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Roy T, Padhi S, Mazumder R, Majee C, Das S, Monika M, Mishra R, Kapoor B. Alleviating Neurodegenerative Diseases Associated with Mitochondrial Defects by Therapeutic Biomolecules. Curr Top Med Chem 2024; 24:CTMC-EPUB-139631. [PMID: 38591201 DOI: 10.2174/0115680266299148240329062647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/17/2023] [Revised: 03/02/2024] [Accepted: 03/08/2024] [Indexed: 04/10/2024]
Abstract
Neurodegenerative diseases are emerging as a global health concern in the current sce-nario, and their association with mitochondrial defects has been a potential area of research. Mi-tochondria, one of the essential organelles of the cell, serve as the cell's powerhouse, producing energy and ensuring cellular health. Neurodegenerative diseases such as Alzheimer's, Parkinson's, Huntington's, amyotrophic lateral sclerosis, and Pelizaeus-Merzbacher disease have been found to be primarily triggered by mitochondrial malfunction. One of the key byproducts of mitochondrial respiration, reactive oxygen species, also contributes significantly to mitochondrial DNA muta-tions that eventually cause mitochondrial breakdown. This review paper comprehensively examines the potential of therapeutic biomolecules, specifi-cally mitochondria-specific antioxidants, in mitigating the impact of mitochondrial defects on neurodegenerative diseases. It provides a detailed analysis of the mechanisms involved in mito-chondrial dysfunction, the potential therapeutic targets of these biomolecules, and their structure-activity relationship information are also discussed in this review. Various research articles and publications were used extensively in compiling the data, and the structures of biomolecules were prepared using software such as ChemDraw and ChemSketch. Crucial elements triggering mitochondrial abnormalities were identified and a tabular compilation of bioactive antioxidant compounds along with their therapeutic targets, was presented. Mitochondria-specific antioxidant therapy is an innovative and promising strategy for the man-agement of neurodegenerative diseases associated with mitochondrial defects. This review pro-vides a thorough summary of the current state of research and promising avenues of research and development in this field, emphasizing the importance of further investigations and clinical trials to elucidate their therapeutic benefits.
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Affiliation(s)
- Tanmoy Roy
- Department of Pharmaceutics, Noida Institute of Engineering and Technology, Pharmacy Institute, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Swarupanjali Padhi
- Department of Pharmaceutics, Noida Institute of Engineering and Technology, Pharmacy Institute, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Rupa Mazumder
- Department of Pharmaceutics, Noida Institute of Engineering and Technology, Pharmacy Institute, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Chandana Majee
- Department of Pharmaceutics, Noida Institute of Engineering and Technology, Pharmacy Institute, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Saumya Das
- Department of Pharmaceutics, Noida Institute of Engineering and Technology, Pharmacy Institute, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Monika Monika
- Department of Pharmaceutics, Noida Institute of Engineering and Technology, Pharmacy Institute, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Rashmi Mishra
- Department of Biotechnology, Noida Institute of Engineering and Technology, Greater Noida, Gautam Buddha Nagar, Uttar Pradesh, 201306, India
| | - Bhupinder Kapoor
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
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Wu YT, Tay HY, Yang JT, Liao HH, Ma YS, Wei YH. Mitochondrial impairment and synaptic dysfunction are associated with neurological defects in iPSCs-derived cortical neurons of MERRF patients. J Biomed Sci 2023; 30:70. [PMID: 37605213 PMCID: PMC10441704 DOI: 10.1186/s12929-023-00966-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/08/2023] [Indexed: 08/23/2023] Open
Abstract
BACKGROUND Myoclonic epilepsy with ragged-red fibers (MERRF) syndrome is a rare inherited mitochondrial disease mainly caused by the m.8344A > G mutation in mitochondrial tRNALys gene, and usually manifested as complex neurological disorders and muscle weakness. Currently, the pathogenic mechanism of this disease has not yet been resolved, and there is no effective therapy for MERRF syndrome. In this study, MERRF patients-derived iPSCs were used to model patient-specific neurons for investigation of the pathogenic mechanism of neurological disorders in mitochondrial disease. METHODS MERRF patient-derived iPSCs were differentiated into excitatory glutamatergic neurons to unravel the effects of the m.8344A > G mutation on mitochondrial bioenergetic function, neural-lineage differentiation and neuronal function. By the well-established differentiation protocol and electrophysiological activity assay platform, we examined the pathophysiological behaviors in cortical neurons of MERRF patients. RESULTS We have successfully established the iPSCs-derived neural progenitor cells and cortical-like neurons of patients with MERRF syndrome that retained the heteroplasmy of the m.8344A > G mutation from the patients' skin fibroblasts and exhibited the phenotype of the mitochondrial disease. MERRF neural cells harboring the m.8344A > G mutation exhibited impaired mitochondrial bioenergetic function, elevated ROS levels and imbalanced expression of antioxidant enzymes. Our findings indicate that neural immaturity and synaptic protein loss led to the impairment of neuronal activity and plasticity in MERRF neurons harboring the m.8344A > G mutation. By electrophysiological recordings, we monitored the in vivo neuronal behaviors of MERRF neurons and found that neurons harboring a high level of the m.8344A > G mutation exhibited impairment of the spontaneous and evoked potential-stimulated neuronal activities. CONCLUSIONS We demonstrated for the first time the link of mitochondrial impairment and synaptic dysfunction to neurological defects through impeding synaptic plasticity in excitatory neurons derived from iPSCs of MERRF patients harboring the m.8344A > G mutation. This study has provided new insight into the pathogenic mechanism of the tRNALys gene mutation of mtDNA, which is useful for the development of a patient-specific iPSCs platform for disease modeling and screening of new drugs to treat patients with MERRF syndrome.
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Affiliation(s)
- Yu-Ting Wu
- Center for Mitochondrial Medicine and Free Radical Research, Changhua Christian Hospital, Changhua City, Taiwan, 50046
| | - Hui-Yi Tay
- Center for Mitochondrial Medicine and Free Radical Research, Changhua Christian Hospital, Changhua City, Taiwan, 50046
| | - Jung-Tse Yang
- Center for Mitochondrial Medicine and Free Radical Research, Changhua Christian Hospital, Changhua City, Taiwan, 50046
| | - Hsiao-Hui Liao
- Center for Mitochondrial Medicine and Free Radical Research, Changhua Christian Hospital, Changhua City, Taiwan, 50046
| | - Yi-Shing Ma
- Center for Mitochondrial Medicine and Free Radical Research, Changhua Christian Hospital, Changhua City, Taiwan, 50046
| | - Yau-Huei Wei
- Center for Mitochondrial Medicine and Free Radical Research, Changhua Christian Hospital, Changhua City, Taiwan, 50046.
- Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, 112.
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Liu M, Ji W, Zhao X, Liu X, Hu JF, Cui J. Therapeutic potential of engineering the mitochondrial genome. Biochim Biophys Acta Mol Basis Dis 2023:166804. [PMID: 37429560 DOI: 10.1016/j.bbadis.2023.166804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 04/20/2023] [Revised: 06/29/2023] [Accepted: 07/05/2023] [Indexed: 07/12/2023]
Abstract
Mitochondrial diseases are a group of clinical disorders caused by mutations in the genes encoded by either the nuclear or the mitochondrial genome involved in mitochondrial oxidative phosphorylation. Disorders become evident when mitochondrial dysfunction reaches a cell-specific threshold. Similarly, the severity of disorders is related to the degree of gene mutation. Clinical treatments for mitochondrial diseases mainly rely on symptomatic management. Theoretically, replacing or repairing dysfunctional mitochondria to acquire and preserve normal physiological functions should be effective. Significant advances have been made in gene therapies, including mitochondrial replacement therapy, mitochondrial genome manipulation, nuclease programming, mitochondrial DNA editing, and mitochondrial RNA interference. In this paper, we review the recent progress in these technologies by focusing on advancements that overcome limitations.
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Affiliation(s)
- Mengmeng Liu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Cancer Center, First Hospital of Jilin University, Changchun, Jilin 130061, China
| | - Wei Ji
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Cancer Center, First Hospital of Jilin University, Changchun, Jilin 130061, China
| | - Xin Zhao
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Cancer Center, First Hospital of Jilin University, Changchun, Jilin 130061, China
| | - Xiaoliang Liu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Cancer Center, First Hospital of Jilin University, Changchun, Jilin 130061, China
| | - Ji-Fan Hu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Cancer Center, First Hospital of Jilin University, Changchun, Jilin 130061, China; Stanford University Medical School, VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Jiuwei Cui
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Cancer Center, First Hospital of Jilin University, Changchun, Jilin 130061, China.
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Li C, Deng H, Liu Z, Lv X, Gao W, Gao Y, Gao J, Hu L. Salidroside protect Chinese hamster V79 cells from genotoxicity and oxidative stress induced by CL-20. Toxicol Res (Camb) 2023; 12:133-142. [PMID: 36866208 PMCID: PMC9972843 DOI: 10.1093/toxres/tfad004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 01/09/2023] [Accepted: 01/10/2023] [Indexed: 02/04/2023] Open
Abstract
Hexanitrohexaazaisowurtzitane (CL-20) is a high-energy elemental explosive widely used in chemical and military fields. CL-20 harms environmental fate, biosafety, and occupational health. However, there is little known about the genotoxicity of CL-20, in particular its molecular mechanisms. Therefore, this study was framed to investigate the genotoxic mechanisms of CL-20 in V79 cells and evaluate whether the genotoxicity could be diminished by pretreating the cells with salidroside. The results showed that CL-20-induced genotoxicity in V79 cells primarily through oxidative damage to DNA and mitochondrial DNA (mtDNA) mutation. Salidroside could significantly reduce the inhibitory effect of CL-20 on the growth of V79 cells and reduce the levels of reactive oxygen species (ROS), 8-hydroxy-2 deoxyguanosine (8-OHdG), and malondialdehyde (MDA). Salidroside also restored CL-20-induced superoxide dismutase (SOD) and glutathione (GSH) in V79 cells. As a result, salidroside attenuated the DNA damage and mutations induced by CL-20. In conclusion, oxidative stress may be involved in CL-20-induced genotoxicity in V79 cells. Salidroside could protect V79 cells from oxidative damage induced by CL-20, mechanism of which may be related to scavenging intracellular ROS and increasing the expression of proteins that can promote the activity of intracellular antioxidant enzymes. The present study for the mechanisms and protection of CL-20-mediated genotoxicity will help further to understand the toxic effects of CL-20 and provide information on the therapeutic effect of salidroside in CL-20-induced genotoxicity.
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Affiliation(s)
- Cunzhi Li
- Laboratory for Bone Metabolism, Xi’an Key Laboratory of Special Medicine and Health Engineering, Key Laboratory for Space Biosciences and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, NO.127 Youyi West Road, Beilin District, Xi'an, Shaanxi 710072, China
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Hui Deng
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Zhiyong Liu
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Xiaoqiang Lv
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Wenzhi Gao
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Yongchao Gao
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Junhong Gao
- Toxicology Research Center, Institute for Hygiene of Ordnance Industry, NO. 12 Zhangbadong Road, Yanta District, Xi’an Shaanxi 710065, China
| | - Lifang Hu
- Laboratory for Bone Metabolism, Xi’an Key Laboratory of Special Medicine and Health Engineering, Key Laboratory for Space Biosciences and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, NO.127 Youyi West Road, Beilin District, Xi'an, Shaanxi 710072, China
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Zelissen R, Ahmadian S, Montilla-Rojo J, Timmer E, Ummelen M, Hopman A, Smeets H, van Tienen F. Fusion of Wild-Type Mesoangioblasts with Myotubes of mtDNA Mutation Carriers Leads to a Proportional Reduction in mtDNA Mutation Load. Int J Mol Sci 2023; 24. [PMID: 36769001 DOI: 10.3390/ijms24032679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/15/2023] [Accepted: 01/25/2023] [Indexed: 02/04/2023] Open
Abstract
In 25% of patients with mitochondrial myopathies, pathogenic mitochondrial DNA (mtDNA) mutation are the cause. For heteroplasmic mtDNA mutations, symptoms manifest when the mutation load exceeds a tissue-specific threshold. Therefore, lowering the mutation load is expected to ameliorate disease manifestations. This can be achieved by fusing wild-type mesoangioblasts with mtDNA mutant myotubes. We have tested this in vitro for female carriers of the m.3271T>C or m.3291T>C mutation (mutation load >90%) using wild-type male mesoangioblasts. Individual fused myotubes were collected by a newly-developed laser capture microdissection (LCM) protocol, visualized by immunostaining using an anti-myosin antibody. Fusion rates were determined based on male-female nuclei ratios by fluorescently labelling the Y-chromosome. Using combined 'wet' and 'air dried' LCM imaging improved fluorescence imaging quality and cell yield. Wild-type mesoangioblasts fused in different ratios with myotubes containing either the m.3271T>C or the m.3291T>C mutation. This resulted in the reduction of the mtDNA mutation load proportional to the number of fused wild-type mesoangioblasts for both mtDNA mutations. The proportional reduction in mtDNA mutation load in vitro after fusion is promising in the context of muscle stem cell therapy for mtDNA mutation carriers in vivo, in which we propose the same strategy using autologous wild-type mesoangioblasts.
