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Ali F, Ali S, Mohamed S, Khan I, Khan I, Khan S, Khan F, Alfeel AH, Higazi H. Analysis of mitochondrial DNA mutations in Pakistani population diagnosed with cardiovascular diseases. BRAZ J BIOL 2023; 84:e266924. [PMID: 36856233 DOI: 10.1590/1519-6984.266924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 11/29/2022] [Indexed: 03/02/2023] Open
Abstract
Heart and blood vessel disorders, such as coronary heart disease, brain vessel disease, rheumatic heart disease, and others, are together referred to as cardiovascular disease (CVD). In this study, we sought to determine how mitochondrial Leucine Transfer RNA genes and CVDs are related (MT-L1 and MT-L2). From CVD patients in Peshawar, a total of 27 saliva samples were taken. Leu-tRNA genes expressed by mitochondria were amplified using polymerase chain reaction after DNA was removed. Ten samples were sent for sequencing after PCR and gene cleaning. We obtained all of the sequenced results, which were subsequently aligned and evaluated against the mitochondrial revised Cambridge Reference Sequence (rCRS). However, in our sequenced samples, Leu-tRNA MT-L1 and MT-L2 genes were determined to be unaltered. Thus, it is suggested that a large population be taken into account while screening for mutations in the mitochondrial encoded Leu-tRNA MT-L1 and MT-L2 genes of cardiac patients in areas of Pakistan. Additionally, it is recommended that patients with cardiac problems should also have other mitochondrial encoded genes checked for potential mutations. This could result in the identification of genetic markers that could be used for early CVD screening in Pakistan.
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Affiliation(s)
- F Ali
- Dalian Medical University, Department of Cell Biology, Dalian, Liaoning, China
| | - S Ali
- Gulf Medical University, College of Health Sciences, Department of Medical Laboratory Sciences, Ajman, United Arab Emirates
| | - S Mohamed
- Gulf Medical University, College of Health Sciences, Department of Medical Laboratory Sciences, Ajman, United Arab Emirates
| | - I Khan
- Lanzhou University, School of Life Sciences, Department of Microbiology, Lanzhou, Gansu, China
| | - I Khan
- Khyber Medical University, Department of Microbiology, Peshawar, Pakistan
| | - S Khan
- Center for Reproductive Medicine, Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - F Khan
- Pir Mehr Ali Shah Arid Agriculture University, Department of Zoology, Rawalpindi, Pakistan
| | - A H Alfeel
- Gulf Medical University, College of Health Sciences, Department of Medical Laboratory Sciences, Ajman, United Arab Emirates
| | - H Higazi
- Gulf Medical University, College of Health Sciences, Department of Medical Laboratory Sciences, Ajman, United Arab Emirates
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2
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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] [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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3
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Asadullah, Ud Din A, Ul Ghafoor S, Akbar F, Akhtar N, Fiaz Khan M, Ullah Z, Kareem A. Analysis of mutations in leu tRNA gene in patients of heart diseases. Saudi J Biol Sci 2022; 29:436-443. [PMID: 35002439 PMCID: PMC8716966 DOI: 10.1016/j.sjbs.2021.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/05/2021] [Accepted: 09/05/2021] [Indexed: 11/23/2022] Open
Abstract
Cardiovascular diseases (CVD) are the leading cause of death all over the world. Beside general risk factors, there are some genetic factors which lead to cardiovascular diseases. Various nuclear DNA mutation and also mitochondrial DNA mutations have been related with cardiovascular diseases. In the present study, a total of 21 samples were collected from different families residing in district Dir. DNA was extracted from buccal epithelial cells using saliva. The mitochondrial tRNA leu (MT TL1) gene was amplified by PCR and 10 samples of different families were sequenced. The sequence was aligned with revised Cambridge Reference Sequence (rCRS) accession # NC-012920.1. It is concluded that cardiovascular diseases in our subjects are not due to mutation in the mitochondrial leucine tRNA gene. However, a large population of subjects with cardiovascular diseases needs to be studied and whole mitochondrial DNA is needed to be sequenced in the subjects with CVD. This will give an idea about the probable DNA marker which can be used to prevent loses due to these diseases at a very early stages.
