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Chawla T, Nashi S, Baskar D, Polavarapu K, Vengalil S, Bardhan M, Preethish-Kumar V, Sukrutha R, Unnikrishnan G, Huddar A, Padmanabha H, Anjanappa RM, Bevinahalli N, Nittur V, Rajanna M, Arunachal Udupi G, Nalini A. Phenotype-genotype spectrum of a cohort of congenital muscular dystrophies: a single-centre experience from India. Neurogenetics 2024:10.1007/s10048-024-00776-6. [PMID: 39103709 DOI: 10.1007/s10048-024-00776-6] [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: 04/29/2024] [Accepted: 07/19/2024] [Indexed: 08/07/2024]
Abstract
Congenital Muscular Dystrophies (CMD) are phenotypically and genotypically heterogenous disorders with a prevalence of 0.68 to 2.5/100,000, contributing to significant morbidity and mortality. We aimed to study the phenotype-genotype spectrum of genetically confirmed cases of CMD. This was retrospective & descriptive study done at a quaternary care referral centre in south India. Genetically confirmed cases of CMDs seen between 2010 to 2020 were recruited. Detailed clinical history, including pedigree, MRI brain/muscle, next generation sequencing results of 61 CMD cases were collected. Collagen VI-related dystrophy (COL6-RD) (36%) was the most common subtype with variants frequently seen in COL6A1 gene. Other CMDs identified were LAMA2-RD (26%), alpha-dystroglycan-RD (19%), LMNA-RD (8%), CHKB-RD (7%) and SEPN1-RD (3%). Similar to previous cohorts, overall, missense variants were common in COL-6 RD. Variants in triple helical domain (THD) of COL6-RD were seen in 11/22 patients, 5 of whom were ambulatory contrary to previous literature citing severe disease with these variants. However, our follow-up period was shorter. In the LAMA2-RD, 2/16 patients were ambulatory & all 16 carried truncating variants. Among dystroglycanopathies, FKRP-RD was the commonest. Milder phenotype of FKRP- RD was observed with variant c.1343C > T, which was also a recurrent variant in our cohort. p.Arg249Trp variant in LMNA-CMD associated with early loss of ambulation was also identified in 1/5 of our patients who expired at age 2.8 years. The current retrospective series provides detailed clinical features and mutation patterns of genetically confirmed cases of CMD from a single center in India.
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Affiliation(s)
- Tanushree Chawla
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Saraswati Nashi
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Dipti Baskar
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Kiran Polavarapu
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - Seena Vengalil
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Mainak Bardhan
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Veeramani Preethish-Kumar
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Ramya Sukrutha
- Department of Human Genetics, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Gopikrishnan Unnikrishnan
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Akshata Huddar
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Hansashree Padmanabha
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Ram Murthy Anjanappa
- Department of Human Genetics, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Nandeesh Bevinahalli
- Department of Neuropathology, National Institute of Mental Health and Neurosciences, Bengaluru, 560029, India
| | - Vidya Nittur
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Manoj Rajanna
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Gautham Arunachal Udupi
- Department of Human Genetics, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India
| | - Atchayaram Nalini
- Department of Neurology, Neuroscience Faculty Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, 560029, India.
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Tan D, Ge L, Fan Y, Chang X, Wang S, Wei C, Ding J, Liu A, Wang S, Li X, Gao K, Yang H, Que C, Huang Z, Li C, Zhu Y, Mao B, Jin B, Hua Y, Zhang X, Zhang B, Zhu W, Zhang C, Wang Y, Yuan Y, Jiang Y, Rutkowski A, Bönnemann CG, Wu X, Xiong H. Natural history and genetic study of LAMA2-related muscular dystrophy in a large Chinese cohort. Orphanet J Rare Dis 2021; 16:319. [PMID: 34281576 PMCID: PMC8287797 DOI: 10.1186/s13023-021-01950-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 07/11/2021] [Indexed: 11/12/2022] Open
Abstract
Background LAMA2-related muscular dystrophy including LAMA2-related congenital muscular dystrophy (LAMA2-CMD) and autosomal recessive limb-girdle muscular dystrophy-23 (LGMDR23) is caused by LAMA2 pathogenic variants. We aimed to describe the natural history and establish genotype–phenotype correlations in a large cohort of Chinese patients with LAMA2-related muscular dystrophy. Methods Clinical and genetic data of LAMA2-related muscular dystrophy patients enrolled from ten research centers between January 2003 and March 2021 were collected and analyzed. Results One hundred and thirty patients (116 LAMA2-CMD and 14 LGMDR23) were included. LAMA2-CMD group had earlier onset than LGMDR23 group. Head control, independent sitting and ambulation were achieved in 76.3%, 92.6% and 18.4% of LAMA2-CMD patients at median ages of 6.0 months (range 2.0–36.0 months), 11.0 months (range 6.0–36.0 months), and 27.0 months (range 18.0–84.0 months), respectively. All LGMDR23 patients achieved independent ambulation at median age of 18.0 months (range 13.0–20.0 months). Motor regression in LAMA2-CMD mainly occurred concurrently with rapid progression of contractures during 6–9 years old. Twenty-four LAMA2-related muscular dystrophy patients died, mostly due to severe pneumonia. Seizures occurred in 35.7% of LGMDR23 and 9.5% of LAMA2-CMD patients. Forty-six novel and 97 known LAMA2 disease-causing variants were identified. The top three high-frequency disease-causing variants in Han Chinese patients were c.7147C > T (p.R2383*), exon 4 deletion, and c.5156_5159del (p.K1719Rfs*5). In LAMA2-CMD, splicing variants tended to be associated with a relatively mild phenotype. Nonsense variants were more frequent in LAMA2-CMD (56.9%, 66/116) than in LGMDR23 (21.4%, 3/14), while missense disease-causing variants were more frequent in LGMDR23 (71.4%, 10/14) than in LAMA2-CMD (12.9%, 15/116). Copy number variations were identified in 26.4% of survivors and 50.0% of nonsurvivors, suggesting that copy number variations were associated with lower rate of survival (p = 0.029). Conclusions This study provides better understandings of natural history and genotype–phenotype correlations in LAMA2-related muscular dystrophy, and supports therapeutic targets for future researches. Supplementary Information The online version contains supplementary material available at 10.1186/s13023-021-01950-x.
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Affiliation(s)
- Dandan Tan
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Lin Ge
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Yanbin Fan
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Xingzhi Chang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Shuang Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Cuijie Wei
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Juan Ding
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Aijie Liu
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Shuo Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Xueying Li
- Department of Statistics, Peking University First Hospital, Beijing, 100034, China
| | - Kai Gao
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Haipo Yang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Chengli Que
- Department of Respiratory and Critical Care Medicine, Peking University First Hospital, Beijing, 100034, China
| | - Zhen Huang
- Department of Rehabilitation Medicine, Peking University First Hospital, Beijing, 100034, China
| | - Chunde Li
- Department of Orthopedic/Spine Surgery, Peking University First Hospital, Beijing, 100034, China
| | - Ying Zhu
- Department of Radiology, Peking University First Hospital, Beijing, 100034, China
| | - Bing Mao
- Department of Neurology, Wuhan Children's Hospital, Wuhan, 430015, Hubei Province, China
| | - Bo Jin
- Department of Neurology, Children's Hospital of Nanjing Medical University, Nanjing, 210008, Jiangsu Province, China
| | - Ying Hua
- Department of Pediatrics, Wuxi Children's Hospital, Wuxi, 214000, Jiangsu Province, China
| | - Xiaoli Zhang
- Department of Pediatrics, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan Province, China
| | - Bingbing Zhang
- Department of Neurology, Children's Hospital of Soochow University, Suzhou, 215025, Jiangsu Province, China
| | - Wenhua Zhu
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai, 200040, China
| | - Cheng Zhang
- Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510080, Guangdong Province, China
| | - Yanjuan Wang
- Department of Neurology, School of Medicine, Chengdu Women's & Children's Central Hospital, University of Electronic Science and Technology of China, Chengdu, 610091, Sichuan Province, China
| | - Yun Yuan
- Department of Neurology, Peking University First Hospital, Beijing, 100034, China
| | - Yuwu Jiang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | | | - Carsten G Bönnemann
- Neuromuscular and Neurogenetic Disorders of Childhood Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Xiru Wu
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Hui Xiong
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China.
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Khodaenia N, Farjami Z, Ashnaei AH, Ebrahimi N, Chelvarforoosh N, Urtizberea A, Razmara E, Houshmand M. Novel Homozygous Pathogenic Mutations of LAMA 2 Gene in Patients with Congen ital Muscular Dystrophy. IRANIAN JOURNAL OF CHILD NEUROLOGY 2021; 15:101-106. [PMID: 33558818 PMCID: PMC7856435 DOI: 10.22037/ijcn.v15i1.21649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 01/01/2020] [Indexed: 11/18/2022]
Abstract
The laminin α2 subunit is a protein encoded by the laminin α2 gene(LAMA2) which has the role of adhesion (attachment of cells to one another). Genetics consideration showed that mutation in LAMA2 caused a collection of muscle-wasting conditions called muscular dystrophy. This disorder causes disconnection of muscular cells and degeneration of the musculoskeletal system. In this study, we defined the molecular consideration of three patients with laminin α2 deficiency by clinical presentations of congenital muscular dystrophy. In this regard, 65 exons of the LAMA2 gene were amplified by polymerase chain reaction. Moreover, multiple ligation-dependent probe amplification and next generation sequencing (NGS) were carried out for all the patients. Because of NGS negativity, gene sequencing was performed. Results of searching for rearrangements of the LAMA2 gene enabled us to recognize homozygous pathogenic mutations c.2049_c.2050del, c.7156-2A>G, and c,1303C>T. These mutations produce an out-of-frame transcript that will be degraded by nonsense mediated decay. Therefore, we think these changes are pathogenic ones.
