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Smith IC, Chakraborty S, Bourque PR, Sampaio ML, Melkus G, Lochmüller H, Woulfe J, Parks RJ, Brais B, Warman-Chardon J. Emerging and established biomarkers of oculopharyngeal muscular dystrophy. Neuromuscul Disord 2023; 33:824-834. [PMID: 37926637 DOI: 10.1016/j.nmd.2023.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/25/2023] [Accepted: 09/27/2023] [Indexed: 11/07/2023]
Abstract
Oculopharyngeal muscular dystrophy (OPMD) is a rare, primarily autosomal dominant, late onset muscular dystrophy commonly presenting with ptosis, dysphagia, and subsequent weakness of proximal muscles. Although OPMD diagnosis can be confirmed with high confidence by genetic testing, the slow progression of OPMD poses a significant challenge to clinical monitoring and a barrier to assessing the efficacy of treatments during clinical trials. Accordingly, there is a pressing need for more sensitive measures of OPMD progression, particularly those which do not require a muscle biopsy. This review provides an overview of progress in OPMD biomarkers from clinical assessment, quantitative imaging, histological assessments, and genomics, as well as hypothesis-generating "omics" approaches. The ongoing search for biomarkers relevant to OPMD progression needs an integrative, longitudinal approach combining validated and experimental approaches which may include clinical, imaging, demographic, and biochemical assessment methods. A multi-omics approach to biochemical biomarker discovery could help provide context for differences found between individuals with varying levels of disease activity and provide insight into pathomechanisms and prognosis of OPMD.
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Affiliation(s)
- Ian C Smith
- The Ottawa Hospital Research Institute, Ottawa, ON K1Y 4E9, Canada
| | | | - Pierre R Bourque
- Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada; Department of Medicine, The Ottawa Hospital/University of Ottawa, Ottawa, ON K1H 8L6, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada
| | - Marcos L Sampaio
- Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada; Department of Medical Imaging, The Ottawa Hospital, Ottawa, Ontario K1Y 4E9, Canada; Department of Radiology, Radiation Oncology and Medical Physics, University of Ottawa, Ottawa, ON K1H 8L6, Canada
| | - Gerd Melkus
- Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada; Department of Medical Imaging, The Ottawa Hospital, Ottawa, Ontario K1Y 4E9, Canada; Department of Physics, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Hanns Lochmüller
- The Ottawa Hospital Research Institute, Ottawa, ON K1Y 4E9, Canada; Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada; Department of Medicine, The Ottawa Hospital/University of Ottawa, Ottawa, ON K1H 8L6, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada; Genetics, Children's Hospital of Eastern Ontario, Ottawa, ON K1H 8L1, Canada
| | - John Woulfe
- The Ottawa Hospital Research Institute, Ottawa, ON K1Y 4E9, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada; Department of Pathology and Laboratory Medicine, The Ottawa Hospital, Ottawa, ON K1Y 4E9, Canada
| | - Robin J Parks
- The Ottawa Hospital Research Institute, Ottawa, ON K1Y 4E9, Canada; Department of Medicine, The Ottawa Hospital/University of Ottawa, Ottawa, ON K1H 8L6, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada
| | - Bernard Brais
- Montreal Neurological Institute and Hospital, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Jodi Warman-Chardon
- The Ottawa Hospital Research Institute, Ottawa, ON K1Y 4E9, Canada; Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada; Department of Medicine, The Ottawa Hospital/University of Ottawa, Ottawa, ON K1H 8L6, Canada; Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON K1Y 4E9, Canada; Genetics, Children's Hospital of Eastern Ontario, Ottawa, ON K1H 8L1, Canada; Montreal Neurological Institute and Hospital, McGill University, Montreal, Quebec H3A 2B4, Canada.