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Affiliation(s)
- Asadullah
- Department of Genetics, Hazara University, Mansehra, Pakistan
| | - Aziz Ud Din
- Department of Genetics, Hazara University, Mansehra, Pakistan
| | | | - Fazal Akbar
- Centre for Biotechnology and Microbiology, University of Swat, Pakistan
| | - Naveed Akhtar
- Department of Zoology, Hazara University Sub Campus, Battagram, Pakistan
| | | | - Zaib Ullah
- Department of Zoology, Hazara University Sub Campus, Battagram, Pakistan
| | - Abdul Kareem
- Department of Life Sciences, Sana'a University, Yemen
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4
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You C, Tao R, Su Q, Lu Y, Wang L, Liu S, Wang L, Wang L, Xue F, Che F. Mitochondrial DNA analyses found five novel mutations in idiopathic epilepsy patients. Mitochondrial DNA B Resour 2019; 4:2387-2391. [PMID: 33365557 PMCID: PMC7707843 DOI: 10.1080/23802359.2019.1633963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 06/15/2019] [Indexed: 11/11/2022] Open
Abstract
Epilepsy is a common and chronic neurological disease with a high degree of genetic heterogeneity. The etiology and pathogenesis of the disease have not been fully understood. Many studies suggested that there was a reciprocal relationship between mitochondrial dysfunction and epilepsy, but few studies focused on the mitochondrial genome (mtDNA) of the epilepsy patient which was extremely important for the mitochondrial function. In our study, we obtained complete mtDNA sequences of 27 idiopathic epilepsy patients and healthy people, and compared the sequence data with 30,000 GenBank sequences including 277 Han Chinese mtDNA sequences. We analyzed each variant that might be related to disease and examined the statistically significant variant in more than 300 patients and healthy people. Ultimately, we identified 27 variants which were reported to be associated with diseases, 4 rare variants (321T > G, 15973 T > C, 3897C > A, 12580 C > T), and a nonsynonymous variant (3571 C > T) which was predicted to be damaging. Although no variant was found to be significantly associated with epilepsy, our study provided a new insight into epilepsy study on an aspect of the mitochondrial genome.
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Affiliation(s)
- Cuiping You
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Rui Tao
- Department of Neurology, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Quanping Su
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Yucheng Lu
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Long Wang
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Shu Liu
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Lifen Wang
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Lijuan Wang
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
| | - Fuzhong Xue
- Department of Epidemiology and Biostatistics, School of Public Health, Shandong University, Jinan, China
| | - Fengyuan Che
- Department of Central Laboratory, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
- Department of Neurology, Linyi People’s Hospital, Shandong University, Linyi, Shandong Province, China
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5
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Pfeffer G, Povitz M. Respiratory management of patients with neuromuscular disease: current perspectives. Degener Neurol Neuromuscul Dis 2016; 6:111-118. [PMID: 30050373 PMCID: PMC6053085 DOI: 10.2147/dnnd.s87323] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Neuromuscular ventilatory weakness can be difficult to recognize because the symptoms can be nocturnal, nonspecific, or attributed to other conditions. The presence of respiratory muscle weakness suggests a number of possible heterogeneous conditions, including neurodegenerative, autoimmune, and genetic neuromuscular diseases. In some conditions, disease-modifying management exists, but in the absence of such intervention, supportive respiratory therapy can improve quality of life and survival. In this review, we discuss the differential diagnosis and diagnostic approach to chronic neuromuscular respiratory weakness. We also review the clinical assessment and management of respiratory failure in these conditions.
