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Baglioni V, Bozza F, Lentini G, Beatrice A, Cameli N, Colacino Cinnante EM, Terrinoni A, Nardecchia F, Pisani F. Psychiatric Manifestations in Children and Adolescents with Inherited Metabolic Diseases. J Clin Med 2024; 13:2190. [PMID: 38673463 PMCID: PMC11051134 DOI: 10.3390/jcm13082190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 03/24/2024] [Accepted: 04/05/2024] [Indexed: 04/28/2024] Open
Abstract
Background: Inherited metabolic disorders (IEMs) can be represented in children and adolescents by psychiatric disorders. The early diagnosis of IEMs is crucial for clinical outcome and treatment. The aim of this review is to analyze the most recurrent and specific psychiatric features related to IEMs in pediatrics, based on the onset type and psychiatric phenotypes. Methods: Following the PRISMA Statement, a systematic literature review was performed using a predefined algorithm to find suitable publications in scientific databases of interest. After removing duplicates and screening titles and abstracts, suitable papers were analyzed and screened for inclusion and exclusion criteria. Finally, the data of interest were retrieved from the remaining articles. Results: The results of this study are reported by type of symptoms onset (acute and chronic) and by possible psychiatric features related to IEMs. Psychiatric phenomenology has been grouped into five main clinical manifestations: mood and anxiety disorders; schizophrenia-spectrum disorders; catatonia; eating disorders; and self-injurious behaviors. Conclusions: The inclusion of a variety of psychiatric manifestations in children and adolescents with different IEMs is a key strength of this study, which allowed us to explore the facets of seemingly different disorders in depth, avoiding possible misdiagnoses, with the related delay of early and appropriate treatments.
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Affiliation(s)
| | - Fabiola Bozza
- Child Neurology and Psychiatry Unit, Department of Human Neuroscience, Sapienza University, Via dei Sabelli 108, 00185 Rome, Italy; (V.B.); (G.L.); (A.B.); (N.C.); (E.M.C.C.); (A.T.); (F.N.); (F.P.)
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Kalkan Uçar S, Yazıcı H, Canda E, Er E, Bulut FD, Eraslan C, Onay H, Bax BE, Çoker M. Clinical spectrum of early onset "Mediterranean" (homozygous p.P131L mutation) mitochondrial neurogastrointestinal encephalomyopathy. JIMD Rep 2022; 63:484-493. [PMID: 36101829 PMCID: PMC9458607 DOI: 10.1002/jmd2.12315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/17/2022] [Accepted: 06/23/2022] [Indexed: 11/25/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an autosomal recessive mitochondrial disorder characterized by cumulative and progressive gastrointestinal and neurological findings. This retrospective observational study, aimed to explore the time of presentation, diagnosis and clinical follow-up of 13 patients with a confirmed MNGIE disease of Mediterranean origin. The mean age of symptom onset was 7 years (6 months-21 years) and the average diagnosis age was 15.4 years ±8.4. Four of 13 patients (30%) died before 30 years at the mean age of 19.7 years ±6.8. Cachexia and gastrointestinal symptoms were observed in all patients (100%). The mean body mass index standard deviation score at diagnosis was 4.8 ± 2.8. At least three subocclusive episodes were presented in patients who died in last year of their life. The main neurological symptom found in most patients was peripheral neuropathy (92%). Ten patients (77%) had leukoencephalopathy and the remaining three patients without were under 10 years of age. The new homozygous "Mediterranean" TYMP mutation, p.P131L (c.392 C > T) was associated with an early presentation and poor prognosis in nine patients (69%) from five separates families. Based on the observations from this Mediterranean MNGIE cohort, we propose that the unexplained abdominal pain combined with cachexia is an indicator of MNGIE. High-platelet counts and nerve conduction studies may be supportive laboratory findings and the frequent subocclusive episodes could be a negative prognostic factor for mortality. Finally, the homozygous p.P131L (c.392 C > T) mutation could be associated with rapid progressive disease with poor prognosis.
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Affiliation(s)
- Sema Kalkan Uçar
- Department of Pediatrics, Division of Metabolism and NutritionEge University Medical FacultyIzmirTurkey
| | - Havva Yazıcı
- Department of Pediatrics, Division of Metabolism and NutritionEge University Medical FacultyIzmirTurkey
| | - Ebru Canda
- Department of Pediatrics, Division of Metabolism and NutritionEge University Medical FacultyIzmirTurkey
| | - Esra Er
- Department of Pediatrics, Division of Metabolism and NutritionEge University Medical FacultyIzmirTurkey
| | - Fatma Derya Bulut
- Department of Pediatrics, Division of Metabolism and NutritionÇukurova University Medical FacultyAdanaTurkey
| | - Cenk Eraslan
- Department of Radiology, Division of NeuroradiologyEge University Medical FacultyBornovaTurkey
| | - Hüseyin Onay
- Department of GeneticsEge University Medical FacultyIzmirTurkey
| | - Bridget Elizabeth Bax
- Institute of Molecular and Clinical SciencesSt George's University of LondonLondonUK
| | - Mahmut Çoker
- Department of Pediatrics, Division of Metabolism and NutritionEge University Medical FacultyIzmirTurkey
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3
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Almannai M, El-Hattab AW, Azamian MS, Ali M, Scaglia F. Mitochondrial DNA maintenance defects: potential therapeutic strategies. Mol Genet Metab 2022; 137:40-48. [PMID: 35914366 PMCID: PMC10401187 DOI: 10.1016/j.ymgme.2022.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 07/03/2022] [Accepted: 07/03/2022] [Indexed: 10/17/2022]
Abstract
Mitochondrial DNA (mtDNA) replication depends on the mitochondrial import of hundreds of nuclear encoded proteins that control the mitochondrial genome maintenance and integrity. Defects in these processes result in an expanding group of disorders called mtDNA maintenance defects that are characterized by mtDNA depletion and/or multiple mtDNA deletions with variable phenotypic manifestations. As it applies for mitochondrial disorders in general, current treatment options for mtDNA maintenance defects are limited. Lately, with the development of model organisms, improved understanding of the pathophysiology of these disorders, and a better knowledge of their natural history, the number of preclinical studies and existing and planned clinical trials has been increasing. In this review, we discuss recent preclinical studies and current and future clinical trials concerning potential therapeutic options for the different mtDNA maintenance defects.
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Affiliation(s)
- Mohammed Almannai
- Genetics and Precision Medicine Department (GPM), King Abdullah Specialized Children's Hospital (KASCH), King Abdulaziz Medical City, Ministry of National Guard Health Affairs (MNG-HA), Riyadh, Saudi Arabia
| | - Ayman W El-Hattab
- Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Mahshid S Azamian
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - May Ali
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Fernando Scaglia
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, Houston, TX, USA; Joint BCM-CUHK Center of Medical Genetics, Prince of Wales Hospital, Shatin, Hong Kong.
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4
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Shah SAY, Shakeel HA, Hassan WU. Rare pathogenic mutation in the thymidine phosphorylase gene (TYMP) causing mitochondrial neurogastrointestinal encephalomyelopathy. BMJ Neurol Open 2022; 4:e000287. [PMID: 36072350 PMCID: PMC9403154 DOI: 10.1136/bmjno-2022-000287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2022] [Indexed: 11/29/2022] Open
Abstract
Background Mitochondrial neurogastrointestinal encephalopathy (MNGIE) disease is a rare multisystem disorder that mainly affects the digestive and nervous systems. Key features of the disease include cachexia, ptosis, external ophthalmoplegia, peripheral neuropathy and leucoencephalopathy. Symptoms most often begin by age 20 and overlap several other Metabolic and endocrine disorders making the diagnosis challenging. It has been determined that MNGIE is caused by mutations in the gene-encoding thymidine phosphorylase (TP; previously known as endothelial cell growth factor 1). Case We herein present the clinical, neuroimaging and molecular findings in a patient with MNGIE caused by a novel homozygous variant of TYMP gene c.1048C>T, which is predicted to result in a premature protein termination (p.Gln350*). TYMP is a gene on chromosome 22q13.33 that encodes TP. Conclusion This case highlights the importance of good understanding and early recognition of a rare condition like MNGIE, so that the suffering from unnecessary interventional procedures can be avoided and better multidisciplinary care can be implemented for the symptomatic management of the patient.
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Affiliation(s)
| | | | - Wajih Ul Hassan
- Medicine, Nishtar Medical College and Hospital, Multan, Pakistan
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5
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Gopan A, Sarma MS. Mitochondrial hepatopathy: Respiratory chain disorders- ‘breathing in and out of the liver’. World J Hepatol 2021; 13:1707-1726. [PMID: 34904040 PMCID: PMC8637684 DOI: 10.4254/wjh.v13.i11.1707] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/30/2021] [Accepted: 08/18/2021] [Indexed: 02/06/2023] Open
Abstract
Mitochondria, the powerhouse of a cell, are closely linked to the pathophysiology of various common as well as not so uncommon disorders of the liver and beyond. Evolution supports a prokaryotic descent, and, unsurprisingly, the organelle is worthy of being labeled an organism in itself. Since highly metabolically active organs require a continuous feed of energy, any dysfunction in the structure and function of mitochondria can have variable impact, with the worse end of the spectrum producing catastrophic consequences with a multisystem predisposition. Though categorized a hepatopathy, mitochondrial respiratory chain defects are not limited to the liver in time and space. The liver involvement is also variable in clinical presentation as well as in age of onset, from acute liver failure, cholestasis, or chronic liver disease. Other organs like eye, muscle, central and peripheral nervous system, gastrointestinal tract, hematological, endocrine, and renal systems are also variably involved. Diagnosis hinges on recognition of subtle clinical clues, screening metabolic investigations, evaluation of the extra-hepatic involvement, and role of genetics and tissue diagnosis. Treatment is aimed at both circumventing the acute metabolic crisis and long-term management including nutritional rehabilitation. This review lists and discusses the burden of mitochondrial respiratory chain defects, including various settings when to suspect, their evolution with time, including certain specific disorders, their tiered evaluation with diagnostic algorithms, management dilemmas, role of liver transplantation, and the future research tools.
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Affiliation(s)
- Amrit Gopan
- Department of Gastroenterology, Seth G.S Medical College and K.E.M Hospital, Mumbai 400012, India
| | - Moinak Sen Sarma
- Department of Pediatric Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226014, India
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6
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Parés M, Fornaguera C, Vila-Julià F, Oh S, Fan SHY, Tam YK, Comes N, Vidal F, Martí R, Borrós S, Barquinero J. Preclinical Assessment of a Gene-Editing Approach in a Mouse Model of Mitochondrial Neurogastrointestinal Encephalomyopathy. Hum Gene Ther 2021; 32:1210-1223. [PMID: 34498979 DOI: 10.1089/hum.2021.152] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a rare disease caused by recessive mutations in the TYMP gene, which encodes the enzyme thymidine phosphorylase (TP). In this study, the efficient integration of a TYMP transgene into introns of the Tymp and Alb loci of hepatocytes in a murine model of MNGIE was achieved by the coordinated delivery and activity of CRISPR/Cas9 and a TYMP cDNA. CRISPR/Cas9 was delivered either as mRNA using lipid nanoparticle (LNP) or polymeric nanoparticle, respectively, or in an AAV2/8 viral vector; the latter was also used to package the TYMP cDNA. Insertion of the cDNA template downstream of the Tymp and Alb promoters ensured transgene expression. The best in vivo results were obtained using LNP carrying the CRISPR/Cas9 mRNAs. Treated mice showed a consistent long-term (1 year) reduction in plasma nucleoside (thymidine and deoxyuridine) levels that correlated with the presence of TYMP mRNA and functional enzyme in liver cells. In mice with an edited Alb locus, the transgene produced a hybrid Alb-hTP protein that was secreted, with supraphysiological levels of TP activity detected in the plasma. Equivalent results were obtained in mice edited at the Tymp locus. Finally, some degree of gene editing was found in animals treated only with AAV vectors containing the DNA templates, in the absence of nucleases, although there was no impact on plasma nucleoside levels. Overall, these results demonstrate the feasibility of liver-directed genome editing in the long-term correction of MNGIE, with several advantages over other methods.
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Affiliation(s)
- Marta Parés
- Gene and Cell Therapy, Institut de Recerca Hospital Universitari Vall d'Hebron (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
| | - Cristina Fornaguera
- Grup d'Enginyeria de Materials (GEMAT), Institut Químic de Sarrià (IQS), Ramon Llull University (URL), Barcelona, Spain
| | - Ferran Vila-Julià
- Research Group on Neuromuscular and Mitochondrial Diseases, Institut de Recerca Hospital Universitari Vall d'Hebron (VHIR), Universitat Autònoma de Barcelona (UAB), and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Spain
| | - Sejin Oh
- Grup d'Enginyeria de Materials (GEMAT), Institut Químic de Sarrià (IQS), Ramon Llull University (URL), Barcelona, Spain
| | - Steven H Y Fan
- Acuitas Therapeutics, Vancouver, British Columbia, Canada
| | - Ying K Tam
- Acuitas Therapeutics, Vancouver, British Columbia, Canada
| | | | - Francisco Vidal
- Blood and Tissue Bank, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV), Madrid, Spain
| | - Ramon Martí
- Research Group on Neuromuscular and Mitochondrial Diseases, Institut de Recerca Hospital Universitari Vall d'Hebron (VHIR), Universitat Autònoma de Barcelona (UAB), and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Spain
| | - Salvador Borrós
- Grup d'Enginyeria de Materials (GEMAT), Institut Químic de Sarrià (IQS), Ramon Llull University (URL), Barcelona, Spain
| | - Jordi Barquinero
- Gene and Cell Therapy, Institut de Recerca Hospital Universitari Vall d'Hebron (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
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Ramón J, Vila-Julià F, Molina-Granada D, Molina-Berenguer M, Melià MJ, García-Arumí E, Torres-Torronteras J, Cámara Y, Martí R. Therapy Prospects for Mitochondrial DNA Maintenance Disorders. Int J Mol Sci 2021; 22:6447. [PMID: 34208592 PMCID: PMC8234938 DOI: 10.3390/ijms22126447] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 06/10/2021] [Accepted: 06/11/2021] [Indexed: 02/07/2023] Open
Abstract
Mitochondrial DNA depletion and multiple deletions syndromes (MDDS) constitute a group of mitochondrial diseases defined by dysfunctional mitochondrial DNA (mtDNA) replication and maintenance. As is the case for many other mitochondrial diseases, the options for the treatment of these disorders are rather limited today. Some aggressive treatments such as liver transplantation or allogeneic stem cell transplantation are among the few available options for patients with some forms of MDDS. However, in recent years, significant advances in our knowledge of the biochemical pathomechanisms accounting for dysfunctional mtDNA replication have been achieved, which has opened new prospects for the treatment of these often fatal diseases. Current strategies under investigation to treat MDDS range from small molecule substrate enhancement approaches to more complex treatments, such as lentiviral or adenoassociated vector-mediated gene therapy. Some of these experimental therapies have already reached the clinical phase with very promising results, however, they are hampered by the fact that these are all rare disorders and so the patient recruitment potential for clinical trials is very limited.
