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Muñoz-García MI, Guerrero-Molina MP, de Fuenmayor-Fernández de la Hoz CP, Bermejo-Guerrero L, Arteche-López A, Hernández-Laín A, Martín MA, Domínguez-González C. Delayed Diagnosis of Congenital Myasthenic Syndromes Erroneously Interpreted as Mitochondrial Myopathies. J Clin Med 2023; 12:jcm12093308. [PMID: 37176748 PMCID: PMC10179722 DOI: 10.3390/jcm12093308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 04/02/2023] [Accepted: 05/04/2023] [Indexed: 05/15/2023] Open
Abstract
BACKGROUND Congenital myasthenic syndromes (CMSs) and primary mitochondrial myopathies (PMMs) can present with ptosis, external ophthalmoplegia, and limb weakness. METHODS Our method involved the description of three cases of CMS that were initially characterized as probable PMM. RESULTS All patients were male and presented with ptosis and/or external ophthalmoplegia at birth, with proximal muscle weakness and fatigue on physical exertion. After normal repetitive nerve stimulation (RNS) studies performed on facial muscles, a muscle biopsy (at a median age of 9) was performed to rule out congenital myopathies. In all three cases, the biopsy findings (COX-negative fibers or respiratory chain defects) pointed to PMM. They were referred to our neuromuscular unit in adulthood to establish a genetic diagnosis. However, at this time, fatigability was evident in the physical exams and RNS in the spinal accessory nerve showed a decremental response in all cases. Targeted genetic studies revealed pathogenic variants in the MUSK, DOK7, and RAPSN genes. The median diagnostic delay was 29 years. Treatment resulted in functional improvement in all cases. CONCLUSIONS Early identification of CMS is essential as medical treatment can provide clear benefits. Its diagnosis can be challenging due to phenotypic overlap with other debilitating disorders. Thus, a high index of suspicion is necessary to guide the diagnostic strategy.
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Affiliation(s)
- Mariana I Muñoz-García
- Neuromuscular Unit, Neurology Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | | | | | - Laura Bermejo-Guerrero
- Neuromuscular Unit, Neurology Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | - Ana Arteche-López
- Genetics Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | | | - Miguel A Martín
- Genetics Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
- Spanish Network for Biomedical Research in Rare Diseases (CIBERER), 28041 Madrid, Spain
- Mitochondrial and Neuromuscular Diseases Research Group, 12 de Octubre, Hospital Research Institute (imas12), 28041 Madrid, Spain
| | - Cristina Domínguez-González
- Neuromuscular Unit, Neurology Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
- Spanish Network for Biomedical Research in Rare Diseases (CIBERER), 28041 Madrid, Spain
- Mitochondrial and Neuromuscular Diseases Research Group, 12 de Octubre, Hospital Research Institute (imas12), 28041 Madrid, Spain
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Bermejo-Guerrero L, de Fuenmayor-Fernández de la Hoz CP, Serrano-Lorenzo P, Blázquez-Encinar A, Gutiérrez-Gutiérrez G, Martínez-Vicente L, Galán-Dávila L, García-García J, Arenas J, Muelas N, Hernández-Laín A, Domínguez-González C, Martín MA. Clinical, Histological, and Genetic Features of 25 Patients with Autosomal Dominant Progressive External Ophthalmoplegia (ad-PEO)/PEO-Plus Due to TWNK Mutations. J Clin Med 2021; 11:jcm11010022. [PMID: 35011763 PMCID: PMC8745442 DOI: 10.3390/jcm11010022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/16/2021] [Accepted: 12/20/2021] [Indexed: 11/28/2022] Open
Abstract
Autosomal dominant mutations in the TWNK gene, which encodes a mitochondrial DNA helicase, cause adult-onset progressive external ophthalmoplegia (PEO) and PEO-plus presentations. In this retrospective observational study, we describe clinical and complementary data from 25 PEO patients with mutations in TWNK recruited from the Hospital 12 de Octubre Mitochondrial Disorders Laboratory Database. The mean ages of onset and diagnosis were 43 and 63 years, respectively. Family history was positive in 22 patients. Ptosis and PEO (92% and 80%) were the most common findings. Weakness was present in 48%, affecting proximal limbs, neck, and bulbar muscles. Exercise intolerance was present in 28%. Less frequent manifestations were cardiac (24%) and respiratory (4%) involvement, neuropathy (8%), ataxia (4%), and parkinsonism (4%). Only 28% had mild hyperCKemia. All 19 available muscle biopsies showed signs of mitochondrial dysfunction. Ten different TWNK mutations were identified, with c.1361T>G (p.Val454Gly) and c.1070G>C (p.Arg357Pro) being the most common. Before definitive genetic confirmation, 56% of patients were misdiagnosed (36% with myasthenia, 20% with oculopharyngeal muscle dystrophy). Accurate differential diagnosis and early confirmation with appropriately chosen complementary studies allow genetic counseling and the avoidance of unnecessary treatments. Thus, mitochondrial myopathies must be considered in PEO/PEO-plus presentations, and particularly, TWNK is an important cause when positive family history is present.