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Affiliation(s)
- Gerald Pfeffer
- Department of Clinical Neurosciences, .,Hotchkiss Brain Institute, University of Calgary, Calgary, AB,
| | - Marcus Povitz
- Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
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6
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Diagnosis of muscle diseases presenting with early respiratory failure. J Neurol 2014; 262:1101-14. [DOI: 10.1007/s00415-014-7526-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 10/01/2014] [Accepted: 10/01/2014] [Indexed: 12/13/2022]
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7
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Multilevel functional and structural defects induced by two pathogenic mitochondrial tRNA mutations. Biochem J 2013; 453:455-65. [PMID: 23631826 DOI: 10.1042/bj20130294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Point mutations in hmtRNAs (human mitochondrial tRNAs) can cause various disorders, such as CPEO (chronic progressive external ophthalmoplegia) and MM (mitochondrial myopathy). Mitochondrial tRNALeu, especially the UUR codon isoacceptor, is recognized as a hot spot for pathogenic mtDNA point mutations. Thus far, 40 mutations have been reported in hmtRNAsLeu. In the present paper, we describe the wide range of effects of two substitutions found in the TΨC arms of two hmtRNAsLeu isoacceptors. The G52A substitution, corresponding to the pathogenic G12315A mutation in tRNALeu(CUN), and G3283A in tRNALeu(UUR) exhibited structural changes in the outer corner of the tRNA shape as shown by RNase probing. These mutations also induced reductions in aminoacylation, 3'-end processing and base modification processes. The main effects of the A57G substitution, corresponding to mutations A12320G in tRNALeu(CUN) and A3288G in tRNALeu(UUR), were observed on the aminoacylation activity and binding to hmEF-Tu (human mitochondrial elongation factor Tu). These observations suggest that the wide range of effects may amplify the deleterious impact on mitochondrial protein synthesis in vivo. The findings also emphasize that an exact understanding of tRNA dysfunction is critical for the future development of therapies for mitochondrial diseases.
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8
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McCormick E, Place E, Falk MJ. Molecular genetic testing for mitochondrial disease: from one generation to the next. Neurotherapeutics 2013; 10:251-61. [PMID: 23269497 PMCID: PMC3625386 DOI: 10.1007/s13311-012-0174-1] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Molecular genetic diagnostic testing for mitochondrial disease has evolved continually since the first genetic basis for a clinical mitochondrial disease syndrome was identified in the late 1980s. Owing to global limitations in both knowledge and technology, few individuals, even among those with strong clinical or biochemical evidence of mitochondrial respiratory chain dysfunction, ever received a definitive molecular diagnosis prior to 2005. Clinically available genetic diagnostic testing options improved by 2006 to include sequencing and deletion analysis of an increasing number of individual nuclear genes linked to mitochondrial disease, genome-wide microarray analysis for chromosomal copy number abnormalities, and mitochondrial DNA whole genome sequence analysis. To assess the collective effect of these tests on the genetic diagnosis of suspected mitochondrial disease, we report here results from a retrospective review of the diagnostic yield in patients evaluated from 2008 to 2011 in the Mitochondrial-Genetics Diagnostic Clinic at The Children's Hospital of Philadelphia. Among 152 patients aged 6 weeks to 81 years referred for clinical evaluation of multisystem presentations concerning for suspected mitochondrial disease, a genetic etiology was established that confirmed definite mitochondrial disease in 16.4% and excluded primary mitochondrial disease in 9.2%. Substantial diagnostic challenges remain owing to the clinical difficulty and frank low yield of a priori selecting individual nuclear genes to sequence based on particular symptomatic or biochemical manifestations of suspected mitochondrial disease. These findings highlight the particular utility of massively parallel nuclear exome sequencing technologies, whose benefits and limitations are explored relative to the clinical genetic diagnostic evaluation of mitochondrial disease.