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Orssaud C, Barraud Lange V, Wolf JP, LeFoll N, Soufir JC. Case Report: Abnormalities of sperm motility and morphology in a patient with Leber hereditary optic neuropathy: Improvement after idebenone therapy. Front Neurol 2023; 13:946559. [PMID: 36686502 PMCID: PMC9845611 DOI: 10.3389/fneur.2022.946559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 05/17/2022] [Accepted: 11/30/2022] [Indexed: 01/05/2023] Open
Abstract
Case We report the sperm characteristics of a male patient who developed, when he was 18 years old, a Leber hereditary optic neuropathy, a hereditary optic neuropathy due to mtDNA mutation as well as variants in the nuclear DNA. At the age of 30 years-old, he complained of infertility lasting for 2 years. Semen analyses showed low motility spermatozoa and a high percentage of morphological or ultrastructural abnormalities. Levels of epididymal markers were strongly atypical. Idebenone was prescribed as treatment of his Leber hereditary optic neuropathy in order to improve his visual acuity. After 5 months of this treatment, motility of spermatozoa increased, and their vitality improved. A natural conception occurred. Outcome This case is the first description of an anomaly of spermatozoas and of the epididymis epithelium in a patient with Leber hereditary optic neuropathy. It draws attention to sperm pathologies in patients with mitochondrial disorders. The role of the mtDNA mutations must be suspected since it plays an important role in the development and motility of spermatozoa. In addition, idebenone can by-pass the complex I and transfer electrons to complex III. It has been suspected to have a favorable effect on spermatogenesis. Conclusion This case confirms the possibility of sperm dysfunction in Leber hereditary optic neuropathy and the interest of idebenone as a treatment for infertility due to mtDNA mutations in human.
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Affiliation(s)
- Christophe Orssaud
- Functional Unit of Ophthalmology, Ophtara Rare disease Center, Sensgène Filière, ERN EYE, European Hospital Georges Pompidou, University Hospital Paris Centre, Assistance Publique de Hôpitaux de Paris, Paris, France,*Correspondence: Christophe Orssaud ✉
| | - Virginie Barraud Lange
- Team Genomic Epigenetic and Physiopathology of Reproduction, Department of Genetic, Development and Cancer, Cochin Institute, Inserm U1016, Paris, France,Laboratory of Histology Embryology Biology of Reproduction, Sorbonne Paris Cité, Faculty of Medicine, University Hospital Paris Centre, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Jean Philippe Wolf
- Team Genomic Epigenetic and Physiopathology of Reproduction, Department of Genetic, Development and Cancer, Cochin Institute, Inserm U1016, Paris, France,Laboratory of Histology Embryology Biology of Reproduction, Sorbonne Paris Cité, Faculty of Medicine, University Hospital Paris Centre, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Nathalie LeFoll
- Laboratory of Histology Embryology Biology of Reproduction, Sorbonne Paris Cité, Faculty of Medicine, University Hospital Paris Centre, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Jean Claude Soufir
- Biologie de la Reproduction, University Hospital Paris Centre, Assistance Publique Hôpitaux de Paris, Paris, France
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Feng J, Chen Z, Liang W, Wei Z, Ding G. Roles of Mitochondrial DNA Damage in Kidney Diseases: A New Biomarker. Int J Mol Sci 2022; 23:ijms232315166. [PMID: 36499488 PMCID: PMC9735745 DOI: 10.3390/ijms232315166] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/27/2022] [Accepted: 11/28/2022] [Indexed: 12/05/2022] Open
Abstract
The kidney is a mitochondria-rich organ, and kidney diseases are recognized as mitochondria-related pathologies. Intact mitochondrial DNA (mtDNA) maintains normal mitochondrial function. Mitochondrial dysfunction caused by mtDNA damage, including impaired mtDNA replication, mtDNA mutation, mtDNA leakage, and mtDNA methylation, is involved in the progression of kidney diseases. Herein, we review the roles of mtDNA damage in different setting of kidney diseases, including acute kidney injury (AKI) and chronic kidney disease (CKD). In a variety of kidney diseases, mtDNA damage is closely associated with loss of kidney function. The level of mtDNA in peripheral serum and urine also reflects the status of kidney injury. Alleviating mtDNA damage can promote the recovery of mitochondrial function by exogenous drug treatment and thus reduce kidney injury. In short, we conclude that mtDNA damage may serve as a novel biomarker for assessing kidney injury in different causes of renal dysfunction, which provides a new theoretical basis for mtDNA-targeted intervention as a therapeutic option for kidney diseases.
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Affiliation(s)
- Jun Feng
- Division of Nephrology, Renmin Hospital of Wuhan University, Wuhan 430060, China
- Nephrology and Urology Research Institute of Wuhan University, Wuhan 430060, China
| | - Zhaowei Chen
- Division of Nephrology, Renmin Hospital of Wuhan University, Wuhan 430060, China
- Nephrology and Urology Research Institute of Wuhan University, Wuhan 430060, China
| | - Wei Liang
- Division of Nephrology, Renmin Hospital of Wuhan University, Wuhan 430060, China
- Nephrology and Urology Research Institute of Wuhan University, Wuhan 430060, China
| | - Zhongping Wei
- Division of Nephrology, Renmin Hospital of Wuhan University, Wuhan 430060, China
- Nephrology and Urology Research Institute of Wuhan University, Wuhan 430060, China
| | - Guohua Ding
- Division of Nephrology, Renmin Hospital of Wuhan University, Wuhan 430060, China
- Nephrology and Urology Research Institute of Wuhan University, Wuhan 430060, China
- Correspondence:
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Chen TH, Koh KY, Lin KMC, Chou CK. Mitochondrial Dysfunction as an Underlying Cause of Skeletal Muscle Disorders. Int J Mol Sci 2022; 23:12926. [PMID: 36361713 PMCID: PMC9653750 DOI: 10.3390/ijms232112926] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/21/2022] [Accepted: 10/21/2022] [Indexed: 09/19/2023] Open
Abstract
Mitochondria are an important energy source in skeletal muscle. A main function of mitochondria is the generation of ATP for energy through oxidative phosphorylation (OXPHOS). Mitochondrial defects or abnormalities can lead to muscle disease or multisystem disease. Mitochondrial dysfunction can be caused by defective mitochondrial OXPHOS, mtDNA mutations, Ca2+ imbalances, mitochondrial-related proteins, mitochondrial chaperone proteins, and ultrastructural defects. In addition, an imbalance between mitochondrial fusion and fission, lysosomal dysfunction due to insufficient biosynthesis, and/or defects in mitophagy can result in mitochondrial damage. In this review, we explore the association between impaired mitochondrial function and skeletal muscle disorders. Furthermore, we emphasize the need for more research to determine the specific clinical benefits of mitochondrial therapy in the treatment of skeletal muscle disorders.
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Affiliation(s)
- Tsung-Hsien Chen
- Department of Internal Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi 60002, Taiwan
| | - Kok-Yean Koh
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi 60002, Taiwan
| | - Kurt Ming-Chao Lin
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Zhunan 35053, Taiwan
| | - Chu-Kuang Chou
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi 60002, Taiwan
- Obesity Center, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi 60002, Taiwan
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Cai M, Yu Q, Bao J. A case report of mitochondrial myopathy with membranous nephropathy. BMC Nephrol 2022; 23:87. [PMID: 35246049 PMCID: PMC8895630 DOI: 10.1186/s12882-022-02710-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 02/20/2022] [Indexed: 11/10/2022] Open
Abstract
Background MtDNA 3243 A > G mutation leads to mitochondrial myopathies with predominant hyperlactatemia. Given the ubiquitous nature of mitochondria, cellular dysfunction can also appear in tissues with high metabolic turnover; thus, there can be cardiac, digestive, ophthalmologic, and kidney complications. MtDNA 3243 A > G mutation has been shown to be with renal involvement in the previous cases of which are FSGS and tubularinterstitial nephritis. Case presentation We report a case of patient who had the mitochondrial myopathy with mitochondrial DNA (mtDNA) 3243 A > G mutation diagnosed membranous nephropathy by kidney biopsy, which was never reported before. Our patient was found to have chest tightness and shortness of breath with hyperlactatemia and was diagnosed mitochondrial myopathy with mtDNA 3243 A > G mutation 11 months ago. Acute kidney injury occurred with hyperuricemia (urid acid 1011umol/L) which may be associated with mtDNA mutation. Since then, persistent proteinuria was also found and the 24-h urine protein quantitative was around 2 g. Kidney biopsy was performed and the result was consistent with membranous nephropathy, with abnormal mitochondria seen in renal tubules by electron microscopy. Conclusions Patients with mitochondrial myopathy could also have renal presentation of membranous nephropathy. Patients with mtDNA mutation may have various renal manifestations so that more attention should be paid on their kidneys.
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Affiliation(s)
- Minchao Cai
- Department of Nephrology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No. 100, Haining Road, Shanghai, 200080, People's Republic of China
| | - Qing Yu
- Department of Nephrology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No. 100, Haining Road, Shanghai, 200080, People's Republic of China
| | - Jinfang Bao
- Department of Nephrology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No. 100, Haining Road, Shanghai, 200080, People's Republic of China.
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Saleh Jaweesh M, Hammadeh ME, Dahadhah FW, Al Zoubi MS, Amor H. Association between the single nucleotide variants of the mitochondrial cytochrome B gene (MT-CYB) and the male infertility. Mol Biol Rep 2022; 49:3609-3616. [PMID: 35118571 PMCID: PMC9174114 DOI: 10.1007/s11033-022-07200-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 01/26/2022] [Indexed: 11/25/2022]
Abstract
Background Idiopathic male infertility can be attributed to genetic predispositions that affect sperm performance and function. Genetic alterations in the mitochondrial DNA (mtDNA) have been linked to certain types of male infertility and abnormal sperm function. Mutations in the mitochondrial cytochrome B (MT-CYB) gene might lead to some deficiencies in mitochondrial function. Thus, in the current study, we aimed to investigate the effect of mutations in the MT-CYB gene on sperm motility and male infertility. Methods and results Semen specimens were collected from 111 men where 67 men were subfertile and 44 were fertile. QIAamp DNA Mini Kit and REPLI-g Mitochondrial DNA Kit from QIAGEN were used to isolate and amplify the mitochondrial DNA. Followed by PCR and Sanger sequencing for the target sequence in the MT-CYP gene. Sequencing of the MT-CYB gene revealed a total of thirteen single nucleotide polymorphisms (SNPs). Eight SNPs were non-synonymous variant (missense variant) including: rs2853508, rs28357685, rs41518645, rs2853507, rs28357376, rs35070048, rs2853506, and rs28660155. While five SNPs were Synonymous variant: rs527236194, rs28357373, rs28357369, rs41504845, and rs2854124. Among these SNPs, three variants showed a significant difference in the frequency of the genotypes between subfertile and fertile groups: rs527236194 (T15784C) (P = 0.0005), rs28357373 (T15629C) (P = 0.0439), and rs41504845 (C15833T) (P = 0.0038). Moreover, two SNPs showed a significant association between allelic frequencies of rs527236194 (T15784C) (P = 0.0014) and rs41504845 (C15833T) (P = 0.0147) and male subfertility. Conclusion The current study showed a significant association between the MT-CYB gene polymorphisms and the development of male infertility. In particular, rs527236194, rs28357373 and rs41504845 variants were found to be the most related to the subfertility group. Further studies on larger and other populations are required to reveal the exact role of this gene in the development of male infertility. In addition, functional studies will be helpful to elucidate the molecular impact of the MT-CYP polymorphisms on mitochondrial function.