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Affiliation(s)
- Javier Ramón
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Ferran Vila-Julià
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - David Molina-Granada
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Miguel Molina-Berenguer
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Maria Jesús Melià
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Elena García-Arumí
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Javier Torres-Torronteras
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Yolanda Cámara
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Ramon Martí
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain; (J.R.); (F.V.-J.); (D.M.-G.); (M.M.-B.); (M.J.M.); (E.G.-A.); (J.T.-T.); (Y.C.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain
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8
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Zaidman I, Elhasid R, Gefen A, Yahav Dovrat A, Mutaz S, Shaoul R, Eshach Adiv O, Mandel H, Tal G. Hematopoietic stem cell transplantation for mitochondrial neurogastrointestinal encephalopathy: A single-center experience underscoring the multiple factors involved in the prognosis. Pediatr Blood Cancer 2021; 68:e28926. [PMID: 33533561 DOI: 10.1002/pbc.28926] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 12/21/2020] [Accepted: 01/12/2021] [Indexed: 01/01/2023]
Abstract
BACKGROUND Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a progressive autosomal recessive disorder characterized by cachexia, gastrointestinal (GI) dysmotility, ptosis, peripheral neuropathy, and brain magnetic resonance imaging (MRI) white matter changes. Bi-allelic TYMP mutations lead to deficient thymidine phosphorylase (TP) activity, toxic accumulation of plasma nucleosides (thymidine and deoxyuridine), nucleotide pool imbalances, and mitochondrial DNA (mtDNA) instability. Death is mainly due to GI complications: intestinal perforation, peritonitis, and/or liver failure. Based on our previous observations in three patients with MNGIE that platelet infusions resulted in a transient 40% reduction of plasma nucleoside levels, in 2005 we performed the first hematopoietic stem cell transplantation (HSCT) worldwide as a life-long source of TP in a patient with MNGIE. PROCEDURE HSCT was performed in a total of six patients with MNGIE. The multiple factors involved in the prognosis of this cohort were analyzed and compared to the literature experience. RESULTS Cell source was bone marrow in five patients and peripheral stem cells in one, all from fully human leukocyte antigen (HLA)-matched related donors, including four who were TYMP mutation carriers. Four of six (66%) survived compared to the 37% survival rate in the literature. Reduced intensity conditioning regimen contributed to secondary graft failure in two patients. Fifteen years post HSCT, the first transplanted patient is seemingly cured. Severe GI symptoms before transplantation were mostly irreversible and were poor prognostic factors. CONCLUSIONS Allogenic HSCT could constitute a curative therapeutic option for carefully selected, young, presymptomatic, or mildly affected patients. Timing, donor selection, and optimal conditioning protocol are major determinants of outcome. HSCT is inadvisable in patients with advanced MNGIE disease.
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Affiliation(s)
- Irina Zaidman
- Department of Bone Marrow Transplantation and Cancer Immunotherapy, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Ronit Elhasid
- Department of Hematology-Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Aharon Gefen
- Division of Pediatric Hematology Oncology and Bone Marrow Transplantation, Ruth Rappaport Children's Hospital, Rambam Medical Center, Haifa, Israel
| | | | - Sultan Mutaz
- Department of Pediatrics, Makassed Hospital, Faculty of Medicine, Al-Quds University, Jerusalem, Israel
| | - Ron Shaoul
- Gastroenterology institute, Ruth Rappaport Children's Hospital, Rambam Medical Center, Haifa, Israel.,Technion Faculty of Medicine, Haifa, Israel
| | - Orly Eshach Adiv
- Technion Faculty of Medicine, Haifa, Israel.,Pediatric Gastroenterology and Nutrition Unit, "HyllelYaffe" Medical Center, Hadera, Israel
| | - Hanna Mandel
- Technion Faculty of Medicine, Haifa, Israel.,Metabolic Clinic, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Galit Tal
- Metabolic Clinic, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel.,Pediatric B Department, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
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Hirano M, Carelli V, De Giorgio R, Pironi L, Accarino A, Cenacchi G, D’Alessandro R, Filosto M, Martí R, Nonino F, Pinna AD, Baldin E, Bax BE, Bolletta A, Bolletta R, Boschetti E, Cescon M, D’Angelo R, Dotti MT, Giordano C, Gramegna LL, Levene M, Lodi R, Mandel H, Morelli MC, Musumeci O, Pugliese A, Scarpelli M, Siniscalchi A, Spinazzola A, Tal G, Torres-Torronteras J, Vignatelli L, Zaidman I, Zoller H, Rinaldi R, Zeviani M. Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE): Position paper on diagnosis, prognosis, and treatment by the MNGIE International Network. J Inherit Metab Dis 2021; 44:376-387. [PMID: 32898308 PMCID: PMC8399867 DOI: 10.1002/jimd.12300] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 08/03/2020] [Accepted: 08/05/2020] [Indexed: 02/05/2023]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a rare autosomal recessive disease caused by TYMP mutations and thymidine phosphorylase (TP) deficiency. Thymidine and deoxyuridine accumulate impairing the mitochondrial DNA maintenance and integrity. Clinically, patients show severe and progressive gastrointestinal and neurological manifestations. The onset typically occurs in the second decade of life and mean age at death is 37 years. Signs and symptoms of MNGIE are heterogeneous and confirmatory diagnostic tests are not routinely performed by most laboratories, accounting for common misdiagnosis. Factors predictive of progression and appropriate tests for monitoring are still undefined. Several treatment options showed promising results in restoring the biochemical imbalance of MNGIE. The lack of controlled studies with appropriate follow-up accounts for the limited evidence informing diagnostic and therapeutic choices. The International Consensus Conference (ICC) on MNGIE, held in Bologna, Italy, on 30 March to 31 March 2019, aimed at an evidence-based consensus on diagnosis, prognosis, and treatment of MNGIE among experts, patients, caregivers and other stakeholders involved in caring the condition. The conference was conducted according to the National Institute of Health Consensus Conference methodology. A consensus development panel formulated a set of statements and proposed a research agenda. Specifically, the ICC produced recommendations on: (a) diagnostic pathway; (b) prognosis and the main predictors of disease progression; (c) efficacy and safety of treatments; and (f) research priorities on diagnosis, prognosis, and treatment. The Bologna ICC on diagnosis, management and treatment of MNGIE provided evidence-based guidance for clinicians incorporating patients' values and preferences.
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Affiliation(s)
- Michio Hirano
- Department of Neurology, Columbia University Irving Medical Center, New York, New York
| | - Valerio Carelli
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Italy
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Roberto De Giorgio
- Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, Italy
| | - Loris Pironi
- Clinical Nutrition and Metabolism Unit and Center for Chronic Intestinal Failure, Department of Digestive System, St. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Anna Accarino
- Digestive System Research Unit, University Hospital Vall d’Hebron / Centro de Investigación Biomédica en Red de Enfermeda des Hepáticas y Digestivas (CIBEREHD); Departament de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Giovanna Cenacchi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Italy
| | | | - Massimiliano Filosto
- Center for Neuromuscular Diseases, Unit of Neurology, Azienda Socio Sanitaria Territoriale degli Spedali Civili and University of Brescia, Brescia, Italy
| | - Ramon Martí
- Vall d’Hebron Research Institute, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Autonomous University of Barcelona, Barcelona, Spain
| | - Francesco Nonino
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | | | - Elisa Baldin
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Bridget Elizabeth Bax
- Institute of Molecular and Clinical Sciences, St George’s University of London, London, UK
| | | | | | - Elisa Boschetti
- Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Matteo Cescon
- General Surgery and Transplant Unit, Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Roberto D’Angelo
- IRCCS Istituto delle Scienze Neurologiche di Bologna, UOC Interaziendale Metropolitana (NeuroMet), - Neurologia AOU S.Orsola-Malpighi, Bologna, Italy
| | - Maria Teresa Dotti
- Neurological and Metabolic Diseases Clinic, Siena Hospital, Department of Medicine, Surgery and Neuroscience, University of Siena, Siena, Italy
| | - Carla Giordano
- Department of Radiological, Oncological and Pathological Sciences, Sapienza, University of Rome, Umberto I Policlinic, Rome, Italy
| | - Laura Ludovica Gramegna
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Italy
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Michelle Levene
- Institute of Molecular and Clinical Sciences, St George’s University of London, London, UK
| | - Raffaele Lodi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Italy
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Hanna Mandel
- Institute of Human Genetics and Inherited Metabolic Disorders, Galilee Medical Center, Nahariya, Israel
| | - Maria Cristina Morelli
- Department for Care of Organ Failures and Transplants, Internal Medicine for the Treatment of Severe Organ Failures, St. Orsola-Malpighi Hospital, Bologna, Italy
| | - Olimpia Musumeci
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Alessia Pugliese
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Mauro Scarpelli
- Neurology Unit, Department of Neuroscience, Azienda Ospedaliero Universitaria Integrata Verona, Verona, Italy
| | - Antonio Siniscalchi
- Anaesthesiology Intensive Care and Transplantation Unit, St. Orsola-Malpighi Hospital, Bologna, Italy
| | - Antonella Spinazzola
- Department of Clinical Movement Neurosciences, Royal Free Campus, University College of London, Queen Square Institute of Neurology, London, UK
| | - Galit Tal
- Metabolic Unit, Ruth Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Javier Torres-Torronteras
- Vall d’Hebron Research Institute, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Autonomous University of Barcelona, Barcelona, Spain
| | - Luca Vignatelli
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - Irina Zaidman
- Department of Bone Marrow Transplantation, Hadassah University Medical Center, Jerusalem, Israel
| | - Heinz Zoller
- Department of Internal Medicine I, Medical University of Innsbruck, Innsbruck, Austria
| | - Rita Rinaldi
- IRCCS Istituto delle Scienze Neurologiche di Bologna, UOC Interaziendale Metropolitana (NeuroMet), - Neurologia AOU S.Orsola-Malpighi, Bologna, Italy
| | - Massimo Zeviani
- Department of Neurosciences, Veneto Institute of Molecular Medicine, University of Padova, Padova, Italy
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Finsterer J. Clinical Therapeutic Management of Human Mitochondrial Disorders. Pediatr Neurol 2020; 113:66-74. [PMID: 33053453 DOI: 10.1016/j.pediatrneurol.2020.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 06/25/2020] [Accepted: 07/03/2020] [Indexed: 12/29/2022]
Abstract
Despite recent advances in the elucidation of etiology and pathogenesis of mitochondrial disorders, their therapeutic management remains challenging. This review focuses on currently available therapeutic options for human mitochondrial disorders. Current treatment of mitochondrial disorders relies on symptomatic, multidisciplinary therapies of various manifestations in organs such as the brain, muscle, nerves, eyes, ears, endocrine organs, heart, intestines, kidneys, lungs, bones, bone marrow, cartilage, immune system, and skin. If respiratory chain functions are primarily or secondarily impaired, antioxidants or cofactors should be additionally given one by one. All patients with mitochondrial disorders should be offered an individually tailored diet and physical training program. Irrespective of the pathogenesis, all patients with mitochondrial disorders should avoid exposure to mitochondrion-toxic agents and environments. Specific treatment can be offered for stroke-like episodes, mitochondrial epilepsy, mitochondrial neurogastrointestinal encephalopathy, Leber hereditary optic neuropathy, thiamine-responsive Leigh syndrome, primary coenzyme Q deficiency, primary carnitine deficiency, Friedreich ataxia, ethylmalonic encephalopathy, acyl-CoA dehydrogenase deficiency, pyruvate dehydrogenase deficiency, and hereditary vitamin E deficiency. Preventing the transmission of mitochondrial DNA-related mitochondrial disorders can be achieved by mitochondrion replacement therapy (spindle transfer, pronuclear transfer). In conclusion, specific and nonspecific therapies for human mitochondrial disorders are available, and beneficial effects have been anecdotally reported. However, double-blind, placebo-controlled studies to confirm effectiveness are lacking for the majority of the measures applied to mitochondrial disorders. Transmission of certain mitochondrial disorders can be prevented by mitochondrion replacement therapy. A multidisciplinary approach is required to meet the therapeutic challenges of patients with mitochondrial disorders.