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2
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Infante JM, Nepomuceno BL. Choked: A Case Report of Oculopharyngeal Muscular Dystrophy Mimicking Hypothyroidism From the Philippines. Cureus 2023; 15:e41025. [PMID: 37519616 PMCID: PMC10373107 DOI: 10.7759/cureus.41025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/2023] [Indexed: 08/01/2023] Open
Abstract
Oculopharyngeal muscular dystrophy (OPMD) is a late-onset myopathic genetic disorder characterized by chronic progressive dysphagia and ptosis with or without proximal limb weakness. It is most often caused by an abnormal alanine-encoding (GCN) trinucleotide repeat expansion in the first exon of the poly(A)-binding protein nuclear 1 (PABPN1) gene. Patients with hypothyroidism may similarly report bilateral ptosis, dysphagia, and limb weakness. Here, we report the case of a 65-year-old Austrian female with hypothyroidism living in the Philippines who presented with gradually progressive ptosis, dysphagia, and intermittent choking episodes. No known relatives had similar symptoms. Physical examination showed bilateral symmetric ptosis, good cough reflex, and good limb muscle strength. Electromyographic studies of facial and laryngeal muscles were found to be normal. Thyroid evaluation showed biochemically hyperthyroid status while taking Levothyroxine. With a clinical suspicion for genetic progressive myopathy, we considered OPMD. Genetic testing revealed abnormal expansion of GCN trinucleotide repeats in the PABPN1 gene. We describe the first reported case of OPMD with detected PABPN1 gene expansion in the Philippines simulating hypothyroidism symptoms, suggesting possible points for misidentification and underdiagnosis of OPMD in developing countries.
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Affiliation(s)
- Jerome M Infante
- Institute for Neurosciences, Section of Neurology, St. Luke's Medical Center, Quezon City, PHL
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Melkus G, Sampaio ML, Smith IC, Rakhra KS, Bourque PR, Breiner A, Zwicker J, Lochmüller H, Brais B, Warman-Chardon J. Quantitative vs qualitative muscle MRI: Imaging biomarker in patients with Oculopharyngeal Muscular Dystrophy (OPMD). Neuromuscul Disord 2023; 33:24-31. [PMID: 36462961 DOI: 10.1016/j.nmd.2022.09.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 08/19/2022] [Accepted: 09/30/2022] [Indexed: 01/28/2023]
Abstract
Oculopharyngeal muscular dystrophy (OPMD) is a genetic muscle disease causing ptosis, severe swallowing difficulties and progressive limb weakness, although atypical presentations may be difficult to diagnose. Sensitive biomarkers of disease progression in OPMD are needed to enable more effective clinical trials. This study was designed to test the feasibility of using MRI to aid OPMD diagnosis and monitor OPMD progression. Twenty-five subjects with Dixon whole-body muscle MRI were enrolled: 10 patients with genetically confirmed OPMD, 10 patients with non-OPMD muscular dystrophies, and 5 controls. Using the MRI Dixon technique, muscle fat replacement was evaluated in the tongue, serratus anterior, lumbar paraspinal, adductor magnus, and soleus muscles using quantitative and semi-quantitative rating methods. Changes were compared with muscle strength testing, dysphagia severity, use of gait aids, and presence of dysarthria. Quantitative MRI scores of muscle fat replacement in the tongue could differentiate OPMD from other muscular dystrophies and from controls. Moreover, fat fraction in the tongue correlated with clinical severity of dysphagia. This study provides preliminary support for the use of Dixon-based quantitative MRI images as outcome measures for monitoring disease progression in clinical trials and provides rationale for future prospective studies aimed at methodological refinement and covariate identification.