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Affiliation(s)
- Mayyas Saleh Jaweesh
- Department of Obstetrics & Gynaecology, Saarland University, Homburg, Saar, Germany.
| | - Mohamad Eid Hammadeh
- Department of Obstetrics & Gynaecology, Saarland University, Homburg, Saar, Germany
| | - Fatina W Dahadhah
- Department of Obstetrics & Gynaecology, Saarland University, Homburg, Saar, Germany
| | - Mazhar Salim Al Zoubi
- Department of Basic Medical Sciences, Faculty of Medicine, Yarmouk University, Irbid, 21163, Jordan
| | - Houda Amor
- Department of Obstetrics & Gynaecology, Saarland University, Homburg, Saar, Germany
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Wang J, Balciuniene J, Diaz-Miranda MA, McCormick EM, Aref-Eshghi E, Muir AM, Cao K, Troiani J, Moseley A, Fan Z, Zolkipli-Cunningham Z, Goldstein A, Ganetzky RD, Muraresku CC, Peterson JT, Spinner NB, Wallace DC, Dulik MC, Falk MJ. Advanced approach for comprehensive mtDNA genome testing in mitochondrial disease. Mol Genet Metab 2022; 135:93-101. [PMID: 34969639 PMCID: PMC8877466 DOI: 10.1016/j.ymgme.2021.12.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 01/16/2023]
Abstract
Mitochondrial disease diagnosis requires interrogation of both nuclear and mitochondrial (mtDNA) genomes for single-nucleotide variants (SNVs) and copy number alterations, both in the proband and often maternal relatives, together with careful phenotype correlation. We developed a comprehensive mtDNA sequencing test ('MitoGenome') using long-range PCR (LR-PCR) to amplify the full length of the mtDNA genome followed by next generation sequencing (NGS) to accurately detect SNVs and large-scale mtDNA deletions (LSMD), combined with droplet digital PCR (ddPCR) for LSMD heteroplasmy quantification. Overall, MitoGenome tests were performed on 428 samples from 394 patients with suspected or confirmed mitochondrial disease. The positive yield was 11% (43/394), including 34 patients with pathogenic or likely pathogenic SNVs (the most common being m.3243A > G in 8/34 (24%) patients), 8 patients with single LSMD, and 3 patients with multiple LSMD exceeding 10% heteroplasmy levels. Two patients with both LSMD and pathogenic SNV were detected. Overall, this LR-PCR/NGS assay provides a highly accurate and comprehensive diagnostic method for simultaneous mtDNA SNV detection at heteroplasmy levels as low as 1% and LSMD detection at heteroplasmy levels below 10%. Inclusion of maternal samples for variant classification and ddPCR to quantify LSMD heteroplasmy levels further enables accurate pathogenicity assessment and clinical correlation interpretation of mtDNA genome sequence variants and copy number alterations.
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Affiliation(s)
- Jing Wang
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jorune Balciuniene
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Maria Alejandra Diaz-Miranda
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Elizabeth M McCormick
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Erfan Aref-Eshghi
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Alison M Muir
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Kajia Cao
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Juliana Troiani
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Alicia Moseley
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Zhiqian Fan
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Zarazuela Zolkipli-Cunningham
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Amy Goldstein
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Rebecca D Ganetzky
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Colleen C Muraresku
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - James T Peterson
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Nancy B Spinner
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Douglas C Wallace
- Center for Mitochondrial and Epigenomic Medicine, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Matthew C Dulik
- Division of Genomic Diagnostics, Department of Pathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
| | - Marni J Falk
- Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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Maalej M, Kammoun F, Kharrat M, Bouchaala W, Ammar M, Mkaouar-Rebai E, Triki C, Fakhfakh F. A first description of ataxia with vitamin E deficiency associated with MT-TG gene mutation. Acta Neurol Belg 2021; 121:1733-1740. [PMID: 32979145 DOI: 10.1007/s13760-020-01490-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 09/04/2020] [Indexed: 11/26/2022]
Abstract
Ataxia with isolated vitamin E deficiency (AVED) is a rare autosomal recessive cerebellar ataxia disorder that is caused by a mutation in the alpha-tocopherol transfer protein gene TTPA, leading to a lower level of serum vitamin E. Although it is almost clinically similar to Friedreich's ataxia, its devastating neurological features can be prevented with appropriate treatment. In this study, we present a patient who was initially diagnosed with Friedreich's ataxia, but was later found to have AVED. Frataxin gene screening revealed the absence of GAA expansion in homozygous or heterozygous state. However, TTPAgene sequencing showed the presence of the c.744delA mutation, leading to a premature stop codon (p.E249fx). In addition, the result of mutational analysis of MT-DNA genes revealed the presence of several variants, including the m.10044A>G mutation in MT-TG gene. Here, we report for the first time the coexistence of both mitochondrial and nuclear genes mutations in AVED.
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Affiliation(s)
- Marwa Maalej
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax, Tunisia.
| | - Fatma Kammoun
- Unit of Pediatric Neurology research (UR12ES 16), C.H.U. Hedi Chaker, Sfax, Tunisia
| | - Marwa Kharrat
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax, Tunisia
| | - Wafa Bouchaala
- Unit of Pediatric Neurology research (UR12ES 16), C.H.U. Hedi Chaker, Sfax, Tunisia
| | - Marwa Ammar
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax, Tunisia
| | - Emna Mkaouar-Rebai
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax, Tunisia
| | - Chahnez Triki
- Unit of Pediatric Neurology research (UR12ES 16), C.H.U. Hedi Chaker, Sfax, Tunisia
| | - Faiza Fakhfakh
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax, Tunisia.
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13
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Jeppesen TD, Madsen KL, Poulsen NS, Løkken N, Vissing J. Exercise Testing, Physical Training and Fatigue in Patients with Mitochondrial Myopathy Related to mtDNA Mutations. J Clin Med 2021; 10:1796. [PMID: 33924201 DOI: 10.3390/jcm10081796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 01/05/2023] Open
Abstract
Mutations in mitochondrial DNA (mtDNA) cause disruption of the oxidative phosphorylation chain and impair energy production in cells throughout the human body. Primary mitochondrial disorders due to mtDNA mutations can present with symptoms from adult-onset mono-organ affection to death in infancy due to multi-organ involvement. The heterogeneous phenotypes that patients with a mutation of mtDNA can present with are thought, at least to some extent, to be a result of differences in mtDNA mutation load among patients and even among tissues in the individual. The most common symptom in patients with mitochondrial myopathy (MM) is exercise intolerance. Since mitochondrial function can be assessed directly in skeletal muscle, exercise studies can be used to elucidate the physiological consequences of defective mitochondria due to mtDNA mutations. Moreover, exercise tests have been developed for diagnostic purposes for mitochondrial myopathy. In this review, we present the rationale for exercise testing of patients with MM due to mutations in mtDNA, evaluate the diagnostic yield of exercise tests for MM and touch upon how exercise tests can be used as tools for follow-up to assess disease course or effects of treatment interventions.
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14
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Pozzi A, Dowling DK. Small mitochondrial RNAs as mediators of nuclear gene regulation, and potential implications for human health. Bioessays 2021; 43:e2000265. [PMID: 33763872 DOI: 10.1002/bies.202000265] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 03/03/2021] [Accepted: 03/05/2021] [Indexed: 02/06/2023]
Abstract
Much research has focused on the effects of pathogenic mitochondrial mutations on health. Notwithstanding, the mechanisms regulating the link between these mutations and their effects remain elusive in several cases. Here, we propose that certain mitochondrial mutations may disrupt function of a set of mitochondrial-transcribed small RNAs, perturbing communication between mitochondria and nucleus, leading to disease. Our hypothesis synthesises two lines of supporting evidence. First, several mitochondrial mutations cannot be directly linked to effects on energy production or protein synthesis. Second, emerging studies have described the existence of small RNAs encoded by the mitochondria and proposed their involvement in RNA interference. We present a roadmap to testing this hypothesis.
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Affiliation(s)
- Andrea Pozzi
- School of Biological Sciences, Monash University, Melbourne, Victoria, Australia
| | - Damian K Dowling
- School of Biological Sciences, Monash University, Melbourne, Victoria, Australia
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15
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Chatzovoulou K, Mayeur A, Gigarel N, Jabot-Hanin F, Hesters L, Munnich A, Frydman N, Bonnefont JP, Steffann J. Mitochondrial DNA mutations do not impact early human embryonic development. Mitochondrion 2021; 58:59-63. [PMID: 33639270 DOI: 10.1016/j.mito.2021.02.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 02/08/2021] [Accepted: 02/12/2021] [Indexed: 11/20/2022]
Abstract
Mitochondrial DNA (mtDNA) mutations cause severe maternally inherited disorders, although mechanisms regulating mother-to-offspring transmission have not yet been elucidated. To investigate if mtDNA mutations affect embryonic development, we compared morphology, viability and mtDNA content in control (n = 165) and mitochondrial (n = 16) human embryos at the cleavage-stage. mtDNA copy number (CN) was assessed in one or two embryonic cells, by real-time PCR. The presence of a maternal or embryonic mtDNA mutation did not impact on either embryonic quality or viability. mtDNA CN was not altered by mtDNA mutations, suggesting that mtDNA defects do not modify mtDNA metabolism at this early stage.
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16
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Markin AM, Khotina VA, Zabudskaya XG, Bogatyreva AI, Starodubova AV, Ivanova E, Nikiforov NG, Orekhov AN. Disturbance of Mitochondrial Dynamics and Mitochondrial Therapies in Atherosclerosis. Life (Basel) 2021; 11:life11020165. [PMID: 33672784 PMCID: PMC7924632 DOI: 10.3390/life11020165] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/13/2021] [Accepted: 02/17/2021] [Indexed: 12/13/2022] Open
Abstract
Mitochondrial dysfunction is associated with a wide range of chronic human disorders, including atherosclerosis and diabetes mellitus. Mitochondria are dynamic organelles that undergo constant turnover in living cells. Through the processes of mitochondrial fission and fusion, a functional population of mitochondria is maintained, that responds to the energy needs of the cell. Damaged or excessive mitochondria are degraded by mitophagy, a specialized type of autophagy. These processes are orchestrated by a number of proteins and genes, and are tightly regulated. When one or several of these processes are affected, it can lead to the accumulation of dysfunctional mitochondria, deficient energy production, increased oxidative stress and cell death—features that are described in many human disorders. While severe mitochondrial dysfunction is known to cause specific and mitochondrial disorders in humans, progressing damage of the mitochondria is also observed in a wide range of other chronic diseases, including cancer and atherosclerosis, and appears to play an important role in disease development. Therefore, correction of mitochondrial dynamics can help in developing new therapies for the treatment of these conditions. In this review, we summarize the recent knowledge on the processes of mitochondrial turnover and the proteins and genes involved in it. We provide a list of known mutations that affect mitochondrial function, and discuss the emerging therapeutic approaches.
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Affiliation(s)
- Alexander M. Markin
- Laboratory of Cellular and Molecular Pathology of Cardiovascular System, Institute of Human Morphology, 117418 Moscow, Russia; (A.M.M.); (V.A.K.); (A.I.B.); (N.G.N.); (A.N.O.)
| | - Viktoria A. Khotina
- Laboratory of Cellular and Molecular Pathology of Cardiovascular System, Institute of Human Morphology, 117418 Moscow, Russia; (A.M.M.); (V.A.K.); (A.I.B.); (N.G.N.); (A.N.O.)