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Affiliation(s)
- Elizabeth McCormick
- />Divisions of Human Genetics and Child Development and Metabolic Disease, Department of Pediatrics, The Children’s Hospital of Philadelphia and University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104 USA
| | - Emily Place
- />Divisions of Human Genetics and Child Development and Metabolic Disease, Department of Pediatrics, The Children’s Hospital of Philadelphia and University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104 USA
- />Department of Ophthalmology, Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA USA
| | - Marni J. Falk
- />Divisions of Human Genetics and Child Development and Metabolic Disease, Department of Pediatrics, The Children’s Hospital of Philadelphia and University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104 USA
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9
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Levinger L, Serjanov D. Pathogenesis-related mutations in the T-loops of human mitochondrial tRNAs affect 3' end processing and tRNA structure. RNA Biol 2012; 9:283-91. [PMID: 22336717 PMCID: PMC3384583 DOI: 10.4161/rna.19025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Numerous mutations in the mitochondrial genome are associated with maternally transmitted diseases and syndromes that affect muscle and other high energy-demand tissues. The mitochondrial genome encodes 13 polypeptides, 2 rRNAs and 22 interspersed tRNAs via long bidirectional polycistronic primary transcripts, requiring precise excision of the tRNAs. Despite making up only ~10% of the mitochondrial genome, tRNA genes harbor most of the pathogenesis-related mutations. tRNase Z endonucleolytically removes the pre-tRNA 3' trailer. The flexible arm of tRNase Z recognizes and binds the elbow (including the T-loop) of pre-tRNA. Pathogenesis-related T-loop mutations in mitochondrial tRNAs could thus affect tRNA structure, reduce tRNase Z binding and 3' processing, and consequently slow mitochondrial protein synthesis. Here we inspect the effects of pathogenesis-related mutations in the T-loops of mitochondrial tRNAs on pre-tRNA structure and tRNase Z processing. Increases in K(M) arising from 59A > G substitutions in mitochondrial tRNA(Gly) and tRNA(Ile) accompany changes in T-loop structure, suggesting impaired substrate binding to enzyme.
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Affiliation(s)
- Louis Levinger
- York College of The City University of New York, Jamaica, NY, USA.
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10
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Souilem S, Chebel S, Mancuso M, Petrozzi L, Siciliano G, FrihAyed M, Hentati F, Amouri R. A novel mitochondrial tRNA(Ile) point mutation associated with chronic progressive external ophthalmoplegia and hyperCKemia. J Neurol Sci 2010; 300:187-90. [PMID: 20884012 DOI: 10.1016/j.jns.2010.08.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Revised: 07/30/2010] [Accepted: 08/27/2010] [Indexed: 11/24/2022]
Abstract
We have sequenced the entire mitochondrial DNA (mtDNA) from a 54-year-old man with chronic progressive external ophthalmoplegia (PEO) and hyperCKemia. Muscle biopsy showed ragged red and SDH positive/COX negative fibres, and the biochemistry was suggestive mitochondrial respiratory chain dysfunction. Analysis of mtDNA revealed a heteroplasmic m. 4308G>A mutation in the transfer RNA isoleucine gene (MT-TI gene). Our report expands the genetic heterogeneity of PEO.
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Affiliation(s)
- Sihem Souilem
- Department of Molecular Neurobiology and Neuropathology, La Rabta, National Institute of Neurology, Tunis, Tunisia.
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11
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Kolb SJ, Sutton S, Schoenberg DR. RNA processing defects associated with diseases of the motor neuron. Muscle Nerve 2010; 41:5-17. [PMID: 19697368 DOI: 10.1002/mus.21428] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Rapid progress in the discovery of motor neuron disease genes in amyotrophic lateral sclerosis, the spinal muscular atrophies, hereditary motor neuropathies, and lethal congenital contracture syndromes is providing new perspectives and insights into the molecular pathogenesis of the motor neuron. Motor neuron disease genes are often expressed throughout the body with essential functions in all cells. A survey of these functions indicates that motor neurons are uniquely sensitive to perturbations in RNA processing pathways dependent on the interaction of specific RNAs with specific RNA-binding proteins, which presumably result in aberrant formation and function of ribonucleoprotein complexes. This review provides a summary of currently recognized RNA processing defects linked to human motor neuron diseases.
