substitution of a conserved isoleucine for valine at position 58 in ND6 mRNA, may affect the mitochondrial respiratory chain functions. Biochemical analysis revealed that cell lines bearing both the m.A3243G and m.T14502C mutations exhibited greater reductions in ATP levels and increased ROS production compared with those carrying only the m.A3243G mutation. However, we did not find any mutations in the GJB2, GJB3 and GJB6 genes. CONCLUSION Our study indicated that mitochondrial diabetes is associated with the tRNALeu(UUR) A3243G and ND6 T14502C mutations.
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Affiliation(s)
- Yu Ding
- Central Laboratory, Hangzhou First People’s Hospital, Hangzhou, 310006, Zhejiang, People’s Republic of China
- Correspondence: Yu Ding, Central Laboratory, Hangzhou First People’s Hospital, Hangzhou, 310006, Zhejiang, People’s Republic of China, Tel/Fax +86-571-56005600, Email
| | - Shunrong Zhang
- Department of Geriatrics, Hangzhou First People’s Hospital, Hangzhou, 310006, Zhejiang, People’s Republic of China
| | - Qinxian Guo
- Central Laboratory, Hangzhou First People’s Hospital, Hangzhou, 310006, Zhejiang, People’s Republic of China
| | - Hui Zheng
- Central Laboratory, Hangzhou First People’s Hospital, Hangzhou, 310006, Zhejiang, People’s Republic of China
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3
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Dawod PGA, Jancic J, Marjanovic A, Brankovic M, Jankovic M, Samardzic J, Gamil Anwar Dawod A, Novakovic I, Abdel Motaleb FI, Radlovic V, Kostic VS, Nikolic D. Mutational Analysis and mtDNA Haplogroup Characterization in Three Serbian Cases of Mitochondrial Encephalomyopathies and Literature Review. Diagnostics (Basel) 2021; 11:1969. [PMID: 34829316 PMCID: PMC8620769 DOI: 10.3390/diagnostics11111969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 10/19/2021] [Accepted: 10/21/2021] [Indexed: 12/15/2022] Open
Abstract
Mitochondrial encephalomyopathies (MEMP) are heterogeneous multisystem disorders frequently associated with mitochondrial DNA (mtDNA) mutations. Clinical presentation varies considerably in age of onset, course, and severity up to death in early childhood. In this study, we performed molecular genetic analysis for mtDNA pathogenic mutation detection in Serbian children, preliminary diagnosed clinically, biochemically and by brain imaging for mitochondrial encephalomyopathies disorders. Sanger sequencing analysis in three Serbian probands revealed two known pathogenic mutations. Two probands had a heteroplasmic point mutation m.3243A>G in the MT-TL1 gene, which confirmed mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episode syndrome (MELAS), while a single case clinically manifested for Leigh syndrome had an almost homoplasmic (close to 100%) m.8993T>G mutation in the MT-ATP6 gene. After full mtDNA MITOMASTER analysis and PhyloTree build 17, we report MELAS' association with haplogroups U and H (U2e and H15 subclades); likewise, the mtDNA-associated Leigh syndrome proband shows a preference for haplogroup H (H34 subclade). Based on clinical-genetic correlation, we suggest that haplogroup H may contribute to the mitochondrial encephalomyopathies' phenotypic variability of the patients in our study. We conclude that genetic studies for the distinctive mitochondrial encephalomyopathies should be well-considered for realizing clinical severity and possible outcomes.
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Affiliation(s)
- Phepy G. A. Dawod
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo 11591, Egypt;
| | - Jasna Jancic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
- Clinic of Neurology and Psychiatry of Children and Youth, 11000 Belgrade, Serbia
| | - Ana Marjanovic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
| | - Marija Brankovic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
| | - Milena Jankovic
- Neurology Clinic, Clinical Center of Serbia, 11000 Belgrade, Serbia;
| | - Janko Samardzic
- Institute of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia;
| | - Ayman Gamil Anwar Dawod
- Internal Medicine, Hepatogastroenterology and Endoscopy Department, Faculty of Medicine, Ain Shams University, Cairo 11591, Egypt;
| | - Ivana Novakovic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
| | - Fayda I. Abdel Motaleb
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo 11591, Egypt;
| | - Vladimir Radlovic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
- Pediatric Surgery Department, University Children’s Hospital, 11000 Belgrade, Serbia
| | - Vladimir S. Kostic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
- Neurology Clinic, Clinical Center of Serbia, 11000 Belgrade, Serbia;
| | - Dejan Nikolic
- Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia; (P.G.A.D.); (J.J.); (A.M.); (M.B.); (I.N.); (V.R.); (V.S.K.)