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11
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Kripps K, Nakayuenyongsuk W, Shayota BJ, Berquist W, Gomez-Ospina N, Esquivel CO, Concepcion W, Sampson JB, Cristin DJ, Jackson WE, Gilliland S, Pomfret EA, Kueht ML, Pettit RW, Sherif YA, Emrick LT, Elsea SH, Himes R, Hirano M, Van Hove JLK, Scaglia F, Enns GM, Larson AA. Successful liver transplantation in mitochondrial neurogastrointestinal encephalomyopathy (MNGIE). Mol Genet Metab 2020; 130:58-64. [PMID: 32173240 PMCID: PMC8399858 DOI: 10.1016/j.ymgme.2020.03.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 12/19/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a fatal disorder characterized by progressive gastrointestinal dysmotility, peripheral neuropathy, leukoencephalopathy, skeletal myopathy, ophthalmoparesis, and ptosis. MNGIE stems from deficient thymidine phosphorylase activity (TP) leading to toxic elevations of plasma thymidine. Hematopoietic stem cell transplant (HSCT) restores TP activity and halts disease progression but has high transplant-related morbidity and mortality. Liver transplant (LT) was reported to restore TP activity in two adult MNGIE patients. We report successful LT in four additional MNGIE patients, including a pediatric patient. Our patients were diagnosed between ages 14 months and 36 years with elevated thymidine levels and biallelic pathogenic variants in TYMP. Two patients presented with progressive gastrointestinal dysmotility, and three demonstrated progressive peripheral neuropathy with two suffering limitations in ambulation. Two patients, including the child, had liver dysfunction and cirrhosis. Following LT, thymidine levels nearly normalized in all four patients and remained low for the duration of follow-up. Disease symptoms stabilized in all patients, with some manifesting improvements, including intestinal function. No patient died, and LT appeared to have a more favorable safety profile than HSCT, especially when liver disease is present. Follow-up studies will need to document the long-term impact of this new approach on disease outcome. Take Home Message: Liver transplantation is effective in stabilizing symptoms and nearly normalizing thymidine levels in patients with mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) and may have an improved safety profile over hematopoietic stem cell transplant.
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Affiliation(s)
- KimberlyA Kripps
- Department of Pediatrics, Section of Genetics and Metabolism, University of Colorado School of Medicine, Aurora, CO, USA
| | | | - Brian J Shayota
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - William Berquist
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Natalia Gomez-Ospina
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Carlos O Esquivel
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Waldo Concepcion
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Jacinda B Sampson
- Department of Neurology, Stanford University School of Medicine, Stanford, CA, USA
| | - David J Cristin
- Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Whitney E Jackson
- Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Samuel Gilliland
- Department of Anesthesia, University of Colorado School of Medicine, Aurora, CO, USA
| | - Elizabeth A Pomfret
- Division of Transplant Surgery, University of Colorado School of Medicine, Aurora, CO, USA
| | - Michael L Kueht
- Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Rowland W Pettit
- Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Youmna A Sherif
- Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Lisa T Emrick
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Sarah H Elsea
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Ryan Himes
- Department of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
| | - Michio Hirano
- Department of Neurology, Columbia University Medical Center, New York City, NY, USA
| | - Johan L K Van Hove
- Department of Pediatrics, Section of Genetics and Metabolism, University of Colorado School of Medicine, Aurora, CO, USA
| | - Fernando Scaglia
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Texas Children's Hospital, USA; Joint BCM-CUHK Center of Medical Genetics, Prince of Wales Hospital, ShaTin, Hong Kong
| | - Gregory M Enns
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Austin A Larson
- Department of Pediatrics, Section of Genetics and Metabolism, University of Colorado School of Medicine, Aurora, CO, USA.
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12
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Kipper K, Hecht M, Antunes NJ, Fairbanks LD, Levene M, Kalkan Uçar S, Schaefer A, Blakely EL, Bax BE. Quantification of Plasma and Urine Thymidine and 2'-Deoxyuridine by LC-MS/MS for the Pharmacodynamic Evaluation of Erythrocyte Encapsulated Thymidine Phosphorylase in Patients with Mitochondrial Neurogastrointestinal Encephalomyopathy. J Clin Med 2020; 9:jcm9030788. [PMID: 32183169 PMCID: PMC7141342 DOI: 10.3390/jcm9030788] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/05/2020] [Accepted: 03/11/2020] [Indexed: 02/05/2023] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an ultra-rare disorder caused by mutations in TYMP, leading to a deficiency in thymidine phosphorylase and a subsequent systemic accumulation of thymidine and 2'-deoxyuridine. Erythrocyte-encapsulated thymidine phosphorylase (EE-TP) is under clinical development as an enzyme replacement therapy for MNGIE. Bioanalytical methods were developed according to regulatory guidelines for the quantification of thymidine and 2'-deoxyuridine in plasma and urine using liquid chromatography-tandem mass spectrometry (LC-MS/MS) for supporting the pharmacodynamic evaluation of EE-TP. Samples were deproteinized with 5% perchloric acid (v/v) and the supernatants analyzed using a Hypercarb column (30 × 2.1 mm, 3 µm), with mobile phases of 0.1% formic acid in methanol and 0.1% formic acid in deionized water. Detection was conducted using an ion-spray interface running in positive mode. Isotopically labelled thymidine and 2'-deoxyuridine were used as internal standards. Calibration curves for both metabolites showed linearity (r > 0.99) in the concentration ranges of 10-10,000 ng/mL for plasma, and 1-50 µg/mL for urine, with method analytical performances within the acceptable criteria for quality control samples. The plasma method was successfully applied to the diagnosis of two patients with MNGIE and the quantification of plasma metabolites in three patients treated with EE-TP.
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Affiliation(s)
- Karin Kipper
- Analytical Services International Ltd., St George’s University of London, Cranmer Terrace, London SW17 0RE, UK; (K.K.); (M.H.); (N.J.A.)
- University of Tartu, Institute of Chemistry, 14a Ravila Street, 50411 Tartu, Estonia
| | - Max Hecht
- Analytical Services International Ltd., St George’s University of London, Cranmer Terrace, London SW17 0RE, UK; (K.K.); (M.H.); (N.J.A.)
- University of Tartu, Institute of Chemistry, 14a Ravila Street, 50411 Tartu, Estonia
| | - Natalicia J. Antunes
- Analytical Services International Ltd., St George’s University of London, Cranmer Terrace, London SW17 0RE, UK; (K.K.); (M.H.); (N.J.A.)
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, SP 13083-881, Brazil
- Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | | | - Michelle Levene
- Molecular and Clinical Sciences, St George’s University of London, London SW17 0RE, UK;
| | - Sema Kalkan Uçar
- Division of Inborn Error of Metabolism, Ege University Medical Faculty, 35100 Izmir, Turkey;
| | - Andrew Schaefer
- The NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle upon Tyne NE2 4HH, UK; (A.S.); (E.L.B.)
| | - Emma L. Blakely
- The NHS Highly Specialised Service for Rare Mitochondrial Disorders, Newcastle upon Tyne NE2 4HH, UK; (A.S.); (E.L.B.)
| | - Bridget E. Bax
- Molecular and Clinical Sciences, St George’s University of London, London SW17 0RE, UK;
- Correspondence: ; Tel.: +0044(0)208-266-6836
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13
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Mitochondrial Neurogastrointestinal Encephalomyopathy: Novel Pathogenic Mutation in Thymidine Phosphorylase Gene in a Patient from Cape Verde Islands. Case Rep Neurol Med 2019; 2019:5976410. [PMID: 31885962 PMCID: PMC6927060 DOI: 10.1155/2019/5976410] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 08/24/2019] [Accepted: 09/27/2019] [Indexed: 11/17/2022] Open
Abstract
Mitochondrial Neurogastrointestinal Encephalomyopathy (MNGIE) is a rare autosomal recessive disorder caused by mutations in the gene encoding the Thymidine Phosphorylase (TP). It is clinically characterized by severe gastrointestinal dysmotility, cachexia, palpebral ptosis, ophthalmoparesis, sensorimotor polyneuropathy and leukoencephalopathy. The diagnosis is established by the presence of typical clinical and neuroimaging features, positive family history, and abnormal genetic test. A 19-year-old Cape Verdean patient with a history since childhood of recurrent episodes of nausea, vomiting, diarrhoea and painful abdominal distension associated with progressive motor disability with difficulty in climbing stairs and running and clumsiness with her hands. The diagnostic workup was suggestive of MNGIE. Genetic screening of the TYMP gene identified a novel mutation (c. 1283 G>A). Patients with MNGIE have significant comorbidity and mortality, and they are frequently misdiagnosed. A better acknowledgment of this disorder is essential to permit an earlier diagnosis and to improve disease management.
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14
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Orsucci D, Ienco EC, Siciliano G, Mancuso M. Mitochondrial disorders and drugs: what every physician should know. Drugs Context 2019; 8:212588. [PMID: 31391854 PMCID: PMC6668504 DOI: 10.7573/dic.212588] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 05/30/2019] [Accepted: 06/03/2019] [Indexed: 02/07/2023] Open
Abstract
Mitochondrial disorders are a group of metabolic conditions caused by impairment of the oxidative phosphorylation system. There is currently no clear evidence supporting any pharmacological interventions for most mitochondrial disorders, except for coenzyme Q10 deficiencies, Leber hereditary optic neuropathy, and mitochondrial neurogastrointestinal encephalomyopathy. Furthermore, some drugs may potentially have detrimental effects on mitochondrial dysfunction. Drugs known to be toxic for mitochondrial functions should be avoided whenever possible. Mitochondrial patients needing one of these treatments should be carefully monitored, clinically and by laboratory exams, including creatine kinase and lactate. In the era of molecular and ‘personalized’ medicine, many different physicians (not only neurologists) should be aware of the basic principles of mitochondrial medicine and its therapeutic implications. Multicenter collaboration is essential for the advancement of therapy for mitochondrial disorders. Whenever possible, randomized clinical trials are necessary to establish efficacy and safety of drugs. In this review we discuss in an accessible way the therapeutic approaches and perspectives in mitochondrial disorders. We will also provide an overview of the drugs that should be used with caution in these patients.
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15
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Madhok J, Leong J, Cohn J. Anesthetic Considerations for Liver Transplantation in a Patient with Mitochondrial Neurogastrointestinal Encephalopathy Syndrome. Cureus 2019; 11:e5038. [PMID: 31501730 PMCID: PMC6721878 DOI: 10.7759/cureus.5038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalopathy (MNGIE) is a rare, complex mitochondrial disorder with variable phenotypes caused by a defect in the TYMP gene that codes for the thymidine phosphorylase enzyme. Orthotopic liver transplantation (OLT) has been proposed as a curative option for patients by using the liver as a source to restore thymidine phosphorylase levels in the body. Anesthetic considerations for this syndrome have not been clearly outlined in the past. We describe the clinical presentation of a young woman with MNGIE, her perioperative assessment, and intraoperative management during liver transplantation.
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Affiliation(s)
- Jai Madhok
- Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, USA
| | - Jason Leong
- Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, USA
| | - Jed Cohn
- Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, USA
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16
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Cardiovascular Manifestations of Mitochondrial Disease. BIOLOGY 2019; 8:biology8020034. [PMID: 31083569 PMCID: PMC6628328 DOI: 10.3390/biology8020034] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/13/2019] [Accepted: 04/22/2019] [Indexed: 02/06/2023]
Abstract
Genetic mitochondrial cardiomyopathies are uncommon causes of heart failure that may not be seen by most physicians. However, the prevalence of mitochondrial DNA mutations and somatic mutations affecting mitochondrial function are more common than previously thought. In this review, the pathogenesis of genetic mitochondrial disorders causing cardiovascular disease is reviewed. Treatment options are presently limited to mostly symptomatic support, but preclinical research is starting to reveal novel approaches that may lead to better and more targeted therapies in the future. With better understanding and clinician education, we hope to improve clinician recognition and diagnosis of these rare disorders in order to improve ongoing care of patients with these diseases and advance research towards discovering new therapeutic strategies to help treat these diseases.
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17
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Cabrera-Pérez R, Vila-Julià F, Hirano M, Mingozzi F, Torres-Torronteras J, Martí R. Alpha-1-Antitrypsin Promoter Improves the Efficacy of an Adeno-Associated Virus Vector for the Treatment of Mitochondrial Neurogastrointestinal Encephalomyopathy. Hum Gene Ther 2019; 30:985-998. [PMID: 30900470 DOI: 10.1089/hum.2018.217] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a devastating disease caused by mutations in TYMP, which encodes thymidine phosphorylase (TP). In MNGIE patients, TP dysfunction results in systemic thymidine and deoxyuridine overload, which interferes with mitochondrial DNA replication. Preclinical studies have shown that gene therapy using a lentiviral vector targeted to hematopoietic stem cells or an adeno-associated virus (AAV) vector transcriptionally targeted to liver are feasible approaches to treat MNGIE. Here, we studied the effect of various promoters (thyroxine-binding globulin [TBG], phosphoglycerate kinase [PGK], hybrid liver-specific promoter [HLP], and alpha-1-antitrypsin [AAT]) and DNA configuration (single stranded or self complementary) on expression of the TYMP transgene in the AAV8 serotype in a murine model of MNGIE. All vectors restored liver TP activity and normalized nucleoside homeostasis in mice. However, the liver-specific promoters TBG, HLP, and AAT were more effective than the constitutive PGK promoter, and the self-complementary DNA configuration did not provide any therapeutic advantage over the single-stranded configuration. Among all constructs, only AAV-AAT was effective in all mice treated at the lowest dose (5 × 1010 vector genomes/kg). As use of the AAT promoter will likely minimize the dose needed to achieve clinical efficacy as compared to the other promoters tested, we propose using the AAT promoter in the vector eventually designed for clinical use.