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 8, Baltiyskaya St., 125315 Moscow, Russia
| | - Xenia G. Zabudskaya
- FSBI National Medical Research Center of Oncology named after N.N. Blokhin of the Ministry of Health of Russia, 115478 Moscow, Russia;
| | - Anastasia I. Bogatyreva
- Laboratory of Cellular and Molecular Pathology of Cardiovascular System, Institute of Human Morphology, 117418 Moscow, Russia; (A.M.M.); (V.A.K.); (A.I.B.); (N.G.N.); (A.N.O.)
| | - Antonina V. Starodubova
- Federal Research Centre for Nutrition, Biotechnology and Food Safety, Ustinsky Passage, 109240 Moscow, Russia;
| | - Ekaterina Ivanova
- Department of Basic Research, Institute of Atherosclerosis Research, 121609 Moscow, Russia
- Correspondence: ; Tel./Fax: +7-(495)4159594
| | - Nikita G. Nikiforov
- Laboratory of Cellular and Molecular Pathology of Cardiovascular System, Institute of Human Morphology, 117418 Moscow, Russia; (A.M.M.); (V.A.K.); (A.I.B.); (N.G.N.); (A.N.O.)
- National Medical Research Center of Cardiology, Institute of Experimental Cardiology, 117418 Moscow, Russia
- Institute of Gene Biology, Centre of collective usage, 119344 Moscow, Russia
| | - Alexander N. Orekhov
- Laboratory of Cellular and Molecular Pathology of Cardiovascular System, Institute of Human Morphology, 117418 Moscow, Russia; (A.M.M.); (V.A.K.); (A.I.B.); (N.G.N.); (A.N.O.)
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 8, Baltiyskaya St., 125315 Moscow, Russia
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17
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Guo S, Zhou K, Yuan Q, Su L, Liu Y, Ji X, Gu X, Guo X, Xing J. An innovative data analysis strategy for accurate next-generation sequencing detection of tumor mitochondrial DNA mutations. Mol Ther Nucleic Acids 2021; 23:232-43. [PMID: 33376630 DOI: 10.1016/j.omtn.2020.11.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 11/05/2020] [Indexed: 11/22/2022]
Abstract
Next-generation sequencing technology has been commonly applied to detect mitochondrial DNA (mtDNA) mutations, which are reported to be strongly associated with cancers. However, several key challenges still exist regarding bioinformatics analysis of mtDNA sequencing data that greatly affect the detection accuracy of mtDNA mutations. Here we comprehensively evaluated several key analysis procedures in three different sample types. We found that a trimming procedure was essential for improving mtDNA mapping performance in plasma but not tissue samples. Mapping with a revised Cambridge reference sequence and human genome 19 reference was strongly suggested for mtDNA mutation detection in plasma samples because of the extreme abundance of nuclear DNA of mitochondrial origin. Moreover, our results showed that a setting of 3 mismatches was most appropriate for mtDNA mutation calling. Importantly, we revealed the presence of a negative logarithmic relationship between mtDNA site sequencing depth and minimum detectable mutation frequency and built an innovative and efficient filtering strategy to increase the accuracy and sensitivity of mutation detection. Finally, we verified that higher sequencing depth was required for a PCR-based compared with a capture-based enrichment strategy. We established an innovative data analysis strategy that is of great significance for improving the accuracy of mtDNA mutation detection for different types of tumor samples.
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18
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Bagge EK, Fujimori-Tonou N, Kubota-Sakashita M, Kasahara T, Kato T. Unbiased PCR-free spatio-temporal mapping of the mtDNA mutation spectrum reveals brain region-specific responses to replication instability. BMC Biol 2020; 18:150. [PMID: 33097039 PMCID: PMC7585204 DOI: 10.1186/s12915-020-00890-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 10/06/2020] [Indexed: 12/24/2022] Open
Abstract
Background The accumulation of mtDNA mutations in different tissues from various mouse models has been widely studied especially in the context of mtDNA mutation-driven ageing but has been confounded by the inherent limitations of the most widely used approaches. By implementing a method to sequence mtDNA without PCR amplification prior to library preparation, we map the full unbiased mtDNA mutation spectrum across six distinct brain regions from mice. Results We demonstrate that ageing-induced levels of mtDNA mutations (single nucleotide variants and deletions) reach stable levels at 50 weeks of age but can be further elevated specifically in the cortex, nucleus accumbens (NAc), and paraventricular thalamic nucleus (PVT) by expression of a proof-reading-deficient mitochondrial DNA polymerase, PolgD181A. The increase in single nucleotide variants increases the fraction of shared SNVs as well as their frequency, while characteristics of deletions remain largely unaffected. In addition, PolgD181A also induces an ageing-dependent accumulation of non-coding control-region multimers in NAc and PVT, a feature that appears almost non-existent in wild-type mice. Conclusions Our data provide a novel view of the spatio-temporal accumulation of mtDNA mutations using very limited tissue input. The differential response of brain regions to a state of replication instability provides insight into a possible heterogenic mitochondrial landscape across the brain that may be involved in the ageing phenotype and mitochondria-associated disorders.
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Affiliation(s)
- Emilie Kristine Bagge
- Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Center for Brain Science, Wako, Saitama, Japan
| | - Noriko Fujimori-Tonou
- Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Center for Brain Science, Wako, Saitama, Japan.,Current address: Support Unit for Bio-Material Analysis, Research Resources Division, RIKEN Center for Brain Science, Wako, Saitama, Japan
| | - Mie Kubota-Sakashita
- Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Center for Brain Science, Wako, Saitama, Japan
| | - Takaoki Kasahara
- Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Center for Brain Science, Wako, Saitama, Japan.,Current address: Career Development Program, RIKEN Center for Brain Science, Wako, Saitama, Japan
| | - Tadafumi Kato
- Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Center for Brain Science, Wako, Saitama, Japan. .,Department of Psychiatry and Behavioral Science, Juntendo University, Graduate School of Medicine, Hongo 2-1-1, Bunkyo, Tokyo 113-8421, Japan.
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19
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Jeppesen TD, Duno M, Vissing J. Mutation Load of Single, Large-Scale Deletions of mtDNA in Mitotic and Postmitotic Tissues. Front Genet 2020; 11:547638. [PMID: 33133144 PMCID: PMC7566915 DOI: 10.3389/fgene.2020.547638] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 08/26/2020] [Indexed: 11/22/2022] Open
Abstract
It is generally accepted that patients with chronic progressive ophthalmoplegia caused by single large-scale deletion (SLD) of mitochondrial DNA (mtDNA) only harbor mutation in skeletal and eye muscles. The aim of this study was to investigate the presence and the level of heteroplasmy of mtDNA deletions in mitotic tissues of patients displaying mtDNA deletion of mitotic tissues in patients with SLDs and pure muscle phenotype. MtDNA mutation load was studied in three mitotic (urine epithelial cells, buccal mucosa, and blood) and one postmitotic (skeletal muscle) tissues in 17 patients with SLDs of mtDNA and pure muscle involvement. All patients had mtDNA deletion in skeletal muscle, and 78% of the patients also displayed the mtDNA deletion in mitotic tissues. The mtDNA mutation load was higher in skeletal muscle versus mitotic tissues. The mtDNA mutation load did not correlate with age of sampling of tissues, but there was a correlation between the mtDNA mutations load in skeletal muscle and (1) the site of 5′ end breaking point of the SLD, (2) the size of SLD, (3) the number of affected tRNAs, and (4) age at onset (r > 0.58, P < 0.05). The findings indicate that mtDNA mutation in mitotic tissue is common in patients with SLDs of mtDNA. The lack of correlation between age of tissue sampling, age at onset, and mtDNA mutation load in mitotic tissues indicates that there is no extensive post-natal modification of mtDNA mutation load in mitotic tissues of patients with pure muscle phenotype.
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Affiliation(s)
- Tina D Jeppesen
- Copenhagen Neuromuscular Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Morten Duno
- Department of Clinical Genetics, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - John Vissing
- Copenhagen Neuromuscular Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
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20
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Schon KR, Ratnaike T, van den Ameele J, Horvath R, Chinnery PF. Mitochondrial Diseases: A Diagnostic Revolution. Trends Genet 2020; 36:702-717. [PMID: 32674947 DOI: 10.1016/j.tig.2020.06.009] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 12/26/2022]
Abstract
Mitochondrial disorders have emerged as a common cause of inherited disease, but are traditionally viewed as being difficult to diagnose clinically, and even more difficult to comprehensively characterize at the molecular level. However, new sequencing approaches, particularly whole-genome sequencing (WGS), have dramatically changed the landscape. The combined analysis of nuclear and mitochondrial DNA (mtDNA) allows rapid diagnosis for the vast majority of patients, but new challenges have emerged. We review recent discoveries that will benefit patients and families, and highlight emerging questions that remain to be resolved.
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Affiliation(s)
- Katherine R Schon
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK; Medical Research Council (MRC) Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK
| | - Thiloka Ratnaike
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK; Medical Research Council (MRC) Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK; Department of Paediatrics, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK
| | - Jelle van den Ameele
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK; Medical Research Council (MRC) Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK
| | - Rita Horvath
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK
| | - Patrick F Chinnery
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK; Medical Research Council (MRC) Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.
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21
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Chen D, Zhao Q, Xiong J, Lou X, Han Q, Wei X, Xie J, Li X, Zhou H, Shen L, Yang Y, Fang H, Lyu J. Systematic analysis of a mitochondrial disease-causing ND6 mutation in mitochondrial deficiency. Mol Genet Genomic Med 2020; 8:e1199. [PMID: 32162843 PMCID: PMC7216815 DOI: 10.1002/mgg3.1199] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 02/07/2020] [Accepted: 02/14/2020] [Indexed: 12/24/2022] Open
Abstract
Background The m.14487T>C mutation is recognized as a diagnostic mutation of mitochondrial disease during the past 16 years, emerging evidence suggests that mutant loads of m.14487T>C and disease phenotype are not closely correlated. Methods Immortalized lymphocytes were generated by coculturing the Epstein–Barr virus and lymphocytes from m.14487T>C carrier Chinese patient with Leigh syndrome. Fifteen cytoplasmic hybrid (cybrid) cell lines were generated by fusing mtDNA lacking 143B cells with platelets donated by patients. Mitochondrial function was systematically analyzed at transcriptomic, metabolomic, and biochemical levels. Results Unlike previous reports, we found that the assembly of mitochondrial respiratory chain complexes, mitochondrial respiration, and mitochondrial OXPHOS function was barely affected in cybrid cells carrying homoplastic m.14487T>C mutation. Mitochondrial dysfunction associated transcriptomic and metabolomic reprogramming were not detected in cybrid carrying homoplastic m.14487T>C. However, we found that mitochondrial function was impaired in patient‐derived immortalized lymphocytes. Conclusion Our data revealed that m.14487T>C mutation is insufficient to cause mitochondrial deficiency; additional modifier genes may be involved in m.14487T>C‐associated mitochondrial disease. Our results further demonstrated that a caution should be taken by solely use of m.14487T>C mutation for molecular diagnosis of mitochondrial disease.
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Affiliation(s)
- Deyu Chen
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Qiongya Zhao
- Zhejiang Provincial People's Hospital, Affiliated People's Hospital of Hangzhou Medical College, College of Laboratory Medicine, Hangzhou Medical College, Hangzhou, China
| | - Jingting Xiong
- Department of Laboratory Medicine, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaoting Lou
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Qinxia Han
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Xiujuan Wei
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Jie Xie
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Xueyun Li
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Huaibin Zhou
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Lijun Shen
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Yanling Yang
- Department of Pediatrics, Peking University First Hospital, Peking University, Beijing, China
| | - Hezhi Fang
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China
| | - Jianxin Lyu
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou, China.,Zhejiang Provincial People's Hospital, Affiliated People's Hospital of Hangzhou Medical College, College of Laboratory Medicine, Hangzhou Medical College, Hangzhou, China
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22
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van Tienen F, Zelissen R, Timmer E, van Gisbergen M, Lindsey P, Quattrocelli M, Sampaolesi M, Mulder-den Hartog E, de Coo I, Smeets H. Healthy, mtDNA-mutation free mesoangioblasts from mtDNA patients qualify for autologous therapy. Stem Cell Res Ther 2019; 10:405. [PMID: 31864395 PMCID: PMC6925445 DOI: 10.1186/s13287-019-1510-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/13/2019] [Accepted: 11/26/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Myopathy and exercise intolerance are prominent clinical features in carriers of a point-mutation or large-scale deletion in the mitochondrial DNA (mtDNA). In the majority of patients, the mtDNA mutation is heteroplasmic with varying mutation loads between tissues of an individual. Exercise-induced muscle regeneration has been shown to be beneficial in some mtDNA mutation carriers, but is often not feasible for this patient group. In this study, we performed in vitro analysis of mesoangioblasts from mtDNA mutation carriers to assess their potential to be used as source for autologous myogenic cell therapy. METHODS We assessed the heteroplasmy level of patient-derived mesoangioblasts, isolated from skeletal muscle of multiple carriers of different mtDNA point-mutations (n = 25). Mesoangioblast cultures with < 10% mtDNA mutation were further analyzed with respect to immunophenotype, proliferation capacity, in vitro myogenic differentiation potential, mitochondrial function, and mtDNA quantity. RESULTS This study demonstrated that mesoangioblasts in half of the patients contained no or a very low mutation load (< 10%), despite a much higher mutation load in their skeletal muscle. Moreover, none of the large-scale mtDNA deletion carriers displayed the deletion in mesoangioblasts, despite high percentages in skeletal muscle. The mesoangioblasts with no or a very low mutation load (< 10%) displayed normal mitochondrial function, proliferative capacity, and myogenic differentiation capacity. CONCLUSIONS Our data demonstrates that in half of the mtDNA mutation carriers, their mesoangioblasts are (nearly) mutation free and can potentially be used as source for autologous cell therapy for generation of new muscle fibers without mtDNA mutation and normal mitochondrial function.