- Physical Medicine and Rehabilitation Department, University Children’s Hospital, Tirsova 10, 11000 Belgrade, Serbia
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4
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Gutiérrez Cortés N, Pertuiset C, Dumon E, Börlin M, Da Costa B, Le Guédard M, Stojkovic T, Loundon N, Rouillon I, Nadjar Y, Letellier T, Jonard L, Marlin S, Rocher C. Mutation m.3395A > G in MT-ND1 leads to variable pathologic manifestations. Hum Mol Genet 2021; 29:980-989. [PMID: 32011699 DOI: 10.1093/hmg/ddaa020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/27/2020] [Accepted: 01/31/2020] [Indexed: 11/12/2022] Open
Abstract
A non-synonymous mtDNA mutation, m.3395A > G, which changes tyrosine in position 30 to cysteine in p.MT-ND1, was found in several patients with a wide range of clinical phenotypes such as deafness, diabetes and cerebellar syndrome but no Leber's hereditary optic neuropathy. Although this mutation has already been described, its pathogenicity has not been demonstrated. Here, it was found isolated for the first time, allowing a study to investigate its pathogenicity. To do so, we constructed cybrid cell lines and carried out a functional study to assess the possible consequences of the mutation on mitochondrial bioenergetics. Results obtained demonstrated that this mutation causes an important dysfunction of the mitochondrial respiratory chain with a decrease in both activity and quantity of complex I due to a diminution of p.MT-ND1 quantity. However, no subcomplexes were found in cybrids carrying the mutation, indicating that the quality of the complex I assembly is not affected. Moreover, based on the crystal structure of p.MT-ND1 and the data found in the literature, we propose a hypothesis for the mechanism of the degradation of p.MT-ND1. Our study provides new insights into the pathophysiology of mitochondrial diseases and in particular of MT-ND1 mutations.
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Affiliation(s)
- Nicolás Gutiérrez Cortés
- INSERM-U688 Physiopathologie Mitochondriale, Université Bordeaux Segalen, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Claire Pertuiset
- INSERM-U688 Physiopathologie Mitochondriale, Université Bordeaux Segalen, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Elodie Dumon
- INSERM-U688 Physiopathologie Mitochondriale, Université Bordeaux Segalen, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Marine Börlin
- INSERM-U688 Physiopathologie Mitochondriale, Université Bordeaux Segalen, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Barbara Da Costa
- INSERM-U688 Physiopathologie Mitochondriale, Université Bordeaux Segalen, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Marina Le Guédard
- Laboratoire de Biogenèse Membranaire, CNRS UMR 5200, Université de Bordeaux, INRA Bordeaux Aquitaine, Villenave d'Ornon, France.,LEB Aquitaine Transfert-ADERA, FR-33883 Villenave d'Ornon, Cedex, France
| | - Tanya Stojkovic
- APHP, Centre de Référence des Maladies Neuromusculaires Ile de France Nord Est, G-H Pitié-Salpêtrière, 75013 Paris, France
| | - Natalie Loundon
- Otorhinolaryngologie Pédiatrique, Centre de Référence des Surdités Génétiques, Hôpital Necker, AP-HP, Paris, France
| | - Isabelle Rouillon
- Otorhinolaryngologie Pédiatrique, Centre de Référence des Surdités Génétiques, Hôpital Necker, AP-HP, Paris, France
| | - Yann Nadjar
- Neurologie, GH Pitié Salpêtrière, 75013 Paris, France
| | - Thierry Letellier
- Equipe de Médecine Evolutive, AMIS, UMR 5288 CNRS/Université Paul Sabatier, 31073 Toulouse, France
| | - Laurence Jonard
- Service de Génétique Moléculaire, Hôpital Necker-Enfants Malades, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France
| | - Sandrine Marlin
- Service de Génétique Moléculaire, Hôpital Necker-Enfants Malades, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France.,Centre de Référence des Surdités Génétiques, Service de Génétique Médicale, Hôpital Necker-Enfants Malades, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France.,UMR 1163, Université Paris Descartes, Sorbonne Paris Cité, Institut IMAGINE, 24 Boulevard du Montparnasse, 75015 Paris, France
| | - Christophe Rocher
- INSERM-U688 Physiopathologie Mitochondriale, Université Bordeaux Segalen, 146 rue Léo Saignat, 33076 Bordeaux, France
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5
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Destiarani W, Mulyani R, Yusuf M, Maksum IP. Molecular Dynamics Simulation of T10609C and C10676G Mutations of Mitochondrial ND4L Gene Associated With Proton Translocation in Type 2 Diabetes Mellitus and Cataract Patients. Bioinform Biol Insights 2020; 14:1177932220978672. [PMID: 33402819 PMCID: PMC7747115 DOI: 10.1177/1177932220978672] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 11/14/2020] [Indexed: 11/17/2022] Open
Abstract
The mutation rate of mitochondrial DNA (mtDNA) is 17 times higher than nuclear DNA, and these mutations can cause mitochondrial disease in 1 of 10.000 people. The T10609C mutation was identified in type 2 diabetes mellitus (T2DM) patients and the C10676G mutation in cataract patients, with both mutations occurring in the ND4L gene of mtDNA that encodes ND4L protein. ND4L protein, a subunit of complex I in the respiratory complex, has been shown to play a role in the proton translocation process. The purpose of this study was to investigate the effect of both mutations on the proton translocation mechanism. Mutation mapping showed changes in amino acids M47T (T10609C) and C69W (C10676G). The 100 ns molecular dynamics (MD) simulations performed on native and mutants of ND4L-ND6 subunits. It is revealed that the native model had a similar proton translocation pathway to that of complex I from other organisms. Interestingly, the mutant M47T and C69W showed the interruption of the translocation pathway by a hydrogen bond formation between Glu34 and Tyr157. It is observed that the mutations were restricting the passage of water molecules through the transmembrane region. These results could help to develop the computational assay for the validation of a specific genetic biomarker for T2DM and cataracts.