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Affiliation(s)
- Raquel Cabrera-Pérez
- 1Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain; Paris, France.,2Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain; Paris, France
| | - Ferran Vila-Julià
- 1Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain; Paris, France.,2Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain; Paris, France
| | - Michio Hirano
- 3Department of Neurology, H. Houston Merritt Neuromuscular Research Center, Columbia University Medical Center, New York, New York; Paris, France
| | - Federico Mingozzi
- 4Genethon and INSERM U951, Evry, France; Paris, France.,5University Pierre and Marie Curie, Paris, France
| | - Javier Torres-Torronteras
- 1Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain; Paris, France.,2Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain; Paris, France
| | - Ramon Martí
- 1Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain; Paris, France.,2Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain; Paris, France
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18
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Levene M, Bain MD, Moran NF, Nirmalananthan N, Poulton J, Scarpelli M, Filosto M, Mandel H, MacKinnon AD, Fairbanks L, Pacitti D, Bax BE. Safety and Efficacy of Erythrocyte Encapsulated Thymidine Phosphorylase in Mitochondrial Neurogastrointestinal Encephalomyopathy. J Clin Med 2019; 8:jcm8040457. [PMID: 30959750 PMCID: PMC6517976 DOI: 10.3390/jcm8040457] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 03/20/2019] [Accepted: 04/03/2019] [Indexed: 02/05/2023] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an ultra-rare autosomal recessive disorder of nucleoside metabolism that is caused by mutations in the nuclear thymidine phosphorylase gene (TYMP) gene, encoding for the enzyme thymidine phosphorylase. There are currently no approved treatments for MNGIE. The aim of this study was to investigate the safety, tolerability, and efficacy of an enzyme replacement therapy for the treatment of MNGIE. In this single centre study, three adult patients with MNGIE received intravenous escalating doses of erythrocyte encapsulated thymidine phosphorylase (EE-TP; dose range: 4 to 108 U/kg/4 weeks). EE-TP was well tolerated and reductions in the disease-associated plasma metabolites, thymidine, and deoxyuridine were observed in all three patients. Clinical improvements, including weight gain and improved disease scores, were observed in two patients, suggesting that EE-TP is able to reverse some aspects of the disease pathology. Transient, non-serious adverse events were observed in two of the three patients; these did not lead to therapy discontinuation and they were managed with pre-medication prior to infusion of EE-TP. To conclude, enzyme replacement therapy with EE-TP demonstrated biochemical and clinical therapeutic efficacy with an acceptable clinical safety profile.
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Affiliation(s)
- Michelle Levene
- Molecular and Clinical Sciences, St. George's, University of London, London, SW17 ORE, UK.
| | - Murray D Bain
- Molecular and Clinical Sciences, St. George's, University of London, London, SW17 ORE, UK.
| | - Nicholas F Moran
- Department of Neuroscience, East Kent Hospitals Foundation Trust, Canterbury, CT1 3NG, UK.
| | - Niranjanan Nirmalananthan
- Departments of Neurology and Neuroradiology, Atkinson Morley Regional Neurosciences Centre, St George's Hospital, London, SW17 0QT, UK.
| | - Joanna Poulton
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford, OX3 9DU, UK.
| | - Mauro Scarpelli
- Neurology Unit, Azienda Ospedaliera Universitaria Integrata Verona, Piazzale Aristide Stefani, 1, 37126 Verona, Italy.
| | - Massimiliano Filosto
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | | | - Andrew D MacKinnon
- Departments of Neurology and Neuroradiology, Atkinson Morley Regional Neurosciences Centre, St George's Hospital, London, SW17 0QT, UK.
| | - Lynette Fairbanks
- The Purine Research Laboratory, St Thomas' Hospital, London SE1 7EH, UK.
| | - Dario Pacitti
- College of Medicine and Health, St Luke's Campus, University of Exeter, EX1 2LU, UK.
| | - Bridget E Bax
- Molecular and Clinical Sciences, St. George's, University of London, London, SW17 ORE, UK.
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Abstract
Mitochondrial diseases (MD) are caused by mutations in the mitochondrial DNA or nuclear DNA. The clinical manifestation is often most severe in tissues with high energy demands. The most common MDs are Leber's hereditary optic neuropathy (LHON), chronic progressive external ophthalmoplegia (CPEO) and mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes (MELAS). Therapeutic approaches for MD include bridging of respiratory chain defects, pharmacological stimulation of mitochondrial metabolism, supplementation of deficient factors and symptomatic treatment. Initial gene therapeutic approaches for causal treatment have already reached the clinical development stage. This article provides an introduction to MD, a summary of the most important syndromes and an overview over established and innovative therapeutic approaches.
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20
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Bax BE. Mitochondrial neurogastrointestinal encephalomyopathy: approaches to diagnosis and treatment. JOURNAL OF TRANSLATIONAL GENETICS AND GENOMICS 2019; 4:1-16. [PMID: 32914088 PMCID: PMC7116056 DOI: 10.20517/jtgg.2020.08] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an ultra-rare disease caused by mutations in TYMP, the gene encoding for the enzyme thymidine phosphorylase. The resulting enzyme deficiency leads to a systemic accumulation of thymidine and 2’-deoxyuridine and ultimately mitochondrial failure due to a progressive acquisition of secondary mitochondrial DNA (mtDNA) mutations and mtDNA depletion. MNGIE is characterised by gastrointestinal dysmotility, cachexia, peripheral neuropathy, ophthalmoplegia, ptosis and leukoencephalopathy. The disease is progressively degenerative and leads to death at an average age of 37.6 years. Patients invariably encounter misdiagnoses, diagnostic delays, and non-specific clinical management. Despite its rarity, MNGIE has invoked much interest in the development of therapeutic strategies, mainly because it is one of the few mitochondrial disorders where the molecular abnormality is metabolically and physically accessible to manipulation. This review provides a resume of the current diagnosis and treatment approaches and aims to increase the clinical awareness of MNGIE and thereby facilitate early diagnosis and timely access to treatments, before the development of untreatable and irreversible organ damage.
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Affiliation(s)
- Bridget E Bax
- Institute of Molecular and Clinical Sciences, St. George's University of London, London, SW17 ORE, UK
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21
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Pacitti D, Levene M, Garone C, Nirmalananthan N, Bax BE. Mitochondrial Neurogastrointestinal Encephalomyopathy: Into the Fourth Decade, What We Have Learned So Far. Front Genet 2018; 9:669. [PMID: 30627136 PMCID: PMC6309918 DOI: 10.3389/fgene.2018.00669] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 12/04/2018] [Indexed: 02/05/2023] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an ultra-rare metabolic autosomal recessive disease, caused by mutations in the nuclear gene TYMP which encodes the enzyme thymidine phosphorylase. The resulting enzyme deficiency leads to a systemic accumulation of the deoxyribonucleosides thymidine and deoxyuridine, and ultimately mitochondrial failure due to a progressive acquisition of secondary mitochondrial DNA (mtDNA) mutations and mtDNA depletion. Clinically, MNGIE is characterized by gastrointestinal and neurological manifestations, including cachexia, gastrointestinal dysmotility, peripheral neuropathy, leukoencephalopathy, ophthalmoplegia and ptosis. The disease is progressively degenerative and leads to death at an average age of 37.6 years. As with the vast majority of rare diseases, patients with MNGIE face a number of unmet needs related to diagnostic delays, a lack of approved therapies, and non-specific clinical management. We provide here a comprehensive collation of the available knowledge of MNGIE since the disease was first described 42 years ago. This review includes symptomatology, diagnostic procedures and hurdles, in vitro and in vivo disease models that have enhanced our understanding of the disease pathology, and finally experimental therapeutic approaches under development. The ultimate aim of this review is to increase clinical awareness of MNGIE, thereby reducing diagnostic delay and improving patient access to putative treatments under investigation.
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Affiliation(s)
- Dario Pacitti
- Molecular and Clinical Sciences Research Institute, St George's, University of London, London, United Kingdom
| | - Michelle Levene
- Molecular and Clinical Sciences Research Institute, St George's, University of London, London, United Kingdom
| | - Caterina Garone
- MRC Mitochondrial Biology Unit, Cambridge Biomedical, Cambridge, United Kingdom
| | | | - Bridget E. Bax
- Molecular and Clinical Sciences Research Institute, St George's, University of London, London, United Kingdom
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22
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Filosto M, Cotti Piccinelli S, Caria F, Gallo Cassarino S, Baldelli E, Galvagni A, Volonghi I, Scarpelli M, Padovani A. Mitochondrial Neurogastrointestinal Encephalomyopathy (MNGIE-MTDPS1). J Clin Med 2018; 7:jcm7110389. [PMID: 30373120 PMCID: PMC6262582 DOI: 10.3390/jcm7110389] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 10/14/2018] [Accepted: 10/24/2018] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE-MTDPS1) is a devastating autosomal recessive disorder due to mutations in TYMP, which cause a loss of function of thymidine phosphorylase (TP), nucleoside accumulation in plasma and tissues, and mitochondrial dysfunction. The clinical picture includes progressive gastrointestinal dysmotility, cachexia, ptosis and ophthalmoparesis, peripheral neuropathy, and diffuse leukoencephalopathy, which usually lead to death in early adulthood. Other two MNGIE-type phenotypes have been described so far, which are linked to mutations in POLG and RRM2B genes. Therapeutic options are currently available in clinical practice (allogeneic hematopoietic stem cell transplantation and carrier erythrocyte entrapped thymidine phosphorylase therapy) and newer, promising therapies are expected in the near future. Since successful treatment is strictly related to early diagnosis, it is essential that clinicians be warned about the clinical features and diagnostic procedures useful to suspect diagnosis of MNGIE-MTDPS1. The aim of this review is to promote the knowledge of the disease as well as the involved mechanisms and the diagnostic processes in order to reach an early diagnosis.
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Affiliation(s)
- Massimiliano Filosto
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Stefano Cotti Piccinelli
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Filomena Caria
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Serena Gallo Cassarino
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Enrico Baldelli
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Anna Galvagni
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Irene Volonghi
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
| | - Mauro Scarpelli
- Department of Neuroscience, Unit of Neurology, Azienda Ospedaliera Universitaria Integrata Verona, 37100 Verona, Italy.
| | - Alessandro Padovani
- Center for Neuromuscular Diseases, Unit of Neurology, ASST Spedali Civili and University of Brescia, 25100 Brescia, Italy.
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23
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Yadak R, Cabrera-Pérez R, Torres-Torronteras J, Bugiani M, Haeck JC, Huston MW, Bogaerts E, Goffart S, Jacobs EH, Stok M, Leonardelli L, Biasco L, Verdijk RM, Bernsen MR, Ruijter G, Martí R, Wagemaker G, van Til NP, de Coo IF. Preclinical Efficacy and Safety Evaluation of Hematopoietic Stem Cell Gene Therapy in a Mouse Model of MNGIE. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2018; 8:152-165. [PMID: 29687034 PMCID: PMC5908387 DOI: 10.1016/j.omtm.2018.01.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/02/2018] [Indexed: 12/15/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an autosomal recessive disorder caused by thymidine phosphorylase (TP) deficiency resulting in systemic accumulation of thymidine (d-Thd) and deoxyuridine (d-Urd) and characterized by early-onset neurological and gastrointestinal symptoms. Long-term effective and safe treatment is not available. Allogeneic bone marrow transplantation may improve clinical manifestations but carries disease and transplant-related risks. In this study, lentiviral vector-based hematopoietic stem cell gene therapy (HSCGT) was performed in Tymp−/−Upp1−/− mice with the human phosphoglycerate kinase (PGK) promoter driving TYMP. Supranormal blood TP activity reduced intestinal nucleoside levels significantly at low vector copy number (median, 1.3; range, 0.2–3.6). Furthermore, we covered two major issues not addressed before. First, we demonstrate aberrant morphology of brain astrocytes in areas of spongy degeneration, which was reversed by HSCGT. Second, long-term follow-up and vector integration site analysis were performed to assess safety of the therapeutic LV vectors in depth. This report confirms and supplements previous work on the efficacy of HSCGT in reducing the toxic metabolites in Tymp−/−Upp1−/− mice, using a clinically applicable gene transfer vector and a highly efficient gene transfer method, and importantly demonstrates phenotypic correction with a favorable risk profile, warranting further development toward clinical implementation.
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Affiliation(s)
- Rana Yadak
- Department of Neurology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Department of Hematology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Raquel Cabrera-Pérez
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Barcelona, Catalonia, Spain
| | - Javier Torres-Torronteras
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Barcelona, Catalonia, Spain
| | - Marianna Bugiani
- Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands
| | - Joost C. Haeck
- Department of Radiology & Nuclear Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Marshall W. Huston
- Department of Neurology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Elly Bogaerts
- Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Steffi Goffart
- Department of Biology, University of Eastern Finland, Joensuu, Finland
| | - Edwin H. Jacobs
- Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Merel Stok
- Department of Hematology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands
- Department of Pediatrics, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Lorena Leonardelli
- San Raffaele Telethon Institute for Gene Therapy (HSR-TIGET), Milan, Italy
| | - Luca Biasco
- San Raffaele Telethon Institute for Gene Therapy (HSR-TIGET), Milan, Italy
- Gene Therapy Program, Dana-Farber/Boston Children’s Cancer and Blood Disorders Center, Boston, MA, USA
- University College of London (UCL), Great Ormond Street Institute of Child Health (ICH), London, UK
| | - Robert M. Verdijk
- Department of Pathology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Monique R. Bernsen
- Department of Radiology & Nuclear Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - George Ruijter
- Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Ramon Martí
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Barcelona, Catalonia, Spain
| | - Gerard Wagemaker
- Department of Hematology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Hacettepe University, Stem Cell Research and Development Center, Ankara, Turkey
- Raisa Gorbacheva Memorial Research Institute for Pediatric Oncology and Hematology, Saint Petersburg, Russia
| | - Niek P. van Til
- Department of Hematology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Irenaeus F.M. de Coo
- Department of Neurology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Corresponding author: Irenaeus F.M. de Coo, Department of Neurology, Erasmus University Medical Center, PO Box 2060, 3000 CB Rotterdam, the Netherlands.