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Affiliation(s)
- Negar Khodaenia
- National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Zahra Farjami
- National Institute of Genetic Engineering and Biotechnology, Tehran, Iran.,Department of Modern Sciences& Technologies, Medicine Faculty, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Hosein Ashnaei
- Department of Modern Sciences& Technologies, Medicine Faculty, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Neshat Ebrahimi
- Laboratory of Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Navid Chelvarforoosh
- Department of Agricultural Biotechnology, Science Faculty, Ferdowsi University of Mashhad, Mashhad, Iran
| | | | - Ehsan Razmara
- Department of Molecular Genetics, Faculty of Biological Science, Tarbiat Modares, Tehran, Iran
| | - Massoud Houshmand
- National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
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Arreguin AJ, Colognato H. Brain Dysfunction in LAMA2-Related Congenital Muscular Dystrophy: Lessons From Human Case Reports and Mouse Models. Front Mol Neurosci 2020; 13:118. [PMID: 32792907 PMCID: PMC7390928 DOI: 10.3389/fnmol.2020.00118] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 06/09/2020] [Indexed: 12/26/2022] Open
Abstract
Laminin α2 gene (LAMA2)-related Congenital Muscular Dystrophy (CMD) was distinguished by a defining central nervous system (CNS) abnormality—aberrant white matter signals by MRI—when first described in the 1990s. In the past 25 years, researchers and clinicians have expanded our knowledge of brain involvement in LAMA2-related CMD, also known as Congenital Muscular Dystrophy Type 1A (MDC1A). Neurological changes in MDC1A can be structural, including lissencephaly and agyria, as well as functional, including epilepsy and intellectual disability. Mouse models of MDC1A include both spontaneous and targeted LAMA2 mutations and range from a partial loss of LAMA2 function (e.g., dy2J/dy2J), to a complete loss of LAMA2 expression (dy3K/dy3K). Diverse cellular and molecular changes have been reported in the brains of MDC1A mouse models, including blood-brain barrier dysfunction, altered neuro- and gliogenesis, changes in synaptic plasticity, and decreased myelination, providing mechanistic insight into potential neurological dysfunction in MDC1A. In this review article, we discuss selected studies that illustrate the potential scope and complexity of disturbances in brain development in MDC1A, and as well as highlight mechanistic insights that are emerging from mouse models.
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Affiliation(s)
- Andrea J Arreguin
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, United States.,Medical Scientist Training Program (MSTP), Stony Brook University, Stony Brook, NY, United States
| | - Holly Colognato
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, United States
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5
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Clinical and genomic characteristics of LAMA2 related congenital muscular dystrophy in a patients' cohort from Qatar. A population specific founder variant. Neuromuscul Disord 2020; 30:457-471. [PMID: 32444167 DOI: 10.1016/j.nmd.2020.03.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 12/22/2022]
Abstract
Congenital LAMA2 related muscular dystrophy (LAMA2-RD), the most commonly recognized type of congenital muscular dystrophies, has been described in patients' cohorts from Europe and the UK but not from Middle-Eastern. This study aimed to reveal the prevalence, clinical and genomic characteristics of congenital LAMA2-RD in a patient's cohort of 17 families (21 patients) from the Gulf and Middle East. Affected subjects exhibited the classic phenotype of generalized hypotonia, developmental delay, and progressive muscular weakness. Despite the homogeneous background of most of our patients, clinical variability was evident; however, none of our patients was able to achieve independent ambulation. The associated features of nephrocalcinosis, infantile-onset osteopenia, and cardiac arrest were first described in this study. LAMA2 mutations constituted 48% of the genetic causes underlying congenital muscular dystrophies (CMDs) in our patients. We estimated a point prevalence of 0.8 in 100.000 for LAMA2-RD in Qatar, relatively higher compared to that described in Europe's studies. The founder mutation and high rate of consanguinity are potential contributors. This study identified five LAMA2 truncating variants, two novel and three recurrent, of which the c.6488delA-frameshift that was found in 12 unrelated Qatari families, highlighting a founder mutation in Qatari patients. The two novel variants involved an acceptor splice site and N-terminus deletion that removes the LAMA2 promoter, exon1, and part of intron1. The "residual" expression of LAMA2 transcript and protein associated with this large N-terminus deletion suggested an alternative promoter that, while seems to be activated, acts less efficiently.
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Natera-de Benito D, Muchart J, Itzep D, Ortez C, González-Quereda L, Gallano P, Ramirez A, Aparicio J, Domínguez-Carral J, Carrera-García L, Expósito-Escudero J, Pardo Cardozo N, Cuadras D, Codina A, Jou C, Jimenez-Mallebrera C, Palau F, Colomer J, Arzimanoglou A, Nascimento A, San Antonio-Arce V. Epilepsy in LAMA2-related muscular dystrophy: An electro-clinico-radiological characterization. Epilepsia 2020; 61:971-983. [PMID: 32266982 DOI: 10.1111/epi.16493] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 03/02/2020] [Accepted: 03/09/2020] [Indexed: 01/20/2023]
Abstract
OBJECTIVE To delineate the epileptic phenotype of LAMA2-related muscular dystrophy (MD) and correlate it with the neuroradiological and muscle biopsy findings, as well as the functional motor phenotype. METHODS Clinical, electrophysiological, neuroradiological, and histopathological data of 25 patients with diagnosis of LAMA2-related MD were analyzed. RESULTS Epilepsy occurred in 36% of patients with LAMA2-related MD. Mean age at first seizure was 8 years. The most common presenting seizure type was focal-onset seizures with or without impaired awareness. Visual aura and autonomic signs, including vomiting, were frequently reported. Despite a certain degree of variability, bilateral occipital or temporo-occipital epileptiform abnormalities were by far the most commonly observed. Refractory epilepsy was found in 75% of these patients. Epilepsy in LAMA2-related MD was significantly more prevalent in those patients in whom the cortical malformations were more extensive. In contrast, the occurrence of epilepsy was not found to be associated with the patients' motor ability, the size of their white matter abnormalities, or the amount of residual merosin expressed on muscle. SIGNIFICANCE The epileptic phenotype of LAMA2-related MD is characterized by focal seizures with prominent visual and autonomic features associated with EEG abnormalities that predominate in the posterior quadrants. A consistent correlation between epileptic phenotype and neuroimaging was identified, suggesting that the extension of the polymicrogyria may serve as a predictor of epilepsy occurrence.
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Affiliation(s)
- Daniel Natera-de Benito
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Jordi Muchart
- Department of Radiology, Hospital Sant Joan de Déu, Barcelona, Spain
| | - Debora Itzep
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Carlos Ortez
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Lidia González-Quereda
- Department of Genetics, Hospital de la Santa Creu i Sant Pau and CIBERER U705, Barcelona, Spain
| | - Pía Gallano
- Department of Genetics, Hospital de la Santa Creu i Sant Pau and CIBERER U705, Barcelona, Spain
| | - Alia Ramirez
- Unit of Epilepsy, Sleep and Neurophysiology, Neuropaediatrics Department, Hospital Sant Joan de Déu, Barcelona, Spain
| | - Javier Aparicio
- Unit of Epilepsy, Sleep and Neurophysiology, Neuropaediatrics Department, Hospital Sant Joan de Déu, Barcelona, Spain
| | - Jana Domínguez-Carral
- Unit of Epilepsy, Sleep and Neurophysiology, Neuropaediatrics Department, Hospital Sant Joan de Déu, Barcelona, Spain
| | - Laura Carrera-García
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Jessica Expósito-Escudero
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Nathalia Pardo Cardozo
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Daniel Cuadras
- Statistics Department, Fundació Sant Joan de Déu, Barcelona, Spain
| | - Anna Codina
- Department of Pathology, Hospital Sant Joan de Déu, Barcelona, Spain
| | - Cristina Jou
- Department of Pathology, Hospital Sant Joan de Déu, Barcelona, Spain
| | - Cecilia Jimenez-Mallebrera
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Francesc Palau
- Department of Genetic and Molecular Medicine, Hospital Sant Joan de Déu, Barcelona, Spain.,Laboratory of Neurogenetics and Molecular Medicine, Institut de Recerca Sant Joan de Déu, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Barcelona, Spain.,Institute of Medicine and Dermatology, Hospital Clínic and Division of Pediatrics, University of Barcelona School of Medicine and Health Sciences, Barcelona, Spain
| | - Jaume Colomer
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Alexis Arzimanoglou
- Unit of Epilepsy, Sleep and Neurophysiology, Neuropaediatrics Department, Hospital Sant Joan de Déu, Barcelona, Spain.,Epileptology, Sleep Disorders and Functional Pediatric Neurology, Member of ERN-EpiCARE; HFME, Hospices Civils de Lyon, Bron, France
| | - Andrés Nascimento
- Neuromuscular Unit, Neuropaediatrics Department, Institut de Recerca Hospital Sant Joan de Déu and CIBERER U703, Barcelona, Spain
| | - Victoria San Antonio-Arce
- Unit of Epilepsy, Sleep and Neurophysiology, Neuropaediatrics Department, Hospital Sant Joan de Déu, Barcelona, Spain
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Nguyen Q, Lim KRQ, Yokota T. Current understanding and treatment of cardiac and skeletal muscle pathology in laminin-α2 chain-deficient congenital muscular dystrophy. APPLICATION OF CLINICAL GENETICS 2019; 12:113-130. [PMID: 31308722 PMCID: PMC6618038 DOI: 10.2147/tacg.s187481] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 05/08/2019] [Indexed: 01/04/2023]
Abstract
Congenital muscular dystrophy (CMD) is a class of severe early-onset muscular dystrophies affecting skeletal/cardiac muscles as well as the central nervous system (CNS). Laminin-α2 chain-deficient congenital muscular dystrophy (LAMA2 MD), also known as merosin-deficient congenital muscular dystrophy type 1A (MDC1A), is an autosomal recessive CMD characterized by severe muscle weakness and degeneration apparent at birth or in the first 6 months of life. LAMA2 MD is the most common congenital muscular dystrophy, affecting approximately 4 in 500,000 children. The most common cause of death in early-onset LAMA2 MD is respiratory tract infection, with 30% of them dying within the first decade of life. LAMA2 MD is caused by loss-of-function mutations in the LAMA2 gene encoding for the laminin-α2 chain, one of the subunits of laminin-211. Laminin-211 is an extracellular matrix protein that functions to stabilize the basement membrane and muscle fibers during contraction. Since laminin-α2 is expressed in many tissue types including skeletal muscle, cardiac muscle, Schwann cells, and trophoblasts, patients with LAMA2 MD experience a multi-systemic clinical presentation depending on the extent of laminin-α2 chain deficiency. Cardiac manifestations are typically associated with a complete absence of laminin-α2; however, recent case reports highlight cardiac involvement in partial laminin-α2 chain deficiency. Laminin-211 is also expressed in the brain, and many patients have abnormalities on brain imaging; however, mental retardation and/or seizures are rarely seen. Currently, there is no cure for LAMA2 MD, but various therapies are being investigated in an effort to lessen the severity of LAMA2 MD. For example, antisense oligonucleotide-mediated exon skipping and CRISPR-Cas9 genome editing have efficiently restored the laminin-α2 chain in mouse models in vivo. This review consolidates information on the clinical presentation, genetic basis, pathology, and current treatment approaches for LAMA2 MD.
