1
|
Manning A, Han V, Stephens A, Wang R, Bush N, Bard M, Ramirez JM, Kalume F. Elevated susceptibility to exogenous seizure triggers and impaired interneuron excitability in a mouse model of Leigh syndrome epilepsy. Neurobiol Dis 2023; 187:106288. [PMID: 37704057 PMCID: PMC10621616 DOI: 10.1016/j.nbd.2023.106288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 08/12/2023] [Accepted: 09/10/2023] [Indexed: 09/15/2023] Open
Abstract
Mutations in the NADH dehydrogenase (ubiquinone reductase) iron‑sulfur protein 4 (NDUFS4) gene, which encodes for a key structural subunit of the OXFOS complex I (CI), lead to the most common form of mitochondrial disease in children known as Leigh syndrome (LS). As in other mitochondrial diseases, epileptic seizures constitute one of the most significant clinical features of LS. These seizures are often very difficult to treat and are a sign of poor disease prognosis. Mice with whole-body Ndufs4 KO are a well-validated model of LS; they exhibit epilepsy and several other clinical features of LS. We have previously shown that mice with Ndufs4 KO in only GABAergic interneurons (Gad2-Ndufs4-KO) reproduce the severe epilepsy phenotype observed in the global KO mice. This observation indicated that these mice represent an excellent model of LS epilepsy isolated from other clinical manifestations of the disease. To further characterize this epilepsy phenotype, we investigated seizure susceptibility to selected exogenous seizure triggers in Gad2-Ndufs4-KO mice. Then, using electrophysiology, imaging, and immunohistochemistry, we studied the cellular, physiological, and neuroanatomical consequences of Ndufs4 KO in GABAergic interneurons. Homozygous KO of Ndufs4 in GABAergic interneurons leads to a prominent susceptibility to exogenous seizure triggers, impaired interneuron excitability and interneuron loss. Finally, we found that the hippocampus and cortex participate in the generation of seizure activity in Gad2-Ndufs4-KO mice. These findings further define the LS epilepsy phenotype and provide important insights into the cellular mechanisms underlying epilepsy in LS and other mitochondrial diseases.
Collapse
Affiliation(s)
- Arena Manning
- Graduate Program in Neuroscience, University of Washington, Seattle, WA, United States of America; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America
| | - Victor Han
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America
| | - Alexa Stephens
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America
| | - Rose Wang
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America
| | - Nicholas Bush
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America
| | - Michelle Bard
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America
| | - Jan M Ramirez
- Graduate Program in Neuroscience, University of Washington, Seattle, WA, United States of America; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America; Department of Neurological Surgery, University of Washington, Seattle, WA, United States of America
| | - Franck Kalume
- Graduate Program in Neuroscience, University of Washington, Seattle, WA, United States of America; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, United States of America; Department of Neurological Surgery, University of Washington, Seattle, WA, United States of America.
| |
Collapse
|
2
|
Sumathipala D, Strømme P, Fattahi Z, Lüders T, Sheng Y, Kahrizi K, Einarsen IH, Sloan JL, Najmabadi H, van den Heuvel L, Wevers RA, Guerrero-Castillo S, Mørkrid L, Valayannopoulos V, Backe PH, Venditti CP, van Karnebeek CD, Nilsen H, Frengen E, Misceo D. ZBTB11 dysfunction: spectrum of brain abnormalities, biochemical signature and cellular consequences. Brain 2022; 145:2602-2616. [PMID: 35104841 PMCID: PMC9337812 DOI: 10.1093/brain/awac034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 12/07/2021] [Accepted: 12/20/2021] [Indexed: 11/25/2022] Open
Abstract
Bi-allelic pathogenic variants in ZBTB11 have been associated with intellectual developmental disorder, autosomal recessive 69 (MRT69; OMIM 618383). We report five patients from three families with novel, bi-allelic variants in ZBTB11. We have expanded the clinical phenotype of MRT69, documenting varied severity of atrophy affecting different brain regions and described combined malonic and methylmalonic aciduria as a biochemical manifestation. As ZBTB11 encodes for a transcriptional regulator, we performeded chromatin immunoprecipitation-sequencing targeting ZBTB11 in fibroblasts from patients and controls. Chromatin immunoprecipitation-sequencing revealed binding of wild-type ZBTB11 to promoters in 238 genes, among which genes encoding proteins involved in mitochondrial functions and RNA processing are over-represented. Mutated ZBTB11 showed reduced binding to 61 of the targeted genes, indicating that the variants act as loss of function. Most of these genes are related to mitochondrial functions. Transcriptome analysis of the patient fibroblasts revealed dysregulation of mitochondrial functions. In addition, we uncovered that reduced binding of the mutated ZBTB11 to ACSF3 leads to decreased ACSF3 transcript level, explaining combined malonic and methylmalonic aciduria. Collectively, these results expand the clinical spectrum of ZBTB11-related neurological disease and give insight into the pathophysiology in which the dysfunctional ZBTB11 affect mitochondrial functions and RNA processing contributing to the neurological and biochemical phenotypes.
Collapse
Affiliation(s)
| | | | - Zohreh Fattahi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Torben Lüders
- Department of Clinical Molecular Biology, Section of Clinical Molecular Biology (EpiGen), University of Oslo and Akershus University Hospital, Lørenskog, Norway
| | - Ying Sheng
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Ingunn Holm Einarsen
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Jennifer L Sloan
- Organic Acid Research Section, Medical Genomics and Metabolic Genetics Branch, NHGRI, NIH, Bethesda, MD, USA
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Lambert van den Heuvel
- Translational Metabolic Laboratory, Department Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ron A Wevers
- Translational Metabolic Laboratory, Department Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands,United for Metabolic Disease—UMD, The Netherlands
| | - Sergio Guerrero-Castillo
- University Children’s Research@Kinder-UKE, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Lars Mørkrid
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | | | - Paul Hoff Backe
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway,Department of Microbiology, Oslo University Hospital, Oslo, Norway
| | - Charles P Venditti
- Organic Acid Research Section, Medical Genomics and Metabolic Genetics Branch, NHGRI, NIH, Bethesda, MD, USA
| | - Clara D van Karnebeek
- Translational Metabolic Laboratory, Department Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands,United for Metabolic Disease—UMD, The Netherlands,Department of Pediatrics, Centre for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, Canada
| | - Hilde Nilsen
- Department of Clinical Molecular Biology, Section of Clinical Molecular Biology (EpiGen), University of Oslo and Akershus University Hospital, Lørenskog, Norway
| | | | - Doriana Misceo
- Correspondence to: Doriana Misceo Department of Medical Genetics Oslo University Hospital and University of Oslo Postboks 4956 Nydalen, 0424 Oslo, Norway E-mail:
| |
Collapse
|
3
|
Lausberg E, Gießelmann S, Dewulf JP, Wiame E, Holz A, Salvarinova R, van Karnebeek CD, Klemm P, Ohl K, Mull M, Braunschweig T, Weis J, Sommer CJ, Demuth S, Haase C, Stollbrink-Peschgens C, Debray FG, Libioulle C, Choukair D, Oommen PT, Borkhardt A, Surowy H, Wieczorek D, Wagner N, Meyer R, Eggermann T, Begemann M, Van Schaftingen E, Häusler M, Tenbrock K, van den Heuvel L, Elbracht M, Kurth I, Kraft F. C2orf69 mutations disrupt mitochondrial function and cause a multisystem human disorder with recurring autoinflammation. J Clin Invest 2021; 131:143078. [PMID: 33945503 DOI: 10.1172/jci143078] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 04/29/2021] [Indexed: 12/13/2022] Open
Abstract
BACKGROUNDDeciphering the function of the many genes previously classified as uncharacterized open reading frame (ORF) would complete our understanding of a cell's function and its pathophysiology.METHODSWhole-exome sequencing, yeast 2-hybrid and transcriptome analyses, and molecular characterization were performed in this study to uncover the function of the C2orf69 gene.RESULTSWe identified loss-of-function mutations in the uncharacterized C2orf69 gene in 8 individuals with brain abnormalities involving hypomyelination and microcephaly, liver dysfunction, and recurrent autoinflammation. C2orf69 contains an N-terminal signal peptide that is required and sufficient for mitochondrial localization. Consistent with mitochondrial dysfunction, the patients showed signs of respiratory chain defects, and a CRISPR/Cas9-KO cell model of C2orf69 had similar respiratory chain defects. Patient-derived cells revealed alterations in immunological signaling pathways. Deposits of periodic acid-Schiff-positive (PAS-positive) material in tissues from affected individuals, together with decreased glycogen branching enzyme 1 (GBE1) activity, indicated an additional impact of C2orf69 on glycogen metabolism.CONCLUSIONSOur study identifies C2orf69 as an important regulator of human mitochondrial function and suggests that this gene has additional influence on other metabolic pathways.
Collapse
Affiliation(s)
- Eva Lausberg
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Sebastian Gießelmann
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Joseph P Dewulf
- Laboratory of Physiological Chemistry, de Duve Institute and.,Department of Laboratory Medicine, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Elsa Wiame
- Laboratory of Physiological Chemistry, de Duve Institute and
| | - Anja Holz
- CeGaT GmbH and Praxis für Humangenetik, Tübingen, Germany
| | - Ramona Salvarinova
- Division of Biochemical Diseases, Department of Pediatrics, British Columbia Children's Hospital Vancouver, Vancouver, British Columbia, Canada.,British Columbia Children's Hospital Research Institute, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Clara D van Karnebeek
- Department of Pediatrics, Radboud Centre for Mitochondrial Medicine, Radboud University Medical Centre, Nijmegen, Netherlands.,Department of Pediatrics, Centre for Molecular Medicine and Therapeutics, UBC, Vancouver, British Columbia, Canada
| | | | - Kim Ohl
- Department of Pediatrics, Medical Faculty
| | - Michael Mull
- Department of Diagnostic and Interventional Neuroradiology, Medical Faculty
| | | | - Joachim Weis
- Institute of Neuropathology, Medical Faculty, RWTH University, Aachen, Germany
| | - Clemens J Sommer
- Institute of Neuropathology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | | | - Claudia Haase
- HELIOS Klinikum Erfurt, Ambulanz für Angeborene Stoffwechselerkrankungen, Sozialpädiatrisches Zentrum, Erfurt, Germany
| | | | | | - Cecile Libioulle
- Department of Human Genetics, Centre Hospitalier Universitaire (CHU) de Liège, Liège, Belgium
| | - Daniela Choukair
- Department of General Pediatrics, University Children's Hospital, Heidelberg University, Heidelberg, Germany
| | - Prasad T Oommen
- Department of Pediatric Oncology, Hematology, and Clinical Immunology, University Children's Hospital, Medical Faculty and
| | - Arndt Borkhardt
- Department of Pediatric Oncology, Hematology, and Clinical Immunology, University Children's Hospital, Medical Faculty and
| | - Harald Surowy
- Institute of Human Genetics, Medical Faculty, Heinrich-Heine University (HHU), Düsseldorf, Germany
| | - Dagmar Wieczorek
- Institute of Human Genetics, Medical Faculty, Heinrich-Heine University (HHU), Düsseldorf, Germany
| | | | - Robert Meyer
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Thomas Eggermann
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Matthias Begemann
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | | | | | | | - Lambert van den Heuvel
- Department of Pediatrics, Translational Metabolic Laboratory at the Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, Netherlands
| | - Miriam Elbracht
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Ingo Kurth
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| | - Florian Kraft
- Institute of Human Genetics, Medical Faculty, Rheinisch-Westfaelische Technische Hochschule (RWTH) Aachen University, Aachen, Germany
| |
Collapse
|
4
|
Systematic integrated analyses of methylomic and transcriptomic impacts of early combined botanicals on estrogen receptor-negative mammary cancer. Sci Rep 2021; 11:9481. [PMID: 33947955 PMCID: PMC8096837 DOI: 10.1038/s41598-021-89131-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 04/21/2021] [Indexed: 11/09/2022] Open
Abstract
Dietary botanicals such as the cruciferous vegetable broccoli sprouts (BSp) as well as green tea polyphenols (GTPs) have shown exciting potential in preventing or delaying breast cancer (BC). However, little is known about their impact on epigenomic aberrations that are centrally involved in the initiation and progression of estrogen receptor-negative [ER(−)] BC. We have investigated the efficacy of combined BSp and GTPs diets on mammary tumor inhibition in transgenic Her2/neu mice that were administered the diets from prepubescence until adulthood. Herein, we present an integrated DNA methylome and transcriptome analyses for defining the early-life epigenetic impacts of combined BSp and GTPs on mammary tumors and our results indicate that a combinatorial administration of BSp and GTPs have a stronger impact at both transcriptome and methylome levels in comparison to BSp or GTPs administered alone. We also demonstrated a streamlined approach by performing an extensive preprocessing, quality assessment and downstream analyses on the genomic dataset. Our identification of differentially methylated regions in response to dietary botanicals administered during early-life will allow us to identify key genes and facilitate implementation of the subsequent downstream functional analyses on a genomic scale and various epigenetic modifications that are crucial in preventing ER(−) mammary cancer. Furthermore, our realtime PCR results were also found to be consistent with our genome-wide analysis results. These results could be exploited as a comprehensive resource for understanding understudied genes and their associated epigenetic modifications in response to these dietary botanicals.