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24
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Baker MK, Schutte CM, Ranchhod N, Brittain D, van Rensburg JE. Transient clinical improvement of a mitochondrial neurogastrointestinal encephalomyopathy-like syndrome after allogeneic haematopoietic stem cell transplantation. BMJ Case Rep 2017; 2017:bcr-2016-218276. [PMID: 28765176 DOI: 10.1136/bcr-2016-218276] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalopathy (MNGIE), usually an autosomal-recessive inherited condition, causes gastrointestinal dysmotility, ophthalmoplegia, ptosis, leukoencephalopathy and neuropathy. The chromosome 22 disorder, due to mutations in the nuclear gene TYMP encoding thymidine phosphorylase (TP), leads to the accumulation of thymidine and deoxyuridine, with mitochondrial dysfunction.This report describes a patient with an MNGIE-like syndrome with a heterozygous TYMP mutation who showed marked, but transient improvement postallogeneic haematopoietic stem cell transplantation (HSCT).The patient, showing ptosis and ophthalmoplegia, was initially managed for myasthenia gravis. She developed gastrointestinal symptoms, dysarthria, dysphagia and weakness, and MNGIE was considered due to its low TP levels and improvement after platelet transfusions. She underwent HSCT, with dramatic improvement, but regressed 18 months later despite normal TP levels, platelet counts and full chimerism.MNGIE may encompass a spectrum of disorders. TP deficiency alone is unlikely to explain all clinical signs, and other factors, including the possible development of anti-TP antibodies, which may play a role in the pathophysiology.
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Affiliation(s)
- Malcolm Kevin Baker
- Department of Neurology, University of Pretoria, Pretoria, Gauteng, South Africa
| | - Clara Maria Schutte
- Department of Neurology, University of Pretoria, Pretoria, Gauteng, South Africa
| | - Neelay Ranchhod
- Department of Neurology, University of Pretoria, Pretoria, Gauteng, South Africa
| | | | - J E van Rensburg
- Department of Genetics, University of Pretoria, Pretoria, Gauteng, South Africa
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25
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Hanbali A, Rasheed W, Peedikayil MC, Boholega S, Alzahrani HA. Mitochondrial Neurogastrointestinal Encephalomyopathy Syndrome Treated with Stem Cell Transplant: A Case Series and Literature Review. EXP CLIN TRANSPLANT 2017; 16:773-778. [PMID: 28411356 DOI: 10.6002/ect.2016.0109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy syndrome is a rare autosomal recessive multisystem disorder caused by nuclear TYMP gene mutations, which leads to deficiency in thymidine phosphorylase enzyme. This deficiency then leads to mitochondrial dysfunction, which causes the features characteristic of this syndrome, including severe muscle wasting, gastrointestinal dysmotility, leukoencephalopathy, peripheral neuropathy, and ophthalmoplegia. Here, we present a case series of 3 patients with mitochondrial neurogastrointestinal encephalomyopathy from Saudi Arabia who underwent allogeneic stem cell transplant at King Faisal Specialist Hospital (Riyadh, Saudi Arabia). Two patients died within the first year of transplant, and the third is still alive but without improvement in clinical features. Allogeneic hematopoietic stem cell transplant-related mortality appears to be high; this may at least be partially related to established end-organ effects with decreased performance status. Although allogeneic hematopoietic stem cell transplant clearly affects correction of genetic and biochemical defects in mitochondrial neurogastrointestinal encephalomyopathy, its ability to reverse or improve established clinical manifestations has not been proven.
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Affiliation(s)
- Amr Hanbali
- King Faisal Specialist Hospital, Riyadh, Saudi Arabia
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26
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Di Meo I, Lamperti C, Tiranti V. Mitochondrial diseases caused by toxic compound accumulation: from etiopathology to therapeutic approaches. EMBO Mol Med 2016. [PMID: 26194912 PMCID: PMC4604682 DOI: 10.15252/emmm.201505040] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Mitochondrial disorders are a group of highly invalidating human conditions for which effective treatment is currently unavailable and characterized by faulty energy supply due to defective oxidative phosphorylation (OXPHOS). Given the complexity of mitochondrial genetics and biochemistry, mitochondrial inherited diseases may present with a vast range of symptoms, organ involvement, severity, age of onset, and outcome. Despite the wide spectrum of clinical signs and biochemical underpinnings of this group of dis-orders, some common traits can be identified, based on both pathogenic mechanisms and potential therapeutic approaches. Here, we will review two peculiar mitochondrial disorders, ethylmalonic encephalopathy (EE) and mitochondrial neurogastrointestinal encephalomyopathy (MNGIE), caused by mutations in the ETHE1 and TYMP nuclear genes, respectively. ETHE1 encodes for a mitochondrial enzyme involved in sulfide detoxification and TYMP for a cytosolic enzyme involved in the thymidine/deoxyuridine catabolic pathway. We will discuss these two clinical entities as a paradigm of mitochondrial diseases caused by the accumulation of compounds normally present in traces, which exerts a toxic and inhibitory effect on the OXPHOS system.
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Affiliation(s)
- Ivano Di Meo
- Unit of Molecular Neurogenetics, Foundation IRCCS Neurological Institute C. Besta, Milan, Italy
| | - Costanza Lamperti
- Unit of Molecular Neurogenetics, Foundation IRCCS Neurological Institute C. Besta, Milan, Italy
| | - Valeria Tiranti
- Unit of Molecular Neurogenetics, Foundation IRCCS Neurological Institute C. Besta, Milan, Italy
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27
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Leuzzi V, Rossi L, Gabucci C, Nardecchia F, Magnani M. Erythrocyte-mediated delivery of recombinant enzymes. J Inherit Metab Dis 2016; 39:519-30. [PMID: 27026098 DOI: 10.1007/s10545-016-9926-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 02/29/2016] [Accepted: 03/03/2016] [Indexed: 10/22/2022]
Abstract
The possibility to clone, express and purify recombinant enzymes have originated the opportunity to dispose of a virtually infinite array of proteins that could be used in the clinics to treat several inherited and acquired pathological conditions. However, the direct administration of these recombinant proteins faces some intrinsic difficulties, such as degradation by circulating proteases and/or inactivation by the patient immune system. The use of drug delivery systems may overcome these limitations. Concerning recombinant enzyme therapy, the present review will mainly focus on the exploitation of erythrocytes as a carrier system for enzymes removing potentially noxious metabolites from the circulation, either as limiting treatment strategy for auxotrophic tumours or as a detoxing approach for some intoxication type inherited metabolic disorders. Moreover, the possibility of using RBCs as a potential delivering system addressing the enzymes to the monocyte-macrophages of reticular endothelial system for the treatment of diseases associated with this cell lineage, e.g. lysosome storage diseases, will be briefly discussed.
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Affiliation(s)
- Vincenzo Leuzzi
- Department of Child and Adolescent Neuropsychiatry, SAPIENZA University of Rome, Via deiSabelli 108, 00185, Rome, Italy.
| | - Luigia Rossi
- Department of Biomolecular Science, University of Urbino, Via Saffi 2, 61029, Urbino, PU, Italy
| | - Claudia Gabucci
- Department of Biomolecular Science, University of Urbino, Via Saffi 2, 61029, Urbino, PU, Italy
| | - Francesca Nardecchia
- Department of Child and Adolescent Neuropsychiatry, SAPIENZA University of Rome, Via deiSabelli 108, 00185, Rome, Italy
- Department of Physiology and Pharmacology, SAPIENZA University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Mauro Magnani
- Department of Biomolecular Science, University of Urbino, Via Saffi 2, 61029, Urbino, PU, Italy
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28
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Novel sequence variations in the thymidine phosphorylase gene causing mitochondrial neurogastrointestinal encephalopathy. Clin Dysmorphol 2016; 25:156-62. [PMID: 27261974 DOI: 10.1097/mcd.0000000000000137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Torres-Torronteras J, Cabrera-Pérez R, Barba I, Costa C, de Luna N, Andreu AL, Barquinero J, Hirano M, Cámara Y, Martí R. Long-Term Restoration of Thymidine Phosphorylase Function and Nucleoside Homeostasis Using Hematopoietic Gene Therapy in a Murine Model of Mitochondrial Neurogastrointestinal Encephalomyopathy. Hum Gene Ther 2016; 27:656-67. [PMID: 27004974 DOI: 10.1089/hum.2015.160] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a metabolic disorder caused by mutations in TYMP, encoding thymidine phosphorylase (TP). In MNGIE patients, TP dysfunction produces systemic thymidine and deoxyuridine accumulation, which ultimately impairs mitochondrial DNA replication and results in mitochondrial dysfunction. To date, only allogeneic hematopoietic stem cell transplantation has demonstrated long-term clinical efficacy, but high morbidity and mortality associated with this procedure necessitate the search for safer alternatives. In a previous study, we demonstrated that hematopoietic stem cell gene therapy using a lentiviral vector containing the coding sequence of TYMP restored the biochemical homeostasis in an animal model of MNGIE. In the present follow-up study, we show that ectopic expression of TP in the hematopoietic system restores normal nucleoside levels in plasma, as well as in tissues affected in MNGIE such as small intestine, skeletal muscle, brain, and liver. Mitochondrial dNTP pool imbalances observed in liver of the animal model were also corrected by the treatment. The biochemical effects were maintained at least 20 months even with low levels of chimerism. No alterations in the blood cell counts or other toxic effects were observed in association with the lentiviral transduction or TP overexpression. These results further support the notion that gene therapy is a feasible treatment option for MNGIE.
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Affiliation(s)
- Javier Torres-Torronteras
- 1 Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
- 2 Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Raquel Cabrera-Pérez
- 1 Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
- 2 Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Ignasi Barba
- 3 Research Group on Cardiocirculatory Pathology, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
| | - Carme Costa
- 4 Servei de Neurologia-Neuroimmunologia, Centre d'Esclerosi Múltiple de Catalunya, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
| | - Noemí de Luna
- 1 Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
- 2 Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Antoni L Andreu
- 1 Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
- 2 Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Jordi Barquinero
- 5 Gene and Cell Therapy Laboratory, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
| | - Michio Hirano
- 6 Department of Neurology, H. Houston Merritt Center, Columbia University Medical Center , New York, New York
| | - Yolanda Cámara
- 1 Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
- 2 Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Ramon Martí
- 1 Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona , Barcelona, Spain
- 2 Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
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30
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Nightingale H, Pfeffer G, Bargiela D, Horvath R, Chinnery PF. Emerging therapies for mitochondrial disorders. Brain 2016; 139:1633-48. [PMID: 27190030 PMCID: PMC4892756 DOI: 10.1093/brain/aww081] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/26/2016] [Indexed: 12/18/2022] Open
Abstract
Mitochondrial disorders are a diverse group of debilitating conditions resulting from nuclear and mitochondrial DNA mutations that affect multiple organs, often including the central and peripheral nervous system. Despite major advances in our understanding of the molecular mechanisms, effective treatments have not been forthcoming. For over five decades patients have been treated with different vitamins, co-factors and nutritional supplements, but with no proven benefit. There is therefore a clear need for a new approach. Several new strategies have been proposed acting at the molecular or cellular level. Whilst many show promise in vitro, the clinical potential of some is questionable. Here we critically appraise the most promising preclinical developments, placing the greatest emphasis on diseases caused by mitochondrial DNA mutations. With new animal and cellular models, longitudinal deep phenotyping in large patient cohorts, and growing interest from the pharmaceutical industry, the field is poised to make a breakthrough.