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Affiliation(s)
- Quynh Nguyen
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Kenji Rowel Q Lim
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Toshifumi Yokota
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.,The Friends of Garrett Cumming Research & Muscular Dystrophy Canada, HM Toupin Neurological Science Research Chair, Edmonton, AB, Canada
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8
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Min R, van der Knaap MS. Genetic defects disrupting glial ion and water homeostasis in the brain. Brain Pathol 2019; 28:372-387. [PMID: 29740942 PMCID: PMC8028498 DOI: 10.1111/bpa.12602] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 03/02/2018] [Indexed: 12/23/2022] Open
Abstract
Electrical activity of neurons in the brain, caused by the movement of ions between intracellular and extracellular compartments, is the basis of all our thoughts and actions. Maintaining the correct ionic concentration gradients is therefore crucial for brain functioning. Ion fluxes are accompanied by the displacement of osmotically obliged water. Since even minor brain swelling leads to severe brain damage and even death, brain ion and water movement has to be tightly regulated. Glial cells, in particular astrocytes, play a key role in ion and water homeostasis. They are endowed with specific channels, pumps and carriers to regulate ion and water flow. Glial cells form a large panglial syncytium to aid the uptake and dispersal of ions and water, and make extensive contacts with brain fluid barriers for disposal of excess ions and water. Genetic defects in glial proteins involved in ion and water homeostasis disrupt brain functioning, thereby leading to neurological diseases. Since white matter edema is often a hallmark disease feature, many of these diseases are characterized as leukodystrophies. In this review we summarize our current understanding of inherited glial diseases characterized by disturbed brain ion and water homeostasis by integrating findings from MRI, genetics, neuropathology and animal models for disease. We discuss how mutations in different glial proteins lead to disease, and highlight the similarities and differences between these diseases. To come to effective therapies for this group of diseases, a better mechanistic understanding of how glial cells shape ion and water movement in the brain is crucial.
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Affiliation(s)
- Rogier Min
- Department of Child Neurology, Amsterdam Neuroscience, VU University Medical Center, Amsterdam, The Netherlands.,Department of Integrative Neurophysiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, The Netherlands
| | - Marjo S van der Knaap
- Department of Child Neurology, Amsterdam Neuroscience, VU University Medical Center, Amsterdam, The Netherlands.,Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, The Netherlands
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9
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Oliveira J, Gruber A, Cardoso M, Taipa R, Fineza I, Gonçalves A, Laner A, Winder TL, Schroeder J, Rath J, Oliveira ME, Vieira E, Sousa AP, Vieira JP, Lourenço T, Almendra L, Negrão L, Santos M, Melo-Pires M, Coelho T, den Dunnen JT, Santos R, Sousa M. LAMA2 gene mutation update: Toward a more comprehensive picture of the laminin-α2 variome and its related phenotypes. Hum Mutat 2018; 39:1314-1337. [PMID: 30055037 DOI: 10.1002/humu.23599] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 07/05/2018] [Accepted: 07/25/2018] [Indexed: 12/15/2022]
Abstract
Congenital muscular dystrophy type 1A (MDC1A) is one of the main subtypes of early-onset muscle disease, caused by disease-associated variants in the laminin-α2 (LAMA2) gene. MDC1A usually presents as a severe neonatal hypotonia and failure to thrive. Muscle weakness compromises normal motor development, leading to the inability to sit unsupported or to walk independently. The phenotype associated with LAMA2 defects has been expanded to include milder and atypical cases, being now collectively known as LAMA2-related muscular dystrophies (LAMA2-MD). Through an international multicenter collaborative effort, 61 new LAMA2 disease-associated variants were identified in 86 patients, representing the largest number of patients and new disease-causing variants in a single report. The collaborative variant collection was supported by the LOVD-powered LAMA2 gene variant database (https://www.LOVD.nl/LAMA2), updated as part of this work. As of December 2017, the database contains 486 unique LAMA2 variants (309 disease-associated), obtained from direct submissions and literature reports. Database content was systematically reviewed and further insights concerning LAMA2-MD are presented. We focus on the impact of missense changes, especially the c.2461A > C (p.Thr821Pro) variant and its association with late-onset LAMA2-MD. Finally, we report diagnostically challenging cases, highlighting the relevance of modern genetic analysis in the characterization of clinically heterogeneous muscle diseases.
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Affiliation(s)
- Jorge Oliveira
- Unidade de Genética Molecular, Centro de Genética Médica Dr. Jacinto Magalhães, Centro Hospitalar do Porto, Porto, Portugal.,Unidade Multidisciplinar de Investigação Biomédica (UMIB), Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
| | | | - Márcio Cardoso
- Consulta de Doenças Neuromusculares e Serviço de Neurofisiologia, Departamento de Neurociências, Centro Hospitalar do Porto, Porto, Portugal
| | - Ricardo Taipa
- Unidade de Neuropatologia, Centro Hospitalar do Porto, Porto, Portugal
| | - Isabel Fineza
- Unidade de Neuropediatria, Centro de Desenvolvimento da Criança Luís Borges, Hospital Pediátrico de Coimbra, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal
| | - Ana Gonçalves
- Unidade de Genética Molecular, Centro de Genética Médica Dr. Jacinto Magalhães, Centro Hospitalar do Porto, Porto, Portugal.,Unidade Multidisciplinar de Investigação Biomédica (UMIB), Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
| | | | | | | | - Julie Rath
- PreventionGenetics, Marshfield, Wisconsin
| | - Márcia E Oliveira
- Unidade de Genética Molecular, Centro de Genética Médica Dr. Jacinto Magalhães, Centro Hospitalar do Porto, Porto, Portugal.,Unidade Multidisciplinar de Investigação Biomédica (UMIB), Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
| | - Emília Vieira
- Unidade de Genética Molecular, Centro de Genética Médica Dr. Jacinto Magalhães, Centro Hospitalar do Porto, Porto, Portugal.,Unidade Multidisciplinar de Investigação Biomédica (UMIB), Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
| | - Ana Paula Sousa
- Consulta de Doenças Neuromusculares e Serviço de Neurofisiologia, Departamento de Neurociências, Centro Hospitalar do Porto, Porto, Portugal
| | - José Pedro Vieira
- Serviço de Neurologia, Hospital de Dona Estefânia, Centro Hospitalar de Lisboa Central, Lisboa, Portugal
| | - Teresa Lourenço
- Serviço de Genética Médica, Hospital de Dona Estefânia, Centro Hospitalar de Lisboa Central, Lisboa, Portugal
| | - Luciano Almendra
- Consulta de Doenças Neuromusculares, Hospitais da Universidade de Coimbra, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal
| | - Luís Negrão
- Consulta de Doenças Neuromusculares, Hospitais da Universidade de Coimbra, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal
| | - Manuela Santos
- Consulta de Doenças Neuromusculares e Serviço de Neuropediatria, Centro Hospitalar do Porto, Porto, Portugal
| | - Manuel Melo-Pires
- Unidade de Neuropatologia, Centro Hospitalar do Porto, Porto, Portugal
| | - Teresa Coelho
- Consulta de Doenças Neuromusculares e Serviço de Neurofisiologia, Departamento de Neurociências, Centro Hospitalar do Porto, Porto, Portugal
| | - Johan T den Dunnen
- Departments of Human Genetics and Clinical Genetics, Leiden University Medical Center, Leiden, the Netherlands
| | - Rosário Santos
- Unidade de Genética Molecular, Centro de Genética Médica Dr. Jacinto Magalhães, Centro Hospitalar do Porto, Porto, Portugal.,Unidade Multidisciplinar de Investigação Biomédica (UMIB), Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal.,UCIBIO/REQUIMTE, Departamento de Ciências Biológicas, Laboratório de Bioquímica, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Mário Sousa
- Unidade Multidisciplinar de Investigação Biomédica (UMIB), Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal.,Departamento de Microscopia, Laboratório de Biologia Celular, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal.,Centro de Genética da Reprodução Prof. Alberto Barros, Porto, Portugal
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10
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Nelson I, Stojkovic T, Allamand V, Leturcq F, Bécane HM, Babuty D, Toutain A, Béroud C, Richard P, Romero NB, Eymard B, Ben Yaou R, Bonne G. Laminin α2 Deficiency-Related Muscular Dystrophy Mimicking Emery-Dreifuss and Collagen VI related Diseases. J Neuromuscul Dis 2015; 2:229-240. [PMID: 27858741 PMCID: PMC5240538 DOI: 10.3233/jnd-150093] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Background: Laminin α2 deficient congenital muscular dystrophy, caused by mutations in the LAMA2 gene, is characterized by early muscle weakness associated with abnormal white matter signal on cerebral MRI. Objective: To report on 4 patients with LAMA2 gene mutations whose original clinical features complicated the diagnosis strategy. Methods: Clinical, electrophysiological, muscle imaging and histopathological data were retrospectively collected from all patients. DNA samples were analysed by next-generation sequencing or direct gene sequencing. Laminin α2 was analysed by western-blot and immunohistochemistry. Results: The four patients achieved independent walking. All had proximal muscle weakness with scapular winging and prominent joint contractures without peripheral neuropathy. During follow-up, two patients suffered from refractory epilepsy associated with brain leukoencephalopathy in one, polymicrogyria and lissencephaly without white matter changes in the other. In two patients, the distribution of fatty infiltration resembles that of collagen-VI related myopathies. Dilated cardiomyopathy contstartabstractwith conduction defects, suggestive of Emery-Dreifuss myopathy, emerged in two of them within the 4th decade. Molecular diagnosis remained elusive for many years. Finally, targeted capture-DNA sequencing unveiled the involvement of the LAMA2 gene in two families, and led us to further identify LAMA2 mutations in the remaining family using Sanger sequencing. Conclusions: This report extends the clinical and radiological features of partial Laminin α2 deficiency since patients showed atypical manifestations including dilated cardiomyopathy with conduction defects in 2, epilepsy in 2, one of whom also had sole cortical brain abnormalities. Importantly, clinical findings and muscle imaging initially pointed to collagen-VI related disorders and Emery-Dreifuss muscular dystrophy.