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Affiliation(s)
- Laura Bermejo-Guerrero
- Neuromuscular Unit, Department of Neurology, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain; (L.B.-G.); (C.P.d.F.-F.d.l.H.)
| | | | - Pablo Serrano-Lorenzo
- Hospital 12 de Octubre Research Institute (imas12), 28041 Madrid, Spain; (P.S.-L.); (A.B.-E.); (J.A.); (A.H.-L.); (M.A.M.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain;
- Mitochondrial Disorders Laboratory, Clinical Biochemistry Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | - Alberto Blázquez-Encinar
- Hospital 12 de Octubre Research Institute (imas12), 28041 Madrid, Spain; (P.S.-L.); (A.B.-E.); (J.A.); (A.H.-L.); (M.A.M.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain;
- Mitochondrial Disorders Laboratory, Clinical Biochemistry Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | | | - Laura Martínez-Vicente
- Department of Neurology, Hospital Universitario Clínico San Carlos, 28040 Madrid, Spain; (L.M.-V.); (L.G.-D.)
| | - Lucía Galán-Dávila
- Department of Neurology, Hospital Universitario Clínico San Carlos, 28040 Madrid, Spain; (L.M.-V.); (L.G.-D.)
| | - Jorge García-García
- Department of Neurology, Complejo Hospitalario Universitario de Albacete, 02006 Albacete, Spain;
| | - Joaquín Arenas
- Hospital 12 de Octubre Research Institute (imas12), 28041 Madrid, Spain; (P.S.-L.); (A.B.-E.); (J.A.); (A.H.-L.); (M.A.M.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain;
- Mitochondrial Disorders Laboratory, Clinical Biochemistry Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | - Nuria Muelas
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain;
- Neuromuscular Unit, Department of Neurology, Hospital Universitari I Politècnic La Fe, 46026 Valencia, Spain
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Aurelio Hernández-Laín
- Hospital 12 de Octubre Research Institute (imas12), 28041 Madrid, Spain; (P.S.-L.); (A.B.-E.); (J.A.); (A.H.-L.); (M.A.M.)
- Department of Neuropathology, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
| | - Cristina Domínguez-González
- Neuromuscular Unit, Department of Neurology, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain; (L.B.-G.); (C.P.d.F.-F.d.l.H.)
- Hospital 12 de Octubre Research Institute (imas12), 28041 Madrid, Spain; (P.S.-L.); (A.B.-E.); (J.A.); (A.H.-L.); (M.A.M.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain;
- Correspondence:
| | - Miguel A. Martín
- Hospital 12 de Octubre Research Institute (imas12), 28041 Madrid, Spain; (P.S.-L.); (A.B.-E.); (J.A.); (A.H.-L.); (M.A.M.)
- Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain;
- Mitochondrial Disorders Laboratory, Clinical Biochemistry Department, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
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Yao Z, Yuan Z, Bai Y, Gu H, Jia H, Liu D, Yang Z, Wang W. Altered mRNA and lncRNA expression profiles in the striated muscle complex of anorectal malformation rats. Pediatr Surg Int 2020; 36:1287-1297. [PMID: 32915273 DOI: 10.1007/s00383-020-04741-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/01/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Striated muscle complex (SMC) dysplasia has been confirmed to contribute to postoperative defecation dysfunction of patients with anorectal malformations (ARMs). To date, the potential molecular mechanisms of SMC dysplasia underlying the development of ARMs have not been clearly explained. This study examined the expression profiles of mRNAs and lncRNAs in the malformed SMC of ARM rats using RNA sequencing (RNA-seq). METHODS A rat model of ARMs was established by the intragastric administration of 1% ethylene thiourea (ETU) on an embryonic day 10 (E10). The rats were subjected to euthanasia and the SMC samples were collected on E19. The expression of mRNAs and lncRNAs was analyzed by RNA-seq on the Illumina HiSeq2500 platform. qRT-PCR was used to confirm the results of RNA-seq. RESULTS Compared with the levels in control rats, 1408 mRNAs and 472 lncRNAs were differentially expressed in the SMC of E19 ARM rats. GO and KEGG pathway analyses showed that the top enriched GO terms were mainly related to muscle development and the enriched pathways were associated with muscle and synaptic development. Protein-protein interaction network analysis was also performed using the STRING database. The network map revealed the interaction between the WNT3 protein and NTRK1, NTF4, MUSK, and BMP5 proteins. Finally, the qRT-PCR results further confirmed the RNA-seq data. CONCLUSION Our findings indicate the involvement of these dysregulated mRNAs and lncRNAs in the pathogenesis of SMC dysplasia in ARMs, providing a theoretical foundation for developing interventions to improve postoperative defecation function.
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Affiliation(s)
- Zhiya Yao
- Department of Pediatric Surgery, Shengjing Hospital, China Medical University, 36 Sanhao Street, Shenyang, Liaoning, 110004, People's Republic of China
| | - Zhengwei Yuan
- Key Laboratory of Health Ministry for Congenital Malformation, Shengjing Hospital, China Medical University, Shenyang, Liaoning, 110004, People's Republic of China
| | - Yuzuo Bai
- Department of Pediatric Surgery, Shengjing Hospital, China Medical University, 36 Sanhao Street, Shenyang, Liaoning, 110004, People's Republic of China
| | - Hui Gu
- Key Laboratory of Health Ministry for Congenital Malformation, Shengjing Hospital, China Medical University, Shenyang, Liaoning, 110004, People's Republic of China
| | - Huimin Jia
- Department of Pediatric Surgery, Shengjing Hospital, China Medical University, 36 Sanhao Street, Shenyang, Liaoning, 110004, People's Republic of China
| | - Dan Liu
- Key Laboratory of Health Ministry for Congenital Malformation, Shengjing Hospital, China Medical University, Shenyang, Liaoning, 110004, People's Republic of China
| | - Zhonghua Yang
- Department of Pediatric Surgery, Shengjing Hospital, China Medical University, 36 Sanhao Street, Shenyang, Liaoning, 110004, People's Republic of China
| | - Weilin Wang
- Department of Pediatric Surgery, Shengjing Hospital, China Medical University, 36 Sanhao Street, Shenyang, Liaoning, 110004, People's Republic of China.
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