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Affiliation(s)
- Wanda Destiarani
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, Indonesia
| | - Rahmaniar Mulyani
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, Indonesia
| | - Muhammad Yusuf
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, Indonesia
- Research Center for Molecular Biotechnology and Bioinformatics, Universitas Padjadjaran, Bandung, Indonesia
| | - Iman Permana Maksum
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, Indonesia
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Bayona-Bafaluy MP, Iglesias E, López-Gallardo E, Emperador S, Pacheu-Grau D, Labarta L, Montoya J, Ruiz-Pesini E. Genetic aspects of the oxidative phosphorylation dysfunction in dilated cardiomyopathy. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2020; 786:108334. [PMID: 33339579 DOI: 10.1016/j.mrrev.2020.108334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 08/19/2020] [Accepted: 08/20/2020] [Indexed: 12/27/2022]
Abstract
Dilated cardiomyopathy is a frequent and extremely heterogeneous medical condition. Deficits in the oxidative phosphorylation system have been described in patients suffering from dilated cardiomyopathy. Hence, mutations in proteins related to this biochemical pathway could be etiological factors for some of these patients. Here, we review the clinical phenotypes of patients harboring pathological mutations in genes related to the oxidative phosphorylation system, either encoded in the mitochondrial or in the nuclear genome, presenting with dilated cardiomyopathy. In addition to the clinical heterogeneity of these patients, the large genetic heterogeneity has contributed to an improper allocation of pathogenicity for many candidate mutations. We suggest criteria to avoid incorrect assignment of pathogenicity to newly found mutations and discuss possible therapies targeting the oxidative phosphorylation function.
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Affiliation(s)
- M Pilar Bayona-Bafaluy
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - Eldris Iglesias
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain.
| | - Ester López-Gallardo
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - Sonia Emperador
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - David Pacheu-Grau
- Department of Cellular Biochemistry, University Medical Center, Georg-August University,Humboldtalle, 23., 37073, Göttingen, Germany.
| | - Lorenzo Labarta
- Unidad de Cuidados Intensivos, Hospital San Jorge, Av. Martínez de Velasco, 36., 22004, Huesca, Spain.
| | - Julio Montoya
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain.
| | - Eduardo Ruiz-Pesini
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013, Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, Av. San Juan Bosco, 13., 50009, Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), Av. Monforte de Lemos, 3-5, 28029, Madrid, Spain; Fundación ARAID, Av. de Ranillas, 1-D., 50018, Zaragoza, Spain.
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7
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Liu G, Shen X, Sun Y, Lv Q, Li Y, Du A. Heteroplasmy and phenotype spectrum of the mitochondrial tRNA Leu (UUR) gene m.3243A>G mutation in seven Han Chinese families. J Neurol Sci 2020; 408:116562. [PMID: 31722256 DOI: 10.1016/j.jns.2019.116562] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 11/03/2019] [Accepted: 11/04/2019] [Indexed: 01/06/2023]
Abstract
The m.3243A > G mutation in the mitochondrial tRNALeu (UUR) gene is associated with a variety of phenotypic heterogeneity. The clinical spectrum and phenotypic-genotypic correlations in the Chinese patients are poorly understood. In the present study, we reported the clinical and genetic characterization, as well as haplogroups of seven Han Chinese families carrying the m.3243A > G mutation. Of the 39 matrilineal individuals, five suffered from mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS), two had life-threatening mitochondrial myopathy (LTMM), and one patient had neuropathy, ataxia, and retinitis pigmentosa (NARP)-like syndrome. The LTMM and NARP like syndromes enriched the phenotypic profile of the m.3243A > G mutation. The heteroplasmy of the m.3243A > G mutation ranged from 16% to 59% in MELAS, 29% to 79% in LTMM, and 57% in a NARP-like syndrome patient. The levels ranged from 0% to 14% in patients that manifested with pure diabetes and pure hearing loss, and 0% to 5% in 13 normal family members. However, we particularly noticed heteroplasmy in four asymptomatic individuals in one LTMM family carried the heteroplasmy mutation ranged from 22% to 78%, implying that there were other modifying factors in this family. The modulation of the phenotype of mtDNA mutations requires further investigation.