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Affiliation(s)
- Isabelle Nelson
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Tanya Stojkovic
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Valérie Allamand
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - France Leturcq
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,AP-HP, Groupe Hospitalier Cochin-Broca-Hôtel Dieu, Laboratoire de biochimie et génétique moléculaire, Paris, France
| | - Henri-Marc Bécane
- Institut de Myologie, F-75013, Paris, France.,AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Centre de référence des maladies neuromusculaires Paris Est, F-75013, Paris, France
| | - Dominique Babuty
- Service de Cardiologie, Hôpital Trousseau, CHU Tours, Tours, France
| | - Annick Toutain
- Service de Génétique, Hôpital Bretonneau, CHU Tours, Tours, France
| | - Christophe Béroud
- INSERM UMR S910, AP-HM, service de génétique médicale, Aix Marseille Université, Marseille, France
| | - Pascale Richard
- AP-HP, Groupe Hospitalier La Pitié-Salpôtrière, U.F. Cardiogénétique et Myogénétique, Service de Biochimie Métabolique, F-75013, Paris, France
| | - Norma B Romero
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,Institut de Myologie, F-75013, Paris, France.,AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Centre de référence des maladies neuromusculaires Paris Est, F-75013, Paris, France.,Unité de morphologieneuromusculaire, Institut de Myologie, Groupe Hospitalier Universitaire La Pitié-Salpêtrière, F-75013, Paris, France
| | - Bruno Eymard
- Institut de Myologie, F-75013, Paris, France.,AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Centre de référence des maladies neuromusculaires Paris Est, F-75013, Paris, France
| | - Rabah Ben Yaou
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,Institut de Myologie, F-75013, Paris, France.,AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Centre de référence des maladies neuromusculaires Paris Est, F-75013, Paris, France
| | - Gisèle Bonne
- Sorbonne Universités,UPMCUniv Paris 06, INSERM UMRS974, CNRS FRE3617, Center of Research in Myology, F-75013 Paris, France.,Institut de Myologie, F-75013, Paris, France
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11
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Camacho A, Núñez N, Dekomien G, Hernández-Laín A, de Aragón AM, Simón R. LAMA2-related congenital muscular dystrophy complicated by West syndrome. Eur J Paediatr Neurol 2015; 19:243-7. [PMID: 25500573 DOI: 10.1016/j.ejpn.2014.11.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 11/17/2014] [Accepted: 11/23/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND Mutations in the LAMA2 gene cause autosomal recessive laminin α2 related congenital muscular dystrophy. In patients with partial laminin α2 deficiency the phenotype is usually milder than in those with absent protein. Apart from the typical white matter abnormalities, there is an increased risk of cerebral complications such as epilepsy and mental retardation, despite a structurally normal brain. METHODS/RESULTS We present a patient with primary partial laminin α2 deficiency due to a homozygous novel LAMA2 missense mutation who developed West syndrome in his first year of life. To our knowledge, this combination has not previously been reported. A 5 year-old boy exhibited global hypotonia with generalized muscle weakness from birth. At 8 months of age he presented infantile spasms and an EEG finding of hypsarrhythmia. Seizures were controlled in a few weeks with intramuscular synthetic ACTH, followed by valproic acid. Two years later antiepileptic medication was withdrawn. He achieved unsupported walking at the age of 4, but his cognitive status corresponded to a 2 year-old child. Epilepsy has not recurred and brain MRI showed the typical white matter abnormalities without associated neuronal migration defects. CONCLUSION This report widens the clinical spectrum of cerebral manifestations related with mutations in LAMA2. The beginning of a severe epileptic encephalopathy modifies the natural history of the disease.
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Affiliation(s)
- Ana Camacho
- Child Neurology Unit, Hospital Universitario 12 de Octubre, Madrid, Spain.
| | - Noemí Núñez
- Child Neurology Unit, Hospital Universitario 12 de Octubre, Madrid, Spain
| | | | | | | | - Rogelio Simón
- Child Neurology Unit, Hospital Universitario 12 de Octubre, Madrid, Spain
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12
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Sleep-disordered breathing in children with congenital muscular dystrophies. Eur J Paediatr Neurol 2012; 16:619-24. [PMID: 22425345 DOI: 10.1016/j.ejpn.2012.02.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 01/31/2012] [Accepted: 02/22/2012] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Most types of neuromuscular diseases are known to be associated with a high risk of sleep-disordered breathing. We performed a prospective study in a well individualized group of muscular disorders, congenital muscular dystrophies (CMD), to characterize the frequency of sleep-disordered breathing and thereby to determine the potential usefulness of sleep studies in such patients. METHODS Twenty CMD children (12 F, 8 M, aged 4-17 years) were included. Using overnight polysomnography, we determined the following parameters: sleep stages, sleep latency, sleep efficiency index, wake time duration, total sleep time (TST), apnea/hypopnea index (AHI), arterial blood oxygen saturation, and nocturnal paroxysmal EEG activity. RESULTS As compared to healthy controls, we detected in our study group frequent awakenings, a decreased TST (mean 448 ± 44.4 min) and a decreased REM duration (mean 11.5 ± 3.5% of TST). Significant increase in wake time duration (28-90 min) and decrease in REM duration were observed in 12 patients. An apnea/hypopnea syndrome was detected in 13 patients (65%) with central apneas in 8, obstructive apneas in 2 and 3 mixed apneas in 3 patients. AHI was >10 in 3 cases, <10> 5 in 4 cases and were concomitant with blood oxygen de-saturation in four cases. NPA were detected in 10 patients ranging from 10 to 40% of TST. INTERPRETATION Our results confirm the high incidence of sleep disordered breathing in children with CMD, and thereby, the usefulness of overnight polysomnography recordings in such patients.
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13
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CNS findings in congenital muscular dystrophy 1A (with laminin alpha-2-deficiency). Transl Neurosci 2011. [DOI: 10.2478/s13380-011-0020-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractCongenital muscular dystrophy (MDC) is a group of rare hereditary myopathies with an early onset of progressive muscle weakness and dystrophic changes as evidenced by muscle biopsy. Some forms are associated with severe malformations of the brain. This study presented 2 pediatric patients with genetically diagnosed congenital muscular dystrophy 1A. The patients exhibited a typical combination of muscular hypotonia, joint contractures and elevated creatine kinase levels. Characteristic white matter lesions were not present in an early MRI scan of one patient, but could be detected at the age of 18 months. The second patient showed both severe white and grey matter abnormalities (pachy microgyria) in the MRI scan. In both cases, MRI findings did not correlate with the mental development of the patients.
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14
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Wang CH, Bonnemann CG, Rutkowski A, Sejersen T, Bellini J, Battista V, Florence JM, Schara U, Schuler PM, Wahbi K, Aloysius A, Bash RO, Béroud C, Bertini E, Bushby K, Cohn RD, Connolly AM, Deconinck N, Desguerre I, Eagle M, Estournet-Mathiaud B, Ferreiro A, Fujak A, Goemans N, Iannaccone ST, Jouinot P, Main M, Melacini P, Mueller-Felber W, Muntoni F, Nelson LL, Rahbek J, Quijano-Roy S, Sewry C, Storhaug K, Simonds A, Tseng B, Vajsar J, Vianello A, Zeller R. Consensus statement on standard of care for congenital muscular dystrophies. J Child Neurol 2010; 25:1559-81. [PMID: 21078917 PMCID: PMC5207780 DOI: 10.1177/0883073810381924] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Congenital muscular dystrophies are a group of rare neuromuscular disorders with a wide spectrum of clinical phenotypes. Recent advances in understanding the molecular pathogenesis of congenital muscular dystrophy have enabled better diagnosis. However, medical care for patients with congenital muscular dystrophy remains very diverse. Advances in many areas of medical technology have not been adopted in clinical practice. The International Standard of Care Committee for Congenital Muscular Dystrophy was established to identify current care issues, review literature for evidence-based practice, and achieve consensus on care recommendations in 7 areas: diagnosis, neurology, pulmonology, orthopedics/rehabilitation, gastroenterology/ nutrition/speech/oral care, cardiology, and palliative care. To achieve consensus on the care recommendations, 2 separate online surveys were conducted to poll opinions from experts in the field and from congenital muscular dystrophy families. The final consensus was achieved in a 3-day workshop conducted in Brussels, Belgium, in November 2009. This consensus statement describes the care recommendations from this committee.
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Affiliation(s)
- Ching H. Wang
- Stanford University School of Medicine, Stanford, California
| | | | | | | | | | | | | | | | | | | | | | - Robert O. Bash
- University of Texas Southwestern Medical Center, Dallas, Texas
| | - Christophe Béroud
- INSERM U827, Laboratoire de Génétique Moleculaire, Montpellier, France
| | | | - Kate Bushby
- Institute of Human Genetics, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ronald D. Cohn
- John Hopkins University School of Medicine, Baltimore, Maryland
| | | | | | | | - Michelle Eagle
- Institute of Human Genetics, Newcastle University, Newcastle upon Tyne, United Kingdom
| | | | - Ana Ferreiro
- UMR 787 Groupe Myologie, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Albert Fujak
- Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | | | | | | | | | | | | | | | | | - Jes Rahbek
- Rehabiliterings Center for Muskelsvind, Aarhus, Denmark
| | | | | | - Kari Storhaug
- National Resource Centre for Oral Health in Rare Medical Conditions, Oslo, Norway
| | | | - Brian Tseng
- Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Jiri Vajsar
- The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | | | - Reinhard Zeller
- The Hospital for Sick Children, University of Toronto, Toronto, Canada
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15
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Geranmayeh F, Clement E, Feng LH, Sewry C, Pagan J, Mein R, Abbs S, Brueton L, Childs AM, Jungbluth H, De Goede CG, Lynch B, Lin JP, Chow G, Sousa CD, O'Mahony O, Majumdar A, Straub V, Bushby K, Muntoni F. Genotype-phenotype correlation in a large population of muscular dystrophy patients with LAMA2 mutations. Neuromuscul Disord 2010; 20:241-50. [PMID: 20207543 DOI: 10.1016/j.nmd.2010.02.001] [Citation(s) in RCA: 132] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Revised: 01/09/2010] [Accepted: 02/01/2010] [Indexed: 11/25/2022]
Abstract
Merosin deficient congenital muscular dystrophy 1A (MDC1A) results from mutations in the LAMA2 gene. We report 51 patients with MDC1A and examine the relationship between degree of merosin expression, genotype and clinical features. Thirty-three patients had absence of merosin and 13 showed some residual merosin. Compared to the residual merosin group, patients with absent merosin had an earlier presentation (<7days) (P=0.0073), were more likely to lack independent ambulation (P=0.0215), or require enteral feeding (P=0.0099) and ventilatory support (P=0.0354). We identified 33 novel LAMA2 mutations; these were distributed throughout the gene in patients with absent merosin, with minor clusters in exon 27, 14, 25 and 26 (55% of mutations). Patients with residual merosin often carried at least one splice site mutation and less frequently frameshift mutations. This large study identified novel LAMA2 mutations and highlights the role of immunohistochemical studies for merosin status in predicting clinical severity of MDC1A.
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Affiliation(s)
- Fatemeh Geranmayeh
- Dubowitz Neuromuscular Centre, Institute of Child Health & Great Ormond Street Hospital, 30 Guilford Street, London WC1N 1EH, United Kingdom
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16
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Abstract
Muscular dystrophies are inherited muscle disorders associated with different gene mutations. Fukuyama congenital muscular dystrophy is associated with cobblestone lissencephaly and epilepsy frequently. Rarely, other types of muscular dystrophies are also associated with epilepsy including Duchenne and Becker muscular dystrophy, facioscapulohumeral dystrophy, congenital muscular dystrophy with partial and complete deficiency of laminin alpha2 chain, and limb-girdle muscular dystrophy 2A with calpain deficiency. We now report another rare case of partial epilepsy and limb-girdle muscular dystrophy type 1B with lamin A/C gene mutation.