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Affiliation(s)
- Stephen J Kolb
- Department of Neurology, Ohio State University Medical Center, Hamilton Hall, Room 337B, 1645 Neil Avenue, Columbus, Ohio 43210-1228, USA
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12
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Mimaki M, Hatakeyama H, Ichiyama T, Isumi H, Furukawa S, Akasaka M, Kamei A, Komaki H, Nishino I, Nonaka I, Goto YI. Different effects of novel mtDNA G3242A and G3244A base changes adjacent to a common A3243G mutation in patients with mitochondrial disorders. Mitochondrion 2009; 9:115-22. [PMID: 19460299 DOI: 10.1016/j.mito.2009.01.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2008] [Revised: 11/09/2008] [Accepted: 01/12/2009] [Indexed: 10/21/2022]
Abstract
Two novel mitochondrial DNA base changes were identified at both sides of the 3243A>G mutation, the most common mutation associated with mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS). One was a 3244G>A transition in a girl with MELAS. The other was a 3242G>A transition in a girl with a mitochondrial disorder without a MELAS phenotype. Although the two base changes were adjacent to the 3243A>G mutation, they had different effects on the clinical phenotype, muscle pathology, and respiratory chain enzyme activity. Investigations of the different effects of the 3244G>A and 3242G>A base changes may provide a better understanding of tRNA dysfunction in mitochondrial disorders.
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Affiliation(s)
- Masakazu Mimaki
- Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi, Kodaira, Tokyo, Japan
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13
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Scaglia F, Wong LJC. Human mitochondrial transfer RNAs: role of pathogenic mutation in disease. Muscle Nerve 2008; 37:150-71. [PMID: 17999409 DOI: 10.1002/mus.20917] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The human mitochondrial genome encodes 13 proteins. All are subunits of the respiratory chain complexes involved in energy metabolism. These proteins are translated by a set of 22 mitochondrial transfer RNAs (tRNAs) that are required for codon reading. Human mitochondrial tRNA genes are hotspots for pathogenic mutations and have attracted interest over the last two decades with the rapid discovery of point mutations associated with a vast array of neuromuscular disorders and diverse clinical phenotypes. In this review, we use a scoring system to determine the pathogenicity of the mutations and summarize the current knowledge of structure-function relationships of these mutant tRNAs. We also provide readers with an overview of a large variety of mechanisms by which mutations may affect the mitochondrial translation machinery and cause disease.
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Affiliation(s)
- Fernando Scaglia
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA
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14
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McFarland R, Swalwell H, Blakely EL, He L, Groen EJ, Turnbull DM, Bushby KM, Taylor RW. The m.5650G>A mitochondrial tRNAAla mutation is pathogenic and causes a phenotype of pure myopathy. Neuromuscul Disord 2007; 18:63-7. [PMID: 17825557 DOI: 10.1016/j.nmd.2007.07.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2007] [Revised: 07/02/2007] [Accepted: 07/16/2007] [Indexed: 11/21/2022]
Abstract
We report a family where a predominantly proximal myopathy has become increasingly severe with successive generations of the maternal lineage. This pure myopathy has been caused by a mutation (m.5650G>A) in the mt-tRNA(Ala) gene that has been reported only once previously in a patient with CADASIL where the phenotype was dominated by neurological complications. This report is therefore the first description of the phenotype associated solely with this mutation and confirms its pathogenicity.
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Affiliation(s)
- Robert McFarland
- Mitochondrial Research Group, School of Neurology, Neurobiology and Psychiatry, The Medical School, Framlington Place, Newcastle University, Newcastle upon Tyne, England NE2 4HH, UK.
