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Jaramillo CJ, Gibbons T, Rose R, Walsh J. Fatal Case of Exercise Collapse Associated with Sickle Cell Trait with Novel Underlying LAMA2 Mutation. Am J Forensic Med Pathol 2024; 45:177-181. [PMID: 38261548 DOI: 10.1097/paf.0000000000000916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
ABSTRACT Sickle cell trait is typically thought to be an asymptomatic carrier state, but it is rarely associated with exertional rhabdomyolysis in cases termed Exercise Collapse Associated with Sickle Cell Trait (ECAST). In a subset of these cases, underlying disease contributes to the development and/or severity of the ensuing medical complications. We describe the first ever case of ECAST reported in a previously asymptomatic, multiply deployed, highly physically active service member with an underlying heterozygous LAMA2 mutation. Moreover, the mutation identified via whole exome sequencing is a novel, likely pathogenic variant that has yet to be described in the literature.
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Affiliation(s)
| | - Thomas Gibbons
- 59th Medical Wing, Clinical Investigations and Research Support Laboratory, Joint Base San Antonio-Lackland, San Antonio, TX
| | - Rachel Rose
- Department of Pathology, Womack Army Medical Center, Fort Liberty, NC
| | - John Walsh
- Forensic Pathology Investigations, Armed Forces Medical Examiner System, Dover Air Force Base, DE
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Lail G, Siu VM, Leung A. Clinical Reasoning: A 19-Month-Old Girl With Infantile-Onset Myopathy and White Matter Changes. Neurology 2024; 102:e209258. [PMID: 38484275 DOI: 10.1212/wnl.0000000000209258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 01/17/2024] [Indexed: 03/19/2024] Open
Abstract
We describe the case of a 19-month-old girl presenting with gross motor delays, hypotonia, diminished deep tendon reflexes, hyperCKaemia, extensive white matter changes on MRI brain, and electromyography studies consistent with myopathy. The differential diagnosis for infantile-onset hypotonia and muscle weakness is broad. It includes numerous subtypes of genetic disorders, including congenital muscular dystrophies, congenital myopathies, congenital myasthenic syndromes, spinal muscular atrophy, single-gene genetic syndromes, and inborn errors of metabolism. We outline our clinical approach leading to the diagnosis of a distinctive genetic neuromuscular condition essential for neurologists and geneticists working with patients of all ages to recognize.
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Affiliation(s)
- Gurnoor Lail
- From the Department of Paediatrics, Division of Medical Genetics (G.L., V.M.S.), and Department of Medical Imaging (A.L.), Western University, London, Ontario, Canada
| | - Victoria M Siu
- From the Department of Paediatrics, Division of Medical Genetics (G.L., V.M.S.), and Department of Medical Imaging (A.L.), Western University, London, Ontario, Canada
| | - Andrew Leung
- From the Department of Paediatrics, Division of Medical Genetics (G.L., V.M.S.), and Department of Medical Imaging (A.L.), Western University, London, Ontario, Canada
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Djordjevic D, Alawneh I, Amburgey K, Yuki KE, Kyriakopoulou LG, Navickiene V, Stavropoulos J, Yoon G, Dowling JJ, Gonorazky H. A novel deep intronic variant in LAMA2 identified by RNA sequencing. Neuromuscul Disord 2024; 39:19-23. [PMID: 38691940 DOI: 10.1016/j.nmd.2024.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 03/30/2024] [Accepted: 04/02/2024] [Indexed: 05/03/2024]
Abstract
LAMA2-related muscular dystrophy is caused by pathogenic variants of the alpha2 subunit of Laminin. This common form of muscular dystrophy is characterized by elevated CK >1000IU/L, dystrophic changes on muscle biopsy, complete or partial absence of merosin staining, and both central and peripheral nervous system involvement. Advancements in genomic testing using NGS and wider application of RNA sequencing has expanded our knowledge of novel non-coding pathogenic variants in LAMA2. RNA sequencing is an increasingly utilized technique to directly analyze the transcriptome, through creation of a complementary DNA (cDNA) from the transcript within a tissue sample. Here we describe a homozygous deep intronic variant that produces a novel splice junction in LAMA2 identified by RNA sequencing analysis in a patient with a clinical phenotype in keeping with LAMA2-related muscular dystrophy. Furthermore, in this case merosin staining was retained suggestive of a functional deficit.