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Affiliation(s)
- Gailing Liu
- Department of Neurology, Tongren Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200336, China
| | - Xiya Shen
- Department of Neurology, Tongren Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200336, China
| | - Yongan Sun
- Department of Neurology, Perking University First Hospital, Beijing 100034, China
| | - Qing Lv
- Department of Neurology, Tongren Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200336, China
| | - Yuanyuan Li
- Department of Neurology, Tongren Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200336, China
| | - Ailian Du
- Department of Neurology, Tongren Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200336, China; Department of Neurology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310009, China.
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8
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Chinnery PF, Gomez-Duran A. Oldies but Goldies mtDNA Population Variants and Neurodegenerative Diseases. Front Neurosci 2018; 12:682. [PMID: 30369864 PMCID: PMC6194173 DOI: 10.3389/fnins.2018.00682] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 09/10/2018] [Indexed: 12/31/2022] Open
Abstract
mtDNA is transmitted through the maternal line and its sequence variability, which is population specific, is assumed to be phenotypically neutral. However, several studies have shown associations between the variants defining some genetic backgrounds and the susceptibility to several pathogenic phenotypes, including neurodegenerative diseases. Many of these studies have found that some of these variants impact many of these phenotypes, including the ones defining the Caucasian haplogroups H, J, and Uk, while others, such as the ones defining the T haplogroup, have phenotype specific associations. In this review, we will focus on those that have shown a pleiotropic effect in population studies in neurological diseases. We will also explore their bioenergetic and genomic characteristics in order to provide an insight into the role of these variants in disease. Given the importance of mitochondrial population variants in neurodegenerative diseases a deeper analysis of their effects might unravel new mechanisms of disease and help design new strategies for successful treatments.
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Affiliation(s)
- Patrick F Chinnery
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom.,Medical Research Council-Mitochondrial Biology Unit, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | - Aurora Gomez-Duran
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom.,Medical Research Council-Mitochondrial Biology Unit, Cambridge Biomedical Campus, Cambridge, United Kingdom
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9
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Kenney MC, Chwa M, Atilano SR, Falatoonzadeh P, Ramirez C, Malik D, Tarek M, Cáceres-del-Carpio J, Nesburn AB, Boyer DS, Kuppermann BD, Vawter M, Jazwinski SM, Miceli M, Wallace DC, Udar N. Inherited mitochondrial DNA variants can affect complement, inflammation and apoptosis pathways: insights into mitochondrial-nuclear interactions. Hum Mol Genet 2014; 23:3537-51. [PMID: 24584571 PMCID: PMC4049308 DOI: 10.1093/hmg/ddu065] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 02/03/2014] [Accepted: 02/10/2014] [Indexed: 12/21/2022] Open
Abstract
Age-related macular degeneration (AMD) is the leading cause of vision loss in developed countries. While linked to genetic polymorphisms in the complement pathway, there are many individuals with high risk alleles that do not develop AMD, suggesting that other 'modifiers' may be involved. Mitochondrial (mt) haplogroups, defined by accumulations of specific mtDNA single nucleotide polymorphisms (SNPs) which represent population origins, may be one such modifier. J haplogroup has been associated with high risk for AMD while the H haplogroup is protective. It has been difficult to assign biological consequences for haplogroups so we created human ARPE-19 cybrids (cytoplasmic hybrids), which have identical nuclei but mitochondria of either J or H haplogroups, to investigate their effects upon bioenergetics and molecular pathways. J cybrids have altered bioenergetic profiles compared with H cybrids. Q-PCR analyses show significantly lower expression levels for seven respiratory complex genes encoded by mtDNA. J and H cybrids have significantly altered expression of eight nuclear genes of the alternative complement, inflammation and apoptosis pathways. Sequencing of the entire mtDNA was carried out for all the cybrids to identify haplogroup and non-haplogroup defining SNPs. mtDNA can mediate cellular bioenergetics and expression levels of nuclear genes related to complement, inflammation and apoptosis. Sequencing data suggest that observed effects are not due to rare mtDNA variants but rather the combination of SNPs representing the J versus H haplogroups. These findings represent a paradigm shift in our concepts of mt-nuclear interactions.