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Affiliation(s)
- Chang-Yong Tsao
- Departments of Pediatric and Neurology, The Ohio State University, Columbus, Ohio, USA.
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17
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Vigliano P, Dassi P, Di Blasi C, Mora M, Jarre L. LAMA2 stop-codon mutation: merosin-deficient congenital muscular dystrophy with occipital polymicrogyria, epilepsy and psychomotor regression. Eur J Paediatr Neurol 2009; 13:72-6. [PMID: 18406646 DOI: 10.1016/j.ejpn.2008.01.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Revised: 01/23/2008] [Accepted: 01/29/2008] [Indexed: 11/28/2022]
Abstract
Merosin-deficient congenital muscular dystrophy (MD) type 1A (MDC1A) is one of the most frequent forms of CMD in Western countries. The classical form, characterized by a total lack of laminin alpha2 chain expression, usually shows severe clinical features; cases with complete laminin alpha2 deficiency and mild phenotype have also been reported, although the mechanisms underlying the lack of genotype-phenotype correlation have not been elucidated. Epilepsy and focal cortical dysplasia-in addition to the classical diffuse white matter abnormalities-have been described in some of these patients associated with cognitive deterioration. We report on a patient with total laminin alpha2 deficiency due to a homozygous stop-codon mutation in the LAMA2 gene, with mild evolution. When 6.9 years old, she developed focal occipital seizures and absence-like status when awake, with probable relation to an extensive bilateral occipital micropolygyria. Soon afterwards she lost ambulation and developed cognitive deterioration. Our case confirms that the clinical spectrum of MDC1A is more heterogeneous than previously thought.
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18
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Watanabe Y, Ogihara M, Hoshika A. Cluster of epileptic spasms preceded by focal seizures observed in localization-related epilepsy. Brain Dev 2007; 29:571-6. [PMID: 17482399 DOI: 10.1016/j.braindev.2007.03.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2006] [Revised: 03/11/2007] [Accepted: 03/18/2007] [Indexed: 11/16/2022]
Abstract
This study observed six cases of localization-related epilepsy (LRE) with a cluster of epileptic spasms (ES) preceded by focal seizures (FS), defined as FS-ES. Initially, the FS was observed at a mean age 13 months; subsequently FS-ES occurred at the mean age 6 years and 3 months. The average duration from FS to FS-ES was 5 years and 1 month. All cases showed plural types of seizure (more than 2), severe mental retardation, multifoci in an interictal electroencephalogram (EEG), and abnormal findings of brain magnetic resonance imaging or computed tomography. Moreover, it was noted that high-voltage spikes were observed in the occipital area in rapid eye movements sleep on overnight EEG. According to a long-term follow-up study (average 13 years and 4 months), the 6 cases with FS-ES were divided into two types of prognosis. In 2 cases of neural cell migration disorder, the FS-ES could be detected, but in 4 cases of cerebral disorder after birth, it had disappeared. To predict a risk factor for LRE with FS-ES, six cases of FS-ES were compared with 27 cases of LRE without FS-ES. As a result of this study, there is a possibility that infants with severe brain damage may thus demonstrate frequent partial seizures and subsequently develop FS-ES.
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Affiliation(s)
- Yoshiaki Watanabe
- Department of Pediatrics, Tokyo Medical University, 6-7-1 Nishishin-Jyuku, Tokyo 160-0023, Japan.
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19
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Abstract
The congenital muscular dystrophies are autosomal recessive disorders with different clinical phenotypes, the spectrum of which varies between different ethnic communities. We report our findings in 21 Arab children with congenital muscular dystrophy. All 21 cases were of the pure type, with normal mental status, except 1 case with perinatal hypoxic-ischemic insult. Fourteen were laminin alpha2 (merosin) deficient, and six were laminin alpha2 positive; laminin alpha2 status was not determined in one patient. None of the laminin alpha2-deficient patients achieved independent ambulation, whereas three of the laminin alpha2-positive patients were able to walk. The elevated levels of serum creatine kinase did not differentiate the two groups and tended to decrease after the age of 5 years. Radiologic evaluation demonstrated an abnormal central white-matter signal in 11 of 13 laminin alpha2-deficient and in 1 of 5 laminin alpha2-positive patients; none had evidence of brain dysplasia. Nerve conduction velocities were normal in 5 of 5 laminin alpha2-positive patients, whereas in the laminin alpha2-deficient patients, it was slow in 9 of 11 for the motor nerves and normal in 8 of 9 for the sensory nerve. Two of the laminin alpha2-positive patients had pseudohypertrophy of the calves, and two of the laminin alpha2-deficient ones had seizures. The patient in whom the laminin alpha2 status was not determined had a severe course, an abnormal central white-matter signal, and epilepsy and resembled more the laminin alpha2-deficient group.
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Affiliation(s)
- Yousif K R Habeeb
- Neurology Unit, Department of Pediatrics, Mubarak Al-Kabeer Hospital, Kuwait.
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20
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Abstract
Muscular dystrophies are composed of a variety of genetic muscle disorders linked to different chromosomes and loci and associated with different gene mutations that lead to progressive muscle atrophy and weakness. Fukuyama congenital muscular dystrophy is frequently associated with partial and generalized epilepsy and congenital brain anomalies, including cobblestone complex and other neuronal migration defects. We report generalized convulsive epilepsy in a boy with normal brain magnetic resonance imaging and Duchenne muscular dystrophy with deletion of dystrophin gene, and we report absence epilepsy with normal brain magnetic resonance imaging in another boy with limb girdle muscular dystrophy with partial calpain deficiency. We, therefore, review coexisting muscular dystrophies and epilepsy in children. In addition to Fukuyama congenital muscular dystrophy, partial or generalized epilepsy has also been reported in the following types of muscular dystrophies, including Duchenne/Becker dystrophy, facioscapulohumeral dystrophy, congenital muscular dystrophy with partial and complete deficiency of laminin alpha2 (merosin) chain, and limb girdle muscular dystrophy with partial calpain deficiency.
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MESH Headings
- Brain/pathology
- Calpain/deficiency
- Child
- Chromosome Deletion
- Diagnosis, Differential
- Dystrophin/genetics
- Epilepsy, Generalized/complications
- Epilepsy, Generalized/diagnosis
- Epilepsy, Generalized/genetics
- Epilepsy, Tonic-Clonic/complications
- Epilepsy, Tonic-Clonic/diagnosis
- Epilepsy, Tonic-Clonic/genetics
- Follow-Up Studies
- Humans
- Magnetic Resonance Imaging
- Male
- Muscular Dystrophies, Limb-Girdle/complications
- Muscular Dystrophies, Limb-Girdle/diagnosis
- Muscular Dystrophies, Limb-Girdle/genetics
- Muscular Dystrophy, Duchenne/complications
- Muscular Dystrophy, Duchenne/diagnosis
- Muscular Dystrophy, Duchenne/genetics
- Neurologic Examination
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Affiliation(s)
- Chang-Yong Tsao
- Department of Pediatrics, The Ohio State University, Columbus, OH, USA.
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21
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Mendell JR, Boué DR, Martin PT. The congenital muscular dystrophies: recent advances and molecular insights. Pediatr Dev Pathol 2006; 9:427-43. [PMID: 17163796 PMCID: PMC2855646 DOI: 10.2350/06-07-0127.1] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2006] [Accepted: 08/30/2006] [Indexed: 01/16/2023]
Abstract
Over the past decade, molecular understanding of the congenital muscular dystrophies (CMDs) has greatly expanded. The diseases can be classified into 3 major groups based on the affected genes and the location of their expressed protein: abnormalities of extracellular matrix proteins (LAMA2, COL6A1, COL6A2, COL6A3), abnormalities of membrane receptors for the extracellular matrix (fukutin, POMGnT1, POMT1, POMT2, FKRP, LARGE, and ITGA7), and abnormal endoplasmic reticulum protein (SEPN1). The diseases begin in the perinatal period or shortly thereafter. A specific diagnosis can be challenging because the muscle pathology is usually not distinctive. Immunostaining of muscle using a battery of antibodies can help define a disorder that will need confirmation by gene testing. In muscle diseases with overlapping pathological features, such as CMD, careful attention to the clinical clues (e.g., family history, central nervous system features) can help guide the battery of immunostains necessary to target an unequivocal diagnosis.
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Affiliation(s)
- Jerry R Mendell
- Department of Pediatrics, Columbus Children's Hospital and Research Institute and The Ohio State University, 700 Children's Drive, Columbus, OH 43205, USA.
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22
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Leite CC, Lucato LT, Martin MGM, Ferreira LG, Resende MBD, Carvalho MS, Marie SKN, Jinkins JR, Reed UC. Merosin-deficient congenital muscular dystrophy (CMD): a study of 25 Brazilian patients using MRI. Pediatr Radiol 2005; 35:572-9. [PMID: 15750812 DOI: 10.1007/s00247-004-1398-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Revised: 11/23/2004] [Accepted: 12/02/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND Merosin-deficient congenital muscular dystrophy (CMD) is characterized clinically by hypotonia and muscular weakness and, on imaging studies, by white matter (WM) abnormality. OBJECTIVE To evaluate MRI findings in Brazilian patients with merosin-deficient CMD. MATERIALS AND METHODS Twenty-five patients were evaluated using MRI. Three patients presented with partial merosin deficiency and 22 with total merosin deficiency. Follow-up examinations were done in 7 cases. T1- and T2-weighted images were performed in all examinations, and fluid-attenuated inversion recovery (FLAIR) was performed in 15. Enhanced images were done in 11 cases. The WM involvement was classified according to location and severity. RESULTS From 1991 to 2004, 32 MRI examinations were performed. Severe involvement was found in 23 patients in the frontal and temporal lobes, in 18 patients in the parietal lobes, and in 7 patients in the occipital lobes. The brain stem (n=5), cerebellum (n=6), internal capsules (n=1), and external capsules (n=5) were also affected. One patient had occipital pachygyria, and one had cerebellar vermian hypoplasia. No gadolinium enhancement was noted. Follow-up MRI showed no interval change (n=4), progression (n=1), or improvement of the findings (n=2). CONCLUSION This series of patients demonstrated that there was no correlation between the extent of WM abnormality on MRI and the clinical status and degree of merosin deficiency (partial or total). Bilateral WM involvement was seen to be more prominent in the parietal, frontal, and temporal regions of the brain. The brain stem and internal and external capsules were less affected. Cerebellar WM involvement is rare. Changes on follow-up imaging studies did not correlate with the clinical status of the patient.