Collapse
|
5
|
Ma YY, Li XY, Li ZQ, Song JQ, Hou J, Li JH, Sun L, Jiang J, Yang YL. Clinical, biochemical, and genetic analysis of the mitochondrial respiratory chain complex I deficiency. Medicine (Baltimore) 2018; 97:e11606. [PMID: 30095618 PMCID: PMC6133606 DOI: 10.1097/md.0000000000011606] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Mitochondrial respiratory chain complex I deficiency is one of common mitochondrial disorders. However, the information is relatively little about the features of Chinese patients. In this study, the clinical, biological, and genetic analyses were performed in the children with respiratory chain complex I deficiency, in order to further understand the characteristics of the disease.Over a 3-year period, 67 patients (37 boys, 30 girls), presenting with unexplained multisystemic symptoms and signs were recruited. Clinical and laboratory data of the patients were summarized. Spectrophotometric assay was used for the analysis of mitochondrial complex I-V enzyme activity in peripheral leukocytes. The entire mitochondrial DNA (mtDNA) sequence was analysed for patients and their mothers.The children with respiratory chain complex I deficiency presented with multisystem dysfunction. Onset occurred before the third year of life in 96.9% patients without mtDNA mutation. Onset occurred before the third year of life in 76.5% of patients with mtDNA mutation (P = .03). About 51.5% of patients without mtDNA mutation had weakness, which is higher than 24% patients with mtDNA mutation (P = .02). Isolated complex I deficiency and combined complex I deficiency were found in 45 and 22 patients, respectively. The prevalence of isolated complex I deficiency was higher in the patients with mtDNA mutations (79.4%) than in the patients without mtDNA mutations (54.5%).Patients with nuclear DNA mutations are more likely to develop early onset in mitochondrial respiratory chain complex I deficiency. The patients with complex I deficiency of peripheral leukocytes may be more likely to be caused by mtDNA mutation.
Collapse
Affiliation(s)
- Yan-Yan Ma
- Department of Pediatrics, Qinghai University Affiliated Hospital, Xining
| | - Xi-Yuan Li
- Department of Pediatrics, Peking University First Hospital, Beijing
| | - Zhi-Qin Li
- Department of Pediatrics, Qinghai University Affiliated Hospital, Xining
| | - Ji-Qing Song
- Department of Pediatrics, Peking University First Hospital, Beijing
| | - Jing Hou
- Department of Pediatrics, Qinghai University Affiliated Hospital, Xining
| | - Jian-Hua Li
- Department of Pediatrics, Qinghai University Affiliated Hospital, Xining
| | - Li Sun
- Department of Pediatrics, Qinghai University Affiliated Hospital, Xining
| | - Jun Jiang
- Department of Oncology, Qinghai University Affiliated Hospital, Xining, China
| | - Yan-Ling Yang
- Department of Pediatrics, Peking University First Hospital, Beijing
| |
Collapse
|
6
|
Hartmann B, Wai T, Hu H, MacVicar T, Musante L, Fischer-Zirnsak B, Stenzel W, Gräf R, van den Heuvel L, Ropers HH, Wienker TF, Hübner C, Langer T, Kaindl AM. Homozygous YME1L1 mutation causes mitochondriopathy with optic atrophy and mitochondrial network fragmentation. eLife 2016; 5. [PMID: 27495975 PMCID: PMC4991934 DOI: 10.7554/elife.16078] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 07/28/2016] [Indexed: 11/13/2022] Open
Abstract
Mitochondriopathies often present clinically as multisystemic disorders of primarily high-energy consuming organs. Assembly, turnover, and surveillance of mitochondrial proteins are essential for mitochondrial function and a key task of AAA family members of metalloproteases. We identified a homozygous mutation in the nuclear encoded mitochondrial escape 1-like 1 gene YME1L1, member of the AAA protease family, as a cause of a novel mitochondriopathy in a consanguineous pedigree of Saudi Arabian descent. The homozygous missense mutation, located in a highly conserved region in the mitochondrial pre-sequence, inhibits cleavage of YME1L1 by the mitochondrial processing peptidase, which culminates in the rapid degradation of YME1L1 precursor protein. Impaired YME1L1 function causes a proliferation defect and mitochondrial network fragmentation due to abnormal processing of OPA1. Our results identify mutations in YME1L1 as a cause of a mitochondriopathy with optic nerve atrophy highlighting the importance of YME1L1 for mitochondrial functionality in humans.
Collapse
Affiliation(s)
- Bianca Hartmann
- Institute of Cell Biology and Neurobiology, Charité University Medicine, Berlin, Germany.,Department of Pediatric Neurology, Charité University Medicine, Berlin, Germany.,Sozialpädiatrisches Zentrum (SPZ), Center for Chronically Sick Children, Charité University Medicine, Berlin, Germany
| | - Timothy Wai
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, Cologne, Germany
| | - Hao Hu
- Max Planck Institute for Molecular Genetics, Berlin, Germany.,Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Thomas MacVicar
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, Cologne, Germany
| | - Luciana Musante
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Björn Fischer-Zirnsak
- Max Planck Institute for Molecular Genetics, Berlin, Germany.,Institut of Medical Genetics and Human Genetics, Charité University Medicine, Berlin, Germany
| | - Werner Stenzel
- Institute of Neuropathology, Charité University Medicine, Berlin, Germany
| | - Ralph Gräf
- Department of Cell Biology, University of Potsdam, Potsdam, Germany
| | - Lambert van den Heuvel
- Nijmegen Center for Mitochondrial Disorders, Radboud University Medical Center, Nijmegen, Netherlands
| | | | | | - Christoph Hübner
- Department of Pediatric Neurology, Charité University Medicine, Berlin, Germany
| | - Thomas Langer
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, Cologne, Germany
| | - Angela M Kaindl
- Institute of Cell Biology and Neurobiology, Charité University Medicine, Berlin, Germany.,Department of Pediatric Neurology, Charité University Medicine, Berlin, Germany.,Sozialpädiatrisches Zentrum (SPZ), Center for Chronically Sick Children, Charité University Medicine, Berlin, Germany
| |
Collapse
|
7
|
Kruse SE, Karunadharma PP, Basisty N, Johnson R, Beyer RP, MacCoss MJ, Rabinovitch PS, Marcinek DJ. Age modifies respiratory complex I and protein homeostasis in a muscle type-specific manner. Aging Cell 2016; 15:89-99. [PMID: 26498839 PMCID: PMC4717270 DOI: 10.1111/acel.12412] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/17/2015] [Indexed: 01/24/2023] Open
Abstract
Changes in mitochondrial function with age vary between different muscle types, and mechanisms underlying this variation remain poorly defined. We examined whether the rate of mitochondrial protein turnover contributes to this variation. Using heavy label proteomics, we measured mitochondrial protein turnover and abundance in slow‐twitch soleus (SOL) and fast‐twitch extensor digitorum longus (EDL) from young and aged mice. We found that mitochondrial proteins were longer lived in EDL than SOL at both ages. Proteomic analyses revealed that age‐induced changes in protein abundance differed between EDL and SOL with the largest change being increased mitochondrial respiratory protein content in EDL. To determine how altered mitochondrial proteomics affect function, we measured respiratory capacity in permeabilized SOL and EDL. The increased mitochondrial protein content in aged EDL resulted in reduced complex I respiratory efficiency in addition to increased complex I‐derived H2O2 production. In contrast, SOL maintained mitochondrial quality, but demonstrated reduced respiratory capacity with age. Thus, the decline in mitochondrial quality with age in EDL was associated with slower protein turnover throughout life that may contribute to the greater decline in mitochondrial dysfunction in this muscle. Furthermore, mitochondrial‐targeted catalase protected respiratory function with age suggesting a causal role of oxidative stress. Our data clearly indicate divergent effects of age between different skeletal muscles on mitochondrial protein homeostasis and function with the greatest differences related to complex I. These results show the importance of tissue‐specific changes in the interaction between dysregulation of respiratory protein expression, oxidative stress, and mitochondrial function with age.