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Affiliation(s)
- Djurdja Djordjevic
- Division of Neurology, BC Children's Hospital, Vancouver, British Columbia, Canada
| | - Issa Alawneh
- Division of Neurology, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - Kimberly Amburgey
- Division of Neurology, The Hospital for Sick Children, University of Toronto, Toronto, Canada; Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada
| | - Kyoko E Yuki
- Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada
| | - Lianna G Kyriakopoulou
- Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada
| | - Vilma Navickiene
- Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada
| | - Jim Stavropoulos
- Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada
| | - Grace Yoon
- Division of Neurology, The Hospital for Sick Children, University of Toronto, Toronto, Canada; Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada
| | - James J Dowling
- Division of Neurology, The Hospital for Sick Children, University of Toronto, Toronto, Canada; Division of Genome Diagnostics, The Hospital for Sick Children. University of Toronto. Toronto, Canada; Program of Genetic and Genome Biology, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - Hernan Gonorazky
- Division of Neurology, The Hospital for Sick Children, University of Toronto, Toronto, Canada.
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Safwat S, Flannery KP, El Beheiry AA, Mokhtar MM, Abdalla E, Manzini MC. Genetic blueprint of congenital muscular dystrophies with brain malformations in Egypt: A report of 11 families. Neurogenetics 2024; 25:93-102. [PMID: 38296890 PMCID: PMC11076401 DOI: 10.1007/s10048-024-00745-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 01/12/2024] [Indexed: 02/02/2024]
Abstract
Congenital muscular dystrophies (CMDs) are a group of rare muscle disorders characterized by early onset hypotonia and motor developmental delay associated with brain malformations with or without eye anomalies in the most severe cases. In this study, we aimed to uncover the genetic basis of severe CMD in Egypt and to determine the efficacy of whole exome sequencing (WES)-based genetic diagnosis in this population. We recruited twelve individuals from eleven families with a clinical diagnosis of CMD with brain malformations that fell into two groups: seven patients with suspected dystroglycanopathy and five patients with suspected merosin-deficient CMD. WES was analyzed by variant filtering using multiple approaches including splicing and copy number variant (CNV) analysis. We identified likely pathogenic variants in FKRP in two cases and variants in POMT1, POMK, and B3GALNT2 in three individuals. All individuals with merosin-deficient CMD had truncating variants in LAMA2. Further analysis in one of the two unsolved cases showed a homozygous protein-truncating variant in Feline Leukemia Virus subgroup C Receptor 1 (FLVCR1). FLVCR1 loss of function has never been previously reported. Yet, loss of function of its paralog, FLVCR2, causes lethal hydranencephaly-hydrocephaly syndrome (Fowler Syndrome) which should be considered in the differential diagnosis for dystroglycanopathy. Overall, we reached a diagnostic rate of 86% (6/7) for dystroglycanopathies and 100% (5/5) for merosinopathy. In conclusion, our results provide further evidence that WES is an important diagnostic method in CMD in developing countries to improve the diagnostic rate, management plan, and genetic counseling for these disorders.
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Affiliation(s)
- Sylvia Safwat
- Department of Neuroscience and Cell Biology, Child Health Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
- Department of Human Genetics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Kyle P Flannery
- Department of Neuroscience and Cell Biology, Child Health Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Ahmed A El Beheiry
- Department of Radiodiagnosis and Interventional Radiology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Mohamed M Mokhtar
- Department of Radiodiagnosis and Interventional Radiology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Ebtesam Abdalla
- Department of Human Genetics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - M Chiara Manzini
- Department of Neuroscience and Cell Biology, Child Health Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA.