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Affiliation(s)
- Florence van Tienen
- Department of Clinical Genetics, Maastricht University Medical Centre+, Maastricht, The Netherlands.,School for Developmental Biology and Oncology (GROW), Maastricht University Medical Centre+, P.O. box 616, 6200MD, Maastricht, The Netherlands.,School for Mental Health and Neurosciences (MHeNS), Maastricht University Medical Centre+, Maastricht, The Netherlands.,Department of Genetics and Cell Biology, Division Clinical Genomics, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Ruby Zelissen
- School for Developmental Biology and Oncology (GROW), Maastricht University Medical Centre+, P.O. box 616, 6200MD, Maastricht, The Netherlands.,Department of Genetics and Cell Biology, Division Clinical Genomics, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Erika Timmer
- School for Developmental Biology and Oncology (GROW), Maastricht University Medical Centre+, P.O. box 616, 6200MD, Maastricht, The Netherlands.,Department of Genetics and Cell Biology, Division Clinical Genomics, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Marike van Gisbergen
- School for Developmental Biology and Oncology (GROW), Maastricht University Medical Centre+, P.O. box 616, 6200MD, Maastricht, The Netherlands.,Department of Radiation Oncology (MaastRO Lab), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Patrick Lindsey
- Department of Genetics and Cell Biology, Division Clinical Genomics, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Mattia Quattrocelli
- Translational Cardiomyology, Department of Development and Regeneration, KU Leuven, Leuven, Belgium.,Center for Genetic Medicine, Northwestern University, Chicago, USA
| | - Maurilio Sampaolesi
- Translational Cardiomyology, Department of Development and Regeneration, KU Leuven, Leuven, Belgium.,Human Anatomy Unit, Department of Public Health, Experimental and Forensic Medicine, University of Pavia, Pavia, Italy
| | - Elvira Mulder-den Hartog
- Department of Pediatric Surgery, Erasmus Medical Center, Rotterdam, The Netherlands.,Neuromuscular and Mitochondrial research center (NeMo), Rotterdam/Maastricht, The Netherlands
| | - Irenaeus de Coo
- School for Mental Health and Neurosciences (MHeNS), Maastricht University Medical Centre+, Maastricht, The Netherlands.,Department of Genetics and Cell Biology, Division Clinical Genomics, Maastricht University Medical Centre+, Maastricht, The Netherlands.,Neuromuscular and Mitochondrial research center (NeMo), Rotterdam/Maastricht, The Netherlands
| | - Hubert Smeets
- School for Developmental Biology and Oncology (GROW), Maastricht University Medical Centre+, P.O. box 616, 6200MD, Maastricht, The Netherlands. .,School for Mental Health and Neurosciences (MHeNS), Maastricht University Medical Centre+, Maastricht, The Netherlands. .,Department of Genetics and Cell Biology, Division Clinical Genomics, Maastricht University Medical Centre+, Maastricht, The Netherlands.
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23
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Jahani MM, Azimi Meibody A, Karimi T, Banoei MM, Houshmand M. An A10398G mitochondrial DNA alteration is related to increased risk of breast cancer, and associates with Her2 positive receptor. Mitochondrial DNA A DNA Mapp Seq Anal 2019; 31:11-16. [PMID: 31797714 DOI: 10.1080/24701394.2019.1695788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Breast cancer is the most common malignancy and the second leading cause of cancer deaths among women worldwide after lung cancer. Mitochondria play a central role in the regulation of cellular function, metabolism, and cell death in cancer cells. We aim to examine the mitochondrial polymorphisms of complex I in association with breast cancer in an Iranian cohort.This experimental study includes 53 patients with breast cancer and 35 healthy control patients. In addition, tumor-adjacent normal breast tissue was obtained from each patient. The DNA of the tissue cells was extracted and analyzed for complex I mutations using a PCR sequencing method. Our results show 94 mtDNA complex I variants in tumor tissues. A10398G was the most prevalent polymorphism and strongly correlated with Her2 receptor in tumor tissue samples. Mitochondrial DNA (mtDNA) mutations have been widely linked to the etiology of numerous disorders. The mtDNA mutations screening on A10398G along with other mutations might provide insight on the role of mitochondrial mutations in breast cancer.
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Affiliation(s)
- Mohammad Mehdi Jahani
- Department of Genetics and Molecular Biology, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Azita Azimi Meibody
- Department of Emergency Medicine, Faculty of Medicine, University of Isfahan, Isfahan, Iran
| | - Talie Karimi
- Department of Medical Genetic, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | - Mohammad Mehdi Banoei
- Department of Critical Care Medicine, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Massoud Houshmand
- Department of Medical Genetic, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran.,Research Center, Knowledge University, Erbil, Kurdistan Region, Iraq
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24
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Al Zoubi MS, Al-Batayneh K, Alsmadi M, Rashed M, Al-Trad B, Al Khateeb W, Aljabali A, Otoum O, Al-Talib M, Batiha O. 4,977-bp human mitochondrial DNA deletion is associated with asthenozoospermic infertility in Jordan. Andrologia 2019; 52:e13379. [PMID: 31746488 DOI: 10.1111/and.13379] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 05/13/2019] [Revised: 06/30/2019] [Accepted: 07/04/2019] [Indexed: 12/29/2022] Open
Abstract
Male infertility is commonly associated with sperm abnormalities including asthenozoospermia. The molecular basis of asthenozoospermia was linked to mitochondrial DNA (mtDNA) mutations. The 4,977-bp human mtDNA deletion is one of the most common mutations of spermatozoa and results in loss of about 33% of the mitochondrial genome. In this preliminary study, we aimed to investigate the presence of 4,977-bp mtDNA deletion in asthenozoospermic infertile men in Jordan. Semen specimens of 120 asthenozoospermic infertile men and 80 normozoospermic individuals were collected at the in vitro fertilization unit. MtDNA was extracted after the enrichment of spermatozoa; then, polymerase chain reaction was performed using 4,977-bp mtDNA deletion-specific primers. The deletion of 4,977-bp mtDNA was detected in 79.2% of asthenozoospermic patients compared to 10% in normozoospermic controls. The results showed a significant association between the presence of 4,977-bp mtDNA deletion and the asthenozoospermia and infertility (OR = 34.2000, 95% CI = 14.57-80.26, p-value < .001). In conclusion, our findings underscored a strong association between 4,977-bp mtDNA deletion and asthenozoospermia in the Jordanian population.
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Affiliation(s)
- Mazhar S Al Zoubi
- Department of Basic Medical Sciences, Faculty of Medicine, Yarmouk University, Irbid, Jordan
| | - Khalid Al-Batayneh
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Mohammad Alsmadi
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | | | - Bahaa Al-Trad
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Wesam Al Khateeb
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Alaa Aljabali
- Faculty of Pharmacy, Yarmouk University, Irbid, Jordan
| | - Osama Otoum
- Department of Biological Sciences, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Mohammad Al-Talib
- Department of Statistics, Faculty of Sciences, Yarmouk University, Irbid, Jordan
| | - Osamah Batiha
- Department of Applied Biological Sciences, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
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25
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Zhang L, Fu C, Li J, Zhao Z, Hou Y, Zhou W, Fu A. Discovery of a Ruthenium Complex for the Theranosis of Glioma through Targeting the Mitochondrial DNA with Bioinformatic Methods. Int J Mol Sci 2019; 20:E4643. [PMID: 31546801 DOI: 10.3390/ijms20184643] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 09/05/2019] [Accepted: 09/17/2019] [Indexed: 12/11/2022] Open
Abstract
Glioma is the most aggressive and lethal brain tumor in humans. Mutations of mitochondrial DNA (mtDNA) are commonly found in tumor cells and are closely associated with tumorigenesis and progress. However, glioma-specific inhibitors that reflect the unique feature of tumor cells are rare. Here we uncover RC-7, a ruthenium complex with strong red fluorescence, could bind with glioma mtDNA and then inhibited the growth of human glioma cells but not that of neuronal cells, liver, or endothelial cells. RC-7 significantly reduced energy production and increased the oxidative stress in the glioma cells. Administration of RC-7 into mice not only could be observed in the glioma mass of brain by fluorescence imaging, but also obviously prevented the growth of xenograft glioma and prolonged mouse survival days. The findings suggested the theranostic application of a novel type of complex through targeting the tumor mtDNA.
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26
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Niemann J, Zehm C, Waterstradt R, Tiedge M, Baltrusch S. Cytosolic and mitochondrial Ca 2+ concentrations in primary hepatocytes change with ageing and in consequence of an mtDNA mutation. Cell Calcium 2019; 82:102055. [PMID: 31377553 DOI: 10.1016/j.ceca.2019.102055] [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: 03/25/2019] [Revised: 06/12/2019] [Accepted: 07/16/2019] [Indexed: 12/15/2022]
Abstract
Mitochondrial Ca2+ flux is crucial for the regulation of cell metabolism. Ca2+ entry to the mitochondrial matrix is mediated by VDAC1 and MCU with its regulatory molecules. We investigated hepatocytes isolated from conplastic C57BL/6NTac-mtNODLtJ mice (mtNOD) that differ from C57BL/6NTac mice (controls) by a point mutation in mitochondrial-encoded subunit 3 of cytochrome c oxidase, resulting in functional and morphological mitochondrial adaptations. Mice of both strains up to 12 months old were compared using mitochondrial GEM-GECO1 and cytosolic CAR-GECO1 expression to gain knowledge of age-dependent alterations of Ca2+ concentrations. In controls we observed a significant increase in glucose-induced cytosolic Ca2+ concentration with ageing, but only a minor elevation in mitochondrial Ca2+ concentration. Conversely, glucose-induced mitochondrial Ca2+ concentration significantly declined with ageing in mtNOD mice, paralleled by a slight decrease in cytosolic Ca2+ concentration. This was consistent with a significant reduction of the MICU1 to MCU expression ratio and a decline in MCUR1. Our results can best be explained in terms of the adaptation of Ca2+ concentrations to the mitochondrial network structure. In the fragmented mitochondrial network of ageing controls there is a need for high cytosolic Ca2+ influx, because only some of the isolated mitochondria are in direct contact with the endoplasmic reticulum. This is not important in the hyper-fused elongated mitochondrial network found in ageing mtNOD mice which facilitates rapid Ca2+ distribution over a large mitochondrial area.
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Affiliation(s)
- Jan Niemann
- Institute of Medical Biochemistry and Molecular Biology, University Medicine, University of Rostock, Rostock, Germany
| | - Cindy Zehm
- Institute of Medical Biochemistry and Molecular Biology, University Medicine, University of Rostock, Rostock, Germany
| | - Rica Waterstradt
- Institute of Medical Biochemistry and Molecular Biology, University Medicine, University of Rostock, Rostock, Germany
| | - Markus Tiedge
- Institute of Medical Biochemistry and Molecular Biology, University Medicine, University of Rostock, Rostock, Germany
| | - Simone Baltrusch
- Institute of Medical Biochemistry and Molecular Biology, University Medicine, University of Rostock, Rostock, Germany.