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Affiliation(s)
- M Cristina Kenney
- Gavin Herbert Eye Institute, Department of Pathology and Laboratory Medicine,
| | | | | | | | | | | | | | | | - Anthony B Nesburn
- Gavin Herbert Eye Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - David S Boyer
- Retina-Vitreous Associates Medical Group, Beverly Hills, CA, USA
| | | | - Marquis Vawter
- Functional Genomics Laboratory, Department of Psychiatry and Human Behavior, University of California Irvine, Irvine, CA, USA
| | | | - Michael Miceli
- Tulane Center for Aging, Tulane University, New Orleans, LA, USA
| | - Douglas C Wallace
- Children's Hospital of Philadelphia, Center for Mitochondrial and Epigenomic Medicine, Philadelphia, PA, USA
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10
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Affiliation(s)
- J. William O. Ballard
- School of Biotechnology and Biomolecular Sciences; University of New South Wales; Sydney New South Wales 2052 Australia
| | - Nicolas Pichaud
- School of Biotechnology and Biomolecular Sciences; University of New South Wales; Sydney New South Wales 2052 Australia
- Laboratoire de Biologie Intégrative; Département de Biologie, Chimie et Géographie; Université du Québec à Rimouski; Rimouski Quebec Canada
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11
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Pierron D, Wildman DE, Hüttemann M, Letellier T, Grossman LI. Evolution of the couple cytochrome c and cytochrome c oxidase in primates. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 748:185-213. [PMID: 22729859 DOI: 10.1007/978-1-4614-3573-0_8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mitochondrial energy metabolism has been affected by a broad set of ancient and recent evolutionary events. The oldest example is the endosymbiosis theory that led to mitochondria and a recently proposed example is adaptation to cold climate by anatomically modern human lineages. Mitochondrial energy metabolism has also been associated with an important area in anthropology and evolutionary biology, brain enlargement in human evolution. Indeed, several studies have pointed to the need for a major metabolic rearrangement to supply a sufficient amount of energy for brain development in primates.The genes encoding for the coupled cytochrome c (Cyt c) and cytochrome c oxidase (COX, complex IV, EC 1.9.3.1) seem to have an exceptional pattern of evolution in the anthropoid lineage. It has been proposed that this evolution was linked to the rearrangement of energy metabolism needed for brain enlargement. This hypothesis is reinforced by the fact that the COX enzyme was proposed to have a large role in control of the respiratory chain and thereby global energy production.After summarizing major events that occurred during the evolution of COX and cytochrome c on the primate lineage, we review the different evolutionary forces that could have influenced primate COX evolution and discuss the probable causes and consequences of this evolution. Finally, we discuss and review the co-occurring primate phenotypic evolution.
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Affiliation(s)
- Denis Pierron
- Wayne State University School of Medicine, Detroit, MI 48201, USA
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12
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Pierron D, Letellier T, Grossman LI. Mitogroup: continent-specific clusters of mitochondrial OXPHOS complexes based on nuclear non-synonymous polymorphisms. Mitochondrion 2011; 12:237-41. [PMID: 21968253 DOI: 10.1016/j.mito.2011.09.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 09/05/2011] [Accepted: 09/16/2011] [Indexed: 11/20/2022]
Abstract
OXPHOS polymorphisms are known to be population specific and to influence disease. Previous studies have focused on mtDNA polymorphisms. Based on a world sampling of 629 unrelated individuals, we have now studied the polymorphisms of the 80 genes encoding OXPHOS nuclear subunits. We have shown that (i) amino-acid replacement frequencies are significantly correlated with their pathogenicity probability, and (ii) populations can be distinguished based only on amino-acid replacements in nuclear encoded OXPHOS subunits. These results are congruent with the major mtDNA haplogroups, which suggests that OXPHOS complexes are different across the populations in both nuclear and in mitochondrial encoded subunits.
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Affiliation(s)
- Denis Pierron
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI 48201, USA
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13
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Sans M, Figueiro G, Ackermann E, Barreto I, Egaña A, Bertoni B, Poittevin-Gilmet E, Maytia D, Hidalgo PC. Mitochondrial DNA in Basque descendants from the city of Trinidad, Uruguay: Uruguayan- or Basque-like population? Hum Biol 2011; 83:55-70. [PMID: 21453004 DOI: 10.3378/027.083.0104] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Like other countries in the Americas, during its colonization Uruguay was the recipient of immigrants from several ethnic groups from Europe, as well as of enslaved Africans. After its independence in 1830, Basques were the first group of Europeans to arrive in the country. In this paper, we aim to contribute to the understanding of the process of integration of these migratory waves into the Uruguayan society. For that purpose, individuals of Basque origin from the city of Trinidad, Uruguay, were chosen to participate in this study. Particularly, we wanted to determine if Basque descendants in Uruguay remained relatively isolated or if they mixed with other ethnic groups. Mitochondrial DNA (mtDNA) of 60 self-identified Basque descendants, taken from a larger sample of subjects with Basque ancestors, was analyzed. The origin of mtDNA haplogroups was 77.8% European, 20.4% Amerindian, and 1.8% African, showing similar frequencies to other Uruguayan regions. Very few sequences showed a clear Basque origin, although other sources such as the Canary Islands are likely. Moreover, genetic distances clearly show that Basque descendants are genetically closer to other Uruguayan groups than to European populations, including Basques. It is possible to conclude that Basques and their descendants in the region of Trinidad did not remain isolated and that their marriage behavior was similar to that of other Uruguayan populations. However, to have a more accurate picture of the way Basques intermarried with other populations in Uruguay, new analyses are needed that take into account paternal lineages as well as biparental genetic markers.