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Affiliation(s)
- Gerd Melkus
- Department of Radiology, Radiation Oncology and Medical Physics, University of, Ottawa, Ottawa, ON, Canada; Ottawa Hospital Research Institute, Ottawa, ON, Canada; Department of Physics, Carleton University, Ottawa, ON, Canada
| | - Marcos L Sampaio
- Department of Radiology, Radiation Oncology and Medical Physics, University of, Ottawa, Ottawa, ON, Canada; Ottawa Hospital Research Institute, Ottawa, ON, Canada; Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada
| | - Ian C Smith
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Kawan S Rakhra
- Department of Radiology, Radiation Oncology and Medical Physics, University of, Ottawa, Ottawa, ON, Canada; Ottawa Hospital Research Institute, Ottawa, ON, Canada; Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada
| | - Pierre R Bourque
- Ottawa Hospital Research Institute, Ottawa, ON, Canada; Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada; Department of Medicine (Neurology), The Ottawa Hospital/The University of Ottawa
| | - Ari Breiner
- Ottawa Hospital Research Institute, Ottawa, ON, Canada; Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada; Department of Medicine (Neurology), The Ottawa Hospital/The University of Ottawa
| | - Jocelyn Zwicker
- Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada; Department of Medicine (Neurology), The Ottawa Hospital/The University of Ottawa
| | - Hanns Lochmüller
- Ottawa Hospital Research Institute, Ottawa, ON, Canada; Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada; Department of Medicine (Neurology), The Ottawa Hospital/The University of Ottawa; Genetics, Children's Hospital of Eastern Ontario, Ottawa, ON, Canada
| | - Bernard Brais
- Montreal Neurological Institute and Hospital, Genetics, McGill University, Montreal, Quebec, Canada
| | - Jodi Warman-Chardon
- Ottawa Hospital Research Institute, Ottawa, ON, Canada; Faculty of Medicine /Eric Poulin Centre for Neuromuscular Disease, University of Ottawa, Ottawa, ON, Canada; Department of Medicine (Neurology), The Ottawa Hospital/The University of Ottawa; Genetics, Children's Hospital of Eastern Ontario, Ottawa, ON, Canada.
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Zhang Y, Zeuthen C, Zhu C, Wu F, Mezzell AT, Whitlow TJ, Choo HJ, Vest KE. Pharyngeal pathology in a mouse model of oculopharyngeal muscular dystrophy is associated with impaired basal autophagy in myoblasts. Front Cell Dev Biol 2022; 10:986930. [PMID: 36313551 PMCID: PMC9614327 DOI: 10.3389/fcell.2022.986930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 09/26/2022] [Indexed: 11/05/2023] Open
Abstract
Oculopharyngeal muscular dystrophy (OPMD) is a late-onset dominant disease that primarily affects craniofacial muscles. Despite the fact that the genetic cause of OPMD is known to be expansion mutations in the gene encoding the nuclear polyadenosine RNA binding protein PABPN1, the molecular mechanisms of pathology are unknown and no pharmacologic treatments are available. Due to the limited availability of patient tissues, several animal models have been employed to study the pathology of OPMD. However, none of these models have demonstrated functional deficits in the muscles of the pharynx, which are predominantly affected by OPMD. Here, we used a knock-in mouse model of OPMD, Pabpn1 +/A17 , that closely genocopies patients. In Pabpn1 +/A17 mice, we detected impaired pharyngeal muscle function, and impaired pharyngeal satellite cell proliferation and fusion. Molecular studies revealed that basal autophagy, which is required for normal satellite cell function, is higher in pharynx-derived myoblasts than in myoblasts derived from limb muscles. Interestingly, basal autophagy is impaired in cells derived from Pabpn1 +/A17 mice. Pabpn1 knockdown in pharyngeal myoblasts failed to recapitulate the autophagy defect detected in Pabpn1 +/A17 myoblasts suggesting that loss of PABPN1 function does not contribute to the basal autophagy defect. Taken together, these studies provide the first evidence for pharyngeal muscle and satellite cell pathology in a mouse model of OPMD and suggest that aberrant gain of PABPN1 function contributes to the craniofacial pathology in OPMD.