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Affiliation(s)
- Claudia C Leite
- Department of Radiology, School of Medicine of the University of São Paulo, Av. Dr. Ovidio Pires Campos S/N, Ressonância Magnética, São Paulo, SP, Brazil 05403000.
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23
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Leite CC, Reed UC, Otaduy MCG, Lacerda MTC, Costa MOR, Ferreira LG, Carvalho MS, Resende MBD, Marie SKN, Cerri GG. Congenital Muscular Dystrophy with Merosin Deficiency:1H MR Spectroscopy and Diffusion-weighted MR Imaging. Radiology 2005; 235:190-6. [PMID: 15703311 DOI: 10.1148/radiol.2351031963] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE To prospectively use hydrogen 1 ((1)H) magnetic resonance (MR) spectroscopy and apparent diffusion coefficient (ADC) maps to try to explain the discrepancy between the extensive white matter (WM) abnormalities observed at MR imaging and the relatively mild neurocognitive decline in patients with merosin-deficient congenital muscular dystrophy (CMD). MATERIALS AND METHODS The hospital ethics committee approved this study, and informed consent was obtained. Nine patients (five boys, four girls; age range, 3-9 years; mean, 6 years +/- 2 [standard deviation]) with merosin-deficient CMD underwent T1-weighted, T2-weighted, fluid-attenuated inversion recovery, and diffusion-weighted MR imaging and (1)H MR spectroscopy, which was performed in the parieto-occipital WM (POWM) and frontal WM (FWM) by using stimulated-echo acquisition mode. Metabolite (N-acetylaspartate [NAA], choline-containing compounds [Cho], and myo-inositol [mI]) ratios were calculated in relation to creatine/phosphocreatine (Cr) and water (H(2)O). NAA/Cho was also calculated. ADCs were calculated in approximately the same locations that were studied with spectroscopy. For comparison, (1)H MR spectroscopy (n = 10) and ADC mapping (n = 7) were also performed in 10 healthy age- and sex-matched control subjects (three boys, seven girls; age range, 4-9 years; mean, 6 years +/- 1). Statistical analysis involved the t test for comparison between different groups; correlation between ADC and spectroscopy results was studied with the Pearson test. RESULTS MR imaging revealed evidence of bilateral WM involvement in all patients. Whereas their NAA/Cr and Cho/Cr were normal, their mI/Cr was slightly increased compared with that in control subjects (P = .03 in FWM and P = .07 in POWM), and their NAA/Cho was decreased in POWM (P = .03). NAA/H(2)O, Cr/H(2)O, Cho/H(2)O, and mI/H(2)O were considerably decreased (P < .05 for all) and ADC values were increased (P < .001) in WM in all patients versus these values in WM in control subjects. There was significant correlation between ADC values and metabolite/water ratios (r = -0.777 to -0.967, P < .05). CONCLUSION ADC mapping and (1)H MR spectroscopy reveal abnormally high free-water concentrations in the WM of patients with merosin-deficient CMD.
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Affiliation(s)
- Claudia C Leite
- Clinics Hospital of the University of São Paulo, Rua Mário Amaral 81, São Paulo, SP 040020-020, Brazil.
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24
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Abstract
Floppiness/hypotonia is a common neurologic symptom in infancy. A variety of neuromuscular disorders and central nervous system (CNS) disorders cause floppy infant syndrome (FIS). CNS disorders are the much more common causes of the syndrome than neuromuscular disorders. On long-term follow up, cerebral palsy and mental retardation turn out to be the 2 most common causes of FIS. This review focuses on neuromuscular causes of FIS. With the advent of molecular diagnosis, a few conditions can be diagnosed by DNA analysis of the peripheral lymphocytes (myotonic dystrophy, spinal muscular atrophy); however, for the most part, electrodiagnostic studies and muscle biopsy remain as essential diagnostic tools for FIS. Immunohistochemical study of the biopsied muscle also improves diagnostic capability. Management for most conditions remains supportive.
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Affiliation(s)
- Masanori Igarashi
- From the Department of Pediatrics and Neurology, University of Tennessee, Memphis
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25
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Abstract
Malformations of cortical development are important causes of developmental delay and epilepsy. They are classified by the presumed stage during which normal development is interrupted: neuronal proliferation and differentiation, neuronal migration, and late migration/cortical organization. This article discusses the important malformations in each of these groups, how and why the malformations develop, and their imaging findings. A better understanding of these disorders helps in genetic counseling of the parents and may help in the treatment of associated epilepsy.
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Affiliation(s)
- A James Barkovich
- Department of Radiology, University of California at San Francisco, 505 Parnassus Avenue, Box 0628, San Francisco, CA 94143, USA.
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26
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Abstract
Malformations of cortical development are an important cause of developmental delay and epilepsy. Proper identification of these malformations can greatly help in accurately counseling affected families and, in some cases, in the treatment of the epilepsy. Modem neuroimaging is an important tool in the diagnosis of these malformations.
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Affiliation(s)
- Anthony James Barkovich
- Neuroradiology Section, University of California-San Francisco, 505 Parnassus Avenue, San Francisco, CA 94143-0628, USA.
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27
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Louhichi N, Triki C, Quijano-Roy S, Richard P, Makri S, Méziou M, Estournet B, Mrad S, Romero NB, Ayadi H, Guicheney P, Fakhfakh F. New FKRP mutations causing congenital muscular dystrophy associated with mental retardation and central nervous system abnormalities. Identification of a founder mutation in Tunisian families. Neurogenetics 2003; 5:27-34. [PMID: 14652796 PMCID: PMC2244647 DOI: 10.1007/s10048-003-0165-9] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2003] [Accepted: 10/13/2003] [Indexed: 10/26/2022]
Abstract
The congenital muscular dystrophies (CMD) constitute a clinically and genetically heterogeneous group of autosomal recessive myopathies. Patients show congenital hypotonia, muscle weakness, and dystrophic changes on muscle biopsy. Mutations in four genes (FKT1, POMGnT1, POMT1, FKRP) encoding putative glycosyltransferases have been identified in a subset of patients characterized by a deficient glycosylation of alpha-dystroglycan on muscle biopsy. FKRP mutations account for a broad spectrum of patients with muscular dystrophy, from a severe congenital form with or without mental retardation (MDC1C) to a much milder limb-girdle muscular dystrophy (LGMD2I). We identified two novel homozygous missense FKRP mutations, one, A455D, in six unrelated Tunisian patients and the other, V405L, in an Algerian boy. The patients, between the ages of 3 and 12 years, presented with a severe form of MDC1C with calf hypertrophy and high serum creatine kinase levels. None had ever walked. Two had cardiac dysfunction and one strabismus. They all had mental retardation, microcephaly, cerebellar cysts, and hypoplasia of the vermis. White matter abnormalities were found in five, mostly when cranial magnetic resonance imaging was performed at a young age. These abnormalities were shown to regress in one patient, as has been observed in patients with Fukuyama CMD. Identification of a new microsatellite close to the FKRP gene allowed us to confirm the founder origin of the Tunisian mutation. These results strongly suggest that particular FKRP mutations in the homozygous state induce structural and clinical neurological lesions in addition to muscular dystrophy. They also relate MDC1C to other CMD with abnormal protein glycosylation and disordered brain function.
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Affiliation(s)
- Nacim Louhichi
- Laboratoire de Génétique Moléculaire Humaine
Faculté de Médecine de Sfax3029, Sfax,TN
| | - Chahnez Triki
- Service de neurologie
CHU Habib Bourguiba3029, Sfax,TN
| | - Susana Quijano-Roy
- Service de Pédiatrie, Rééducation et Réanimation Neurorespiratoire
AP-HPHôpital Raymond Poincaré92380 Garches,FR
| | - Pascale Richard
- Unité Fonctionnelle de Cardiogénétique et Myogénétique
Hôpital de La Pitié-SalpêtrièreParis,FR
| | - Samira Makri
- Etablissement Hospitalier Spécialisé Ali Ait Idir
Etablissement Hospitalier Spécialisé Ali Ait Idir16000 Hahad, Alger,DZ
| | - Mériem Méziou
- Service de neurologie
CHU Habib Bourguiba3029, Sfax,TN
| | - Brigitte Estournet
- Service de Pédiatrie, Rééducation et Réanimation Neurorespiratoire
AP-HPHôpital Raymond Poincaré92380 Garches,FR
| | - Slah Mrad
- Service de Pédiatrie, Rééducation et Réanimation Neurorespiratoire
AP-HPHôpital Raymond Poincaré92380 Garches,FR
| | - Norma B. Romero
- Physiopathologie et thérapie du muscle strié
INSERM : U582IFR14Université Pierre et Marie Curie - Paris VIGh Pitie-Salpetriere
47, Boulevard de L'Hopital
75651 PARIS CEDEX 13,FR
| | - Hammadi Ayadi
- Laboratoire de Génétique Moléculaire Humaine
Faculté de Médecine de Sfax3029, Sfax,TN
| | - Pascale Guicheney
- Physiopathologie et thérapie du muscle strié
INSERM : U582IFR14Université Pierre et Marie Curie - Paris VIGh Pitie-Salpetriere
47, Boulevard de L'Hopital
75651 PARIS CEDEX 13,FR
| | - Faiza Fakhfakh
- Laboratoire de Génétique Moléculaire Humaine
Faculté de Médecine de Sfax3029, Sfax,TN
- * Correspondence should be adressed to: Faiza Fakhfakh
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28
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Abstract
The number of new syndromes, loci, and genes responsible for CMD forms has dramatically increased in the last few years, and it has become increasingly evident that the classification of the different forms of CMD is a difficult task. A recent classification separated the forms of CMD that have been mapped (CMD diseases) from the ones with clearly defined clinical and pathologic features that have not been mapped yet (CMD syndromes). Eight CMD forms have been mapped up to now, and the genes responsible for three of them have been identified. This review describes an update of clinical, pathologic, and genetic findings in the different CMD forms.
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Affiliation(s)
- Eugenio Mercuri
- Dubowitz Neuromuscular Centre, Department of Paediatrics, Imperial College Faculty of Medicine, Hammersmith Hospital, London, England
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29
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Gilhuis HJ, ten Donkelaar HJ, Tanke RB, Vingerhoets DM, Zwarts MJ, Verrips A, Gabreëls FJM. Nonmuscular involvement in merosin-negative congenital muscular dystrophy. Pediatr Neurol 2002; 26:30-6. [PMID: 11814732 DOI: 10.1016/s0887-8994(01)00352-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The spectrum of nonmuscular involvement in six children with merosin-negative congenital muscular dystrophy is described. In all children, biochemical, neuroradiologic, cardiac, and neurophysiologic studies were performed. Cerebral structures that were myelinated at gestation, including internal capsule, corpus callosum, brainstem, and cerebellar white matter, demonstrated no abnormalities, whereas the periventricular and subcortical white matter, which were myelinated in the first postnatal year, demonstrated signs of leukoencephalopathy. Cerebrospinal fluid analysis revealed an elevated albumin cerebrospinal fluid to serum ratio in the younger children. Electroencephalogram results were abnormal in the two elder children. One child suffered from congestive cardiomyopathy. The increase in nerve conduction velocity in these children over the years lagged behind those of healthy patients, pointing to a demyelinating neuropathy. We conclude that in merosin-negative congenital muscular dystrophy patients, nonmuscular involvement includes the central and peripheral nervous system and the heart. The pattern of myelination of the brain and nerve conduction slowing suggests a myelination arrest. Merosin deficiency can give rise to a congestive cardiomyopathy, which is of no clinical relevance in the majority of children.