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15
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Oldfors A, Tulinius M. Mitochondrial encephalomyopathies. HANDBOOK OF CLINICAL NEUROLOGY 2007; 86:125-165. [PMID: 18808998 DOI: 10.1016/s0072-9752(07)86006-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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16
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Shahrizaila N, Kinnear WJM, Wills AJ. Respiratory involvement in inherited primary muscle conditions. J Neurol Neurosurg Psychiatry 2006; 77:1108-15. [PMID: 16980655 PMCID: PMC2077539 DOI: 10.1136/jnnp.2005.078881] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Patients with inherited muscle disorders can develop respiratory muscle weakness leading to ventilatory failure. Predicting the extent of respiratory involvement in the different types of inherited muscle disorders is important, as it allows clinicians to impart prognostic information and offers an opportunity for early interventional management strategies. The approach to respiratory assessment in patients with muscle disorders, the current knowledge of respiratory impairment in different muscle disorders and advice on the management of respiratory complications are summarised.
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Affiliation(s)
- N Shahrizaila
- Department of Neurology, Queen's Medical Centre, Nottingham NG7 2UH, UK
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17
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Abstract
The small, maternally inherited mtDNA has turned out to be a Pandora's box of pathogenic mutations: 12 years into the era of "mitochondrial medicine," about 100 pathogenic point mutations and innumerable rearrangements have been associated with a bewildering variety of multisystemic as well as tissue-specific human diseases. After reviewing the principles of mitochondrial genetics, we compare and contrast the clinical and pathological features of disorders due to mutations in genes affecting mitochondrial protein synthesis with those of mutations in protein-coding genes. In contrast to the striking progress in our understanding of etiology, pathogenesis is only partially explained by the rules of mitochondrial genetics and remains largely terra incognita. We review recent progress in prenatal diagnosis and epidemiology. Therapy is still woefully inadequate, but a number of promising approaches are being developed.
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Affiliation(s)
- S DiMauro
- Department of Neurology, Columbia University College of Physicians & Surgeons, New York, NY 10032, USA.
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18
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Seneca S, Goemans N, Van Coster R, Givron P, Reybrouck T, Sciot R, Meulemans A, Smet J, Van Hove JLK. A mitochondrial tRNA aspartate mutation causing isolated mitochondrial myopathy. Am J Med Genet A 2005; 137:170-5. [PMID: 16059939 DOI: 10.1002/ajmg.a.30854] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Several mutations in mitochondrial transfer RNA (tRNA) genes can cause mitochondrial myopathy. We describe a young girl who presented with pronounced exercise intolerance. The anaerobic threshold and the maximal oxygen consumption were decreased. She had decreased complex I and IV enzyme activity and ragged red fibers on muscle biopsy. An A to G transition at nucleotide position 7526 in tRNA Aspartate (tRNA(Asp)) gene was heteroplasmic in several of the patient's tissues. We were unable to detect the mutation in muscle tissue from the patient's mother. This case adds a new genetic etiology for mitochondrial myopathy. It also illustrates for patients with combined deficiency of the complex I and IV enzyme activity the value of sequencing in the affected tissue muscle, and not only in blood, all mitochondrial tRNA genes including those not commonly affected, such as in this case mt tRNA(Asp).
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Affiliation(s)
- Sara Seneca
- Center of Medical Genetics, Free University Brussels, Brussels, Belgium
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19
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Abstract
Mitochondrial tRNA gene mutations, including heteroplasmic deletions that eliminate one or more tRNAs, as well as point mutations that may be either hetero- or homoplasmic, are associated with a wide spectrum of human diseases. These range from rare syndromic disorders to cases of commoner conditions such as sensorineural deafness or cardiomyopathy. The disease spectrum of mutations in a given gene, or even a single mutation, may vary, but some patterns are evident, for example the prominence of cardiomyopathy resulting from tRNAIle defects, or of MERFF-like disease from tRNALys defects. Molecular studies of many laboratories have reached a consensus on molecular mechanisms associated with these mutations. Although precise details vary, loss of translational function of the affected tRNA(s) seems to be the final outcome, whether by impaired pre-tRNA processing, half-life, base-modification or aminoacylation. However, a mechanistic understanding of the consequences of this for the assembly and function of the mitochondrial OXPHOS complexes and for the physiological functions of the affected tissues is still a distant prospect. This review presents some views of possible downstream consequences of specific tRNA deficiencies.