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Affiliation(s)
- M Sans
- Department of Biological Anthropology, Facultad de Humanidades y Ciencias de la Educación, Universidad de la República, 11200 Montevideo, Uruguay
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14
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Pierron D, Chang I, Arachiche A, Heiske M, Thomas O, Borlin M, Pennarun E, Murail P, Thoraval D, Rocher C, Letellier T. Mutation rate switch inside Eurasian mitochondrial haplogroups: impact of selection and consequences for dating settlement in Europe. PLoS One 2011; 6:e21543. [PMID: 21738700 PMCID: PMC3125290 DOI: 10.1371/journal.pone.0021543] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Accepted: 06/03/2011] [Indexed: 01/27/2023] Open
Abstract
R-lineage mitochondrial DNA represents over 90% of the European population and is significantly present all around the planet (North Africa, Asia, Oceania, and America). This lineage played a major role in migration “out of Africa” and colonization in Europe. In order to determine an accurate dating of the R lineage and its sublineages, we analyzed 1173 individuals and complete mtDNA sequences from Mitomap. This analysis revealed a new coalescence age for R at 54.500 years, as well as several limitations of standard dating methods, likely to lead to false interpretations. These findings highlight the association of a striking under-accumulation of synonymous mutations, an over-accumulation of non-synonymous mutations, and the phenotypic effect on haplogroup J. Consequently, haplogroup J is apparently not a Neolithic group but an older haplogroup (Paleolithic) that was subjected to an underestimated selective force. These findings also indicated an under-accumulation of synonymous and non-synonymous mutations localized on coding and non-coding (HVS1) sequences for haplogroup R0, which contains the major haplogroups H and V. These new dates are likely to impact the present colonization model for Europe and confirm the late glacial resettlement scenario.
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Affiliation(s)
- Denis Pierron
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Ivan Chang
- Institute of Genomic Biology, University of California Irvine, Irvine, California, United States of America
| | - Amal Arachiche
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Margit Heiske
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Olivier Thomas
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Marine Borlin
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Erwan Pennarun
- Department of Evolutionary Biology, Institute of Molecular and Cell Biology, University of Tartu and Estonian Biocentre, Tartu, Estonia
| | - Pacal Murail
- Laboratoire d'Anthropologie des Populations du Passé PACEA UMR 5199, CNRS - Université Bordeaux 1, Talence, France
| | - Didier Thoraval
- Institut de Biochimie et Génétique Cellulaires UMR 5095, CNRS - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Christophe Rocher
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
| | - Thierry Letellier
- Laboratoire de Physiopathologie Mitochondriale U688, INSERM - Université Victor Segalen-Bordeaux 2, Bordeaux, France
- * E-mail:
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15
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Mazat JP, Ransac S. [The cytochrome bc1 complex in the mitochondrial respiratory chain functions according to the Q cycle hypothesis of Mitchell: the proof using a stochastic approach?]. Med Sci (Paris) 2011; 26:1079-86. [PMID: 21187048 DOI: 10.1051/medsci/201026121079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The bc1 complex is a central complex in the mitochondrial respiratory chain. It links the electrons transfer from ubiquinol (or coenzyme Q) to cytochrome c and proton translocation across the inner mitochondrial membrane. It is widely agreed that the "Q-cycle mechanism" proposed by Mitchell correctly describes the bc1 complex working. It is based on an unexpected separation of the two electrons coming from the coenzyme Q bound at the Q0 site of the bc1 complex. Using the stochastic approach of Gillespie and the known spatial structure of bc1 complexes with the kinetic parameters described by Moser and Dutton we demonstrated the natural emergence of the Q-cycle mechanism and the quasi absence of short-circuits in the functional dimer of bc1 complex without the necessity to invoke any additional mechanism. This approach gives a framework which is well adapted to the modelling of all oxido-reduction reactions of the respiratory chain complexes, normal or mutant.