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Affiliation(s)
- H Jacobus Gilhuis
- Department of Paediatric Neurology, Neuromuscular Centre, University Medical Centre St Radboud, 6500 HB Nijmegen, The Netherlands
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Jones KJ, Morgan G, Johnston H, Tobias V, Ouvrier RA, Wilkinson I, North KN. The expanding phenotype of laminin alpha2 chain (merosin) abnormalities: case series and review. J Med Genet 2001; 38:649-57. [PMID: 11584042 PMCID: PMC1734735 DOI: 10.1136/jmg.38.10.649] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Initial reports of patients with laminin alpha2 chain (merosin) deficiency had a relatively homogeneous phenotype, with classical congenital muscular dystrophy (CMD) characterised by severe muscle weakness, inability to achieve independent ambulation, markedly raised creatine kinase, and characteristic white matter hypodensity on cerebral magnetic resonance imaging. We report a series of five patients with laminin alpha2 deficiency, only one of whom has this severe classical CMD phenotype, and review published reports to characterise the expanded phenotype of laminin alpha2 deficiency, as illustrated by this case series. While classical congenital muscular dystrophy with white matter abnormality is the commonest phenotype associated with laminin alpha2 deficiency, 12% of reported cases have later onset, slowly progressive weakness more accurately designated limb-girdle muscular dystrophy. In addition, the following clinical features are reported with increased frequency: mental retardation (~6%), seizures (~8%), subclinical cardiac involvement (3-35%), and neuronal migration defects (4%). At least 25% of patients achieve independent ambulation. Notably, three patients with laminin alpha2 deficiency were asymptomatic, 10 patients had normal MRI (four with LAMA2 mutations reported), and between 10-20% of cases had maximum recorded creatine kinase of less than 1000 U/l. LAMA2 mutations have been identified in 25% of cases. Sixty eight percent of these have the classical congenital muscular dystrophy, but this figure is likely to be affected by ascertainment bias. We conclude that all dystrophic muscle biopsies, regardless of clinical phenotype, should be studied with antibodies to laminin alpha2. In addition, the use of multiple antibodies to different regions of laminin alpha2 may increase the diagnostic yield and provide some correlation with severity of clinical phenotype.
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Affiliation(s)
- K J Jones
- Institute for Neuromuscular Research, The Children's Hospital at Westmead, Parramatta, Sydney, NSW 2124, Australia
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31
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Ruggieri V, Lubieniecki F, Meli F, Diaz D, Ferragut E, Saito K, Brockington M, Muntoni F, Fukuyama Y, Taratuto AL. Merosin-positive congenital muscular dystrophy with mental retardation, microcephaly and central nervous system abnormalities unlinked to the Fukuyama muscular dystrophy and muscular-eye-brain loci: report of three siblings. Neuromuscul Disord 2001; 11:570-8. [PMID: 11525887 DOI: 10.1016/s0960-8966(01)00199-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Classical merosin (2 laminin)-positive congenital muscular dystrophy is a heterogeneous subgroup of disorders; a few cases characterized by severe mental retardation, brain involvement and no ocular abnormalities were called Fukuyama-like congenital muscular dystrophy. We report a family of healthy non-consanguineous parents, with four affected siblings, of which one died at the age of 7 months due to an intercurrent illness, who presented congenital hypotonia, severe mental retardation, microcephaly, delayed psychomotor development, generalized muscular wasting and weakness with mild facial involvement, calf pseudohypertrophy, joint contractures and areflexia. Muscle biopsy disclosed severe muscular dystrophy. Immunostaining for laminin 2 80 kDa and clone Mer3/22B2 monoclonal antibodies, 1 and 1 chain was preserved. Magnetic resonance imaging findings were consistent with pontocerebellar hypoplasia, bilateral opercular abnormalities and focal cortical dysplasia as well as minute periventricular white matter changes. Clusters of small T2-weighted focal hyperintensities in both cerebellar hemispheres consistent with cysts were observed in two of the three siblings studied with magnetic resonance imaging. Ophthalmologic and cardiologic examination was normal. Haplotype analysis using microsatellite markers excluded the Fukuyama congenital muscular dystrophy, LAMA2 and muscle-eye-brain disease loci. Thus, a wider spectrum of phenotypes, gene defects and protein deficiencies might be involved in congenital muscular dystrophy with brain abnormalities.
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Affiliation(s)
- V Ruggieri
- J.P. Garrahan National Paediatric Hospital, Buenos Aires, Argentina
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32
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Avoni P, Monari L, Carelli V, Carcangiu R, Barboni P, Donati C, Badiali L, Baruzzi A, Montagna P. Congenital encephalomyopathy with epilepsy, chorioretinitis, basal ganglia involvement, and muscle minicores. Ann Neurol 2001. [DOI: 10.1002/1531-8249(200003)47:3<395::aid-ana21>3.0.co;2-c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Talim B, Ferreiro A, Cormand B, Vignier N, Oto A, Göğüş S, Cila A, Lehesjoki AE, Pihko H, Guicheney P, Topaloğlu H. Merosin-deficient congenital muscular dystrophy with mental retardation and cerebellar cysts unlinked to the LAMA2, FCMD and MEB loci. Neuromuscul Disord 2000; 10:548-52. [PMID: 11053680 DOI: 10.1016/s0960-8966(00)00140-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We report a case of congenital muscular dystrophy with secondary merosin deficiency, structural involvement of the central nervous system and mental retardation in an 8-year-old girl from a consanguineous family. She had early-onset hypotonia, generalized muscle wasting, with weakness especially of the neck muscles, joint contractures, mental retardation and high creatine kinase. Muscle biopsy showed dystrophic changes with partial deficiency of the laminin alpha(2) chain. Cranial magnetic resonance imaging revealed multiple small cysts in the cerebellum, without cerebral cortical dysplasia or white matter changes. The laminin alpha(2) chain (6q2), Fukuyama type congenital muscular dystrophy (9q31-q33) and muscle-eye-brain disease (1p32-p34) loci were all excluded by linkage analysis. We suggest that this case represents a new entity in the nosology of congenital muscular dystrophy.
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Affiliation(s)
- B Talim
- Department of Pediatric Pathology, Hacettepe Children's Hospital, Ankara, Turkey
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34
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Reed UC, Marie SK, Vainzof M, Gobbo LF, Gurgel JE, Carvalho MS, Resende MB, Espíndola AA, Zatz M, Diament A. Heterogeneity of classic congenital muscular dystrophy with involvement of the central nervous system: report of five atypical cases. J Child Neurol 2000; 15:172-8. [PMID: 10757473 DOI: 10.1177/088307380001500306] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A heterogeneous group of patients with congenital muscular dystrophy associated with clinical or radiologic central nervous system involvement other than the severe classic form with merosin deficiency, muscle-eye-brain disease, and Walker-Warburg syndrome is described. A probable hereditary or familial occurrence could be suggested in all patients. One merosin-positive patient presented severe motor incapacity and cerebral atrophy without any clinical manifestation of central nervous system involvement. A second patient, also merosin-positive, had moderate motor and mental handicap, and epilepsy with no changes in neuroimaging. A third patient, found to have partial merosin deficiency by muscle biopsy, manifested severe psychomotor retardation and cerebral atrophy with foci of abnormal white-matter signal on magnetic resonance imaging. Finally, two merosin-positive siblings with microcephaly, mental retardation, and an incapacitating progressive neuromuscular course, exhibited cataracts without defects of neuronal migration or brain malformation. This report emphasizes the broad clinical spectrum and heterogeneity of merosin-positive congenital muscular dystrophy with associated central nervous system involvement, and illustrates the importance of further studies on clinical, immunohistochemical, and genetic grounds for identifying new subsets of congenital muscular dystrophy.
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Affiliation(s)
- U C Reed
- Department of Neurology, Clínicas Hospital, School of Medicine, University of São Paulo, Brazil.
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Mercuri E, Gruter-Andrew J, Philpot J, Sewry C, Counsell S, Henderson S, Jensen A, Naom I, Bydder G, Dubowitz V, Muntoni F. Cognitive abilities in children with congenital muscular dystrophy: correlation with brain MRI and merosin status. Neuromuscul Disord 1999; 9:383-7. [PMID: 10545041 DOI: 10.1016/s0960-8966(99)00034-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of the study was to evaluate whether children with merosin-positive or merosin-deficient congenital muscular dystrophy (CMD) show any cognitive impairment and whether this is related to brain abnormalities on magnetic resonance imaging (MRI). Twenty-two patients (age range: 5.8-15.3 years) were assessed by the Wechsler Intelligence Scales. Twelve were merosin-positive and ten merosin-deficient. One child had severe mental retardation and could not be tested. The full scale IQ in the remaining 21 ranged from 51 to 134, the verbal IQ ranged from 78 to 136 and the performance from 51 to 136. Of the twelve children with normal merosin one had a mild delay (IQ < 75) and two were borderline (IQ 75-95). Of the ten children with merosin-deficiency, one showed severe mental retardation and could not be tested, one showed a mild delay and two had borderline results. While the children with merosin deficiency with the typical diffuse white matter changes on MRI had normal scores, the children who in addition had cerebellar hypoplasia had lower performance IQ. The child with cortical dysplasia had severe mental retardation. Our results suggest that the spectrum of cognitive abilities in CMD is very wide even within genetically homogeneous conditions.