Collapse
Affiliation(s)
- Shane E. Kruse
- Department of Radiology University of Washington Seattle WA USA
| | - Pabalu P. Karunadharma
- Department of Pathology University of Washington Seattle WA USA
- Scripps Research Institute Jupiter FL USA
| | - Nathan Basisty
- Department of Pathology University of Washington Seattle WA USA
| | - Richard Johnson
- Department of Genome Sciences University of Washington Seattle WA USA
| | - Richard P. Beyer
- Department of Environmental and Occupational Health Sciences University of Washington Seattle WA USA
| | | | | | - David J. Marcinek
- Department of Radiology University of Washington Seattle WA USA
- Department of Pathology University of Washington Seattle WA USA
- Department of Bioengineering University of Washington Seattle WA USA
| |
Collapse
|
8
|
Alam MT, Manjeri GR, Rodenburg RJ, Smeitink JAM, Notebaart RA, Huynen M, Willems PHGM, Koopman WJH. Skeletal muscle mitochondria of NDUFS4-/- mice display normal maximal pyruvate oxidation and ATP production. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1847:526-33. [PMID: 25687896 DOI: 10.1016/j.bbabio.2015.02.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 02/03/2015] [Accepted: 02/07/2015] [Indexed: 10/24/2022]
Abstract
Mitochondrial ATP production is mediated by the oxidative phosphorylation (OXPHOS) system, which consists of four multi-subunit complexes (CI-CIV) and the FoF1-ATP synthase (CV). Mitochondrial disorders including Leigh Syndrome often involve CI dysfunction, the pathophysiological consequences of which still remain incompletely understood. Here we combined experimental and computational strategies to gain mechanistic insight into the energy metabolism of isolated skeletal muscle mitochondria from 5-week-old wild-type (WT) and CI-deficient NDUFS4-/- (KO) mice. Enzyme activity measurements in KO mitochondria revealed a reduction of 79% in maximal CI activity (Vmax), which was paralleled by 45-72% increase in Vmax of CII, CIII, CIV and citrate synthase. Mathematical modeling of mitochondrial metabolism predicted that these Vmax changes do not affect the maximal rates of pyruvate (PYR) oxidation and ATP production in KO mitochondria. This prediction was empirically confirmed by flux measurements. In silico analysis further predicted that CI deficiency altered the concentration of intermediate metabolites, modestly increased mitochondrial NADH/NAD+ ratio and stimulated the lower half of the TCA cycle, including CII. Several of the predicted changes were previously observed in experimental models of CI-deficiency. Interestingly, model predictions further suggested that CI deficiency only has major metabolic consequences when its activity decreases below 90% of normal levels, compatible with a biochemical threshold effect. Taken together, our results suggest that mouse skeletal muscle mitochondria possess a substantial CI overcapacity, which minimizes the effects of CI dysfunction on mitochondrial metabolism in this otherwise early fatal mouse model.
Collapse
Affiliation(s)
- Mohammad T Alam
- Department of Biochemistry, RIMLS, Radboud University Medical Center, Nijmegen, The Netherlands; Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands.
| | - Ganesh R Manjeri
- Department of Biochemistry, RIMLS, Radboud University Medical Center, Nijmegen, The Netherlands; Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands.
| | - Richard J Rodenburg
- Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands; Department of Pediatrics, NCMD, Radboud University Medical Center, Nijmegen, The Netherlands.
| | - Jan A M Smeitink
- Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands; Department of Pediatrics, NCMD, Radboud University Medical Center, Nijmegen, The Netherlands.
| | - Richard A Notebaart
- Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands; Centre for Molecular and Biomolecular Informatics, RIMLS, Radboud University Medical Center, Nijmegen, The Netherlands.
| | - Martijn Huynen
- Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands; Centre for Molecular and Biomolecular Informatics, RIMLS, Radboud University Medical Center, Nijmegen, The Netherlands.
| | - Peter H G M Willems
- Department of Biochemistry, RIMLS, Radboud University Medical Center, Nijmegen, The Netherlands; Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands.
| | - Werner J H Koopman
- Department of Biochemistry, RIMLS, Radboud University Medical Center, Nijmegen, The Netherlands; Centre for Systems Biology and Bioenergetics, Radboud University Medical Centre, Nijmegen, The Netherlands.
| |
Collapse
|
9
|
Maliandi MV, Rius SP, Busi MV, Gomez-Casati DF. A simple method for the addition of rotenone in Arabidopsis thaliana leaves. PLANT SIGNALING & BEHAVIOR 2015; 10:e1073871. [PMID: 26357865 PMCID: PMC4883935 DOI: 10.1080/15592324.2015.1073871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 07/12/2015] [Indexed: 06/05/2023]
Abstract
A simple and reproducible method for the treatment of Arabidopsis thaliana leaves with rotenone is presented. Rosette leaves were incubated with rotenone and Triton X-100 for at least 15 h. Treated leaves showed increased expression of COX19 and BCS1a, 2 genes known to be induced in Arabidopsis cell cultures after rotenone treatment. Moreover, rotenone/Triton X-100 incubated leaves presented an inhibition of oxygen uptake. The simplicity of the procedure shows this methodology is useful for studying the effect of the addition of rotenone to a photosynthetic tissue in situ.
Collapse
Affiliation(s)
- María V Maliandi
- IIB- INTECH; Universidad Nacional de General San Martín (UNSAM); Chascomús, Buenos Aires, Argentina
| | - Sebastián P Rius
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET); Universidad Nacional de Rosario; Rosario, Argentina
| | - María V Busi
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET); Universidad Nacional de Rosario; Rosario, Argentina
| | - Diego F Gomez-Casati
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET); Universidad Nacional de Rosario; Rosario, Argentina
| |
Collapse
|
10
|
Becker L, Kling E, Schiller E, Zeh R, Schrewe A, Hölter SM, Mossbrugger I, Calzada-Wack J, Strecker V, Wittig I, Dumitru I, Wenz T, Bender A, Aichler M, Janik D, Neff F, Walch A, Quintanilla-Fend L, Floss T, Bekeredjian R, Gailus-Durner V, Fuchs H, Wurst W, Meitinger T, Prokisch H, de Angelis MH, Klopstock T. MTO1-deficient mouse model mirrors the human phenotype showing complex I defect and cardiomyopathy. PLoS One 2014; 9:e114918. [PMID: 25506927 PMCID: PMC4266617 DOI: 10.1371/journal.pone.0114918] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 11/15/2014] [Indexed: 01/23/2023] Open
Abstract
Recently, mutations in the mitochondrial translation optimization factor 1 gene (MTO1) were identified as causative in children with hypertrophic cardiomyopathy, lactic acidosis and respiratory chain defect. Here, we describe an MTO1-deficient mouse model generated by gene trap mutagenesis that mirrors the human phenotype remarkably well. As in patients, the most prominent signs and symptoms were cardiovascular and included bradycardia and cardiomyopathy. In addition, the mutant mice showed a marked worsening of arrhythmias during induction and reversal of anaesthesia. The detailed morphological and biochemical workup of murine hearts indicated that the myocardial damage was due to complex I deficiency and mitochondrial dysfunction. In contrast, neurological examination was largely normal in Mto1-deficient mice. A translational consequence of this mouse model may be to caution against anaesthesia-related cardiac arrhythmias which may be fatal in patients.
Collapse
Affiliation(s)
- Lore Becker
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximilians-University, Munich, Germany
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Eva Kling
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Evelyn Schiller
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximilians-University, Munich, Germany
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Ramona Zeh
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximilians-University, Munich, Germany
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Anja Schrewe
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Department of Cardiology, University of Heidelberg, Heidelberg, Germany
| | - Sabine M. Hölter
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Ilona Mossbrugger
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Julia Calzada-Wack
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Valentina Strecker
- Functional Proteomics, Goethe-University Frankfurt, Frankfurt am Main, Germany
| | - Ilka Wittig
- Functional Proteomics, Goethe-University Frankfurt, Frankfurt am Main, Germany
- German Network for Mitochondrial Disorders (mitoNET), Munich, Germany
| | - Iulia Dumitru
- Institute for Genetics, University of Cologne, Cologne, Germany
| | - Tina Wenz
- Institute for Genetics, University of Cologne, Cologne, Germany
- German Network for Mitochondrial Disorders (mitoNET), Munich, Germany
| | - Andreas Bender
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximilians-University, Munich, Germany
| | - Michaela Aichler
- Research Unit Analytical Pathology – Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Dirk Janik
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Frauke Neff
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Axel Walch
- Research Unit Analytical Pathology – Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Leticia Quintanilla-Fend
- Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Thomas Floss
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Raffi Bekeredjian
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Department of Cardiology, University of Heidelberg, Heidelberg, Germany
| | - Valérie Gailus-Durner
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Helmut Fuchs
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
| | - Wolfgang Wurst
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Technical University Munich, Chair of Developmental Genetics, c/o Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Max-Planck-Institute of Psychiatry, Munich, Germany
- German Center for Vertigo and Balance Disorders, Munich, Germany
| | - Thomas Meitinger
- Institute of Human Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Deutsches Forschungszentrum für Herz-Kreislauferkrankungen (DZHK), partner site Munich Heart Alliance, Munich, Germany
- Institute of Human Genetics, Technical University Munich, Munich, Germany
| | - Holger Prokisch
- Institute of Human Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Human Genetics, Technical University Munich, Munich, Germany
- German Network for Mitochondrial Disorders (mitoNET), Munich, Germany
| | - Martin Hrabě de Angelis
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- German Center for Vertigo and Balance Disorders, Munich, Germany
- Chair of Experimental Genetics, Center of Life and Food Sciences Weihenstephan, Technical University Munich, Freising-Weihenstephan, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Thomas Klopstock
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximilians-University, Munich, Germany
- German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environment and Health, Neuherberg, Germany
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- German Center for Vertigo and Balance Disorders, Munich, Germany
- German Network for Mitochondrial Disorders (mitoNET), Munich, Germany
- * E-mail:
| |
Collapse
|
11
|
Loftus SJ, Crawford DL. Interindividual variation in Complex I activity in Fundulus heteroclitus along a steep thermocline. Physiol Biochem Zool 2012; 86:82-91. [PMID: 23303323 DOI: 10.1086/668850] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The first enzyme in the oxidative phosphorylation pathway is Complex I (EC 1.6.5.3). Complex I is a large heteromeric enzyme complex with 45 protein subunits that translocates H(+) ions across the mitochondrial inner membrane. Among northern and southern populations of the teleost fish Fundulus heteroclitus, Complex I subunits have fixed amino acid substitutions. Additionally, there are differences in oxidative phosphorylation activity among populations of F. heteroclitus. To investigate whether these differences are related to Complex I, enzyme activity was measured in 121 individuals from five populations of F. heteroclitus and its sister species Fundulus grandis acclimated to a constant 20°C temperature. Within each population, Complex I activity is highly variable among individuals of F. heteroclitus (coefficient of variation percentage among individuals has a mean of 90% in the five F. heteroclitus populations), and the mean Complex I activity among populations is significantly different at the latitudinal extremes of the range. Importantly, Complex I activity is more similar between F. heteroclitus from the southernmost population and its sister species F. grandis than to the northern populations of F. heteroclitus, suggesting important evolutionary differences. Unexpectedly, the activity is nearly fourfold higher in southern populations than northern populations. Mitochondrial density appears to compensate partially for decreased activity in northern individuals; activity per wet weight is only twofold higher in southern populations. We suggest that some of the variation in Complex I activity is genetically based and thus is being influenced by directional selection. However, this conclusion presents a conundrum: there should not be so much variation in Complex I activity within a population if this variation is biologically important.
Collapse
Affiliation(s)
- Samuel J Loftus
- Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA
| | | |
Collapse
|
12
|
Primary fibroblasts of NDUFS4(-/-) mice display increased ROS levels and aberrant mitochondrial morphology. Mitochondrion 2012; 13:436-43. [PMID: 23234723 DOI: 10.1016/j.mito.2012.12.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 11/28/2012] [Accepted: 12/03/2012] [Indexed: 11/22/2022]
Abstract
The human NDUFS4 gene encodes an accessory subunit of the first mitochondrial oxidative phosphorylation complex (CI) and, when mutated, is associated with progressive neurological disorders. Here we analyzed primary muscle and skin fibroblasts from NDUFS4(-/-) mice with respect to reactive oxygen species (ROS) levels and mitochondrial morphology. NDUFS4(-/-) fibroblasts displayed an inactive CI subcomplex on native gels but proliferated normally and showed no obvious signs of apoptosis. Oxidation of the ROS sensor hydroethidium was increased and mitochondria were less branched and/or shorter in NDUFS4(-/-) fibroblasts. We discuss the relevance of these findings with respect to previous results and therapy development.