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Affiliation(s)
- Yu Zhang
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Christopher Zeuthen
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA, United States
| | - Carol Zhu
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA, United States
| | - Fang Wu
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA, United States
| | - Allison T. Mezzell
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Thomas J. Whitlow
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Hyojung J. Choo
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA, United States
| | - Katherine E. Vest
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH, United States
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Alonso-Pérez J, de León Hernández JC, Pérez-Pérez H, Mendoza-Grimón MD, Gutierrez-Martinez AJ, Hadjigeorgiou I, Montón-Álvarez F, González-Quereda L, Alonso-Jimenez A, Suárez-Calvet X, Díaz-Manera J. Clinical and genetic features of a large homogeneous cohort of oculopharyngeal muscular dystrophy patients from the Canary Islands. Eur J Neurol 2022; 29:1488-1495. [PMID: 35112761 DOI: 10.1111/ene.15252] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/30/2021] [Accepted: 01/10/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Oculopharyngeal muscular dystrophy (OPMD) is an autosomal dominant, late-onset myopathy characterized by ptosis, dysphagia, and progressive proximal limb muscle weakness. The disease is produced by a short expansion of the (GCN)n triplet in the PABPN1 gene. The size of expansion has been correlated to the disease onset and severity. We report the clinical features of a large cohort of OPMD patients harboring the (GCN)15 allele from the Canary Islands. METHODS A retrospective observational study was performed analyzing the clinical, demographic, and genetic data of 123 OPMD patients. Clinical data from this cohort were compared with clinical data collected in a large European study including 139 OPMD patients. RESULTS A total of 113 patients (94.2%) carried the (GCN)15 expanded PABN1 allele. Age of symptoms' onset was 45.1 years. The most frequent symptom at onset was ptosis (85.2%) followed by dysphagia (12%). The severity of the disease was milder in the Canary cohort compared to European patients as limb weakness (35.1% vs. 50.4%), the proportion of patients that require assistance for walking or use a wheelchair (9.3% vs. 27.4%), and needed of surgery because of severe dysphagia (4.6% vs. 22.8%) was higher in the European cohort. CONCLUSIONS Nearly 95% of patients with OPMD from the Canary Islands harbored the (GCN)15 expanded allele supporting a potential founder effect. Disease progression seemed to be milder in the (GCN)15 OPMD Canary cohort than in other cohorts with shorter expansions suggesting that other factors, apart from the expansion size, could be involved in the progression of the disease.
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Affiliation(s)
- Jorge Alonso-Pérez
- Neuromuscular Diseases Unit, Department of Neurology, Department of Medicine, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain.,Department of Neurology, Hospital Universitario Nuestra Señora de la Candelaria, Santa Cruz de Tenerife, Spain
| | | | - Helena Pérez-Pérez
- Department of Neurology, Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain
| | - María Dolores Mendoza-Grimón
- Department of Neurology, Hospital Universitario de Gran Canaria Doctor Negrín, Las Palmas de Gran Canaria, Spain
| | | | | | - Fernando Montón-Álvarez
- Department of Neurology, Hospital Universitario Nuestra Señora de la Candelaria, Santa Cruz de Tenerife, Spain
| | - Lidia González-Quereda
- Genetics Department, IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Valencia, Spain
| | - Alicia Alonso-Jimenez
- Neuromuscular Reference Center, Department of Neurology, Antwerp University Hospital, Antwerp, Belgium
| | - Xavier Suárez-Calvet
- Neuromuscular Diseases Unit, Department of Neurology, Department of Medicine, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Valencia, Spain
| | - Jordi Díaz-Manera
- Neuromuscular Diseases Unit, Department of Neurology, Department of Medicine, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Valencia, Spain.,John Walton Muscular Dystrophy Research Centre, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
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Yamashita S. Recent Progress in Oculopharyngeal Muscular Dystrophy. J Clin Med 2021; 10:jcm10071375. [PMID: 33805441 PMCID: PMC8036457 DOI: 10.3390/jcm10071375] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/18/2021] [Accepted: 03/26/2021] [Indexed: 12/23/2022] Open
Abstract
Oculopharyngeal muscular dystrophy (OPMD) is a late-onset intractable myopathy, characterized by slowly progressive ptosis, dysphagia, and proximal limb weakness. It is caused by the abnormal expansion of the alanine-encoding (GCN)n trinucleotide repeat in the exon 1 of the polyadenosine (poly[A]) binding protein nuclear 1 gene (11-18 repeats in OPMD instead of the normal 10 repeats). As the disease progresses, the patients gradually develop a feeling of suffocation, regurgitation of food, and aspiration pneumonia, although the initial symptoms and the progression patterns vary among the patients. Autologous myoblast transplantation may provide therapeutic benefits by reducing swallowing problems in these patients. Therefore, it is important to assemble information on such patients for the introduction of effective treatments in nonendemic areas. Herein, we present a concise review of recent progress in clinical and pathological studies of OPMD and introduce an idea for setting up a nation-wide OPMD disease registry in Japan. Since it is important to understand patients' unmet medical needs, realize therapeutically targetable symptoms, and identify indices of therapeutic efficacy, our attempt to establish a unique patient registry of OPMD will be a helpful tool to address these urgent issues.