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Affiliation(s)
- Howard T Jacobs
- Institute of Medical Technology, Tampere University Hospital, University of Tampere, Finland.
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20
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Nishigaki Y, Tadesse S, Bonilla E, Shungu D, Hersh S, Keats BJB, Berlin CI, Goldberg MF, Vockley J, DiMauro S, Hirano M. A novel mitochondrial tRNA(Leu(UUR)) mutation in a patient with features of MERRF and Kearns-Sayre syndrome. Neuromuscul Disord 2003; 13:334-40. [PMID: 12868503 DOI: 10.1016/s0960-8966(02)00283-3] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In a patient with clinical features of both myoclonus epilepsy ragged-red fibers (MERRF) and Kearns-Sayre syndrome (KSS), we identified a novel guanine-to-adenine mitochondrial DNA (mtDNA) mutation at nucleotide 3255 (G3255A) of the tRNA(Leu(UUR)) gene. Approximately 5% of the skeletal muscle fibers had excessive mitochondria by succinate dehydrogenase histochemistry while a smaller proportion showed cytochrome c oxidase (COX) deficiency. In skeletal muscle, activities of mitochondrial respiratory chain complexes I, I + III, II + III, and IV were reduced. The G3255A transition was heteroplasmic in all tissues tested: muscle (53%), urine sediment (67%), peripheral leukocytes (22%), and cultured skin fibroblasts (< 2%). The mutation was absent in 50 control DNA samples. Single-fiber analysis revealed a higher proportion of mutation in COX-deficient RRF (94% +/- 5, n = 25) compared to COX-positive non-RRF (18% +/- 9, n = 21). The identification of yet another tRNA(Leu(UUR)) mutation reinforces the concept that this gene is a hot-spot for pathogenic mtDNA mutations.
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MESH Headings
- Adenine/metabolism
- Adult
- Animals
- Base Sequence
- DNA, Mitochondrial/metabolism
- Electron Transport Complex IV/genetics
- Electron Transport Complex IV/metabolism
- Guanine/metabolism
- Humans
- Kearns-Sayre Syndrome/genetics
- MERRF Syndrome/genetics
- Male
- Mitochondria, Muscle/metabolism
- Mitochondria, Muscle/pathology
- Molecular Sequence Data
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Skeletal/pathology
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Mutation
- Polymerase Chain Reaction
- RNA/metabolism
- RNA, Mitochondrial
- RNA, Transfer, Leu/metabolism
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Affiliation(s)
- Yutaka Nishigaki
- Department of Neurology, Columbia University College of Physicians and Surgeon, 630 West 168th Street, P&S 4-443, New York, NY 10032, USA
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21
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Bruno C, Sacco O, Santorelli FM, Assereto S, Tonoli E, Bado M, Rossi GA, Minetti C. Mitochondrial myopathy and respiratory failure associated with a new mutation in the mitochondrial transfer ribonucleic acid glutamic acid gene. J Child Neurol 2003; 18:300-3. [PMID: 12760436 DOI: 10.1177/08830738030180040401] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We report a novel T14687C mutation in the mitochondrial transfer ribonucleic acid glutamic acid gene in a 16-year-old boy with myopathy and lactic acidosis, retinopathy, and progressive respiratory failure leading to death. A muscle biopsy showed cytochrome c oxidase-negative ragged-red fibers, and biochemical analysis of the respiratory chain enzymes in muscle homogenate revealed complex I and complex IV deficiencies. The mutation, which affects the trinucleotide (TpsiC) loop, was nearly homoplasmic in the muscle DNA of the proband, but it was absent in his blood and in the blood from the asymptomatic mother, suggesting that it may have been a spontaneous somatic mutation in muscle.
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Affiliation(s)
- Claudio Bruno
- Department of Pediatrics, University of Genova, Italy.