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Affiliation(s)
- Helen Nightingale
- Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Gerald Pfeffer
- Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK Department of Clinical Neurosciences, University of Calgary, Calgary, Canada Hotchkiss Brain Institute, at the University of Calgary, Calgary, Canada
| | - David Bargiela
- Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Rita Horvath
- Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Patrick F Chinnery
- Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK MRC-Mitochondrial Biology Unit, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK Department of Clinical Neurosciences, Cambridge Biomedical Campus, University of Cambridge, Cambridge, CB2 0QQ, UK
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31
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Cabrera-Pérez R, Torres-Torronteras J, Vila-Julià F, Ortega FJ, Cámara Y, Barquinero J, Martí R. Prospective therapeutic approaches in mitochondrial neurogastrointestinal encephalomyopathy (MNGIE). Expert Opin Orphan Drugs 2015. [DOI: 10.1517/21678707.2015.1090307] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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32
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Halter JP, Michael W, Schüpbach M, Mandel H, Casali C, Orchard K, Collin M, Valcarcel D, Rovelli A, Filosto M, Dotti MT, Marotta G, Pintos G, Barba P, Accarino A, Ferra C, Illa I, Beguin Y, Bakker JA, Boelens JJ, de Coo IFM, Fay K, Sue CM, Nachbaur D, Zoller H, Sobreira C, Pinto Simoes B, Hammans SR, Savage D, Martí R, Chinnery PF, Elhasid R, Gratwohl A, Hirano M. Allogeneic haematopoietic stem cell transplantation for mitochondrial neurogastrointestinal encephalomyopathy. Brain 2015; 138:2847-58. [PMID: 26264513 DOI: 10.1093/brain/awv226] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Accepted: 06/19/2015] [Indexed: 12/18/2022] Open
Abstract
Haematopoietic stem cell transplantation has been proposed as treatment for mitochondrial neurogastrointestinal encephalomyopathy, a rare fatal autosomal recessive disease due to TYMP mutations that result in thymidine phosphorylase deficiency. We conducted a retrospective analysis of all known patients suffering from mitochondrial neurogastrointestinal encephalomyopathy who underwent allogeneic haematopoietic stem cell transplantation between 2005 and 2011. Twenty-four patients, 11 males and 13 females, median age 25 years (range 10-41 years) treated with haematopoietic stem cell transplantation from related (n = 9) or unrelated donors (n = 15) in 15 institutions worldwide were analysed for outcome and its associated factors. Overall, 9 of 24 patients (37.5%) were alive at last follow-up with a median follow-up of these surviving patients of 1430 days. Deaths were attributed to transplant in nine (including two after a second transplant due to graft failure), and to mitochondrial neurogastrointestinal encephalomyopathy in six patients. Thymidine phosphorylase activity rose from undetectable to normal levels (median 697 nmol/h/mg protein, range 262-1285) in all survivors. Seven patients (29%) who were engrafted and living more than 2 years after transplantation, showed improvement of body mass index, gastrointestinal manifestations, and peripheral neuropathy. Univariate statistical analysis demonstrated that survival was associated with two defined pre-transplant characteristics: human leukocyte antigen match (10/10 versus <10/10) and disease characteristics (liver disease, history of gastrointestinal pseudo-obstruction or both). Allogeneic haematopoietic stem cell transplantation can restore thymidine phosphorylase enzyme function in patients with mitochondrial neurogastrointestinal encephalomyopathy and improve clinical manifestations of mitochondrial neurogastrointestinal encephalomyopathy in the long term. Allogeneic haematopoietic stem cell transplantation should be considered for selected patients with an optimal donor.
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Affiliation(s)
- Joerg P Halter
- 1 Haematology, University Hospital Basel, Basel, Switzerland
| | - W Michael
- 1 Haematology, University Hospital Basel, Basel, Switzerland2 Department of Neurology, Inselspital, Berne University Hospital, and University of Bern, Switzerland3 Centre d'Investigation Clinique 9503, Institut du Cerveau et de la Moelle Épinière, Département de Neurologie, Université Pierre et Marie Curie-Paris 6 and INSERM, Centre Hospitalier Universitaire Pitié-Salpêtrière, Paris, France4 Rambam Medical Centre Haifa, Israel5 Dep. SBMC - Sapienza University Roma, Italy6 University Hospital Southampton, UK7 Newcastle University, Newcastle upon Tyne, UK8 University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain9 BMT Unit, MBBM Foundation, Paediatric Dept., University of Milano-Bicocca, San Gerardo Hospital, Monza, Italy10 Clinical Neurology, Section for Neuromuscular Diseases and Neuropathies, University Hospital "Spedali Civili", Brescia, Italy11 Department of Neurological, Neurosurgical and Behavioural Sciences, University of Siena, Italy12 Stem Cell Transplant and Cellular Therapy Unit, University Hospital, Siena, Italy13 Department of Paediatrics, University Hospital Germans Trias i Pujol, Badalona, Barcelona, Spain14 Department of Haematology - Catalan Institute of Oncology, University Hospital Germans Trias i Pujol, Badalona, Barcelona, Spain15 Hospital de la Santa Creu i Sant Pau Universitat Autònoma Barcelona, Spain16 CHU Sart-Tilman Liege, Belgium17 Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Centre, Leiden, The Netherlands18 University Medical Centre Utrecht; Paediatric Blood and Marrow Transplantation Program, Utrecht, The Netherlands19 Department of Neurology and Child Neurology SKZ, Erasmus MC - University Medical Centre Rotterdam, The Netherlands20 Department of Haematology, Royal North Shore and St. Vincent Hospitals Sydney, Australia21 Department of Neurology, Royal North Shore Hospital, University of Sydney, Australia22 Medical University of Innsbruck, Departments of Medic
| | - M Schüpbach
- 2 Department of Neurology, Inselspital, Berne University Hospital, and University of Bern, Switzerland 3 Centre d'Investigation Clinique 9503, Institut du Cerveau et de la Moelle Épinière, Département de Neurologie, Université Pierre et Marie Curie-Paris 6 and INSERM, Centre Hospitalier Universitaire Pitié-Salpêtrière, Paris, France
| | | | | | | | | | - David Valcarcel
- 8 University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Attilio Rovelli
- 9 BMT Unit, MBBM Foundation, Paediatric Dept., University of Milano-Bicocca, San Gerardo Hospital, Monza, Italy
| | - Massimiliano Filosto
- 10 Clinical Neurology, Section for Neuromuscular Diseases and Neuropathies, University Hospital "Spedali Civili", Brescia, Italy
| | - Maria T Dotti
- 11 Department of Neurological, Neurosurgical and Behavioural Sciences, University of Siena, Italy
| | - Giuseppe Marotta
- 12 Stem Cell Transplant and Cellular Therapy Unit, University Hospital, Siena, Italy
| | - Guillem Pintos
- 13 Department of Paediatrics, University Hospital Germans Trias i Pujol, Badalona, Barcelona, Spain
| | - Pere Barba
- 8 University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Anna Accarino
- 8 University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Christelle Ferra
- 14 Department of Haematology - Catalan Institute of Oncology, University Hospital Germans Trias i Pujol, Badalona, Barcelona, Spain
| | - Isabel Illa
- 15 Hospital de la Santa Creu i Sant Pau Universitat Autònoma Barcelona, Spain
| | | | - Jaap A Bakker
- 17 Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Centre, Leiden, The Netherlands
| | - Jaap J Boelens
- 18 University Medical Centre Utrecht; Paediatric Blood and Marrow Transplantation Program, Utrecht, The Netherlands
| | - Irenaeus F M de Coo
- 19 Department of Neurology and Child Neurology SKZ, Erasmus MC - University Medical Centre Rotterdam, The Netherlands
| | - Keith Fay
- 20 Department of Haematology, Royal North Shore and St. Vincent Hospitals Sydney, Australia
| | - Carolyn M Sue
- 21 Department of Neurology, Royal North Shore Hospital, University of Sydney, Australia
| | - David Nachbaur
- 22 Medical University of Innsbruck, Departments of Medicine II and V, Austria
| | - Heinz Zoller
- 22 Medical University of Innsbruck, Departments of Medicine II and V, Austria
| | - Claudia Sobreira
- 23 Department of Neuroscience, Division of Neurology, Ribeirao Preto School of Medicine, Sao Paulo University, Brazil
| | - Belinda Pinto Simoes
- 24 Stem Cell Transplantation Unit, Internal Medicine Department, Ribeirao Preto School of Medicine, Sao Paulo University, Brazil
| | | | | | - Ramon Martí
- 8 University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain 27 Biomedical Network Research Centre on Rare Diseases (CIBERER) ISCIII, Barcelona, Spain
| | | | - Ronit Elhasid
- 28 Dana Children's Hospital, Sourasky Medical Centre, Tel Aviv, Israel
| | - Alois Gratwohl
- 1 Haematology, University Hospital Basel, Basel, Switzerland
| | - Michio Hirano
- 29 Department of Neurology, Columbia University Medical Centre, New York, NY, USA
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Peedikayil MC, Kagevi EI, Abufarhaneh E, Alsayed MD, Alzahrani HA. Mitochondrial Neurogastrointestinal Encephalomyopathy Treated with Stem Cell Transplantation: A Case Report and Review of Literature. Hematol Oncol Stem Cell Ther 2015; 8:85-90. [PMID: 25585305 DOI: 10.1016/j.hemonc.2014.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 12/09/2014] [Accepted: 12/09/2014] [Indexed: 10/24/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a rare autosomal recessive disorder. The mutation in the ECGF1 gene causes severe deficiency of thymidine phosphorylase (TP), which in turn increases thymidine and deoxyuridine in the blood, serum, and tissue. The toxic levels of these products cause malfunction of the mitochondrial respiratory chain and mitochondrial DNA. Commonly, patients become symptomatic between 15 and 20 years of age (range 5 months to 35 years). The most commonly affected systems are gastrointestinal, followed by ocular, and nervous system. The disease is often fatal; high mortality rate is reported between 20 and 40 years of age. Treatment modalities that can increase thymidine phosphorylase activity and decrease thymidine and deoxy-uridine have shown symptomatic improvements in patients with MNGIE. Platelet transfusion, hemodialysis, peritoneal dialysis or allogeneic hematopoietic stem cell transplantation (HSCT) have been tried. The survival and long-term benefits of these measures are still not clear. Engrafted patients after stem cell transplantation have showed improvements in serum thymidine and deoxyuridine. We are reporting a case of MNGIE from Saudi Arabia, who underwent allogeneic hematopoietic stem cell transplantation. No MNGIE case has been previously reported from Saudi Arabia or the Gulf Arab countries. From the available literature, so far only 11 patients with MNGIE have undergone stem cell transplantation.
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Affiliation(s)
| | - Eje Ingvar Kagevi
- King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia.
| | - Ehab Abufarhaneh
- King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia.
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Dreznik Y, Gutman M, Weiss B, Nevler A. Mitochondrial neuro-gastrointestinal encephalomyopathy presenting with recurrent bowel perforations and intra-abdominal abscesses. J Gastrointest Surg 2014; 18:2054-6. [PMID: 25022257 DOI: 10.1007/s11605-014-2589-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 07/01/2014] [Indexed: 01/31/2023]
Abstract
INTRODUCTION Mitochondrial neuro-gastrointestinal encephalomyopathy syndrome (MNGIE syndrome) is a rare genetic disorder that is defined clinically by severe gastrointestinal dysmotility, cachexia, peripheral neuropathy, ptosis and/or ophthalmoparesis, and leukoencephalopathy. CASE REPORT We report a case of a 26-year-old man with MNGIE syndrome with a unique clinical picture consisting of recurrent episodes of spontaneous bowel perforation and multiple intra-abdominal abscesses. The patient was admitted to our hospital several times in the past few years and underwent urgent laparotomies due to perforations in the small bowel. CONCLUSION Case reports regarding bowel perforations in MNGIE syndrome are scarce and mostly relate to a single perforation and attributed to chronic pseudo-obstruction of the small bowel. To the best of our knowledge, there are no case reports regarding recurrent perforations and abscesses. Surgical management of these cases is challenging as there is no curative option for this genetic disorder. Primary care physicians and treating gastroenterologists should be aware of the potential surgical emergencies associated with this disorder.
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Affiliation(s)
- Yael Dreznik
- Department of Surgery and Transplantation, Chaim Sheba Medical Center, Tel-Hashomer, Israel,
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Balasubramaniam S, Duley JA, Christodoulou J. Inborn errors of pyrimidine metabolism: clinical update and therapy. J Inherit Metab Dis 2014; 37:687-98. [PMID: 25030255 DOI: 10.1007/s10545-014-9742-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 06/05/2014] [Accepted: 06/24/2014] [Indexed: 10/25/2022]
Abstract
Inborn errors involving enzymes essential for pyrimidine nucleotide metabolism have provided new insights into their fundamental physiological roles as vital constituents of nucleic acids as well as substrates of lipid and carbohydrate metabolism and in oxidative phosphorylation. Genetic aberrations of pyrimidine pathways lead to diverse clinical manifestations including neurological, immunological, haematological, renal impairments, adverse reactions to analogue therapy and association with malignancies. Maintenance of cellular nucleotides depends on the three aspects of metabolism of pyrimidines: de novo synthesis, catabolism and recycling of these metabolites. Of the ten recognised disorders of pyrimidine metabolism treatment is currently restricted to only two disorders: hereditary orotic aciduria (oral uridine therapy) and mitochondrial neurogastrointestinal encephalomyopathy (MNGIE; allogeneic hematopoetic stem cell transplant and enzyme replacement). The ubiquitous role that pyrimidine metabolism plays in human life highlights the importance of improving diagnostic evaluation in suggestive clinical settings, which will contribute to the elucidation of new defects, future development of novel drugs and therapeutic strategies. Limited awareness of the expanding phenotypic spectrum, with relatively recent descriptions of newer disorders, compounded by considerable genetic heterogeneity has often contributed to the delays in the diagnosis of this group of disorders. The lack of an easily recognisable, easily measurable end product, akin to uric acid in purine metabolism, has contributed to the under-recognition of these disorders.This review describes the currently known inborn errors of pyrimidine metabolism, their variable phenotypic presentations, established diagnostic methodology and recognised treatment options.
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Affiliation(s)
- Shanti Balasubramaniam
- Metabolic Unit, Princess Margaret Hospital, Roberts Road, Subiaco, Perth, WA, 6008, Australia
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Boschetti E, D’Alessandro R, Bianco F, Carelli V, Cenacchi G, Pinna AD, Gaudio MD, Rinaldi R, Stanghellini V, Pironi L, Rhoden K, Tugnoli V, Casali C, De Giorgio R. Liver as a source for thymidine phosphorylase replacement in mitochondrial neurogastrointestinal encephalomyopathy. PLoS One 2014; 9:e96692. [PMID: 24802030 PMCID: PMC4011889 DOI: 10.1371/journal.pone.0096692] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 04/10/2014] [Indexed: 01/22/2023] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a rare autosomal recessive mitochondrial disease associated with mutations in the nuclear TYMP gene. As a result, the thymidine phosphorylase (TP) enzyme activity is markedly reduced leading to toxic accumulation of thymidine and therefore altered mitochondrial DNA. MNGIE is characterized by severe gastrointestinal dysmotility, neurological impairment, reduced life expectancy and poor quality of life. There are limited therapeutic options for MNGIE. In the attempt to restore TP activity, allogenic hematopoietic stem cell transplantation has been used as cellular source of TP. The results of this approach on ∼20 MNGIE patients showed gastrointestinal and neurological improvement, although the 5-year mortality rate is about 70%. In this study we tested whether the liver may serve as an alternative source of TP. We investigated 11 patients (7M; 35–55 years) who underwent hepatic resection for focal disorders. Margins of normal liver tissue were processed to identify, quantify and localize the TP protein by Western Blot, ELISA, and immunohistochemistry, and to evaluate TYMP mRNA expression by qPCR. Western Blot identified TP in liver with a TP/GAPDH ratio of 0.9±0.5. ELISA estimated TP content as 0.5±0.07 ng/μg of total protein. TP was identified in both nuclei and cytoplasm of hepatocytes and sinusoidal lining cells. Finally, TYMP mRNA was expressed in the liver. Overall, our study demonstrates that the liver is an important source of TP. Orthotopic liver transplantation may be considered as a therapeutic alternative for MNGIE patients.