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27
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Nesti C, Rubegni A, Tolomeo D, Baldacci J, Cassandrini D, D'Amore F, Santorelli FM. Complex multisystem phenotype associated with the mitochondrial DNA m.5522G>A mutation. Neurol Sci 2019; 40:1705-1708. [PMID: 30937556 DOI: 10.1007/s10072-019-03864-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 12/17/2018] [Accepted: 03/21/2019] [Indexed: 02/07/2023]
Abstract
Mitochondrial tRNAs are responsible for more than half of pathogenic point mutations in the mitochondrial genome (mtDNA). Different mutations give rise to widely differing phenotypes, ranging from isolated organ-specific diseases to multisystem conditions. Herein, we report a 40-year-old woman presenting with a complex multisystem phenotype including sensorineural hearing loss, retinopathy, severe dilated cardiomyopathy, non-insulin dependent diabetes mellitus, and renal failure. Sequence analysis of mtDNA identified the m.5522G>A mutation in MT-TW, the gene encoding mitochondrial tRNA for tryptophan. The heteroplasmic variant, thus far described once, was almost exclusively confined to skeletal muscle tissue, as shown by massive parallel sequencing and corroborated by an ad hoc designed PCR-based strategy. This patient, presenting a severe, multisystem involvement apparently sparing the brain, contributes to the genetic heterogeneity of mitochondrial diseases caused by mutations in mitochondrial tRNAs.
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Affiliation(s)
- Claudia Nesti
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Stella Maris Foundation, via dei Giacinti 2, 56128, Pisa, Italy.
| | - Anna Rubegni
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Stella Maris Foundation, via dei Giacinti 2, 56128, Pisa, Italy
| | - Deborah Tolomeo
- Department of Clinical and Experimental Medicine, University of Pisa, via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - Jacopo Baldacci
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Stella Maris Foundation, via dei Giacinti 2, 56128, Pisa, Italy
| | - Denise Cassandrini
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Stella Maris Foundation, via dei Giacinti 2, 56128, Pisa, Italy
| | - Francesca D'Amore
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Stella Maris Foundation, via dei Giacinti 2, 56128, Pisa, Italy
| | - Filippo M Santorelli
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Stella Maris Foundation, via dei Giacinti 2, 56128, Pisa, Italy.
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28
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Li L, Wu CS, Hou GM, Dong MZ, Wang ZB, Hou Y, Schatten H, Zhang GR, Sun QY. Type 2 diabetes increases oocyte mtDNA mutations which are eliminated in the offspring by bottleneck effect. Reprod Biol Endocrinol 2018; 16:110. [PMID: 30390692 PMCID: PMC6215660 DOI: 10.1186/s12958-018-0423-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/14/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Diabetes induces many complications including reduced fertility and low oocyte quality, but whether it causes increased mtDNA mutations is unknown. METHODS We generated a T2D mouse model by using high-fat-diet (HFD) and Streptozotocin (STZ) injection. We examined mtDNA mutations in oocytes of diabetic mice by high-throughput sequencing techniques. RESULTS T2D mice showed glucose intolerance, insulin resistance, low fecundity compared to the control group. T2D oocytes showed increased mtDNA mutation sites and mutation numbers compared to the control counterparts. mtDNA mutation examination in F1 mice showed that the mitochondrial bottleneck could eliminate mtDNA mutations. CONCLUSIONS T2D mice have increased mtDNA mutation sites and mtDNA mutation numbers in oocytes compared to the counterparts, while these adverse effects can be eliminated by the bottleneck effect in their offspring. This is the first study using a small number of oocytes to examine mtDNA mutations in diabetic mothers and offspring.
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Affiliation(s)
- Li Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Chang-Sheng Wu
- Peking Medriv Academy of Genetics and Reproduction, Beijing, 102629, China
| | - Guan-Mei Hou
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- College of Life Science, Qingdao Agricultural University, Qingdao, 266109, China
| | - Ming-Zhe Dong
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Zhen-Bo Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Yi Hou
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Heide Schatten
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, 65211, USA
| | - Gui-Rong Zhang
- Peking Medriv Academy of Genetics and Reproduction, Beijing, 102629, China.
| | - Qing-Yuan Sun
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.
- University of Chinese Academy of Sciences, Beijing, 100101, China.
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29
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Ryzhkova AI, Sazonova MA, Sinyov VV, Galitsyna EV, Chicheva MM, Melnichenko AA, Grechko AV, Postnov AY, Orekhov AN, Shkurat TP. Mitochondrial diseases caused by mtDNA mutations: a mini-review. Ther Clin Risk Manag 2018; 14:1933-1942. [PMID: 30349272 PMCID: PMC6186303 DOI: 10.2147/tcrm.s154863] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
There are several types of mitochondrial cytopathies, which cause a set of disorders, arise as a result of mitochondria’s failure. Mitochondria’s functional disruption leads to development of physical, growing and cognitive disabilities and includes multiple organ pathologies, essentially disturbing the nervous and muscular systems. The origins of mitochondrial cytopathies are mutations in genes of nuclear DNA encoding mitochondrial proteins or in mitochondrial DNA. Nowadays, numerous mtDNA mutations significant to the appearance and progress of pathologies in humans are detected. In this mini-review, we accent on the mitochondrial cytopathies related to mutations of mtDNA. As well known, there are definite set of symptoms of mitochondrial cytopathies distinguishing or similar for different syndromes. The present article contains data about mutations linked with cytopathies that facilitate diagnosis of different syndromes by using genetic analysis methods. In addition, for every individual, more effective therapeutic approach could be developed after wide-range mutant background analysis of mitochondrial genome.
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Affiliation(s)
- Anastasia I Ryzhkova
- Laboratory of Medical Genetics, National Medical Research Center of Cardiology, Moscow, Russian Federation, .,Department of Virology, K.I. Skryabin Moscow State Academy of Veterinary Medicine and Biotechnology-MVA, Moscow, Russian Federation,
| | - Margarita A Sazonova
- Laboratory of Medical Genetics, National Medical Research Center of Cardiology, Moscow, Russian Federation, .,Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Moscow, Russian Federation
| | - Vasily V Sinyov
- Laboratory of Medical Genetics, National Medical Research Center of Cardiology, Moscow, Russian Federation,
| | - Elena V Galitsyna
- Department of Genetics, Southern Federal University, Rostov-on-Don, Russian Federation
| | - Mariya M Chicheva
- Department of Genetics, Southern Federal University, Rostov-on-Don, Russian Federation
| | | | - Andrey V Grechko
- Federal Research and Clinical Center of Reanimatology and Rehabilitology, Moscow, Russian Federation
| | - Anton Yu Postnov
- Laboratory of Medical Genetics, National Medical Research Center of Cardiology, Moscow, Russian Federation,
| | - Alexander N Orekhov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Moscow, Russian Federation.,Institute for Atherosclerosis Research, Skolkovo Innovative Centre, Moscow Region, Russian Federation
| | - Tatiana P Shkurat
- Department of Genetics, Southern Federal University, Rostov-on-Don, Russian Federation
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30
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Feng J, Zhang Q, Li C, Zhou Y, Zhao S, Hong L, Song Q, Yu S, Hu C, Wang H, Mao C, Shepard MJ, Hao S, Dominah G, Sun M, Wan H, Park DM, Gilbert MR, Xu G, Zhuang Z, Zhang Y. Enhancement of mitochondrial biogenesis and paradoxical inhibition of lactate dehydrogenase mediated by 14-3-3η in oncocytomas. J Pathol 2018; 245:361-372. [PMID: 29704241 DOI: 10.1002/path.5090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 11/19/2017] [Revised: 03/22/2018] [Accepted: 04/23/2018] [Indexed: 12/11/2022]
Abstract
Oncocytomas represent a subset of benign pituitary adenomas that are characterized by significant mitochondrial hyperplasia. Mitochondria are key organelles for energy generation and metabolic intermediate production for biosynthesis in tumour cells, so understanding the mechanism underlying mitochondrial biogenesis and its impact on cellular metabolism in oncocytoma is vital. Here, we studied surgically resected pituitary oncocytomas by using multi-omic analyses. Whole-exome sequencing did not reveal any nuclear mutations, but identified several somatic mutations of mitochondrial DNA, and dysfunctional respiratory complex I. Metabolomic analysis suggested that oxidative phosphorylation was reduced within individual mitochondria, and that there was no reciprocal increase in glycolytic activity. Interestingly, we found a reduction in the cellular lactate level and reduced expression of lactate dehydrogenase A (LDHA), which contributed to mitochondrial biogenesis in an in vitro cell model. It is of note that the hypoxia-response signalling pathway was not upregulated in pituitary oncocytomas, thereby failing to enhance glycolysis. Proteomic analysis showed that 14-3-3η was exclusively overexpressed in oncocytomas, and that 14-3-3η was capable of inhibiting glycolysis, leading to mitochondrial biogenesis in the presence of rotenone. In particular, 14-3-3η inhibited LDHA by direct interaction in the setting of complex I dysfunction, highlighting the role of 14-3-3η overexpression and inefficient oxidative phosphorylation in oncocytoma mitochondrial biogenesis. These findings deepen our understanding of the metabolic changes that occur within oncocytomas, and shine a light on the mechanism of mitochondrial biogenesis, providing a novel perspective on metabolic adaptation in tumour cells. © 2018 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
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Affiliation(s)
- Jie Feng
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China.,Beijing Tiantan Hospital, Capital Medical University, Beijing, PR China
| | - Qi Zhang
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.,Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.,Department of Hepatobiliary and Pancreatic Surgery, the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, PR China
| | - Chuzhong Li
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China.,Beijing Tiantan Hospital, Capital Medical University, Beijing, PR China
| | - Yang Zhou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, PR China.,University of Chinese Academy of Sciences, Beijing, PR China
| | - Sida Zhao
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China
| | - Lichuan Hong
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China
| | - Qi Song
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.,Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, PR China
| | - Shenyuan Yu
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China
| | - Chunxiu Hu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, PR China.,University of Chinese Academy of Sciences, Beijing, PR China
| | - Herui Wang
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Chengyuan Mao
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Matthew J Shepard
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.,Department of Neurological Surgery, University of Virginia, Charlottesville, VA, USA
| | - Shuyu Hao
- Beijing Tiantan Hospital, Capital Medical University, Beijing, PR China
| | - Gifty Dominah
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Mitchell Sun
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Hong Wan
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China.,Beijing Tiantan Hospital, Capital Medical University, Beijing, PR China
| | - Deric M Park
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Mark R Gilbert
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, PR China.,University of Chinese Academy of Sciences, Beijing, PR China
| | - Zhengping Zhuang
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.,Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Yazhuo Zhang
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, PR China.,Beijing Tiantan Hospital, Capital Medical University, Beijing, PR China.,Beijing Institute for Brain Disorders Brain Tumor Center, Capital Medical University, Beijing, PR China.,China National Clinical Research Centre for Neurological Diseases, Beijing, PR China
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Iommarini L, Ghelli A, Tropeano CV, Kurelac I, Leone G, Vidoni S, Lombes A, Zeviani M, Gasparre G, Porcelli AM. Unravelling the Effects of the Mutation m.3571insC/MT-ND1 on Respiratory Complexes Structural Organization. Int J Mol Sci 2018. [PMID: 29518970 PMCID: PMC5877625 DOI: 10.3390/ijms19030764] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Mammalian respiratory complex I (CI) biogenesis requires both nuclear and mitochondria-encoded proteins and is mostly organized in respiratory supercomplexes. Among the CI proteins encoded by the mitochondrial DNA, NADH-ubiquinone oxidoreductase chain 1 (ND1) is a core subunit, evolutionary conserved from bacteria to mammals. Recently, ND1 has been recognized as a pivotal subunit in maintaining the structural and functional interaction among the hydrophilic and hydrophobic CI arms. A critical role of human ND1 both in CI biogenesis and in the dynamic organization of supercomplexes has been depicted, although the proof of concept is still missing and the critical amount of ND1 protein necessary for a proper assembly of both CI and supercomplexes is not defined. By exploiting a unique model in which human ND1 is allotopically re-expressed in cells lacking the endogenous protein, we demonstrated that the lack of this protein induces a stall in the multi-step process of CI biogenesis, as well as the alteration of supramolecular organization of respiratory complexes. We also defined a mutation threshold for the m.3571insC truncative mutation in mitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 1 (MT-ND1), below which CI and its supramolecular organization is recovered, strengthening the notion that a certain amount of human ND1 is required for CI and supercomplexes biogenesis.