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Affiliation(s)
- Satoshi Yamashita
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan
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The man who could not see what he could not eat. Surv Ophthalmol 2011; 56:461-5. [PMID: 21371731 DOI: 10.1016/j.survophthal.2010.11.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 11/18/2010] [Accepted: 11/23/2010] [Indexed: 11/23/2022]
Abstract
A 55-year-old Hispanic man born in New Mexico presented with progressively worsening bilateral upper eyelid ptosis and dysphagia. External levator advancement 5 years before did not improve his ptosis. A thorough systemic workup for myasthenia gravis was negative, but electromyography suggested a myopathic process. Molecular genetic testing was positive for oculopharyngeal muscular dystrophy.
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Pellerin HG, Nicole PC, Trépanier CA, Lessard MR. Postoperative complications in patients with oculopharyngeal muscular dystrophy: a retrospective study. Can J Anaesth 2007; 54:361-5. [PMID: 17470887 DOI: 10.1007/bf03022658] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Oculopharyngeal muscular dystrophy (OPMD) is a genetic disease with autosomal dominant transmission particularly common in Quebec where its prevalence is about 1:1000. The main features are bilateral ptosis of the eyelids and dysphagia. These symptoms are frequently treated surgically by levator palpebrae resection (LPR) and cricopharyngeal myotomy (CPM). The objectives of this retrospective chart review were to describe the postoperative complications in OPMD patients undergoing LPR or CPM and to determine their incidence. METHODS Medical records of all OPMD patients who had either LPR or CPM between 1997 and 2002 were reviewed. The following complications were collected: death, pneumonia, aspiration pneumonitis, airway obstruction, reintubation, and severe coughing and choking caused by profuse secretions. RESULTS One hundred and fourteen surgeries on 92 OPMD patients were studied. Fifty-nine were LPR under general anesthesia (LPR-GA) and 22 were LPR under local anesthesia (LPR-LA). Thirty-three surgeries were CPM, all under general anesthesia. There was no death or reintubation. Patients who had LPR-LA had shorter postanesthesia care unit (P<0.001) and ambulatory surgery unit (P<0.001) stays than those who had LPR-GA. Complications were more frequent after CPM than LPR-GA (P<0.001). CONCLUSION The complication rate after LPR was low. Both local and general anesthesia are safe alternatives in OPMD patients operated for LPR. Patients having CPM presented more respiratory complications than those having LPR.
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Affiliation(s)
- Hélène G Pellerin
- Département d'anesthésie-réanimation, CHA (Hôpital de l'Enfant-Jésus), 1401, 18e rue, Québec, Québec G1J 1Z4, Canada.