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Affiliation(s)
- Elisa Boschetti
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | | | - Francesca Bianco
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
| | - Valerio Carelli
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Giovanna Cenacchi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Antonio D. Pinna
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
| | - Massimo Del Gaudio
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
| | - Rita Rinaldi
- Neurology Unit, St. Orsola-Malpighi Hospital, Bologna, Italy
| | | | - Loris Pironi
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
| | - Kerry Rhoden
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
| | - Vitaliano Tugnoli
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Carlo Casali
- Department of Medico-Surgical Sciences and Biotechnologies, University ‘La Sapienza’, Rome, Italy
| | - Roberto De Giorgio
- Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italy
- * E-mail:
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Torres-Torronteras J, Viscomi C, Cabrera-Pérez R, Cámara Y, Di Meo I, Barquinero J, Auricchio A, Pizzorno G, Hirano M, Zeviani M, Martí R. Gene therapy using a liver-targeted AAV vector restores nucleoside and nucleotide homeostasis in a murine model of MNGIE. Mol Ther 2014; 22:901-7. [PMID: 24448160 PMCID: PMC4015233 DOI: 10.1038/mt.2014.6] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 01/14/2014] [Indexed: 11/09/2022] Open
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an autosomal recessive disorder caused by mutations in TYMP, enconding thymidine phosphorylase (TP). TP deficiency results in systemic accumulation of thymidine and deoxyuridine, which interferes with mitochondrial DNA (mtDNA) replication and leads to mitochondrial dysfunction. To date, the only treatment available for MNGIE patients is allogeneic hematopoietic stem cell transplantation, which is associated with high morbidity and mortality. Here, we report that AAV2/8-mediated transfer of the human TYMP coding sequence (hcTYMP) under the control of a liver-specific promoter prevents the biochemical imbalances in a murine model of MNGIE. hcTYMP expression was restricted to liver, and a dose as low as 2 × 10(11) genome copies/kg led to a permanent reduction in systemic nucleoside levels to normal values in about 50% of treated mice. Higher doses resulted in reductions to normal or slightly below normal levels in virtually all mice treated. The nucleoside reduction achieved by this treatment prevented deoxycytidine triphosphate (dCTP) depletion, which is the limiting factor affecting mtDNA replication in this disease. These results demonstrate that the use of AAV to direct TYMP expression in liver is feasible as a potentially safe gene therapy strategy for MNGIE.
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Affiliation(s)
- Javier Torres-Torronteras
- Mitochondrial Disorders Unit, Vall d'Hebron Institut de Recerca, Universitat Autònoma de Barcelona, Barcelona, Spain
- Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain
| | - Carlo Viscomi
- Molecular Neurogenetics Unit, IRCCS Foundation Neurological Institute “C, Besta”, Milan, Italy
- MRC-Mitochondrial Biology Unit, Cambridge, UK
| | - Raquel Cabrera-Pérez
- Mitochondrial Disorders Unit, Vall d'Hebron Institut de Recerca, Universitat Autònoma de Barcelona, Barcelona, Spain
- Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain
| | - Yolanda Cámara
- Mitochondrial Disorders Unit, Vall d'Hebron Institut de Recerca, Universitat Autònoma de Barcelona, Barcelona, Spain
- Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain
| | - Ivano Di Meo
- Molecular Neurogenetics Unit, IRCCS Foundation Neurological Institute “C, Besta”, Milan, Italy
| | - Jordi Barquinero
- Gene and Cell Therapy Unit, Vall d'Hebron Institut de Recerca, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Alberto Auricchio
- Telethon Institute of Genetics and Medicine and Division of Medical Genetics, Department of Pediatrics, ‘‘Federico II'' University, Naples, Italy
| | - Giuseppe Pizzorno
- Human Health and Environment Program, Desert Research Institute, Las Vegas, Nevada, USA
| | - Michio Hirano
- Department of Neurology, Columbia University Medical Center, New York, USA
| | - Massimo Zeviani
- Molecular Neurogenetics Unit, IRCCS Foundation Neurological Institute “C, Besta”, Milan, Italy
- MRC-Mitochondrial Biology Unit, Cambridge, UK
| | - Ramon Martí
- Mitochondrial Disorders Unit, Vall d'Hebron Institut de Recerca, Universitat Autònoma de Barcelona, Barcelona, Spain
- Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain
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Nogueira C, Almeida LS, Nesti C, Pezzini I, Videira A, Vilarinho L, Santorelli FM. Syndromes associated with mitochondrial DNA depletion. Ital J Pediatr 2014; 40:34. [PMID: 24708634 PMCID: PMC3985578 DOI: 10.1186/1824-7288-40-34] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 03/28/2014] [Indexed: 01/21/2023] Open
Abstract
Mitochondrial dysfunction accounts for a large group of inherited metabolic disorders most of which are due to a dysfunctional mitochondrial respiratory chain (MRC) and, consequently, deficient energy production. MRC function depends on the coordinated expression of both nuclear (nDNA) and mitochondrial (mtDNA) genomes. Thus, mitochondrial diseases can be caused by genetic defects in either the mitochondrial or the nuclear genome, or in the cross-talk between the two. This impaired cross-talk gives rise to so-called nuclear-mitochondrial intergenomic communication disorders, which result in loss or instability of the mitochondrial genome and, in turn, impaired maintenance of qualitative and quantitative mtDNA integrity. In children, most MRC disorders are associated with nuclear gene defects rather than alterations in the mtDNA itself. The mitochondrial DNA depletion syndromes (MDSs) are a clinically heterogeneous group of disorders with an autosomal recessive pattern of transmission that have onset in infancy or early childhood and are characterized by a reduced number of copies of mtDNA in affected tissues and organs. The MDSs can be divided into least four clinical presentations: hepatocerebral, myopathic, encephalomyopathic and neurogastrointestinal. The focus of this review is to offer an overview of these syndromes, listing the clinical phenotypes, together with their relative frequency, mutational spectrum, and possible insights for improving diagnostic strategies.
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Affiliation(s)
| | | | | | | | | | - Laura Vilarinho
- National Institute of Health, Genetics Department, Research and Development Unit, Porto, Portugal.
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Ariaudo C, Daidola G, Ferrero B, Guarena C, Burdese M, Segoloni GP, Biancone L. Mitochondrial neurogastrointestinal encephalomyopathy treated with peritoneal dialysis and bone marrow transplantation. J Nephrol 2014; 28:125-7. [PMID: 24599829 DOI: 10.1007/s40620-014-0069-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 12/30/2013] [Indexed: 11/25/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a rare disease caused by thymidine phosphorylase deficiency which leads to toxic accumulations of thymidine (dThd) and deoxyuridine (dUrd). It lacks an established treatment and the prognosis is traditionally poor. We report a case of a young female patient with normal renal function and MNGIE treated by peritoneal dialysis (PD) and allogeneic bone marrow transplantation (BMT). PD was effective in reducing dThd and dUrd plasma levels and in improving clinical symptoms. To our knowledge, this is the first report on the beneficial effects of PD regarding MNGIE neurological symptoms. PD, therefore, should be considered especially in medically compromised patients as a supportive treatment to improve clinical conditions before BMT.
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Affiliation(s)
- Claudia Ariaudo
- SCU Nephrology, Dialysis and Transplantation, Department of Internal Medicine, Molinette Hospital, Turin, Italy
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40
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McInnes J. Mitochondrial-associated metabolic disorders: foundations, pathologies and recent progress. Nutr Metab (Lond) 2013; 10:63. [PMID: 24499129 PMCID: PMC3853754 DOI: 10.1186/1743-7075-10-63] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Accepted: 10/08/2013] [Indexed: 01/06/2023] Open
Abstract
Research in the last decade has revolutionized the way in which we view mitochondria. Mitochondria are no longer viewed solely as cellular powerhouses; rather, mitochondria are now understood to be vibrant, mobile structures, constantly undergoing fusion and fission, and engaging in intimate interactions with other cellular compartments and structures. Findings have implicated mitochondria in a wide variety of cellular processes and molecular interactions, such as calcium buffering, lipid flux, and intracellular signaling. As such, it does not come as a surprise that an increasing number of human pathologies have been associated with functional defects in mitochondria. The difficulty in understanding and treating human pathologies caused by mitochondrial dysfunction arises from the complex relationships between mitochondria and other cellular processes, as well as the genetic background of such diseases. This review attempts to provide a summary of the background knowledge and recent developments in mitochondrial processes relating to mitochondrial-associated metabolic diseases arising from defects or deficiencies in mitochondrial function, as well as insights into current and future avenues for investigation.
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Affiliation(s)
- Joseph McInnes
- School of Engineering and Science, Research Center MOLIFE - Molecular Life Science, Jacobs University Bremen, Campus Ring 1, Research II, Room 120, Bremen D-28759, Germany.
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41
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El-Hattab AW, Scaglia F. Mitochondrial DNA depletion syndromes: review and updates of genetic basis, manifestations, and therapeutic options. Neurotherapeutics 2013; 10:186-98. [PMID: 23385875 PMCID: PMC3625391 DOI: 10.1007/s13311-013-0177-6] [Citation(s) in RCA: 157] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Mitochondrial DNA (mtDNA) depletion syndromes (MDS) are a genetically and clinically heterogeneous group of autosomal recessive disorders that are characterized by a severe reduction in mtDNA content leading to impaired energy production in affected tissues and organs. MDS are due to defects in mtDNA maintenance caused by mutations in nuclear genes that function in either mitochondrial nucleotide synthesis (TK2, SUCLA2, SUCLG1, RRM2B, DGUOK, and TYMP) or mtDNA replication (POLG and C10orf2). MDS are phenotypically heterogeneous and usually classified as myopathic, encephalomyopathic, hepatocerebral or neurogastrointestinal. Myopathic MDS, caused by mutations in TK2, usually present before the age of 2 years with hypotonia and muscle weakness. Encephalomyopathic MDS, caused by mutations in SUCLA2, SUCLG1, or RRM2B, typically present during infancy with hypotonia and pronounced neurological features. Hepatocerebral MDS, caused by mutations in DGUOK, MPV17, POLG, or C10orf2, commonly have an early-onset liver dysfunction and neurological involvement. Finally, TYMP mutations have been associated with mitochondrial neurogastrointestinal encephalopathy (MNGIE) disease that typically presents before the age of 20 years with progressive gastrointestinal dysmotility and peripheral neuropathy. Overall, MDS are severe disorders with poor prognosis in the majority of affected individuals. No efficacious therapy is available for any of these disorders. Affected individuals should have a comprehensive evaluation to assess the degree of involvement of different systems. Treatment is directed mainly toward providing symptomatic management. Nutritional modulation and cofactor supplementation may be beneficial. Liver transplantation remains controversial. Finally, stem cell transplantation in MNGIE disease shows promising results.
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Affiliation(s)
- Ayman W. El-Hattab
- />Division of Medical Genetics, Department of Pediatrics, The Children’s Hospital, King Fahad Medical City and Faculty of Medicine, King Saud bin Abdulaziz University for Health Science, Riyadh, Kingdom of Saudi Arabia
| | - Fernando Scaglia
- />Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX 77030 USA
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Hussein E. Non-myeloablative bone marrow transplant and platelet infusion can transiently improve the clinical outcome of mitochondrial neurogastrointestinal encephalopathy: a case report. Transfus Apher Sci 2013; 49:208-11. [PMID: 23410918 DOI: 10.1016/j.transci.2013.01.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 08/29/2012] [Accepted: 01/10/2013] [Indexed: 11/27/2022]
Abstract
Mitochondrial neurogastrointestinal encephalopathy (MNGIE) is caused by deficiency in thymidine phosphorylase (TP), that regulates thymidine (dThd) and deoxyuridine (dUrd). Toxic levels of dThd and dUrd can lead to mitochondrial dysfunction by impairing mitochondrial DNA replication, causing GI and neurologic deterioration. We studied the impact of bone marrow transplant (BMT) and platelets, as a source of TP on the clinical outcome of MNGIE. We report a case of MNGIE, who presented with severe vomiting. Over time, he was non-ambulatory and his GI symptoms got progressively worse with severe dysphagia, abdominal pain episodes, persistent vomiting and diarrhea. Being unfit for intense conditioning regimen, he received a mini BMT, with mild conditioning regimen. Bone marrow was obtained from his HLA fully matched brother. One month after transplantation, donor chimerism in peripheral blood was 33%. Excellent clinical responses were achieved 3 months after transplantation and circulating donor cell chimerism decreased to 24% with a significant increase in platelet TP activity. Ten months post transplant the patient's symptoms recurred and fresh single donor platelets were infused, with a significant increase in platelet TP activity. Mini BMT and platelet transfusion can transiently increase circulating TP activity and might prevent progress of this fatal disease.