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Affiliation(s)
- E Mercuri
- Department of Paediatrics, Hammersmith Campus, Imperial College, London, UK
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36
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Philpot J, Cowan F, Pennock J, Sewry C, Dubowitz V, Bydder G, Muntoni F. Merosin-deficient congenital muscular dystrophy: the spectrum of brain involvement on magnetic resonance imaging. Neuromuscul Disord 1999; 9:81-5. [PMID: 10220862 DOI: 10.1016/s0960-8966(98)00110-2] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Children with merosin-deficient congenital muscular dystrophy (CMD) have striking white matter changes on T-2 weighted brain magnetic resonance imaging (MRI). There have been occasional cases with structural abnormalities, mainly involving the occipital cortex. We report our brain imaging findings in 14 children with merosin-deficient CMD. Ten cases had a severe reduction or absence of merosin on immunocytochemistry and four cases had partial reduction. All 14 cases had white matter changes, which appeared after the first 6 months of life and persisted with time. The changes were diffuse and the oldest child scanned (14 years) also showed involvement of the U fibres. Five children with total absence of merosin also had structural abnormalities. One child had moderate mental retardation and epilepsy, mainly characterised by complex partial seizures, with atypical absences, which had been difficult to treat. Brain MRI showed marked occipital agyria and pontocerebellar hypoplasia. The gyral pattern of the rest of the brain looked normal. The four other cases, all with normal intelligence, also had cerebellar hypoplasia with variable involvement of the pons. They did not, however, have neuronal migration defects. It is recognised that several forms of congenital muscular dystrophy, namely Fukuyama CMD, muscle-eye-brain disease and Walker-Warburg syndrome, have structural brain abnormalities and associated severe mental retardation. Our cases demonstrate that a range of structural malformations can also be found in a significant number of children with merosin-deficient CMD.
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Affiliation(s)
- J Philpot
- Department of Paediatrics, Imperial College of Medicine, Hammersmith Hospital, London, UK
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Taratuto AL, Lubieniecki F, Díaz D, Schultz M, Ruggieri V, Saccoliti M, Dubrovsky A. Merosin-deficient congenital muscular dystrophy associated with abnormal cerebral cortical gyration: an autopsy study. Neuromuscul Disord 1999; 9:86-94. [PMID: 10220863 DOI: 10.1016/s0960-8966(98)00112-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
We report clinical, biopsy and autopsy findings in a merosin-deficient congenital muscular dystrophy (CMD) infant with abnormal cortical gyration. Brain showed polymicrogyria and occipital agyria with marginal neuroglial heterotopia and inferior vermis hypoplasia. There was a normal pattern of myelination consistent with early age. Laminin alpha 2 chain was also absent in myocardium, brain pial-glial membrane, brain and skin blood vessels as well as intramuscular and skin nerves. Occasional basal lamina gaps were found in muscle fibres but not in brain-blood vessels. This is the first autopsy study in a merosin-deficient CMD case with abnormal cortical gyration.
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Affiliation(s)
- A L Taratuto
- National Pediatric Hospital, Buenos Aires, Argentina.
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38
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Mercuri E, Anker S, Philpot J, Sewry C, Dubowitz V, Muntoni F. Visual function in children with merosin-deficient and merosin-positive congenital muscular dystrophy. Pediatr Neurol 1998; 18:399-401. [PMID: 9650678 DOI: 10.1016/s0887-8994(97)00222-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
This study evaluates whether abnormalities of visual function are present in children with congenital muscular dystrophy and whether these, if present, are associated with merosin status or magnetic resonance imaging (MRI) findings. Twenty children (age range 5-17 years) with a diagnosis of classical congenital muscular dystrophy were assessed on visual acuity, stereopsis, and visual fields and the results compared with merosin status and MRI findings. Visual-evoked potential results were available for 14 of 20 children. All 20 children revealed normal results on all the clinical tests assessing visual function, irrespective of their merosin status or of MRI findings. Visual-evoked potentials were normal in the children with merosin-positive congenital muscular dystrophy but were abnormal in those with merosin deficiency. Unlike the other forms of congenital muscular dystrophy, which are associated with structural brain changes and eye involvement, visual function was always normal in the classical form of congenital muscular dystrophy. Interestingly, visual function was normal also in the group of children with merosin-deficient congenital muscular dystrophy who manifested white matter changes involving the occipital lobes on MRI and abnormal visual evoked potentials. Further studies are needed to specify the nature of the white matter changes observed with MRI and the reason for the dissociation between clinical and neurophysiologic findings.
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Affiliation(s)
- E Mercuri
- Department of Paediatrics, Royal Postgraduate Medical School, University College, London, United Kingdom
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39
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Kamiguchi H, Hlavin ML, Yamasaki M, Lemmon V. Adhesion molecules and inherited diseases of the human nervous system. Annu Rev Neurosci 1998; 21:97-125. [PMID: 9530493 DOI: 10.1146/annurev.neuro.21.1.97] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mutations in the human genes for the adhesion molecules Po, L1, and merosin cause severe abnormalities in nervous system development. Po and merosin are required for normal myelination in the nervous system, and L1 is essential for development of major axon pathways such as the corticospinal tract and corpus callosum. While mutations that lead to a loss of the adhesive function of these molecules produce severe phenotypes, mutations that disrupt intracellular signals or intracellular interactions are also deleterious. Geneticists have found that more than one clinical syndrome can be caused by mutations in each of these adhesion molecules, confirming that these proteins are multifunctional. This review focuses on identifying common mechanisms by which mutations in adhesion molecules alter neural development.
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Affiliation(s)
- H Kamiguchi
- Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106, USA
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40
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Abstract
The congenital muscular dystrophies (CMDs) comprise a heterogeneous group of muscle disorders with onset in utero or during the first year of life. Several forms of CMD show various types of brain involvement in addition to a muscular dystrophy. Two forms are defined at the molecular level: merosin deficient-CMD caused by mutations in the LAMA2-gene on chromosome 6q2. Fukuyama congenital muscular dystrophy (FCMD) is prevalent in Japan and caused by an as yet unidentified gene on chromosome 9q31. At least two further forms of CMD with brain involvement are nosologically well defined: Walker--Warburg-CMD is characterized by lissencephaly type 11, eye dysgenesis and muscular dystrophy. This autosomal recessive disorder is fatal or results in complete lack of development. A similar but much milder phenotype with pachygyria of the brain, various degrees of eye changes and milder muscular dystrophy that is compatible with achievement of simple motor milestones has been described under the name of muscle-eye-brain disease (MEB) in Finland. A number of nosologically less distinct forms of muscular dystrophy have been outlined such as 'pure' CMD without brain involvement, CMD with cerebellar hypoplasia or CMD type Ullrich with hyperelasticity of the distal joints. Several other CMD phenotypes are known, some of which are suggestive of more distinctly separate nosological entities due to their occurrence in siblings or due to a characteristic pattern of clinical, histopathological and imaging features, and await further clarification.
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Affiliation(s)
- T Voit
- Department of Pediatrics and Pediatric Neurology, University of Essen, Germany.
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41
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Guicheney P, Vignier N, Zhang X, He Y, Cruaud C, Frey V, Helbling-Leclerc A, Richard P, Estournet B, Merlini L, Topaloglu H, Mora M, Harpey JP, Haenggeli CA, Barois A, Hainque B, Schwartz K, Tomé FM, Fardeau M, Tryggvason K. PCR based mutation screening of the laminin alpha2 chain gene (LAMA2): application to prenatal diagnosis and search for founder effects in congenital muscular dystrophy. J Med Genet 1998; 35:211-7. [PMID: 9541105 PMCID: PMC1051244 DOI: 10.1136/jmg.35.3.211] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Classical congenital muscular dystrophy with merosin deficiency is caused by mutations in the laminin alpha2 chain gene (LAMA2). Extended sequencing of the introns flanking the 64 LAMA2 exons was carried out and, based on these sequences, oligonucleotide primers were designed to amplify the coding region of each exon separately. By PCR-SSCP analysis, we identified eight new mutations in nine families originating from various countries. All induced a premature truncation of the protein, either in the short arm or in the globular C-terminal domain. A 2 bp deletion in exon 13, 2098delAG, was found in three French non-consanguineous families and a nonsense mutation of exon 20, Cys967stop, in two other non-consanguineous families originating from Italy. Determination of rare intragenic polymorphisms permitted us to show evidence of founder effects for these two mutations suggesting a remote degree of consanguinity between the families. Other, more frequent polymorphisms, G to A 1905 (exon 12), A to G 2848 (exon 19), A to G 5551 (exon 37), and G to A 6286 (exon 42), were used as intragenic markers for prenatal diagnosis. This study provides valuable methods for determining the molecular defects in LAMA2 causing merosin deficient congenital muscular dystrophy.
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Affiliation(s)
- P Guicheney
- INSERM U153, Groupe Hospitalier Pitié-Salpêtrière, Institut de Myologie, Paris, France
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42
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Brett FM, Costigan D, Farrell MA, Heaphy P, Thornton J, King MD. Merosin-deficient congenital muscular dystrophy and cortical dysplasia. Eur J Paediatr Neurol 1998; 2:77-82. [PMID: 10724100 DOI: 10.1016/s1090-3798(98)80045-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Congenital muscular dystrophy (CMD) encompasses a heterogenous group of muscle disorders with autosomal recessive inheritance, characterized by muscular weakness and hypotonia at birth or within the first few months of life and developmental delay. Merosin-deficient CMD is a clinically distinct form which may be associated with significant abnormalities of the brain detectable by neuroimaging. We report two siblings of consanguineous parents with merosin-deficient CMD in an Irish family who in addition to the characteristic white matter abnormalities on neuroimaging, had occipital dysplasia. Clinical, electrophysiological muscle biopsy findings and neuroimaging were very similar in both cases. Although merosin-deficient CMD with white matter abnormalities on neuroimaging is well documented in the literature, the association with occipital dysplasia has only rarely been reported. The appearance of an identical cortical defect in these siblings suggests an underlying genetic mechanism.
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Affiliation(s)
- F M Brett
- Department of Neuropathology, Beaumont Hospital, Dublin, Ireland
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Topaloğlu H, Yetük M, Talim B, Akçören Z, Cağlar M. Merosin-positive congenital muscular dystrophy with mental retardation and cataracts: a new entity in two families. Eur J Paediatr Neurol 1997; 1:127-31. [PMID: 10728208 DOI: 10.1016/s1090-3798(97)80045-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Merosin-positive congenital muscular dystrophy is a heterogenous group of disorders with varying clinical presentations and severity. In general, central nervous system involvement is not present. There is also evidence for still unclassified forms. Here we report three cases in two families with merosin-positive congenital muscular dystrophy, mild mental retardation, bilateral cataracts and normal cranial magnetic resonance imaging. To our knowledge, such an association has not been reported previously, and thus is a new entity within congenital muscular dystrophy nosology.
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Affiliation(s)
- H Topaloğlu
- Hacettepe University Children's Hospital, Ankara, Turkey
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44
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Dubowitz V. 41st ENMC International Workshop on Congenital Muscular Dystrophy 8-10 March 1996, Naarden, The Netherlands. Neuromuscul Disord 1996; 6:295-306. [PMID: 8887959 DOI: 10.1016/0960-8966(96)00358-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- V Dubowitz
- Department of Paediatrics and Neonatal Medicine royal Postgraduate Medical School, London U.K
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