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Yang X, Li X, Bao Q, Wang Z, He S, Qu X, Tang Y, Song B, Huang J, Yi G. Uncovering Evolutionary Adaptations in Common Warthogs through Genomic Analyses. Genes (Basel) 2024; 15:166. [PMID: 38397156 PMCID: PMC10888464 DOI: 10.3390/genes15020166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/15/2024] [Accepted: 01/20/2024] [Indexed: 02/25/2024] Open
Abstract
In the Suidae family, warthogs show significant survival adaptability and trait specificity. This study offers a comparative genomic analysis between the warthog and other Suidae species, including the Luchuan pig, Duroc pig, and Red River hog. By integrating the four genomes with sequences from the other four species, we identified 8868 single-copy orthologous genes. Based on 8868 orthologous protein sequences, phylogenetic assessments highlighted divergence timelines and unique evolutionary branches within suid species. Warthogs exist on different evolutionary branches compared to DRCs and LCs, with a divergence time preceding that of DRC and LC. Contraction and expansion analyses of warthog gene families have been conducted to elucidate the mechanisms of their evolutionary adaptations. Using GO, KEGG, and MGI databases, warthogs showed a preference for expansion in sensory genes and contraction in metabolic genes, underscoring phenotypic diversity and adaptive evolution direction. Associating genes with the QTLdb-pigSS11 database revealed links between gene families and immunity traits. The overlap of olfactory genes in immune-related QTL regions highlighted their importance in evolutionary adaptations. This work highlights the unique evolutionary strategies and adaptive mechanisms of warthogs, guiding future research into the distinct adaptability and disease resistance in pigs, particularly focusing on traits such as resistance to African Swine Fever Virus.
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Affiliation(s)
- Xintong Yang
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China;
| | - Xingzheng Li
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
| | - Qi Bao
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
| | - Zhen Wang
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
| | - Sang He
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
| | - Xiaolu Qu
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
| | - Yueting Tang
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
- School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Bangmin Song
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
- School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Jieping Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China;
| | - Guoqiang Yi
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Livestock and Poultry Multi-Omics of MARA, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China; (X.Y.); (X.L.); (Q.B.); (Z.W.); (S.H.); (X.Q.); (Y.T.); (B.S.)
- Kunpeng Institute of Modern Agriculture at Foshan, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Foshan 528226, China
- Bama Yao Autonomous County Rural Revitalization Research Institute, Bama 547500, China
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Saito Y, Ishiyama A, Saito Y, Komaki H, Sasaki M. Myelin abnormalities in merosin-deficient congenital muscular dystrophy. Muscle Nerve 2024; 69:55-63. [PMID: 37933889 DOI: 10.1002/mus.28002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 10/19/2023] [Accepted: 10/21/2023] [Indexed: 11/08/2023]
Abstract
INTRODUCTION/AIMS Merosin is a protein complex located in the basement membrane of skeletal muscles and laminin α2-containing regions of the central and peripheral nervous systems. However, because of the prominence of muscle-related symptoms, peripheral neuropathy associated with merosin-deficient congenital muscular dystrophy type 1A (MDC1A) has received little clinical attention. This study aimed to present pathological changes in intramuscular nerves of three patients with MDC1A and discuss their relationship with electrophysiological findings to provide new evidence of peripheral nerve involvement in MDC1A. METHODS MDC1A was confirmed by clinical features, muscle biopsy, and genetic testing for variants in LAMA2. To clarify peripheral nerve involvement, we statistically evaluated electrophysiological and muscle pathology findings of intramuscular nerves. These findings were compared with those of age-matched boys with Duchenne muscular dystrophy (DMD) as controls with normal nerves. Nerve conduction studies (NCS) were performed before biopsy. Biopsied intramuscular nerves were examined with electron microscopy using g-ratio, which is the ratio of axon diameter to myelinated fiber diameter. RESULTS The myelin sheaths were significantly thinner in MDC1A patients than in age-matched DMD patients, with a mean g-ratio of 0.76 ± 0.07 in MDC1A patients and 0.65 ± 0.14 in DMD patients (p < .0001). No neuropathic changes were identified in muscle pathology. Low compound muscle action potential amplitudes, positive sharp waves and fibrillation potentials, and low-amplitude motor unit potentials with increased polyphasia indicated myopathic changes; no neurogenic changes were seen. DISCUSSION We postulate that the thin myelin associated with MDC1A reflects the role of merosin in myelin maturation.