Collapse
|
13
|
Hoefs SJ, Rodenburg RJ, Smeitink JA, van den Heuvel LP. Molecular base of biochemical complex I deficiency. Mitochondrion 2012; 12:520-32. [DOI: 10.1016/j.mito.2012.07.106] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 07/06/2012] [Accepted: 07/10/2012] [Indexed: 12/21/2022]
|
14
|
Larosa V, Coosemans N, Motte P, Bonnefoy N, Remacle C. Reconstruction of a human mitochondrial complex I mutation in the unicellular green alga Chlamydomonas. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2012; 70:759-768. [PMID: 22268373 DOI: 10.1111/j.1365-313x.2012.04912.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Defects in complex I (NADH:ubiquinone oxidoreductase (EC 1.6.5.3)) are the most frequent cause of human respiratory disorders. The pathogenicity of a given human mitochondrial mutation can be difficult to demonstrate because the mitochondrial genome harbors large numbers of polymorphic base changes that have no pathogenic significance. In addition, mitochondrial mutations are usually found in the heteroplasmic state, which may hide the biochemical effect of the mutation. We propose that the unicellular green alga Chlamydomonas could be used to study such mutations because (i) respiratory complex-deficient mutants are viable and mitochondrial mutations are found in the homoplasmic state, (ii) transformation of the mitochondrial genome is feasible, and (iii) Chlamydomonas complex I is similar to that of humans. To illustrate this proposal, we introduced a Leu157Pro substitution into the Chlamydomonas ND4 subunit of complex I in two recipient strains by biolistic transformation, demonstrating that site-directed mutagenesis of the Chlamydomonas mitochondrial genome is possible. This substitution did not lead to any respiratory enzyme defects when present in the heteroplasmic state in a patient with chronic progressive external ophthalmoplegia. When present in the homoplasmic state in the alga, the mutation does not prevent assembly of whole complex I (950 kDa) and the NADH dehydrogenase activity of the peripheral arm of the complex is mildly affected. However, the NADH:duroquinone oxidoreductase activity is strongly reduced, suggesting that the substitution could affect binding of ubiquinone to the membrane domain. The in vitro defects correlate with a decrease in dark respiration and growth rate in vivo.
Collapse
Affiliation(s)
- Véronique Larosa
- Genetics of Microorganisms, Department of Life Sciences, Institute of Botany, University of Liege, B-4000 Liege, Belgium
| | | | | | | | | |
Collapse
|
15
|
Heo JY, Park JH, Kim SJ, Seo KS, Han JS, Lee SH, Kim JM, Park JI, Park SK, Lim K, Hwang BD, Shong M, Kweon GR. DJ-1 null dopaminergic neuronal cells exhibit defects in mitochondrial function and structure: involvement of mitochondrial complex I assembly. PLoS One 2012; 7:e32629. [PMID: 22403686 PMCID: PMC3293835 DOI: 10.1371/journal.pone.0032629] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 02/01/2012] [Indexed: 11/18/2022] Open
Abstract
DJ-1 is a Parkinson's disease-associated gene whose protein product has a protective role in cellular homeostasis by removing cytosolic reactive oxygen species and maintaining mitochondrial function. However, it is not clear how DJ-1 regulates mitochondrial function and why mitochondrial dysfunction is induced by DJ-1 deficiency. In a previous study we showed that DJ-1 null dopaminergic neuronal cells exhibit defective mitochondrial respiratory chain complex I activity. In the present article we investigated the role of DJ-1 in complex I formation by using blue native-polyacrylamide gel electrophoresis and 2-dimensional gel analysis to assess native complex status. On the basis of these experiments, we concluded that DJ-1 null cells have a defect in the assembly of complex I. Concomitant with abnormal complex I formation, DJ-1 null cells show defective supercomplex formation. It is known that aberrant formation of the supercomplex impairs the flow of electrons through the channels between respiratory chain complexes, resulting in mitochondrial dysfunction. We took two approaches to study these mitochondrial defects. The first approach assessed the structural defect by using both confocal microscopy with MitoTracker staining and electron microscopy. The second approach assessed the functional defect by measuring ATP production, O2 consumption, and mitochondrial membrane potential. Finally, we showed that the assembly defect as well as the structural and functional abnormalities in DJ-1 null cells could be reversed by adenovirus-mediated overexpression of DJ-1, demonstrating the specificity of DJ-1 on these mitochondrial properties. These mitochondrial defects induced by DJ-1mutation may be a pathological mechanism for the degeneration of dopaminergic neurons in Parkinson's disease.
Collapse
Affiliation(s)
- Jun Young Heo
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
- Infection Signaling Network Research Center, Chungnam National University School of Medicine, Daejeon, Korea
| | - Ji Hoon Park
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
| | - Soung Jung Kim
- Research Center for Endocrine and Metabolic Diseases, Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
| | - Kang Sik Seo
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
| | - Jeong Su Han
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
| | - Sang Hee Lee
- Department of Pathology, Chungnam National University School of Medicine, Daejeon, Korea
| | - Jin Man Kim
- Department of Pathology, Chungnam National University School of Medicine, Daejeon, Korea
| | - Jong Il Park
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
| | - Seung Kiel Park
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
| | - Kyu Lim
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
- Infection Signaling Network Research Center, Chungnam National University School of Medicine, Daejeon, Korea
| | - Byung Doo Hwang
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
| | - Minho Shong
- Research Center for Endocrine and Metabolic Diseases, Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
| | - Gi Ryang Kweon
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, Korea
- Research Institute for Medical Science, Chungnam National University School of Medicine, Daejeon, Korea
- * E-mail:
| |
Collapse
|
16
|
Smits P, Saada A, Wortmann SB, Heister AJ, Brink M, Pfundt R, Miller C, Haas D, Hantschmann R, Rodenburg RJT, Smeitink JAM, van den Heuvel LP. Mutation in mitochondrial ribosomal protein MRPS22 leads to Cornelia de Lange-like phenotype, brain abnormalities and hypertrophic cardiomyopathy. Eur J Hum Genet 2011; 19:394-9. [PMID: 21189481 PMCID: PMC3060326 DOI: 10.1038/ejhg.2010.214] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Revised: 10/06/2010] [Accepted: 11/10/2010] [Indexed: 11/08/2022] Open
Abstract
The oxidative phosphorylation (OXPHOS) system is under control of both the mitochondrial and the nuclear genomes; 13 subunits are synthesized by the mitochondrial translation machinery. We report a patient with Cornelia de Lange-like dysmorphic features, brain abnormalities and hypertrophic cardiomyopathy, and studied the genetic defect responsible for the combined OXPHOS complex I, III and IV deficiency observed in fibroblasts. The combination of deficiencies suggested a primary defect associated with the synthesis of mitochondrially encoded OXPHOS subunits. Analysis of mitochondrial protein synthesis revealed a marked impairment in mitochondrial translation. Homozygosity mapping and sequence analysis of candidate genes revealed a homozygous mutation in MRPS22, a gene encoding a mitochondrial ribosomal small subunit protein. The mutation predicts a Leu215Pro substitution at an evolutionary conserved site. Mutations in genes implicated in Cornelia de Lange syndrome or copy number variations were not found. Transfection of patient fibroblasts, in which MRPS22 was undetectable, with the wild-type MRPS22 cDNA restored the amount and activity of OXPHOS complex IV, as well as the 12S rRNA transcript level to normal values. These findings demonstrate the pathogenicity of the MRPS22 mutation and stress the significance of mutations in nuclear genes, including genes that have no counterparts in lower species like bacteria and yeast, for mitochondrial translation defects.
Collapse
Affiliation(s)
- Paulien Smits
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Ann Saada
- Department of Genetics and Metabolic Diseases, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Saskia B Wortmann
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Angelien J Heister
- Department of Human Genetics, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Maaike Brink
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Rolph Pfundt
- Department of Human Genetics, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Chaya Miller
- Department of Genetics and Metabolic Diseases, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Dorothea Haas
- University Hospital for Pediatric and Adolescent Medicine, Division of Inborn Metabolic Diseases, Heidelberg, Germany
| | - Ralph Hantschmann
- Kinderneurologisches Zentrum SPZ, Allgemeinen Krankenhaus Hagen, Hagen, Germany
| | - Richard J T Rodenburg
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Jan A M Smeitink
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Lambert P van den Heuvel
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
- Department of Pediatrics, Academic Hospital Leuven, Leuven, Belgium
| |
Collapse
|
17
|
Swalwell H, Kirby DM, Blakely EL, Mitchell A, Salemi R, Sugiana C, Compton AG, Tucker EJ, Ke BX, Lamont PJ, Turnbull DM, McFarland R, Taylor RW, Thorburn DR. Respiratory chain complex I deficiency caused by mitochondrial DNA mutations. Eur J Hum Genet 2011; 19:769-75. [PMID: 21364701 DOI: 10.1038/ejhg.2011.18] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Defects of the mitochondrial respiratory chain are associated with a diverse spectrum of clinical phenotypes, and may be caused by mutations in either the nuclear or the mitochondrial genome (mitochondrial DNA (mtDNA)). Isolated complex I deficiency is the most common enzyme defect in mitochondrial disorders, particularly in children in whom family history is often consistent with sporadic or autosomal recessive inheritance, implicating a nuclear genetic cause. In contrast, although a number of recurrent, pathogenic mtDNA mutations have been described, historically, these have been perceived as rare causes of paediatric complex I deficiency. We reviewed the clinical and genetic findings in a large cohort of 109 paediatric patients with isolated complex I deficiency from 101 families. Pathogenic mtDNA mutations were found in 29 of 101 probands (29%), 21 in MTND subunit genes and 8 in mtDNA tRNA genes. Nuclear gene defects were inferred in 38 of 101 (38%) probands based on cell hybrid studies, mtDNA sequencing or mutation analysis (nuclear gene mutations were identified in 22 probands). Leigh or Leigh-like disease was the most common clinical presentation in both mtDNA and nuclear genetic defects. The median age at onset was higher in mtDNA patients (12 months) than in patients with a nuclear gene defect (3 months). However, considerable overlap existed, with onset varying from 0 to >60 months in both groups. Our findings confirm that pathogenic mtDNA mutations are a significant cause of complex I deficiency in children. In the absence of parental consanguinity, we recommend whole mitochondrial genome sequencing as a key approach to elucidate the underlying molecular genetic abnormality.
Collapse
Affiliation(s)
- Helen Swalwell
- Mitochondrial Research Group, Institute for Ageing and Health, The Medical School, Newcastle University, Newcastle upon Tyne, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
In this review, we trace the origins and follow the development of mitochondrial medicine from the premolecular era (1962-1988) based on clinical clues, muscle morphology, and biochemistry into the molecular era that started in 1988 and is still advancing at a brisk pace. We have tried to stress conceptual advances, such as endosymbiosis, uniparental inheritance, intergenomic signaling and its defects, and mitochondrial dynamics. We hope that this historical review also provides an update on mitochondrial medicine, although we fully realize that the speed of progress in this area makes any such endeavor akin to writing on water.