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Affiliation(s)
- Jean-Pierre Mazat
- Inserm U688, Université de Bordeaux 2, 146, rue Léo-Saignat, F 33076, Bordeaux Cedex, France.
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16
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Ienco EC, Simoncini C, Orsucci D, Petrucci L, Filosto M, Mancuso M, Siciliano G. May "mitochondrial eve" and mitochondrial haplogroups play a role in neurodegeneration and Alzheimer's disease? Int J Alzheimers Dis 2011; 2011:709061. [PMID: 21423558 PMCID: PMC3056451 DOI: 10.4061/2011/709061] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Accepted: 12/29/2010] [Indexed: 12/26/2022] Open
Abstract
Mitochondria, the powerhouse of the cell, play a critical role in several metabolic processes and apoptotic pathways. Multiple evidences suggest that mitochondria may be crucial in ageing-related neurodegenerative diseases. Moreover, mitochondrial haplogroups have been linked to multiple area of medicine, from normal ageing to diseases, including neurodegeneration. Polymorphisms within the mitochondrial genome might lead to impaired energy generation and to increased amount of reactive oxygen species, having either susceptibility or protective role in several diseases. Here, we highlight the role of the mitochondrial haplogroups in the pathogenetic cascade leading to diseases, with special attention to Alzheimer's disease.
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Affiliation(s)
- Elena Caldarazzo Ienco
- Department of Neuroscience, Neurological Clinic, University of Pisa, Via Roma 67, 56126 Pisa, Italy
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17
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Wolf C, Gramer E, Müller-Myhsok B, Pasutto F, Wissinger B, Weisschuh N. Mitochondrial haplogroup U is associated with a reduced risk to develop exfoliation glaucoma in the German population. BMC Genet 2010; 11:8. [PMID: 20109175 PMCID: PMC2834599 DOI: 10.1186/1471-2156-11-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2009] [Accepted: 01/28/2010] [Indexed: 11/16/2022] Open
Abstract
Background Various lines of evidence demonstrate the involvement of mitochondrial dysfunction in the pathogenesis of glaucoma. Therefore, mitochondrial DNA is a promising candidate for genetic susceptibility studies on glaucoma. To test the hypothesis that mitochondrial haplogroups influence the risk to develop glaucoma, we genotyped 12 single-nucleotide polymorphisms that define the European mitochondrial DNA haplogroups in healthy controls and two German patient cohorts with either exfoliation glaucoma or the normal tension subgroup of primary open angle glaucoma. Results Mitochondrial haplogroup U was significantly under-represented in patients with exfoliation glaucoma (8.3% compared with 18.9% in controls; p = 0.004). Conclusions People with haplogroup U have a lower risk to develop exfoliation glaucoma. Our results substantiate the suggestion that mitochondrial alterations have an impact on the etiology of glaucoma.
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Affiliation(s)
- Christiane Wolf
- Centre for Ophthalmology, Institute for Ophthalmic Research, Tuebingen, Germany
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18
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[Strategy in diagnosis of mitochondrial diseases]. ACTA ACUST UNITED AC 2009; 58:353-6. [PMID: 19942370 DOI: 10.1016/j.patbio.2009.09.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 09/14/2009] [Indexed: 12/12/2022]
Abstract
Mitochondrial diseases (MD) are the most frequent metabolic disorders. They have in common a respiratory chain deficiency. Clinical presentation of MD is very heterogeneous and the major physiological functions may be affected. Diagnosis is complex due to the potential involvement of two genomes (nuclear or mitochondrial DNA), the large number of candidate genes to screen and the small number of patients reported for each type of MD. Clinical presentation, trait of inheritance, cerebral imaging (MRI and CT-Scan) and specialized biochemical investigations are good indicators, but identification of causing mutation(s) is the clue to confirm diagnosis. Task is huge and progress in diagnosis of MD should come from genotype-phenotype correlations studies and from major technical improvements in molecular diagnosis. Exhaustive study of mitochondrial DNA is the first necessary step that is now possible with methods like Surveyor and Affymetrix resequencing chip. Combination of data including clinical informations, cerebral imaging, respiratory chain deficiency and/or assembly profile of respiratory chain complexes (BN-PAGE profile) may contribute for orientation for nuclear DNA studies. Elucidation of the genetic bases of MD is important for patients: identification of causing mutation(s) allows offering genetic counselling and possibility of prenatal diagnosis.