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Affiliation(s)
- Yoshihiko Saito
- Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan
- Department of Neuromuscular Research, National Institute of Neuroscience, NCNP, Tokyo, Japan
| | - Akihiko Ishiyama
- Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan
- Department of Neuromuscular Research, National Institute of Neuroscience, NCNP, Tokyo, Japan
| | - Yuko Saito
- Department of Clinical Laboratory, National Center Hospital, NCNP, Tokyo, Japan
| | - Hirofumi Komaki
- Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan
| | - Masayuki Sasaki
- Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan
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Bouman K, van Doorn JLM, Groothuis JT, Wijkstra PJ, van Engelen BGM, Erasmus CE, Doorduin J, Voermans NC. Respiratory function in LAMA2-related muscular dystrophy and SELENON-related congenital myopathy, a 1.5-year natural history study. Eur J Paediatr Neurol 2024; 48:30-39. [PMID: 38008001 DOI: 10.1016/j.ejpn.2023.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 11/10/2023] [Accepted: 11/12/2023] [Indexed: 11/28/2023]
Abstract
INTRODUCTION LAMA2-related muscular dystrophy (LAMA2-MD) and SELENON(SEPN1)-related congenital myopathy (SELENON-RM) are rare neuromuscular diseases with respiratory impairment from a young age. Prospective natural history studies are needed for prevalence estimations, respiratory characterization, optimizing clinical care and selecting outcome measures for trial readiness. METHODS Our prospective 1.5-year natural history study included spirometry (forced vital capacity (FVC); difference between upright and supine vital capacity (dVC)), respiratory muscle strength tests (sniff nasal inspiratory pressure (SNIP)) (age≥5 years), and diaphragm ultrasound (thickness; thickening; echogenicity; all ages). RESULTS Twenty-six LAMA2-MD patients (M = 8, median 21 [9; 31] years) and 11 SELENON-RM patients (M = 8, 20 [10; 33] years) were included. At baseline, 17 (85 %) LAMA2-MD (FVC%: 59 % [33; 68]) and all SELENON-RM patients (FVC%: 34 % [31; 46]) had an impaired respiratory function (FVC%<80 %). Nine (35 %) LAMA2-MD and eight (73 %) SELENON-RM patients received mechanical ventilation at baseline, and two additional SELENON-RM patients started during follow-up. Contrarily to LAMA2-MD, SELENON-RM patients had severe diaphragm atrophy (diaphragm thickness z-score: 2.5 [-3.1; -2.1]) and dysfunction (diaphragm thickness ratio: 1.2 [1.0; 1.7]; dVC: 30 % [7.7; 41]). SNIP was low in both neuromuscular diseases and correlated with motor function. In SELENON-RM, respiratory function decreased during follow-up. CONCLUSION The majority of LAMA2-MD and all SELENON-RM patients had respiratory impairment. SELENON-RM patients showed lower respiratory function which was progressive, more prevalent mechanical ventilation, and more severe diaphragm atrophy and dysfunction than LAMA2-MD patients. Spirometry (FVC%, dVC) and respiratory muscle strength tests (SNIP) are useful in clinical care and as outcome measure in clinical trials. CLINICAL TRIAL NUMBER NCT04478981.
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Affiliation(s)
- Karlijn Bouman
- Department of Pediatric Neurology, Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital, Radboud university medical center, Nijmegen, the Netherlands; Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, the Netherlands.
| | - Jeroen L M van Doorn
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, the Netherlands
| | - Jan T Groothuis
- Department of Rehabilitation, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, the Netherlands
| | - Peter J Wijkstra
- Department of Pulmonary Diseases and Home Mechanical Ventilation, University Medical Centre Groningen, Groningen, the Netherlands
| | - Baziel G M van Engelen
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, the Netherlands
| | - Corrie E Erasmus
- Department of Pediatric Neurology, Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital, Radboud university medical center, Nijmegen, the Netherlands
| | - Jonne Doorduin
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, the Netherlands
| | - Nicol C Voermans
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, the Netherlands
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Kulczyk AW. Artificial intelligence and the analysis of cryo-EM data provide structural insight into the molecular mechanisms underlying LN-lamininopathies. Sci Rep 2023; 13:17825. [PMID: 37857770 PMCID: PMC10587063 DOI: 10.1038/s41598-023-45200-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 10/17/2023] [Indexed: 10/21/2023] Open
Abstract
Laminins (Lm) are major components of basement membranes (BM), which polymerize to form a planar lattice on cell surface. Genetic alternations of Lm affect their oligomerization patterns and lead to failures in BM assembly manifesting in a group of human disorders collectively defined as Lm N-terminal domain lamininopathies (LN-lamininopathies). We have employed a recently determined cryo-EM structure of the Lm polymer node, the basic repeating unit of the Lm lattice, along with structure prediction and modeling to systematically analyze structures of twenty-three pathogenic Lm polymer nodes implicated in human disease. Our analysis provides the detailed mechanistic explanation how Lm mutations lead to failures in Lm polymerization underlining LN-lamininopathies. We propose the new categorization scheme of LN-lamininopathies based on the insight gained from the structural analysis. Our results can help to facilitate rational drug design aiming in the treatment of Lm deficiencies.