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Affiliation(s)
- Luisa Iommarini
- Dipartimento di Farmacia e Biotecnologie (FABIT), Università di Bologna, Via Francesco Selmi 3, 40126 Bologna, Italy.
| | - Anna Ghelli
- Dipartimento di Farmacia e Biotecnologie (FABIT), Università di Bologna, Via Francesco Selmi 3, 40126 Bologna, Italy.
| | - Concetta Valentina Tropeano
- Dipartimento di Farmacia e Biotecnologie (FABIT), Università di Bologna, Via Francesco Selmi 3, 40126 Bologna, Italy.
| | - Ivana Kurelac
- Dipartimento Scienze Mediche e Chirurgiche (DIMEC), U.O. Genetica Medica, Pol. Universitario S. Orsola-Malpighi, Università di Bologna, via Massarenti 9, 40138 Bologna, Italy.
| | - Giulia Leone
- Dipartimento di Farmacia e Biotecnologie (FABIT), Università di Bologna, Via Francesco Selmi 3, 40126 Bologna, Italy.
| | - Sara Vidoni
- Medical Research Council, Mitochondrial Biology Unit, Cambridge CB2 0XY, UK.
| | - Anne Lombes
- Inserm U1016, Institut Cochin, F-75014 Paris, France.
| | - Massimo Zeviani
- Medical Research Council, Mitochondrial Biology Unit, Cambridge CB2 0XY, UK.
| | - Giuseppe Gasparre
- Dipartimento Scienze Mediche e Chirurgiche (DIMEC), U.O. Genetica Medica, Pol. Universitario S. Orsola-Malpighi, Università di Bologna, via Massarenti 9, 40138 Bologna, Italy.
| | - Anna Maria Porcelli
- Dipartimento di Farmacia e Biotecnologie (FABIT), Università di Bologna, Via Francesco Selmi 3, 40126 Bologna, Italy.
- Centro Interdipartimentale di Ricerca Industriale Scienze della Vita e Tecnologie per la Salute, Università di Bologna, 40100 Bologna, Italy.
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Kürschner G, Zhang Q, Clima R, Xiao Y, Busch JF, Kilic E, Jung K, Berndt N, Bulik S, Holzhütter HG, Gasparre G, Attimonelli M, Babu M, Meierhofer D. Renal oncocytoma characterized by the defective complex I of the respiratory chain boosts the synthesis of the ROS scavenger glutathione. Oncotarget 2017; 8:105882-105904. [PMID: 29285300 PMCID: PMC5739687 DOI: 10.18632/oncotarget.22413] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 09/21/2017] [Indexed: 12/15/2022] Open
Abstract
Renal oncocytomas are rare benign tumors of the kidney and characterized by a deficient complex I (CI) enzyme activity of the oxidative phosphorylation (OXPHOS) system caused by mitochondrial DNA (mtDNA) mutations. Yet, little is known about the underlying molecular mechanisms and alterations of metabolic pathways in this tumor. We compared renal oncocytomas with adjacent matched normal kidney tissues on a global scale by multi-omics approaches, including whole exome sequencing (WES), proteomics, metabolomics, and metabolic pathway simulation. The abundance of proteins localized to mitochondria increased more than 2-fold, the only exception was a strong decrease in the abundance for CI subunits that revealed several pathogenic heteroplasmic mtDNA mutations by WES. We also observed renal oncocytomas to dysregulate main metabolic pathways, shunting away from gluconeogenesis and lipid metabolism. Nevertheless, the abundance of energy carrier molecules such as NAD+, NADH, NADP, ATP, and ADP were significantly higher in renal oncocytomas. Finally, a substantial 5000-fold increase of the reactive oxygen species scavenger glutathione can be regarded as a new hallmark of renal oncocytoma. Our findings demonstrate that renal oncocytomas undergo a metabolic switch to eliminate ATP consuming processes to ensure a sufficient energy supply for the tumor.
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Affiliation(s)
- Gerrit Kürschner
- Max Planck Institute for Molecular Genetics, Mass Spectrometry Facility, Berlin, Germany.,Technical University of Berlin, Institute of Bioanalytics, Department of Biotechnology, Berlin, Germany
| | - Qingzhou Zhang
- University of Regina, Department of Biochemistry, Regina, Canada
| | - Rosanna Clima
- University of Bari, Department of Biosciences, Biotechnology and Biopharmaceutics, Bari, Italy.,Department of Medical and Surgical Sciences-DIMEC, Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Yi Xiao
- Max Planck Institute for Molecular Genetics, Mass Spectrometry Facility, Berlin, Germany.,Freie Universität Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany
| | | | - Ergin Kilic
- University Hospital Charité, Institute of Pathology, Berlin, Germany
| | - Klaus Jung
- University Hospital Charité, Department of Urology, Berlin, Germany.,Berlin Institute for Urologic Research, Berlin, Germany
| | - Nikolaus Berndt
- Charité University Medicine Berlin, Institute of Biochemistry Computational Systems Biochemistry Group, Berlin, Germany
| | - Sascha Bulik
- Charité University Medicine Berlin, Institute of Biochemistry Computational Systems Biochemistry Group, Berlin, Germany
| | - Hermann-Georg Holzhütter
- Charité University Medicine Berlin, Institute of Biochemistry Computational Systems Biochemistry Group, Berlin, Germany
| | - Giuseppe Gasparre
- Department of Medical and Surgical Sciences-DIMEC, Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Marcella Attimonelli
- University of Bari, Department of Biosciences, Biotechnology and Biopharmaceutics, Bari, Italy
| | - Mohan Babu
- University of Regina, Department of Biochemistry, Regina, Canada
| | - David Meierhofer
- Max Planck Institute for Molecular Genetics, Mass Spectrometry Facility, Berlin, Germany
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Jeppesen TD, Al-Hashimi N, Duno M, Wibrand F, Andersen G, Vissing J. Mitochondrial DNA mutation load in a family with the m.8344A>G point mutation and lipomas: a case study. Clin Case Rep 2017; 5:2034-2039. [PMID: 29225851 PMCID: PMC5715413 DOI: 10.1002/ccr3.1096] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 06/16/2017] [Accepted: 06/21/2017] [Indexed: 11/12/2022] Open
Abstract
Studies have shown that difference in mtDNA mutation load among tissues is a result of postnatal modification. We present five family members with the m.8344A>G with variable phenotypes but uniform intrapersonal distribution of mutation load, indicating that there is no postnatal modification of mtDNA mutation load in this genotype.
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Affiliation(s)
- Tina Dysgaard Jeppesen
- Copenhagen Neuromuscular Clinic Rigshospitalet University of Copenhagen Copenhagen Denmark
| | - Noor Al-Hashimi
- Copenhagen Neuromuscular Clinic Rigshospitalet University of Copenhagen Copenhagen Denmark
| | - Morten Duno
- Department of Clinical Genetics Rigshospitalet University of Copenhagen Copenhagen Denmark
| | - Flemming Wibrand
- Department of Clinical Genetics Rigshospitalet University of Copenhagen Copenhagen Denmark
| | - Grete Andersen
- Copenhagen Neuromuscular Clinic Rigshospitalet University of Copenhagen Copenhagen Denmark
| | - John Vissing
- Copenhagen Neuromuscular Clinic Rigshospitalet University of Copenhagen Copenhagen Denmark
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Abstract
The aim of the present review was to summarize and discuss previous findings concerning renal manifestations of primary mitochondrial disorders (MIDs). A literature review was performed using frequently used databases. The study identified that primary MIDs frequently present as mitochondrial multiorgan disorder syndrome (MIMODS) at onset or in the later course of the MID. Occasionally, the kidneys are affected in MIDs. Renal manifestations of MIDs include renal insufficiency, nephrolithiasis, nephrotic syndrome, renal cysts, renal tubular acidosis, Bartter-like syndrome, Fanconi syndrome, focal segmental glomerulosclerosis, tubulointerstitial nephritis, nephrocalcinosis, and benign or malign neoplasms. Among the syndromic MIDs, renal involvement has been most frequently reported in patients with mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes syndrome, Kearns-Sayre syndrome, Leigh syndrome and mitochondrial depletion syndromes. Only in single cases was renal involvement also reported in chronic progressive external ophthalmoplegia, Pearson syndrome, Leber's hereditary optic neuropathy, coenzyme-Q deficiency, X-linked sideroblastic anemia and ataxia, myopathy, lactic acidosis, and sideroblastic anemia, pyruvate dehydrogenase deficiency, growth retardation, aminoaciduria, cholestasis, iron overload, lactacidosis, and early death, and hyperuricemia, pulmonary hypertension, renal failure in infancy and alkalosis syndrome. The present study proposes that the frequency of renal involvement in MIDs is probably underestimated. Diagnosis of renal involvement follows general guidelines and treatment is symptomatic. Thus, renal manifestations of primary MIDs require recognition and appropriate management, as they determine the outcome of MID patients.
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Affiliation(s)
- Josef Finsterer
- Neurological Department, Municipal Hospital Rudolfstiftung, A-1030 Vienna, Austria
| | - Fulvio Alexandre Scorza
- Paulista de Medicina School, Federal University of São Paulo, Primeiro Andar CEP, São Paulo 04039-032, SP, Brazil
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Balasubramaniam S, Lewis B, Mock DM, Said HM, Tarailo-Graovac M, Mattman A, van Karnebeek CD, Thorburn DR, Rodenburg RJ, Christodoulou J. Leigh-Like Syndrome Due to Homoplasmic m.8993T>G Variant with Hypocitrullinemia and Unusual Biochemical Features Suggestive of Multiple Carboxylase Deficiency (MCD). JIMD Rep 2016; 33:99-107. [PMID: 27450367 DOI: 10.1007/8904_2016_559] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/01/2016] [Revised: 03/09/2016] [Accepted: 03/16/2016] [Indexed: 01/15/2023] Open
Abstract
Leigh syndrome (LS), or subacute necrotizing encephalomyelopathy, is a genetically heterogeneous, relentlessly progressive, devastating neurodegenerative disorder that usually presents in infancy or early childhood. A diagnosis of Leigh-like syndrome may be considered in individuals who do not fulfil the stringent diagnostic criteria but have features resembling Leigh syndrome.We describe a unique presentation of Leigh-like syndrome in a 3-year-old boy with elevated 3-hydroxyisovalerylcarnitine (C5-OH) on newborn screening (NBS). Subsequent persistent plasma elevations of C5-OH and propionylcarnitine (C3) as well as fluctuating urinary markers were suggestive of multiple carboxylase deficiency (MCD). Normal enzymology and mutational analysis of genes encoding holocarboxylase synthetase (HLCS) and biotinidase (BTD) excluded MCD. Biotin uptake studies were normal excluding biotin transporter deficiency. His clinical features at 13 months of age comprised psychomotor delay, central hypotonia, myopathy, failure to thrive, hypocitrullinemia, recurrent episodes of decompensation with metabolic keto-lactic acidosis and an episode of hyperammonemia. Biotin treatment from 13 months of age was associated with increased patient activity, alertness, and attainment of new developmental milestones, despite lack of biochemical improvements. Whole exome sequencing (WES) analysis failed to identify any other variants which could likely contribute to the observed phenotype, apart from the homoplasmic (100%) m.8993T>G variant initially detected by mitochondrial DNA (mtDNA) sequencing.Hypocitrullinemia has been reported in patients with the m.8993T>G variant and other mitochondrial disorders. However, persistent plasma elevations of C3 and C5-OH have previously only been reported in one other patient with this homoplasmic mutation. We suggest considering the m.8993T>G variant early in the diagnostic evaluation of MCD-like biochemical disturbances, particularly when associated with hypocitrullinemia on NBS and subsequent confirmatory tests. An oral biotin trial is also warranted.