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Affiliation(s)
- Eiman Hussein
- Cairo University Blood Bank, Clinical Pathology Department, Cairo University, Egypt.
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43
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Schiff M, Bénit P, Jacobs HT, Vockley J, Rustin P. Therapies in inborn errors of oxidative metabolism. Trends Endocrinol Metab 2012; 23:488-95. [PMID: 22633959 PMCID: PMC4135311 DOI: 10.1016/j.tem.2012.04.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 04/19/2012] [Accepted: 04/21/2012] [Indexed: 11/21/2022]
Abstract
Mitochondrial diseases encompass a wide range of presentations and mechanisms, dictating a need to consider both broad-based and disease-specific therapies. The manifestations of mitochondrial dysfunction and the response to therapy vary between individuals. This probably reflects the genetic complexity of mitochondrial biology, which requires an excess of 2000 genes for proper function, with numerous interfering epigenetic and environmental factors. Accordingly, we are increasingly aware of the complexity of these diseases which involve far more than merely decreased ATP supply. Indeed, recent therapeutic progress has addressed only specific disease entities. In this review present and prospective therapeutic approaches will be discussed on the basis of targets and mechanism of action, but with a broad outlook on their potential applications.
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Affiliation(s)
- Manuel Schiff
- Institut National de la Santé et de la Recherche Médicale Unité 676, Hôpital Robert Debré, F-75019 Paris, France
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Filosto M, Scarpelli M, Tonin P, Lucchini G, Pavan F, Santus F, Parini R, Donati MA, Cotelli MS, Vielmi V, Todeschini A, Canonico F, Tomelleri G, Padovani A, Rovelli A. Course and management of allogeneic stem cell transplantation in patients with mitochondrial neurogastrointestinal encephalomyopathy. J Neurol 2012; 259:2699-706. [PMID: 22711161 DOI: 10.1007/s00415-012-6572-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 05/25/2012] [Accepted: 05/28/2012] [Indexed: 11/27/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is an autosomal recessive disorder caused by mutations in the gene encoding thymidine phosphorylase (TP). Allogeneic hematopoietic stem cell transplantation (HSCT) has been proposed as a treatment for patients with MNGIE and a standardized approach to HSCT in this condition has recently been developed. We report on the transplant course, management and short-term follow-up in two MNGIE patients who underwent HSCT. The source of stem cells was bone marrow taken from an HLA 9/10 allele-matched unrelated donor in the first patient and from an HLA 10/10 allele-matched sibling donor in the second. Both patients achieved full donor chimerism, and we observed restoration of buffy coat TP activity and lowered urine nucleoside concentrations in both of them. The post-transplant clinical follow-up showed improvement in gastrointestinal dysmotility, abdominal cramps and diarrhea. Neurological assessment remained unchanged. However, the first patient died 15 months after HSCT due to gastrointestinal obstruction and shock; the second patient died 8 months after the procedure due to respiratory distress following septic shock. Although HSCT corrects biochemical abnormalities and improves gastrointestinal symptoms, the procedure can be risky in subjects already in poor medical condition as are many MNGIE patients. Since transplant-related morbidity and mortality increases with progression of the disease and number of comorbidities, MNGIE patients should be submitted to HSCT when they are still relatively healthy, in order to minimize the complications of the procedure. Anyway, there is still incomplete knowledge on the natural history of the disease in many affected patients and it is not yet clear when the best time to do a transplant is. Further clues to the therapeutic potential of HSCT could result from a prolonged observation in a greater number of non-transplanted and transplanted patients, which would allow us to answer the questions of if, how and when MNGIE patients require HSCT treatment.
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Affiliation(s)
- Massimiliano Filosto
- Clinical Neurology, Section for Neuromuscular Diseases and Neuropathies, University Hospital "Spedali Civili", Pz.le Spedali Civili 1, 25100 Brescia, Italy.
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Abstract
Mitochondrial DNA (mtDNA) is replicated by the DNA polymerase g in concert with accessory proteins such as the mtDNA helicase, single stranded DNA binding protein, topoisomerase, and initiating factors. Nucleotide precursors for mtDNA replication arise from the mitochondrial salvage pathway originating from transport of nucleosides, or alternatively from cytoplasmic reduction of ribonucleotides. Defects in mtDNA replication or nucleotide metabolism can cause mitochondrial genetic diseases due to mtDNA deletions, point mutations, or depletion which ultimately cause loss of oxidative phosphorylation. These genetic diseases include mtDNA depletion syndromes such as Alpers or early infantile hepatocerebral syndromes, and mtDNA deletion disorders, such as progressive external ophthalmoplegia (PEO), ataxia-neuropathy, or mitochondrial neurogastrointestinal encephalomyopathy (MNGIE). This review focuses on our current knowledge of genetic defects of mtDNA replication (POLG, POLG2, C10orf2) and nucleotide metabolism (TYMP, TK2, DGOUK, and RRM2B) that cause instability of mtDNA and mitochondrial disease.
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Affiliation(s)
- William C Copeland
- Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, Durham, North Carolina 27709, USA.
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Hirano M, Garone C, Quinzii CM. CoQ(10) deficiencies and MNGIE: two treatable mitochondrial disorders. Biochim Biophys Acta Gen Subj 2012; 1820:625-31. [PMID: 22274133 DOI: 10.1016/j.bbagen.2012.01.006] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2011] [Revised: 12/28/2011] [Accepted: 01/10/2012] [Indexed: 12/25/2022]
Abstract
BACKGROUND Although causative mutations have been identified for numerous mitochondrial disorders, few disease-modifying treatments are available. Two examples of treatable mitochondrial disorders are coenzyme Q(10) (CoQ(10) or ubiquinone) deficiency and mitochondrial neurogastrointestinal encephalomyopathy (MNGIE). SCOPE OF REVIEW Here, we describe clinical and molecular features of CoQ(10) deficiencies and MNGIE and explain how understanding their pathomechanisms have led to rationale therapies. Primary CoQ(10) deficiencies, due to mutations in genes required for ubiquinone biosynthesis, and secondary deficiencies, caused by genetic defects not directly related to CoQ(10) biosynthesis, often improve with CoQ(10) supplementation. In vitro and in vivo studies of CoQ(10) deficiencies have revealed biochemical alterations that may account for phenotypic differences among patients and variable responses to therapy. In contrast to the heterogeneous CoQ(10) deficiencies, MNGIE is a single autosomal recessive disease due to mutations in the TYMP gene encoding thymidine phosphorylase (TP). In MNGIE, loss of TP activity causes toxic accumulations of the nucleosides thymidine and deoxyuridine that are incorporated by the mitochondrial pyrimidine salvage pathway and cause deoxynucleoside triphosphate pool imbalances, which, in turn cause mtDNA instability. Allogeneic hematopoetic stem cell transplantation to restore TP activity and eliminate toxic metabolites is a promising therapy for MNGIE. MAJOR CONCLUSIONS CoQ(10) deficiencies and MNGIE demonstrate the feasibility of treating specific mitochondrial disorders through replacement of deficient metabolites or via elimination of excessive toxic molecules. GENERAL SIGNIFICANCE Studies of CoQ(10) deficiencies and MNGIE illustrate how understanding the pathogenic mechanisms of mitochondrial diseases can lead to meaningful therapies. This article is part of a Special Issue entitled: Biochemistry of Mitochondria, Life and Intervention 2010.
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Affiliation(s)
- Michio Hirano
- Department of Neurology, Columbia University Medical Center, New York, NY 10032, USA
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Finsterer J. Inherited Mitochondrial Disorders. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 942:187-213. [DOI: 10.1007/978-94-007-2869-1_8] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Garone C, Tadesse S, Hirano M. Clinical and genetic spectrum of mitochondrial neurogastrointestinal encephalomyopathy. ACTA ACUST UNITED AC 2011; 134:3326-32. [PMID: 21933806 DOI: 10.1093/brain/awr245] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Mitochondrial neurogastrointestinal encephalomyopathy is a rare multisystemic autosomic recessive disorder characterized by: onset typically before the age of 30 years; ptosis; progressive external ophthalmoplegia; gastrointestinal dysmotility; cachexia; peripheral neuropathy; and leucoencephalopathy. The disease is caused by mutations in the TYMP gene encoding thymidine phosphorylasethymine phosphorylase. Anecdotal reports suggest that allogeneic haematopoetic stem cell transplantation may be beneficial for mitochondrial neurogastrointestinal encephalomyopathy, but is associated with a high mortality. After selecting patients who fulfilled the clinical criteria for mitochondrial neurogastrointestinal encephalomyopathy and had severe thymidine phosphorylase deficiency in the buffy coat (<10% of normal activity), we reviewed their medical records and laboratory studies. We identified 102 patients (50 females) with mitochondrial neurogastrointestinal encephalomyopathy and an average age of 32.4 years (range 11-59 years). We found 20 novel TYMP mutations. The average age-at-onset was 17.9 years (range 5 months to 35 years); however, the majority of patients reported the first symptoms before the age of 12 years. The patient distribution suggests a relatively high prevalence in Europeans, while the mutation distribution suggests founder effects for a few mutations, such as c.866A>G in Europe and c.518T>G in the Dominican Republic, that could guide genetic screening in each location. Although the sequence of clinical manifestations in the disease varied, half of the patients initially had gastrointestinal symptoms. We confirmed anecdotal reports of intra- and inter-familial clinical variability and absence of genotype-phenotype correlation in the disease, suggesting genetic modifiers, environmental factors or both contribute to disease manifestations. Acute medical events such as infections often provoked worsening of symptoms, suggesting that careful monitoring and early treatment of intercurrent illnesses may be beneficial. We observed endocrine/exocrine pancreatic insufficiency, which had not previously been reported. Kaplan-Meier analysis revealed significant mortality between the ages of 20 and 40 years due to infectious or metabolic complications. Despite increasing awareness of this illness, a high proportion of patients had been misdiagnosed. Early and accurate diagnosis of mitochondrial neurogastrointestinal encephalomyopathy, together with timely treatment of acute intercurrent illnesses, may retard disease progression and increase the number of patients eligible for allogeneic haematopoetic stem cell transplantation.
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Affiliation(s)
- Caterina Garone
- Department of Neurology, Columbia University Medical Centre, New York, NY 10032, USA
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Saito K, Kimura N, Oda N, Shimomura H, Kumada T, Miyajima T, Murayama K, Tanaka M, Fujii T. Pyruvate therapy for mitochondrial DNA depletion syndrome. Biochim Biophys Acta Gen Subj 2011; 1820:632-6. [PMID: 21855607 DOI: 10.1016/j.bbagen.2011.08.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 08/03/2011] [Accepted: 08/05/2011] [Indexed: 11/30/2022]
Abstract
BACKGROUND Mitochondrial DNA depletion syndromes are a group of heterogeneous autosomal recessive disorders associated with a severe reduction in mitochondrial DNA in the affected tissues. Sodium pyruvate has been reported to have a therapeutic effect in mitochondrial diseases. METHODS We analyzed the effects of 0.5g/kg of sodium pyruvate administered through a nasogastric tube in a one-year-old patient with myopathic mitochondrial DNA depletion syndrome. To evaluate the improvement, we used the Newcastle Paediatric Mitochondrial Disease Scale (NPMDS) and manual muscle testing. As the improvement of motor functions in this severely disabled infant could not be comprehensively detected by NPMDS, we also observed the infant's ability to perform several tasks such as pouting, winking, and number of times she could tap a toy xylophone with a stick. Blood lactate and pyruvate levels were also monitored. RESULTS After one month's treatment, the NPMDS score in section IV, the domain for the quality of life, improved from 17 to13. The infant became capable of raising her forearm, lower leg and wrist against gravity. The maximum number of times she could repeat each task increased and the movements became brisker and stronger. No significant change of the blood lactate level or lactate-to-pyruvate ratio, both of which were mildly increased at the initiation of the therapy, was observed despite the clinical improvement. CONCLUSION Sodium pyruvate administered at 0.5g/kg improved the muscle strength and the NPMDS score of an infant with myopathic mitochondrial DNA depletion syndrome. GENERAL SIGNIFICANCE Sodium pyruvate may be effective for ameliorating the clinical manifestations of mitochondrial diseases. This article is part of a Special Issue entitled: Biochemistry of Mitochondria.
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Affiliation(s)
- Keiko Saito
- Department of Pediatrics, Shiga Medical Center for Children, Moriyama-City, Shiga, Japan.
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Spinazzola A. Mitochondrial DNA mutations and depletion in pediatric medicine. Semin Fetal Neonatal Med 2011; 16:190-6. [PMID: 21652274 DOI: 10.1016/j.siny.2011.04.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Mitochondrial disorders are a group of diseases traditionally ascribed to defects of the respiratory chain, which is the only metabolic pathway in the cell that is under the control of the two separate genetic systems, the mitochondrial genome (mtDNA) and the nuclear genome (nDNA). Therefore the genetic classification of the primary mitochondrial diseases distinguishes disorders due to mutations in mtDNA, which are sporadic or maternal inherited, from disorders due to mutations in nDNA, which are governed by the stricter rules of mendelian genetics. Pathological alterations of mtDNA fall into two main categories: primary mutations of mitochondrial DNA (point mutations and rearrangements) and mtDNA perturbation, due to mutations in nuclear genes whose products are involved in mtDNA maintenance or replication. This article will focus on the primary mitochondrial DNA mutations and mtDNA depletion syndromes related to neonatal-infant human pathology.
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Affiliation(s)
- A Spinazzola
- MRC, Mitochondrial Biology Unit, Wellcome Trust, MRC Building, Hills Road, Cambridge CB2 0XY, UK.
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