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Affiliation(s)
- Arkadiusz W Kulczyk
- Institute for Quantitative Biomedicine, Rutgers University, 174 Frelinghuysen Road, Piscataway, NJ, 08854, USA.
- Department of Biochemistry & Microbiology, Rutgers University, 75 Lipman Drive, New Brunswick, NJ, 08901, USA.
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Bouman K, Groothuis JT, Doorduin J, van Alfen N, Udink Ten Cate FEA, van den Heuvel FMA, Nijveldt R, Kamsteeg EJ, Dittrich ATM, Draaisma JMT, Janssen MCH, van Engelen BGM, Erasmus CE, Voermans NC. LAMA2-Related Muscular Dystrophy Across the Life Span: A Cross-sectional Study. Neurol Genet 2023; 9:e200089. [PMID: 37476021 PMCID: PMC10356133 DOI: 10.1212/nxg.0000000000200089] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 05/31/2023] [Indexed: 07/22/2023]
Abstract
Background and Objectives LAMA2-related muscular dystrophy (LAMA2-MD) is a rare neuromuscular disease characterized by proximal and axial muscle weakness, rigidity of the spine, scoliosis, and respiratory impairment. No curative treatment options exist, yet promising preclinical studies are ongoing. Currently, there is a paucity on natural history data, and appropriate clinical and functional outcome measures are needed. We aim for deep clinical phenotyping, establishment of a well-characterized baseline cohort for prospective follow-up and recruitment for future clinical trials, improvement of clinical care, and selection of outcome measures for reaching trial readiness. Methods We performed a cross-sectional, single-center, observational study. This study included neurologic examination and functional measurements among others the Motor Function Measure 20/32 (MFM-20/32) as primary outcome measure, accelerometry, questionnaires, muscle ultrasound, respiratory function tests, electrocardiography and echocardiography, and dual-energy X-ray absorptiometry. Results Twenty-seven patients with genetically confirmed LAMA2-MD were included (21 ± 13 years; M = 9; ambulant = 7). Axial and proximal muscle weakness was most pronounced. The mean MFM-20/32 score was 42.0% ± 29.4%, with domain 1 (standing and transfers) being severely affected and domain 3 (distal muscle function) relatively spared. Physical activity as measured through accelerometry showed very strong correlations to MFM-20/32 (Pearson correlation, -0.928, p < 0.01). Muscle ultrasound showed symmetrically increased echogenicity, with the sternocleidomastoid muscle most affected. Respiratory function was impaired in 85% of patients without prominent diaphragm dysfunction and was independent of age. Ten patients (37%) needed (non)invasive ventilatory support. Cardiac assessment revealed QRS fragmentation in 62%, abnormal left ventricular global longitudinal strain in 25%, and decreased left ventricular ejection fraction in 14% of patients. Decreased bone quality leading to fragility fractures was seen in most of the patients. Discussion LAMA2-MD has a widely variable phenotype. Based on the results of this cross-sectional study and current standards of care for congenital muscular dystrophies, we advise routine cardiorespiratory follow-up and optimization of bone quality. We propose MFM-20/32, accelerometry, and muscle ultrasound for assessing disease severity and progression. For definitive clinical recommendations and outcome measures, natural history data are needed. Clinical Trials Registration This study was registered at clinicaltrials.gov (NCT04478981, 21 July 2020). The first patient was enrolled in September 2020.