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Affiliation(s)
- Shanti Balasubramaniam
- Metabolic Unit, Department of Rheumatology and Metabolic Medicine, Princess Margaret Hospital, Perth, WA, Australia. .,School of Paediatrics and Child Health, University of Western Australia, Perth, WA, Australia. .,Western Sydney Genetics Program, Children's Hospital at Westmead, Westmead, NSW, Australia.
| | - B Lewis
- PathWest Laboratories WA, Princess Margaret Hospital, Perth, WA, Australia
| | - D M Mock
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - H M Said
- Department of Medicine, University of California School of Medicine Irvine, Irvine, CA, USA
| | - M Tarailo-Graovac
- Centre for Molecular Medicine, Department of Medical Genetics, Child and Family Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - A Mattman
- Adult Metabolic Diseases Clinic, Division of Endocrinology and Metabolism, Vancouver General Hospital, UBC, Vancouver, BC, Canada
| | - C D van Karnebeek
- Centre for Molecular Medicine, Department of Pediatrics, Child and Family Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - D R Thorburn
- Murdoch Childrens Research Institute and Victorian Clinical Genetics Services, Royal Children's Hospital, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia
| | - R J Rodenburg
- Radboud Center for Mitochondrial Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - J Christodoulou
- Murdoch Childrens Research Institute and Victorian Clinical Genetics Services, Royal Children's Hospital, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia
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Yen HC, Liu YC, Kan CC, Wei HJ, Lee SH, Wei YH, Feng YH, Chen CW, Huang CC. Disruption of the human COQ5-containing protein complex is associated with diminished coenzyme Q10 levels under two different conditions of mitochondrial energy deficiency. Biochim Biophys Acta Gen Subj 2016; 1860:1864-76. [PMID: 27155576 DOI: 10.1016/j.bbagen.2016.05.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 01/27/2016] [Revised: 04/25/2016] [Accepted: 05/03/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND The Coq protein complex assembled from several Coq proteins is critical for coenzyme Q6 (CoQ6) biosynthesis in yeast. Secondary CoQ10 deficiency is associated with mitochondrial DNA (mtDNA) mutations in patients. We previously demonstrated that carbonyl cyanide-p-trifluoromethoxyphenylhydrazone (FCCP) suppressed CoQ10 levels and COQ5 protein maturation in human 143B cells. METHODS This study explored the putative COQ protein complex in human cells through two-dimensional blue native-polyacrylamide gel electrophoresis and Western blotting to investigate its status in 143B cells after FCCP treatment and in cybrids harboring the mtDNA mutation that caused myoclonic epilepsy with ragged-red fibers (MERRF) syndrome. Ubiquinol-10 and ubiquinone-10 levels were detected by high-performance liquid chromatography. Mitochondrial energy status, mRNA levels of various PDSS and COQ genes, and protein levels of COQ5 and COQ9 in cybrids were examined. RESULTS A high-molecular-weight protein complex containing COQ5, but not COQ9, in the mitochondria was identified and its level was suppressed by FCCP and in cybrids with MERRF mutation. That was associated with decreased mitochondrial membrane potential and mitochondrial ATP production. Total CoQ10 levels were decreased under both conditions, but the ubiquinol-10:ubiquinone-10 ratio was increased in mutant cybrids. The expression of COQ5 was increased but COQ5 protein maturation was suppressed in the mutant cybrids. CONCLUSIONS A novel COQ5-containing protein complex was discovered in human cells. Its destabilization was associated with reduced CoQ10 levels and mitochondrial energy deficiency in human cells treated with FCCP or exhibiting MERRF mutation. GENERAL SIGNIFICANCE The findings elucidate a possible mechanism for mitochondrial dysfunction-induced CoQ10 deficiency in human cells.
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Affiliation(s)
- Hsiu-Chuan Yen
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan; Department of Nephrology, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
| | - Yi-Chun Liu
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chia-Chi Kan
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Hsing-Ju Wei
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Szu-Hsien Lee
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yau-Huei Wei
- Department of Biochemistry and Molecular Biology, School of Life Sciences, National Yang Ming University, Taipei, Taiwan; Department of Medicine, Mackay Medical College, New Taipei City, Taiwan
| | - Yu-Hsiu Feng
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chih-Wei Chen
- Graduate Institute and Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chin-Chang Huang
- College of Medicine, Chang Gung University and Department of Neurology, Chang Gung Memorial Hospital, Taoyuan, Taiwan
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Niedzwiecka K, Kabala AM, Lasserre JP, Tribouillard-Tanvier D, Golik P, Dautant A, di Rago JP, Kucharczyk R. Yeast models of mutations in the mitochondrial ATP6 gene found in human cancer cells. Mitochondrion 2016; 29:7-17. [PMID: 27083309 DOI: 10.1016/j.mito.2016.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 04/08/2016] [Accepted: 04/08/2016] [Indexed: 01/09/2023]
Abstract
Since the discovery of somatic mtDNA mutations in tumor cells, multiple studies have focused on establishing a causal relationship between those changes and alterations in energy metabolism, a hallmark of cancer cells. Yet the consequences of these mutations on mitochondrial function remain largely unknown. In this study, Saccharomyces cerevisiae has been used as a model to investigate the functional consequences of four cancer-associated missense mutations (8914C>A, 8932C>T, 8953A>G, 9131T>C) found in the mitochondrial MT-ATP6 gene. This gene encodes the a-subunit of F1FO-ATP synthase, which catalyzes the last steps of ATP production in mitochondria. Although the four studied mutations affected well-conserved residues of the a-subunit, only one of them (8932C>T) had a significant impact on mitochondrial function, due to a less efficient incorporation of the a-subunit into ATP synthase. Our findings indicate that these ATP6 genetic variants found in human tumors are neutral mitochondrial genome substitutions with a limited, if any, impact on the energetic function of mitochondria.
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Affiliation(s)
- Katarzyna Niedzwiecka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Anna Magdalena Kabala
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland; Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université de Bordeaux, 1 rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
| | - Jean-Paul Lasserre
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université de Bordeaux, 1 rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
| | - Déborah Tribouillard-Tanvier
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université de Bordeaux, 1 rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
| | - Pawel Golik
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland; Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, Poland
| | - Alain Dautant
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université de Bordeaux, 1 rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
| | - Jean-Paul di Rago
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université de Bordeaux, 1 rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
| | - Roza Kucharczyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland.
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Lasisi AO, Bademci G, Foster J 2nd, Blanton S, Tekin M. Common genes for non-syndromic deafness are uncommon in sub-Saharan Africa: a report from Nigeria. Int J Pediatr Otorhinolaryngol 2014; 78:1870-3. [PMID: 25218342 DOI: 10.1016/j.ijporl.2014.08.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 08/10/2014] [Accepted: 08/11/2014] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Little is known about the molecular epidemiology of deafness in sub-Saharan Africa (SSA). Even in Nigeria, the most populous African nation, no genetic studies of deafness have been conducted. This pioneering work aims at investigating the frequencies of gene mutations relatively common in other parts of the world (i.e. those in GJB2, GJB6, and mitochondrial DNA) among subjects from Nigeria with hearing loss (HL) with no evidence of acquired pathology or syndromic findings. In addition, we review the literature on the genetics of deafness in SSA. METHOD We evaluated 81 unrelated deaf probands from the Yoruba tribe residing in Ibadan, a suburban city in Nigeria, for the aetiology of their deafness. Subjects underwent genetic testing if their history was negative for an environmental cause and physical examination did not find evidence of a syndrome. Both exons of GJB2 and mitochondrial DNA flanking the 1555A>G mutations were PCR-amplified followed by Sanger sequencing. GJB6 deletions were screened via quantitative PCR. RESULT We identified 44 probands who had nonsyndromic deafness with no environmental cause. The age at study time ranged between 8 months and 45 years (mean=24 years) and age at onset was congenital or prelingual (<age 2 years) in 37 (84%) probands and postlingual in 7 (16%) probands. Among these, 35 probands were the only affected members of their families (simplex cases), while there were at least two affected family members in nine cases (multiplex). Molecular analyses did not show a pathogenic variant in any one of the 44 probands studied. CONCLUSION GJB2, GJB6 and mitochondrial DNA 1555A>G mutations were not found among this initial cohort of the deaf in Nigeria. This makes imperative the search for other genes in the aetiology of HL in this population.
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Kabala AM, Lasserre JP, Ackerman SH, di Rago JP, Kucharczyk R. Defining the impact on yeast ATP synthase of two pathogenic human mitochondrial DNA mutations, T9185C and T9191C. Biochimie 2013; 100:200-6. [PMID: 24316278 DOI: 10.1016/j.biochi.2013.11.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 11/25/2013] [Indexed: 12/18/2022]
Abstract
Mutations in the human mitochondrial ATP6 gene encoding ATP synthase subunit a/6 (referred to as Atp6p in yeast) are at the base of neurodegenerative disorders like Neurogenic Ataxia and Retinitis Pigmentosa (NARP), Leigh syndrome (LS), Charcot-Marie-Tooth (CMT), and ataxia telangiectasia. In previous studies, using the yeast Saccharomyces cerevisiae as a model we were able to better define how several of these mutations impact the ATP synthase. Here we report the construction of yeast models of two other ATP6 pathogenic mutations, T9185C and T9191C. The first one was reported as conferring a mild, sometimes reversible, CMT clinical phenotype; the second one has been described in a patient presenting with severe LS. We found that an equivalent of the T9185C mutation partially impaired the functioning of yeast ATP synthase, with only a 30% deficit in mitochondrial ATP production. An equivalent of the mutation T9191C had much more severe effects, with a nearly complete block in yeast Atp6p assembly and an >95% drop in the rate of ATP synthesis. These findings provide a molecular basis for the relative severities of the diseases induced by T9185C and T9191C.
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Affiliation(s)
- Anna Magdalena Kabala
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland; Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université Bordeaux Segalen, 1 Rue Camille Saint-Saëns, Bordeaux 33077 cedex, France
| | - Jean-Paul Lasserre
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université Bordeaux Segalen, 1 Rue Camille Saint-Saëns, Bordeaux 33077 cedex, France
| | - Sharon H Ackerman
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Jean-Paul di Rago
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, Université Bordeaux Segalen, 1 Rue Camille Saint-Saëns, Bordeaux 33077 cedex, France
| | - Roza Kucharczyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland.
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Wang CH, Wu SB, Wu YT, Wei YH. Oxidative stress response elicited by mitochondrial dysfunction: implication in the pathophysiology of aging. Exp Biol Med (Maywood) 2013; 238:450-60. [PMID: 23856898 DOI: 10.1177/1535370213493069] [Citation(s) in RCA: 222] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Under normal physiological conditions, reactive oxygen species (ROS) serve as 'redox messengers' in the regulation of intracellular signalling, whereas excess ROS may induce irreversible damage to cellular components and lead to cell death by promoting the intrinsic apoptotic pathway through mitochondria. In the aging process, accumulation of mitochondria DNA mutations, impairment of oxidative phosphorylation as well as an imbalance in the expression of antioxidant enzymes result in further overproduction of ROS. This mitochondrial dysfunction-elicited ROS production axis forms a vicious cycle, which is the basis of mitochondrial free radical theory of aging. In addition, several lines of evidence have emerged recently to demonstrate that ROS play crucial roles in the regulation of cellular metabolism, antioxidant defence and posttranslational modification of proteins. We first discuss the oxidative stress responses, including metabolites redistribution and alteration of the acetylation status of proteins, in human cells with mitochondrial dysfunction and in aging. On the other hand, autophagy and mitophagy eliminate defective mitochondria and serve as a scavenger and apoptosis defender of cells in response to oxidative stress during aging. These scenarios mediate the restoration or adaptation of cells to respond to aging and age-related disorders for survival. In the natural course of aging, the homeostasis in the network of oxidative stress responses is disturbed by a progressive increase in the intracellular level of the ROS generated by defective mitochondria. Caloric restriction, which is generally thought to promote longevity, has been reported to enhance the efficiency of this network and provide multiple benefits to tissue cells. In this review, we emphasize the positive and integrative roles of mild oxidative stress elicited by mitochondria in the regulation of adaptation, anti-aging and scavenging pathway beyond their roles in the vicious cycle of mitochondrial dysfunction in the aging process.
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Affiliation(s)
- Chih-Hao Wang
- Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei 112, Taiwan
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