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9
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Périé S, Mamchaoui K, Mouly V, Blot S, Bouazza B, Thornell LE, St Guily JL, Butler-Browne G. Premature proliferative arrest of cricopharyngeal myoblasts in oculo-pharyngeal muscular dystrophy: Therapeutic perspectives of autologous myoblast transplantation. Neuromuscul Disord 2006; 16:770-81. [PMID: 17005403 DOI: 10.1016/j.nmd.2006.07.022] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2005] [Revised: 05/19/2006] [Accepted: 07/05/2006] [Indexed: 11/29/2022]
Abstract
Cultures of myoblasts isolated from cricopharyngeal muscles from patients with oculopharyngeal muscular dystrophy (OPMD) have been performed to study the effect of the expanded (GCG)8-13 repeat, located on the poly(A) binding protein nuclear-1 (PABPN1), on satellite cell phenotype. Cell cultures exhibited a reduced myogenicity, as well as a rapid decrease in proliferative lifespan, as compared to controls. The incorporation of BrdU decreased during the proliferative lifespan, due to a progressive accumulation of non-dividing cells. A lower fusion index was also observed, but myoblasts were able to form large myotubes when OPMD cultures were purified, although a rapid loss of myogenicity during successive passages was also observed. Myoblasts isolated from unaffected muscles did not show the defects observed in cricopharyngeal muscle cultures. The PABPN1 was predominantly located in nuclei of myoblasts and in both the nuclei and cytoplasm of myotubes in OPMD cultures. In vivo analysis of OPMD muscles showed that the number of satellite cells was slightly higher than that observed in age matched controls. Mutation of the PABPN1 in OPMD provokes premature senescence in dividing myoblasts, that may be due to intranuclear toxic aggregates. These results suggest that myoblast autografts, isolated from unaffected muscles, and injected into the dystrophic pharyngeal muscles, may be a useful therapeutic strategy to restore muscular function. Its tolerance and feasibility has been preclinically demonstrated in the dog.
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Affiliation(s)
- Sophie Périé
- Inserm U787 Groupe Myologie and Institut de Myologie, Faculté de Médecine Pitié Salpêtrière, Université Paris VI Pierre et Marie Curie, 105, Boulevard de l'Hôpital, 75013 Paris, France.
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10
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Rodríguez M, Camejo C, Bertoni B, Braida C, Rodríguez MM, Brais B, Medici M, Roche L. (GCG)11 founder mutation in the PABPN1 gene of OPMD Uruguayan families. Neuromuscul Disord 2005; 15:185-90. [PMID: 15694141 DOI: 10.1016/j.nmd.2004.10.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2004] [Revised: 10/20/2004] [Accepted: 10/27/2004] [Indexed: 10/26/2022]
Abstract
The dominant oculo-pharyngeal muscular dystrophy mutation consists of an expanded (GCN)(12-17) in the coding region of the PolyA Binding Protein Nuclear 1 gene. A founder effect has been demonstrated in Canadian and Bukhara Jewish populations with relatively high prevalence of this disease. Since the oculo-pharyngeal muscular dystrophy prevalence was remarkably high in Southern Uruguay, a founder effect was hypothesized. To identify the ancestral haplotype we determined the (GCN) repeat number and the variants of four intragenic SNPs in Uruguayan OPMD families and a control sample. All families carrying the mutation (GCG)(11)(GCA)(3)(GCG) shared a common ancestral haplotype and the age of the mutation was estimated in 37-53 generations by a composite likelihood method. One family carrying the (GCG)(9)(GCA)(3)(GCG) allele had a different haplotype. The genealogical and molecular data suggested that the common ancestors were Canary Islands' settlers that arrived in Uruguay in the XIX century.
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Affiliation(s)
- M Rodríguez
- Departamento de Genética, Facultad de Medicina, Universidad de la República, Avda. Gral. Flores 2125, 11800 Montevideo, Uruguay
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11
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Scacheri PC, Garcia C, H�bert R, Hoffman EP. Unique PABP2 mutations in ?Cajuns? suggest multiple founders of oculopharyngeal muscular dystrophy in populations with French ancestry. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1096-8628(19991029)86:5<477::aid-ajmg14>3.0.co;2-a] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Rodrigue D, Molgat YM. Surgical correction of blepharoptosis in oculopharyngeal muscular dystrophy. Neuromuscul Disord 1997; 7 Suppl 1:S82-4. [PMID: 9392022 DOI: 10.1016/s0960-8966(97)00088-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Progressive, usually symmetric blepharoptosis with or without dysphagia appears in most instances in the fifth decade in oculopharyngeal muscular dystrophy (OPMD). We review our experience over 20 years of applying Beard's surgical guidelines for correction of ptosis to OPMD patients with satisfactory results. As the disease continues to progress, the rate of recurrence of ptosis among follow-up patients of a 9-year minimum period was 13%.
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Affiliation(s)
- D Rodrigue
- Département d'ophtalmologie, Hôpital de l'Enfant-Jésus, Quebec, Canada
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