Collapse
Affiliation(s)
- Salvatore DiMauro
- Columbia University Medical Center, College of Physicians & Surgeons, 630 West 168th Street, New York, NY 10032, USA.
| | | |
Collapse
|
19
|
Rea SL, Graham BH, Nakamaru-Ogiso E, Kar A, Falk MJ. Bacteria, yeast, worms, and flies: exploiting simple model organisms to investigate human mitochondrial diseases. ACTA ACUST UNITED AC 2011; 16:200-18. [PMID: 20818735 DOI: 10.1002/ddrr.114] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The extensive conservation of mitochondrial structure, composition, and function across evolution offers a unique opportunity to expand our understanding of human mitochondrial biology and disease. By investigating the biology of much simpler model organisms, it is often possible to answer questions that are unreachable at the clinical level. Here, we review the relative utility of four different model organisms, namely the bacterium Escherichia coli, the yeast Saccharomyces cerevisiae, the nematode Caenorhabditis elegans, and the fruit fly Drosophila melanogaster, in studying the role of mitochondrial proteins relevant to human disease. E. coli are single cell, prokaryotic bacteria that have proven to be a useful model system in which to investigate mitochondrial respiratory chain protein structure and function. S. cerevisiae is a single-celled eukaryote that can grow equally well by mitochondrial-dependent respiration or by ethanol fermentation, a property that has proven to be a veritable boon for investigating mitochondrial functionality. C. elegans is a multicellular, microscopic worm that is organized into five major tissues and has proven to be a robust model animal for in vitro and in vivo studies of primary respiratory chain dysfunction and its potential therapies in humans. Studied for over a century, D. melanogaster is a classic metazoan model system offering an abundance of genetic tools and reagents that facilitates investigations of mitochondrial biology using both forward and reverse genetics. The respective strengths and limitations of each species relative to mitochondrial studies are explored. In addition, an overview is provided of major discoveries made in mitochondrial biology in each of these four model systems.
Collapse
Affiliation(s)
- Shane L Rea
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245-3207, USA.
| | | | | | | | | |
Collapse
|
20
|
Ferreira M, Torraco A, Rizza T, Fattori F, Meschini MC, Castana C, Go NE, Nargang FE, Duarte M, Piemonte F, Dionisi-Vici C, Videira A, Vilarinho L, Santorelli FM, Carrozzo R, Bertini E. Progressive cavitating leukoencephalopathy associated with respiratory chain complex I deficiency and a novel mutation in NDUFS1. Neurogenetics 2011; 12:9-17. [DOI: 10.1007/s10048-010-0265-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Accepted: 11/12/2010] [Indexed: 11/24/2022]
|
21
|
NDUFA10 mutations cause complex I deficiency in a patient with Leigh disease. Eur J Hum Genet 2010; 19:270-4. [PMID: 21150889 DOI: 10.1038/ejhg.2010.204] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Mitochondrial complex I deficiency is the most common defect of the oxidative phosphorylation system. We report a patient with Leigh syndrome who showed a complex I deficiency expressed in cultured fibroblasts and muscle tissue. To find the genetic cause of the complex I deficiency, we screened the mitochondrial DNA and the nuclear-encoded subunits of complex I. We identified compound-heterozygous mutations in the NDUFA10 gene, encoding an accessory subunit of complex I. The first mutation disrupted the start codon and the second mutation resulted in an amino acid substitution. The fibroblasts of the patient displayed decreased amount and activity, and a disturbed assembly of complex I. These results indicate that NDUFA10 is a novel candidate gene to screen for disease-causing mutations in patients with complex I deficiency.
Collapse
|
22
|
Smits P, Antonicka H, van Hasselt PM, Weraarpachai W, Haller W, Schreurs M, Venselaar H, Rodenburg RJ, Smeitink JA, van den Heuvel LP. Mutation in subdomain G' of mitochondrial elongation factor G1 is associated with combined OXPHOS deficiency in fibroblasts but not in muscle. Eur J Hum Genet 2010; 19:275-9. [PMID: 21119709 DOI: 10.1038/ejhg.2010.208] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The mitochondrial translation system is responsible for the synthesis of 13 proteins required for oxidative phosphorylation (OXPHOS), the major energy-generating process of our cells. Mitochondrial translation is controlled by various nuclear encoded proteins. In 27 patients with combined OXPHOS deficiencies, in whom complex II (the only complex that is entirely encoded by the nuclear DNA) showed normal activities, and mutations in the mitochondrial genome as well as polymerase gamma were excluded, we screened all mitochondrial translation factors for mutations. Here, we report a mutation in mitochondrial elongation factor G1 (GFM1) in a patient affected by severe, rapidly progressive mitochondrial encephalopathy. This mutation is predicted to result in an Arg250Trp substitution in subdomain G' of the elongation factor G1 protein and is presumed to hamper ribosome-dependent GTP hydrolysis. Strikingly, the decrease in enzyme activities of complex I, III and IV detected in patient fibroblasts was not found in muscle tissue. The OXPHOS system defects and the impairment in mitochondrial translation in fibroblasts were rescued by overexpressing wild-type GFM1, establishing the GFM1 defect as the cause of the fatal mitochondrial disease. Furthermore, this study evinces the importance of a thorough diagnostic biochemical analysis of both muscle tissue and fibroblasts in patients suspected to suffer from a mitochondrial disorder, as enzyme deficiencies can be selectively expressed.
Collapse
Affiliation(s)
- Paulien Smits
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Smits P, Rodenburg RJ, Smeitink JAM, van den Heuvel LP. Sequence variants in four candidate genes (NIPSNAP1, GBAS, CHCHD1 and METT11D1) in patients with combined oxidative phosphorylation system deficiencies. J Inherit Metab Dis 2010; 33 Suppl 3:S13-9. [PMID: 24137763 DOI: 10.1007/s10545-009-0968-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The oxidative phosphorylation (OXPHOS) system, comprising five enzyme complexes, is located in the inner membrane of mitochondria and is the final biochemical pathway in oxidative ATP production. Defects in this energy-generating system can cause a wide range of clinical symptoms; these diseases are often progressive and multisystemic. Numerous genes have been implicated in OXPHOS deficiencies and many mutations have been described. However, in a substantial number of patients with decreased enzyme activities of two or more OXPHOS complexes, no mutations in the mitochondrial DNA or in nuclear genes known to be involved in these disorders have been found. In this study, four nuclear candidate genes--NIPSNAP1, GBAS, CHCHD1 and METT11D1--were screened for mutations in 22 patients with a combined enzymatic deficiency of primarily the OXPHOS complexes I, III and IV to determine whether a mutation in one of these genes could explain the mitochondrial disorder. For each variant not yet reported as a polymorphism, 100 control samples were screened for the presence of the variant. This way we identified 14 new polymorphisms and 2 presumably non-pathogenic mutations. No mutations were found that could explain the mitochondrial disorder in the patients investigated in this study. Therefore, the genetic defect in these patients must be located in other nuclear genes involved in mtDNA maintenance, transcription or translation, in import, processing or degradation of nuclear encoded mitochondrial proteins, or in assembly of the OXPHOS system.
Collapse
Affiliation(s)
- P Smits
- Department of Pediatrics, Nijmegen Centre for Mitochondrial Disorders, Radboud University Nijmegen Medical Centre, Geert Grooteplein 10, PO Box 9101, 6500 HB Nijmegen, The Netherlands
| | | | | | | |
Collapse
|
24
|
Kolanczyk M, Pech M, Zemojtel T, Yamamoto H, Mikula I, Calvaruso MA, van den Brand M, Richter R, Fischer B, Ritz A, Kossler N, Thurisch B, Spoerle R, Smeitink J, Kornak U, Chan D, Vingron M, Martasek P, Lightowlers RN, Nijtmans L, Schuelke M, Nierhaus KH, Mundlos S. NOA1 is an essential GTPase required for mitochondrial protein synthesis. Mol Biol Cell 2010; 22:1-11. [PMID: 21118999 PMCID: PMC3016967 DOI: 10.1091/mbc.e10-07-0643] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Nitric oxide associated-1 (NOA1) is an evolutionarily conserved guanosine triphosphate binding protein that localizes predominantly to mitochondria in mammalian cells. Here we determine NOA1 function through generation of knock-out mice and in vitro assays. Nitric oxide associated-1 (NOA1) is an evolutionarily conserved guanosine triphosphate (GTP) binding protein that localizes predominantly to mitochondria in mammalian cells. On the basis of bioinformatic analysis, we predicted its possible involvement in ribosomal biogenesis, although this had not been supported by any experimental evidence. Here we determine NOA1 function through generation of knockout mice and in vitro assays. NOA1-deficient mice exhibit midgestation lethality associated with a severe developmental defect of the embryo and trophoblast. Primary embryonic fibroblasts isolated from NOA1 knockout embryos show deficient mitochondrial protein synthesis and a global defect of oxidative phosphorylation (OXPHOS). Additionally, Noa1–/– cells are impaired in staurosporine-induced apoptosis. The analysis of mitochondrial ribosomal subunits from Noa1–/– cells by sucrose gradient centrifugation and Western blotting showed anomalous sedimentation, consistent with a defect in mitochondrial ribosome assembly. Furthermore, in vitro experiments revealed that intrinsic NOA1 GTPase activity was stimulated by bacterial ribosomal constituents. Taken together, our data show that NOA1 is required for mitochondrial protein synthesis, likely due to its yet unidentified role in mitoribosomal biogenesis. Thus, NOA1 is required for such basal mitochondrial functions as adenosine triphosphate (ATP) synthesis and apoptosis.
Collapse
Affiliation(s)
- Mateusz Kolanczyk
- Development & Disease Group, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Calvo SE, Tucker EJ, Compton AG, Kirby DM, Crawford G, Burtt NP, Rivas M, Guiducci C, Bruno DL, Goldberger OA, Redman MC, Wiltshire E, Wilson CJ, Altshuler D, Gabriel SB, Daly MJ, Thorburn DR, Mootha VK. High-throughput, pooled sequencing identifies mutations in NUBPL and FOXRED1 in human complex I deficiency. Nat Genet 2010; 42:851-8. [PMID: 20818383 PMCID: PMC2977978 DOI: 10.1038/ng.659] [Citation(s) in RCA: 284] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Accepted: 08/11/2010] [Indexed: 12/15/2022]
Abstract
Discovering the molecular basis of mitochondrial respiratory chain disease is challenging given the large number of both mitochondrial and nuclear genes that are involved. We report a strategy of focused candidate gene prediction, high-throughput sequencing and experimental validation to uncover the molecular basis of mitochondrial complex I disorders. We created seven pools of DNA from a cohort of 103 cases and 42 healthy controls and then performed deep sequencing of 103 candidate genes to identify 151 rare variants that were predicted to affect protein function. We established genetic diagnoses in 13 of 60 previously unsolved cases using confirmatory experiments, including cDNA complementation to show that mutations in NUBPL and FOXRED1 can cause complex I deficiency. Our study illustrates how large-scale sequencing, coupled with functional prediction and experimental validation, can be used to identify causal mutations in individual cases.