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22
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Abstract
Since the first reports of disorders associated with mitochondrial DNA (mtDNA) defects more than a decade ago, the small mtDNA circle has been a Pandora's box of pathogenic mutations associated with human diseases. The "morbidity map" of mtDNA has gone from one point mutation and a few deletions in 1988 to more than 110 point mutations as of September, 2001. Nuclear DNA defects affecting mitochondrial function and mtDNA replication and integrity have also been identified in the past few years and more are expected. As a result, human "mitochondrial" diseases have evolved beyond the novelty diagnoses of a decade ago into an important area of medicine, and thus, the diagnostic principles of these disorders ought to be familiar to the clinician. In this article, the authors, we summarize the principles of mitochondrial genetics and discuss the common phenotypes, general diagnostic approach, and possible therapeutic venues for these fascinating disorders.
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Affiliation(s)
- Tuan H Vu
- Department of Neurology, Columbia University College of Physicians & Surgeons, New York, NY, USA
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23
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DiMauro S, Schon EA. Mitochondrial DNA mutations in human disease. AMERICAN JOURNAL OF MEDICAL GENETICS 2002; 106:18-26. [PMID: 11579421 DOI: 10.1002/ajmg.1392] [Citation(s) in RCA: 308] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The small, maternally inherited mitochondrial DNA (mtDNA) has turned out to be a Pandora's box of pathogenic mutations: 13 years into the era of "molecular mitochondrial medicine," more than 100 pathogenic point mutations and innumerable rearrangements have been associated with a striking variety of multisystemic as well as tissue-specific human diseases. After reviewing the principles of mitochondrial genetics, we consider disorders due to mutations in genes affecting mitochondrial protein synthesis and disorders due to mutations in protein-coding genes. In contrast to the remarkable progress in our understanding of etiology, pathogenesis is only partially explained by the rules of mitochondrial genetics and remains largely unclear. We review recent progress in prenatal diagnosis, epidemiology, and in the development of animal models harboring mtDNA mutations.
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Affiliation(s)
- S DiMauro
- College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
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24
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Chapter 3 Molecular Genetic Basis of the Mitochondrial Encephalomyopathies. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1877-3419(09)70062-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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25
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Abstract
The mitochondrial encephalomyopathies are a genetically heterogeneous group of disorders associated with impaired oxidative phosphorylation. Patients may exhibit a wide range of clinical symptoms and experience significant morbidity and mortality. There is currently no curative treatment. At present the majority of genetically defined mitochondrial encephalomyopathies are caused by mutations in mitochondrial DNA. The underlying molecular mechanisms and the complex relationship between genotype and phenotype in these mitochondrial DNA diseases remain only partially understood. We describe the key features of mitochondrial DNA genetics and outline some of the common disease phenotypes associated with mtDNA defects. A classification of pathogenic mitochondrial DNA point mutations which may have therapeutic implications is outlined.
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Affiliation(s)
- T Pulkes
- Muscle and Neurogenetics Sections, University Department of Clinical Neurology, Institute of Neurology, University College London, Queen Square, WC1N 3BG, London, UK
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26
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Abstract
The ubiquitous nature of mitochondria, the dual genetic control of the respiratory chain, and the peculiar rules of mitochondrial genetics contribute to explain the extraordinary clinical heterogeneity of disorders associated with defects of oxidative phosphorylation (mitochondrial encephalomyopathies). To provide a practical approach to the diagnostic challenge posed by these conditions, we critically review the following criteria: (1) clinical presentation; (2) family history; (3) laboratory data; (4) neuroradiologic patterns; (5) standardized exercise testing; (6) muscle morphology; (7) muscle biochemistry; and (8) molecular genetic screening. Judicious sequential application of these tools should provide help in recognizing patients with mitochondrial disease and define the biochemical and molecular basis of the disorder for each patient. This knowledge is indispensable for accurate genetic counseling and prenatal diagnosis and is a prerequisite for the development of rational therapies, which are still woefully inadequate.
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Affiliation(s)
- S DiMauro
- Department of Neurology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
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