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Martínez-Redondo D, Marcuello A, Casajús JA, Ara I, Dahmani Y, Montoya J, Ruiz-Pesini E, López-Pérez MJ, Díez-Sánchez C. Human mitochondrial haplogroup H: the highest VO2max consumer--is it a paradox? Mitochondrion 2009; 10:102-7. [PMID: 19900587 DOI: 10.1016/j.mito.2009.11.005] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 10/26/2009] [Accepted: 11/03/2009] [Indexed: 10/20/2022]
Abstract
Mitochondrial background has been demonstrated to influence maximal oxygen uptake (VO(2max), in mLkg(-1)min(-1)), but this genetic influence can be compensated for by regular exercise. A positive correlation among electron transport chain (ETC) coupling, ATP and reactive oxygen species (ROS) production has been established, and mitochondrial variants have been reported to show differences in their ETC performance. In this study, we examined in detail the VO(2max) differences found among mitochondrial haplogroups. We recruited 81 healthy male Spanish Caucasian individuals and determined their mitochondrial haplogroup. Their VO(2max) was determined using incremental cycling exercise (ICE). VO(2max) was lower in J than in non-J haplogroup individuals (P=0.04). The H haplogroup was responsible for this difference (VO(2max); J vs. H; P=0.008) and this group also had significantly higher mitochondrial oxidative damage (mtOD) than the J haplogroup (P=0.04). In agreement with these results, VO(2max) and mtOD were positively correlated (P=0.01). Given that ROS production is the major contributor to mtOD and consumes four times more oxygen per electron than the ETC, our results strongly suggest that ROS production is responsible for the higher VO(2max) found in the H variant. These findings not only contribute to a better understanding of the mechanisms underneath VO(2max), but also help to explain some reported associations between mitochondrial haplogroups and mtOD with longevity, sperm motility, premature aging and susceptibility to different pathologies.
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Affiliation(s)
- Diana Martínez-Redondo
- Departamento de Bioquímica y Biología Molecular y Celular, Universidad de Zaragoza y CIBER de Enfermedades Raras (CIBERER), Universidad de Zaragoza, Spain
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20
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Di Bernardo G, Del Gaudio S, Galderisi U, Cascino A, Cipollaro M. Ancient DNA and family relationships in a Pompeian house. Ann Hum Genet 2009; 73:429-37. [PMID: 19523150 DOI: 10.1111/j.1469-1809.2009.00520.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Archaeological, anthropological and pathological data suggest that thirteen skeletons found in a house at the Pompeii archaeological site, dated to 79 A.D., belong to one family. To verify this and to identify the relationships between these individuals, we analyzed DNA extracted from bone specimens. Specifically, hypervariable segment 1 (HVS1) of the human mitochondrial DNA (mtDNA) control region was amplified in two overlapping polymerase chain reactions and the sequences were compared to the revised Cambridge Reference Sequence. As independent controls, other polymorphic sites in HVS1, HVS2 and in the coding region were analyzed. We also amplified some short tandem repeats of the thirteen specimens. This study revealed that six of the thirteen individuals are indeed closely related.
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Affiliation(s)
- Giovanni Di Bernardo
- Department of Experimental Medicine, Biotechnology and Molecular Biology Section Antonino Cascino, 2nd University of Naples, Via Costantinopoli 16, Naples, Italy
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21
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Pierron D, Ferré M, Rocher C, Chevrollier A, Murail P, Thoraval D, Amati-Bonneau P, Reynier P, Letellier T. OPA1-related dominant optic atrophy is not strongly influenced by mitochondrial DNA background. BMC MEDICAL GENETICS 2009; 10:70. [PMID: 19619285 PMCID: PMC2726129 DOI: 10.1186/1471-2350-10-70] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Accepted: 07/20/2009] [Indexed: 11/10/2022]
Abstract
BACKGROUND Leber's hereditary optic neuropathy (LHON) and autosomal dominant optic atrophy (ADOA) are the most frequent forms of hereditary optic neuropathies. LHON is associated with mitochondrial DNA (mtDNA) mutations whereas ADOA is mainly due to mutations in the OPA1 gene that encodes a mitochondrial protein involved in the mitochondrial inner membrane remodeling. A striking influence of mtDNA haplogroup J on LHON expression has been demonstrated and it has been recently suggested that this haplogroup could also influence ADOA expression. In this study, we have tested the influence of mtDNA backgrounds on OPA1 mutations. METHODS To define the relationships between OPA1 mutations and mtDNA backgrounds, we determined the haplogroup affiliation of 41 French patients affected by OPA1-related ADOA by control-region sequencing and RFLP survey of their mtDNAs. RESULTS The comparison between patient and reference populations did not revealed any significant difference. CONCLUSION Our results argue against a strong influence of mtDNA background on ADOA expression. These data allow to conclude that OPA1 could be considered as a "severe mutation", directly responsible of the optic atrophy, whereas OPA1-negative ADOA and LHON mutations need an external factor(s) to express the pathology (i.e. synergistic interaction with mitochondrial background).
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Affiliation(s)
- Denis Pierron
- Université Bordeaux 1, Laboratoire d'Anthropologie des Populations du Passé, UMR 5199 PACEA, 33400 Talence, France.
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