Collapse
Affiliation(s)
- Sarah E Calvo
- Center for Human Genetic Research, Massachusetts General Hospital, Boston, Massachusetts, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Valsecchi F, Koopman WJ, Manjeri GR, Rodenburg RJ, Smeitink JA, Willems PH. Complex I disorders: Causes, mechanisms, and development of treatment strategies at the cellular level. ACTA ACUST UNITED AC 2010; 16:175-82. [DOI: 10.1002/ddrr.107] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
27
|
Koopman WJH, Nijtmans LGJ, Dieteren CEJ, Roestenberg P, Valsecchi F, Smeitink JAM, Willems PHGM. Mammalian mitochondrial complex I: biogenesis, regulation, and reactive oxygen species generation. Antioxid Redox Signal 2010; 12:1431-70. [PMID: 19803744 DOI: 10.1089/ars.2009.2743] [Citation(s) in RCA: 301] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Virtually every mammalian cell contains mitochondria. These double-membrane organelles continuously change shape and position and contain the complete metabolic machinery for the oxidative conversion of pyruvate, fatty acids, and amino acids into ATP. Mitochondria are crucially involved in cellular Ca2+ and redox homeostasis and apoptosis induction. Maintenance of mitochondrial function and integrity requires an inside-negative potential difference across the mitochondrial inner membrane. This potential is sustained by the electron-transport chain (ETC). NADH:ubiquinone oxidoreductase or complex I (CI), the first and largest protein complex of the ETC, couples the oxidation of NADH to the reduction of ubiquinone. During this process, electrons can escape from CI and react with ambient oxygen to produce superoxide and derived reactive oxygen species (ROS). Depending on the balance between their production and removal by antioxidant systems, ROS may function as signaling molecules or induce damage to a variety of biomolecules or both. The latter ultimately leads to a loss of mitochondrial and cellular function and integrity. In this review, we discuss (a) the role of CI in mitochondrial functioning; (b) the composition, structure, and biogenesis of CI; (c) regulation of CI function; (d) the role of CI in ROS generation; and (e) adaptive responses to CI deficiency.
Collapse
Affiliation(s)
- Werner J H Koopman
- Department of Biochemistry, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
| | | | | | | | | | | | | |
Collapse
|
28
|
Five entry points of the mitochondrially encoded subunits in mammalian complex I assembly. Mol Cell Biol 2010; 30:3038-47. [PMID: 20385768 DOI: 10.1128/mcb.00025-10] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Complex I (CI) is the largest enzyme of the mammalian mitochondrial respiratory chain. The biogenesis of the complex is a very complex process due to its large size and number of subunits (45 subunits). The situation is further complicated due to the fact that its subunits have a double genomic origin, as seven of them are encoded by the mitochondrial DNA. Understanding of the assembly process and characterization of the involved factors has advanced very much in the last years. However, until now, a key part of the process, that is, how and at which step the mitochondrially encoded CI subunits (ND subunits) are incorporated in the CI assembly process, was not known. Analyses of several mouse cell lines mutated for three ND subunits allowed us to determine the importance of each one for complex assembly/stability and that there are five different steps within the assembly pathway in which some mitochondrially encoded CI subunit is incorporated.
Collapse
|
29
|
Smits P, Mattijssen S, Morava E, van den Brand M, van den Brandt F, Wijburg F, Pruijn G, Smeitink J, Nijtmans L, Rodenburg R, van den Heuvel L. Functional consequences of mitochondrial tRNA Trp and tRNA Arg mutations causing combined OXPHOS defects. Eur J Hum Genet 2010; 18:324-9. [PMID: 19809478 PMCID: PMC2987211 DOI: 10.1038/ejhg.2009.169] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 07/16/2009] [Accepted: 08/11/2009] [Indexed: 11/09/2022] Open
Abstract
Combined oxidative phosphorylation (OXPHOS) system deficiencies are a group of mitochondrial disorders that are associated with a range of clinical phenotypes and genetic defects. They occur in approximately 30% of all OXPHOS disorders and around 4% are combined complex I, III and IV deficiencies. In this study we present two mutations in the mitochondrial tRNA(Trp) (MT-TW) and tRNA(Arg) (MT-TR) genes, m.5556G>A and m.10450A>G, respectively, which were detected in two unrelated patients showing combined OXPHOS complex I, III and IV deficiencies and progressive multisystemic diseases. Both mitochondrial tRNA mutations were almost homoplasmic in fibroblasts and muscle tissue of the two patients and not present in controls. Patient fibroblasts showed a general mitochondrial translation defect. The mutations resulted in lowered steady-state levels and altered conformations of the tRNAs. Cybrid cell lines showed similar tRNA defects and impairment of OXPHOS complex assembly as patient fibroblasts. Our results show that these tRNA(Trp) and tRNA(Arg) mutations cause the combined OXPHOS deficiencies in the patients, adding to the still expanding group of pathogenic mitochondrial tRNA mutations.
Collapse
MESH Headings
- Base Sequence
- Blotting, Northern
- Child, Preschool
- DNA Mutational Analysis
- DNA, Mitochondrial/genetics
- Electron Transport Complex I/metabolism
- Electrophoresis, Polyacrylamide Gel
- Fatal Outcome
- Female
- Fibroblasts/enzymology
- Fibroblasts/pathology
- Humans
- Infant
- Infant, Newborn
- Male
- Mitochondria/enzymology
- Mitochondria/genetics
- Mitochondrial Diseases/genetics
- Molecular Sequence Data
- Muscle, Skeletal/enzymology
- Muscle, Skeletal/pathology
- Mutation/genetics
- Nucleic Acid Conformation
- Pregnancy
- Protein Biosynthesis
- RNA, Transfer, Amino Acyl/chemistry
- RNA, Transfer, Amino Acyl/genetics
Collapse
Affiliation(s)
- Paulien Smits
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Sandy Mattijssen
- Department of Biomolecular Chemistry, Nijmegen Center for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Eva Morava
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Mariël van den Brand
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Frans van den Brandt
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Frits Wijburg
- Department of Pediatrics (G8-205), Emma Children's Hospital AMC, Academic Medical Center, Amsterdam, The Netherlands
| | - Ger Pruijn
- Department of Biomolecular Chemistry, Nijmegen Center for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Jan Smeitink
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Leo Nijtmans
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Richard Rodenburg
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Lambert van den Heuvel
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| |
Collapse
|
30
|
Janssen RJ, Distelmaier F, Smeets R, Wijnhoven T, Ostergaard E, Jaspers NG, Raams A, Kemp S, Rodenburg RJ, Willems PH, van den Heuvel LP, Smeitink JA, Nijtmans LG. Contiguous gene deletion of ELOVL7, ERCC8 and NDUFAF2 in a patient with a fatal multisystem disorder. Hum Mol Genet 2009; 18:3365-74. [DOI: 10.1093/hmg/ddp276] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
|
31
|
Morava E, Rodenburg RJ, Hol F, de Vries M, Janssen A, van den Heuvel L, Nijtmans L, Smeitink J. Clinical and biochemical characteristics in patients with a high mutant load of the mitochondrial T8993G/C mutations. Am J Med Genet A 2009; 140:863-8. [PMID: 16532470 DOI: 10.1002/ajmg.a.31194] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We retrospectively analyzed the clinical, histological, and biochemical data of 11 children, five of which carried the maternally-inherited mitochondrial T8993C and six carrying the T8993G point mutations in the ATP synthase 6 gene. The percentage of heteroplasmy was 95% or higher in muscle and in blood. All patients had an early clinical presentation with muscle hypotonia, severe extrapyramidal dysfunction and Leigh disease demonstrated by the cranial MRI. A slower clinical progression and more frequent sensory-neuronal involvement were noted in the patients carrying the T8993C mutation in a high mutation load in muscle and blood. No histological abnormality was found. In 9 out of 11 patients a decreased ATP production was detected, and complex V activity was deficient in all children. The activities of the respiratory enzyme complexes II and IV were normal, whereas an associated combined complex I and III deficiency were present in two patients. No obvious difference was found between the biochemical parameters of the two patient groups harboring different mutations in the same gene. No correlation was found between the degree of complex V enzyme deficiency and the severity of the phenotype. We confirmed an impaired assembly/stability of complex V in our patients. This is the first report of decreased activity and impaired assembly/stability of complex V in patients with T8993C mutations measured in muscle tissue.
Collapse
Affiliation(s)
- Eva Morava
- Department of Pediatrics, Radboud University Nijmegen Medical Centre, Nijmegen Centre for Mitochondrial Disorders, Nijmegen, The Netherlands.
| | | | | | | | | | | | | | | |
Collapse
|
32
|
Distelmaier F, Visch HJ, Smeitink JAM, Mayatepek E, Koopman WJH, Willems PHGM. The antioxidant Trolox restores mitochondrial membrane potential and Ca2+ -stimulated ATP production in human complex I deficiency. J Mol Med (Berl) 2009; 87:515-22. [PMID: 19255735 PMCID: PMC2836243 DOI: 10.1007/s00109-009-0452-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2008] [Revised: 01/22/2009] [Accepted: 02/10/2009] [Indexed: 11/29/2022]
Abstract
Malfunction of mitochondrial complex I caused by nuclear gene mutations causes early-onset neurodegenerative diseases. Previous work using cultured fibroblasts of complex-I-deficient patients revealed elevated levels of reactive oxygen species (ROS) and reductions in both total Ca(2+) content of the endoplasmic reticulum (ER(Ca)) and bradykinin(Bk)-induced increases in cytosolic and mitochondrial free Ca(2+) ([Ca(2+)](C); [Ca(2+)](M)) and ATP ([ATP](C); [ATP](M)) concentration. Here, we determined the mitochondrial membrane potential (Delta psi) in patient skin fibroblasts and show significant correlations with cellular ROS levels and ER(Ca), i.e., the less negative Delta psi, the higher these levels and the lower ER(Ca). Treatment with 6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid (Trolox) normalized Delta psi and Bk-induced increases in [Ca(2+)](M) and [ATP](M). These effects were accompanied by an increase in ER(Ca) and Bk-induced increase in [Ca(2+)](C). Together, these results provide evidence for an integral role of increased ROS levels in complex I deficiency and point to the potential therapeutic value of antioxidant treatment.
Collapse
Affiliation(s)
- Felix Distelmaier
- Department of Biochemistry (286), Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
| | | | | | | | | | | |
Collapse
|
33
|
Willems PHGM, Smeitink JAM, Koopman WJH. Mitochondrial dynamics in human NADH:ubiquinone oxidoreductase deficiency. Int J Biochem Cell Biol 2009; 41:1773-82. [PMID: 19703648 DOI: 10.1016/j.biocel.2009.01.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Revised: 01/12/2009] [Accepted: 01/15/2009] [Indexed: 10/21/2022]
Abstract
Mitochondrial NADH:ubiquinone oxidoreductase or complex I (CI) is a frequently affected enzyme in cases of mitochondrial disorders. However, the cytopathological mechanism of the associated pediatric syndromes is poorly understood. Evidence in the literature suggests a connection between mitochondrial metabolism and morphology. Previous quantitative analysis of mitochondrial structure in cultured fibroblasts of 14 patients revealed that mitochondria were fragmented and/or less branched in patients with severe CI deficiency. These patient cells also displayed greatly increased levels of reactive oxygen species (ROS) and marked aberrations in mitochondrial and cellular Ca(2+)/ATP handling upon hormone stimulation. Here, we discuss the interrelationship between these parameters and demonstrate that the hormone-induced increase in mitochondrial Ca(2+) and ATP concentration, as well as the rate of cytosolic Ca(2+) removal, are not related to mitochondrial length and/or degree of branching, but decrease as a function of the number of mitochondria per cell. This suggests that the amount of mitochondria, and not their shape, is important for Ca(2+)-induced stimulation of mitochondrial ATP generation to feed cytosolic ATP-demanding processes.
Collapse
Affiliation(s)
- Peter H G M Willems
- Department of Biochemistry, Nijmegen Centre for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | | | | |
Collapse
|
34
|
Jonckheere AI, Hogeveen M, Nijtmans L, van den Brand M, Janssen A, Diepstra H, van den Brandt F, van den Heuvel B, Hol F, Hofste T, Kapusta L, Dillmann U, Shamdeen M, Smeitink J, Smeitink J, Rodenburg R. A novel mitochondrial ATP8 gene mutation in a patient with apical hypertrophic cardiomyopathy and neuropathy. BMJ Case Rep 2009; 2009:bcr07.2008.0504. [PMID: 21686774 PMCID: PMC3027703 DOI: 10.1136/bcr.07.2008.0504] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
To identify the biochemical and molecular genetic defect in a 16-year-old patient presenting with apical hypertrophic cardiomyopathy and neuropathy suspected for a mitochondrial disorder.Measurement of the mitochondrial energy-generating system (MEGS) capacity in muscle and enzyme analysis in muscle and fibroblasts were performed. Relevant parts of the mitochondrial DNA were analysed by sequencing.A homoplasmic nonsense mutation m.8529G→A (p.Trp55X) was found in the mitochondrial ATP8 gene in the patient's fibroblasts and muscle tissue. Reduced complex V activity was measured in the patient's fibroblasts and muscle tissue, and was confirmed in cybrid clones containing patient-derived mitochondrial DNAWe describe the first pathogenic mutation in the mitochondrial ATP8 gene, resulting in an improper assembly and reduced activity of the complex V holoenzyme.
Collapse
Affiliation(s)
- An I Jonckheere
- Geert Grooteplein 10 PO Box 9101, 6500 HB Nijmegen, Netherlands
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
de Vries MC, Rodenburg RJ, Morava E, Lammens M, van den Heuvel LPW, Korenke GC, Smeitink JAM. Normal biochemical analysis of the oxidative phosphorylation (OXPHOS) system in a child with POLG mutations: a cautionary note. J Inherit Metab Dis 2008; 31 Suppl 2:S299-302. [PMID: 18500570 DOI: 10.1007/s10545-008-0871-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Revised: 03/25/2008] [Accepted: 04/03/2008] [Indexed: 11/24/2022]
Abstract
We report a 5-year-old child carrying polymerase gamma (POLG1) mutations, but strikingly normal oxidative phosphorylation analysis in muscle, fibroblasts and liver. Mutations in POLG1 have so far been described in children with severe combined oxidative phosphorylation (OXPHOS) deficiencies and with the classical Alpers-Huttenlocher syndrome. The patient presented with a delayed psychomotor development and ataxia during the first two years of life. From the third year of life he developed epilepsy and regression in development, together with symptoms of visual impairment and sensorineuronal deafness. Cerebrospinal fluid showed elevated lactic acid and protein concentrations. An elder brother had died due to combined OXPHOS deficiencies. Despite the clinical similarity with the elder brother, except for liver involvement, the OXPHOS system analysis in a frozen muscle biopsy was normal. For this reason a fresh muscle biopsy was performed, which has the advantage of the possibility of measuring the substrate oxidation rates and ATP production, part of the mitochondrial energy-generating system (MEGS). During the same session, biopsies of liver and fibroblasts were taken. These three tissues showed normal measurements of the MEGS capacity. Based on the phenotype of Alpers-Huttenlocher syndrome in the elder brother, we decided to screen the POLG1 gene. Mutation analysis showed compound heterozygosity with two known mutations, A467T and G848S. The normal MEGS capacity in this patient expands the already existing complexity and heterogeneity of the childhood POLG1 patients and, on the basis of the high frequency of POLG1 mutations in childhood, warrants a liberal strategy with respect to mutation analysis.
Collapse
Affiliation(s)
- M C de Vries
- Nijmegen Centre for Mitochondrial Disorders at Department of Pediatrics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
| | | | | | | | | | | | | |
Collapse
|
36
|
Wang HQ, Imai Y, Inoue H, Kataoka A, Iita S, Nukina N, Takahashi R. Pael-R transgenic mice crossed with parkin deficient mice displayed progressive and selective catecholaminergic neuronal loss. J Neurochem 2008; 107:171-85. [DOI: 10.1111/j.1471-4159.2008.05607.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
37
|
Comparative genomics of the oxidative phosphorylation system in fungi. Fungal Genet Biol 2008; 45:1248-56. [DOI: 10.1016/j.fgb.2008.06.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 04/29/2008] [Accepted: 06/18/2008] [Indexed: 11/22/2022]
|
38
|
Koopman WJ, Verkaart S, van Emst-de Vries SE, Grefte S, Smeitink JA, Nijtmans LG, Willems PH. Mitigation of NADH: Ubiquinone oxidoreductase deficiency by chronic Trolox treatment. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2008; 1777:853-9. [DOI: 10.1016/j.bbabio.2008.03.028] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2008] [Revised: 03/04/2008] [Accepted: 03/19/2008] [Indexed: 12/21/2022]
|
39
|
Assembly of the oxidative phosphorylation system in humans: what we have learned by studying its defects. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2008; 1793:200-11. [PMID: 18620006 DOI: 10.1016/j.bbamcr.2008.05.028] [Citation(s) in RCA: 158] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Revised: 05/12/2008] [Accepted: 05/17/2008] [Indexed: 02/07/2023]
Abstract
Assembly of the oxidative phosphorylation (OXPHOS) system in the mitochondrial inner membrane is an intricate process in which many factors must interact. The OXPHOS system is composed of four respiratory chain complexes, which are responsible for electron transport and generation of the proton gradient in the mitochondrial intermembrane space, and of the ATP synthase that uses this proton gradient to produce ATP. Mitochondrial human disorders are caused by dysfunction of the OXPHOS system, and many of them are associated with altered assembly of one or more components of the OXPHOS system. The study of assembly defects in patients has been useful in unraveling and/or gaining a complete understanding of the processes by which these large multimeric complexes are formed. We review here current knowledge of the biogenesis of OXPHOS complexes based on investigation of the corresponding disorders.
Collapse
|
40
|
Eukaryotic complex I: functional diversity and experimental systems to unravel the assembly process. Mol Genet Genomics 2008; 280:93-110. [DOI: 10.1007/s00438-008-0350-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2008] [Accepted: 05/01/2008] [Indexed: 10/21/2022]
|
41
|
Hoefs SJG, Dieteren CEJ, Distelmaier F, Janssen RJRJ, Epplen A, Swarts HGP, Forkink M, Rodenburg RJ, Nijtmans LG, Willems PH, Smeitink JAM, van den Heuvel LP. NDUFA2 complex I mutation leads to Leigh disease. Am J Hum Genet 2008; 82:1306-15. [PMID: 18513682 DOI: 10.1016/j.ajhg.2008.05.007] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2008] [Revised: 04/29/2008] [Accepted: 05/13/2008] [Indexed: 01/21/2023] Open
Abstract
Mitochondrial isolated complex I deficiency is the most frequently encountered OXPHOS defect. We report a patient with an isolated complex I deficiency expressed in skin fibroblasts as well as muscle tissue. Because the parents were consanguineous, we performed homozygosity mapping to identify homozygous regions containing candidate genes such as NDUFA2 on chromosome 5. Screening of this gene on genomic DNA revealed a mutation that interferes with correct splicing and results in the skipping of exon 2. Exon skipping was confirmed on the mRNA level. The mutation in this accessory subunit causes reduced activity and disturbed assembly of complex I. Furthermore, the mutation is associated with a mitochondrial depolarization. The expression and activity of complex I and the depolarization was (partially) rescued with a baculovirus system expressing the NDUFA2 gene.
Collapse
Affiliation(s)
- Saskia J G Hoefs
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen 6500 HB, The Netherlands
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Koopman WJH, Distelmaier F, Hink MA, Verkaart S, Wijers M, Fransen J, Smeitink JAM, Willems PHGM. Inherited complex I deficiency is associated with faster protein diffusion in the matrix of moving mitochondria. Am J Physiol Cell Physiol 2008; 294:C1124-32. [DOI: 10.1152/ajpcell.00079.2008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mitochondria continuously change shape, position, and matrix configuration for optimal metabolite exchange. It is well established that changes in mitochondrial metabolism influence mitochondrial shape and matrix configuration. We demonstrated previously that inhibition of mitochondrial complex I (CI or NADH:ubiquinone oxidoreductase) by rotenone accelerated matrix protein diffusion and decreased the fraction and velocity of moving mitochondria. In the present study, we investigated the relationship between inherited CI deficiency, mitochondrial shape, mobility, and matrix protein diffusion. To this end, we analyzed fibroblasts of two children that represented opposite extremes in a cohort of 16 patients, with respect to their residual CI activity and mitochondrial shape. Fluorescence correlation spectroscopy (FCS) revealed no relationship between residual CI activity, mitochondrial shape, the fraction of moving mitochondria, their velocity, and the rate of matrix-targeted enhanced yellow fluorescent protein (mitoEYFP) diffusion. However, mitochondrial velocity and matrix protein diffusion in moving mitochondria were two to three times higher in patient cells than in control cells. Nocodazole inhibited mitochondrial movement without altering matrix EYFP diffusion, suggesting that both activities are mutually independent. Unexpectedly, electron microscopy analysis revealed no differences in mitochondrial ultrastructure between control and patient cells. It is discussed that the matrix of a moving mitochondrion in the CI-deficient state becomes less dense, allowing faster metabolite diffusion, and that fibroblasts of CI-deficient patients become more glycolytic, allowing a higher mitochondrial velocity.
Collapse
|
43
|
Kruse SE, Watt WC, Marcinek DJ, Kapur RP, Schenkman KA, Palmiter RD. Mice with mitochondrial complex I deficiency develop a fatal encephalomyopathy. Cell Metab 2008; 7:312-20. [PMID: 18396137 PMCID: PMC2593686 DOI: 10.1016/j.cmet.2008.02.004] [Citation(s) in RCA: 293] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Revised: 12/09/2007] [Accepted: 02/08/2008] [Indexed: 01/12/2023]
Abstract
To study effects of mitochondrial complex I (CI, NADH:ubiquinone oxidoreductase) deficiency, we inactivated the Ndufs4 gene, which encodes an 18 kDa subunit of the 45-protein CI complex. Although small, Ndufs4 knockout (KO) mice appeared healthy until approximately 5 weeks of age, when ataxic signs began, progressing to death at approximately 7 weeks. KO mice manifested encephalomyopathy including a retarded growth rate, lethargy, loss of motor skill, blindness, and elevated serum lactate. CI activity in submitochondrial particles from KO mice was undetectable by spectrophotometric assays. However, CI-driven oxygen consumption by intact tissue was about half that of controls. Native gel electrophoresis revealed reduced levels of intact CI. These data suggest that CI fails to assemble properly or is unstable without NDUFS4. KO muscle has normal morphology but low NADH dehydrogenase activity and subsarcolemmal aggregates of mitochondria. Nonetheless, total oxygen consumption and muscle ATP and phosphocreatine concentrations measured in vivo were within normal parameters.
Collapse
Affiliation(s)
- Shane E Kruse
- Howard Hughes Medical Institute and Department of Biochemistry, University of Washington, Seattle, WA 98195, USA
| | | | | | | | | | | |
Collapse
|
44
|
Verkaart S, Koopman WJH, Cheek J, van Emst-de Vries SE, van den Heuvel LWPJ, Smeitink JAM, Willems PHGM. Mitochondrial and cytosolic thiol redox state are not detectably altered in isolated human NADH:ubiquinone oxidoreductase deficiency. Biochim Biophys Acta Mol Basis Dis 2007; 1772:1041-51. [PMID: 17600689 DOI: 10.1016/j.bbadis.2007.05.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2007] [Revised: 05/15/2007] [Accepted: 05/15/2007] [Indexed: 01/22/2023]
Abstract
Isolated complex I deficiency is the most common enzymatic defect of the oxidative phosphorylation (OXPHOS) system, causing a wide range of clinical phenotypes. We reported before that the rates at which reactive oxygen species (ROS)-sensitive dyes are converted into their fluorescent oxidation products are markedly increased in cultured skin fibroblasts of patients with nuclear-inherited isolated complex I deficiency. Using video-imaging microscopy we show here that these cells also display a marked increase in NAD(P)H autofluorescence. Linear regression analysis revealed a negative correlation with the residual complex I activity and a positive correlation with the oxidation rates of the ROS-sensitive dyes 5-(and-6)-chloromethyl-2',7'-dichlorodihydrofluorescein and hydroethidine for a cohort of 10 patient cell lines. On the other hand, video-imaging microscopy of cells expressing reduction-oxidation sensitive GFP1 in either the mitochondrial matrix or cytosol showed the absence of any detectable change in thiol redox state. In agreement with this result, neither the glutathione nor the glutathione disulfide content differed significantly between patient and healthy fibroblasts. Finally, video-rate confocal microscopy of cells loaded with C11-BODIPY(581/591) demonstrated that the extent of lipid peroxidation, which is regarded as a measure of oxidative damage, was not altered in patient fibroblasts. Our results indicate that fibroblasts of patients with isolated complex I deficiency maintain their thiol redox state despite marked increases in ROS production.
Collapse
Affiliation(s)
- Sjoerd Verkaart
- Department of Membrane Biochemistry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | | | | | | | | | | | | |
Collapse
|
45
|
Lopes R, Solter PF, Sisson DD, Oyama MA, Prosek R. Correlation of mitochondrial protein expression in complexes I to V with natural and induced forms of canine idiopathic dilated cardiomyopathy. Am J Vet Res 2007; 67:971-7. [PMID: 16740089 DOI: 10.2460/ajvr.67.6.971] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To identify qualitative and quantitative differences in cardiac mitochondrial protein expression in complexes I to V between healthy dogs and dogs with natural or induced dilated cardiomyopathy (DCM). SAMPLE POPULATION Left ventricle samples were obtained from 7 healthy dogs, 7 Doberman Pinschers with naturally occurring DCM, and 7 dogs with DCM induced by rapid right ventricular pacing. PROCEDURES Fresh and frozen mitochondrial fractions were isolated from the left ventricular free wall and analyzed by 2-dimensional electrophoresis. Protein spots that increased or decreased in density by 2-fold or greater between groups were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry or quadrupole selecting, quadrupole collision cell, time-of-flight mass spectrometry. RESULTS A total of 22 altered mitochondrial proteins were identified in complexes I to V. Ten and 12 were found in complex I and complexes II to V, respectively. Five were mitochondrial encoded, and 17 were nuclear encoded. Most altered mitochondrial proteins in tissue specimens from dogs with naturally occurring DCM were associated with complexes I and V, whereas in tissue specimens from dogs subjected to rapid ventricular pacing, complexes I and IV were more affected. In the experimentally induced form of DCM, only nuclear-encoded subunits were changed in complex I. In both disease groups, the 22-kd subunit was downregulated. CONCLUSIONS AND CLINICAL RELEVANCE Natural and induced forms of DCM resulted in altered mitochondrial protein expression in complexes I to V. However, subcellular differences between the experimental and naturally occurring forms of DCM may exist.
Collapse
Affiliation(s)
- Rosana Lopes
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA
| | | | | | | | | |
Collapse
|
46
|
Lopes R, Solter PF, Sisson DD, Oyama MA, Prosek R. Characterization of canine mitochondrial protein expression in natural and induced forms of idiopathic dilated cardiomyopathy. Am J Vet Res 2007; 67:963-70. [PMID: 16740088 DOI: 10.2460/ajvr.67.6.963] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To map canine mitochondrial proteins and identify qualitative and quantitative differences in heart mitochondrial protein expression between healthy dogs and dogs with naturally occurring and induced dilated cardiomyopathy (DCM). SAMPLE POPULATION Left ventricle samples were obtained from 7 healthy dogs, 7 Doberman Pinschers with naturally occurring DCM, and 7 dogs with induced DCM. PROCEDURES Fresh and frozen mitochondrial fractions were isolated from the left ventricular free wall and analyzed by 2-dimensional electrophoresis. Protein spots that increased or decreased in density by >or= 2-fold between groups were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry or quadrupole selecting, quadrupole collision cell, time-of-flight mass spectrometry. RESULTS Within narrow pH gradients of control canine heart mitochondrial samples, a total of 1,528 protein spots were revealed. Forty subunits of heart mitochondrial proteins that differ significantly from control tissues were altered in tissue specimens from dogs with naturally occurring and induced forms of DCM. The most affected heart mitochondrial proteins in both groups were those of oxidative phosphorylation (55%). Upregulation of manganese superoxide dismutase was suggestive of heart oxidative injury in tissue specimens from dogs with both forms of DCM. Evidence of apoptosis was associated with overexpression of the heart mitochondrial voltage-dependent anion channel-2 protein and endonuclease G in tissue specimens from dogs with induced DCM. CONCLUSIONS AND CLINICAL RELEVANCE Alterations of heart mitochondrial proteins related to oxidative phosphorylation dysfunction were more prevalent in tissue specimens from dogs with induced or naturally occurring DCM, compared with those of control dogs.
Collapse
Affiliation(s)
- Rosana Lopes
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA
| | | | | | | | | |
Collapse
|
47
|
Fernandez-Moreira D, Ugalde C, Smeets R, Rodenburg RJT, Lopez-Laso E, Ruiz-Falco ML, Briones P, Martin MA, Smeitink JAM, Arenas J. X-linked NDUFA1 gene mutations associated with mitochondrial encephalomyopathy. Ann Neurol 2007; 61:73-83. [PMID: 17262856 DOI: 10.1002/ana.21036] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE Mitochondrial complex I deficiency is the commonest diagnosed respiratory chain defect, being genetically heterogeneous. The male preponderance of previous patient cohorts suggested an X-linked underlying genetic defect. We investigated mutations in the X-chromosomal complex I structural genes, NDUFA1 and NDUFB11, as a novel cause of mitochondrial encephalomyopathy. METHODS We sequenced 12 nuclear genes and the mitochondrial DNA-encoded complex I genes in 26 patients with respiratory chain complex I defect. Novel mutations were confirmed by polymerase chain reaction restriction length polymorphism. Assembly/stability studies in fibroblasts were performed using two-dimensional blue native gel electrophoresis. RESULTS Two novel p.Gly8Arg and p.Arg37Ser hemizygous mutations in NDUFA1 were identified in two unrelated male patients presenting with Leigh's syndrome and with myoclonic epilepsy and developmental delay, respectively. Two-dimensional blue native gel electrophoresis showed decreased levels of intact complex I with no accumulation of lower molecular weight subcomplexes, indicating that assembly, stability, or both are compromised. INTERPRETATION Mutations in the X-linked NDUFA1 gene result in complex I defect and encephalomyopathy. Assembly/stability analysis might give an explanation for the different clinical phenotypes and become useful for future diagnostic purposes.
Collapse
|
48
|
de Vries MC, Rodenburg RJ, Morava E, van Kaauwen EPM, ter Laak H, Mullaart RA, Snoeck IN, van Hasselt PM, Harding P, van den Heuvel LPW, Smeitink JAM. Multiple oxidative phosphorylation deficiencies in severe childhood multi-system disorders due to polymerase gamma (POLG1) mutations. Eur J Pediatr 2007; 166:229-34. [PMID: 16957900 DOI: 10.1007/s00431-006-0234-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2006] [Revised: 06/26/2006] [Accepted: 06/27/2006] [Indexed: 10/24/2022]
Abstract
Failure to thrive, feeding difficulties, variable forms of infantile epilepsy or psychomotor developmental delay and hypotonia were the most frequent clinical disease presentations in eight children with combined oxidative phosphorylation enzyme complex deficiencies carrying mutations in the polymerase gamma (POLG1) gene. Five out of eight patients developed severe liver dysfunction during the course of the disease. Three of these patients fulfilled the disease criteria for Alpers syndrome. Most children showed deficiencies of respiratory chain enzyme complexes I and III, in combination with complex II, complex IV and/or PDHc in muscle, whereas in fibroblasts normal enzyme activities were measured. All children carried homozygous or compound heterozygous mutations in the POLG1 gene, including two novel mutations in association with mtDNA depletion. Conclusion We suggest performing POLG1 mutation analysis in children with combined oxidative phosphorylation deficiencies in muscle, even if the clinical picture is not Alpers syndrome.
Collapse
Affiliation(s)
- Maaike C de Vries
- Nijmegen Centre for Mitochondrial Disorders, Departments of Pediatrics, Laboratory of Pediatrics and Neurology and Department of Pathology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Verkaart S, Koopman WJH, van Emst-de Vries SE, Nijtmans LGJ, van den Heuvel LWPJ, Smeitink JAM, Willems PHGM. Superoxide production is inversely related to complex I activity in inherited complex I deficiency. Biochim Biophys Acta Mol Basis Dis 2007; 1772:373-81. [PMID: 17289351 DOI: 10.1016/j.bbadis.2006.12.009] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2006] [Revised: 12/16/2006] [Accepted: 12/18/2006] [Indexed: 11/26/2022]
Abstract
Deficiency of NADH:ubiquinone oxidoreductase or complex I (CI) is the most common cause of disorders of the oxidative phosphorylation system in humans. Using life cell imaging and blue-native electrophoresis we quantitatively compared superoxide production and CI amount and activity in cultured skin fibroblasts of 7 healthy control subjects and 21 children with inherited isolated CI deficiency. Thirteen children had a disease causing mutation in one of the nuclear-encoded CI subunits, whereas in the remainder the genetic cause of the disease is not yet established. Superoxide production was significantly increased in all but two of the patient cell lines. An inverse relationship with the amount and residual activity of CI was observed. In agreement with this finding, rotenone, a potent inhibitor of CI activity, dose-dependently increased superoxide production in healthy control cells. Also in this case an inverse relationship with the residual activity of CI was observed. In sharp contrast, however, rotenone did not decrease the amount of CI. The data presented show that superoxide production is increased in inherited CI deficiency and that this increase is primarily a consequence of the reduction in cellular CI activity and not of a further leakage of electrons from mutationally malformed complexes.
Collapse
Affiliation(s)
- Sjoerd Verkaart
- Department of Membrane Biochemistry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | | | | | | | | | | | | |
Collapse
|
50
|
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]
|