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Affiliation(s)
- Karlijn Bouman
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jan T Groothuis
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jonne Doorduin
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Nens van Alfen
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Floris E A Udink Ten Cate
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Frederik M A van den Heuvel
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Robin Nijveldt
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Erik-Jan Kamsteeg
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Anne T M Dittrich
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jos M T Draaisma
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Mirian C H Janssen
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Baziel G M van Engelen
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Corrie E Erasmus
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Nicol C Voermans
- From the Department of Neurology (K.B., J.D., N.A., B.G.M.E., N.C.V.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Neurology (K.B., C.E.E.), Donders Institute for Brain, Cognition and Behaviour, Amalia Children's Hospital; Department of Rehabilitation (J.T.G.), Donders Institute for Brain, Cognition and Behaviour; Department of Pediatric Cardiology (F.E.A.U.C.), Amalia Children's Hospital; Department of Cardiology (F.M.A.H., R.N.); Department of Human Genetics (E.-J.K.); Department of Pediatrics (A.T.M.D., J.M.T.D.), Radboud Institute for Health Sciences, Amalia Children's Hospital; and Department of Internal Medicine (M.C.H.J.), Radboud University Medical Center, Nijmegen, The Netherlands
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10
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Redhead C, Taye N, Hubmacher D. En route towards a personalized medicine approach: Innovative therapeutic modalities for connective tissue disorders. Matrix Biol 2023; 122:46-54. [PMID: 37657665 PMCID: PMC10529529 DOI: 10.1016/j.matbio.2023.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/25/2023] [Accepted: 08/27/2023] [Indexed: 09/03/2023]
Abstract
Connective tissue disorders can be caused by pathogenic variants (mutations) in genes encoding extracellular matrix (ECM) proteins. Such disorders typically manifest during development or postnatal growth and result in significant morbidity and mortality. The development of curative treatments for connective tissue disorders is hampered in part by the inability of many mature connective tissues to efficiently regenerate. To be most effective, therapeutic strategies designed to preserve or restore tissue function will likely need to be initiated during phases of significant endogenous connective tissue remodeling and organ sculpting postnatally and directly target the underlying ECM protein mutations. With recent advances in whole exome sequencing, in-vitro and in-vivo disease modeling, and the development of mutation-specific molecular therapeutic modalities, it is now feasible to directly correct disease-causing mutations underlying connective tissue disorders and ameliorate their pathogenic consequences. These technological advances may lead to potentially curative personalized medicine approaches for connective tissue disorders that have previously been considered incurable. In this review, we highlight innovative therapeutic modalities including gene replacement, exon skipping, DNA/mRNA editing, and pharmacological approaches that were used to preserve or restore tissue function in the context of connective tissue disorders. Inherent to a successful application of these approaches is the need to deepen the understanding of mechanisms that regulate ECM formation and homeostasis, and to decipher how individual mutations in ECM proteins compromise ECM and connective tissue development and function.
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Affiliation(s)
- Charlene Redhead
- Orthopedic Research Laboratories, Leni & Peter W. May Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Nandaraj Taye
- Orthopedic Research Laboratories, Leni & Peter W. May Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Dirk Hubmacher
- Orthopedic Research Laboratories, Leni & Peter W. May Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
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11
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Matsunuma M, Kan R, Yamada Y, Hamada K, Kanagawa M, Nomizu M, Kikkawa Y. Chain-specificity of laminin α1-5 LG45 modules in the recognition of carbohydrate-linked receptors and intramolecular binding. Sci Rep 2023; 13:10430. [PMID: 37369727 DOI: 10.1038/s41598-023-37533-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 06/23/2023] [Indexed: 06/29/2023] Open
Abstract
Laminins are a family of heterotrimers composed of α-, β-, and γ-chains in the basement membrane. Five α chains contain laminin globular (LG) domain consisting of five tandem modules (LG1-5 modules) at their C-terminus. Each LG45 modules is connected to a compact cloverleaf-shaped structure of LG1-3 through a flexible linker. Although the accumulated studies of the LG45 modules have suggested differences in each α chain regarding the binding of carbohydrate chain and intramolecular interaction, this remains unclear. In this study, to characterize their functions comparatively, we produced recombinant proteins of LG45 modules of human laminin α1-5 chains. Dystroglycan (DG) modified with matriglycan readily bound to the LG45 modules of α1 and α2 chains but not to the other α chains. In contrast, heparin bound to the LG45 modules of the α chains, except for α2. The binding of heparan sulfate/heparin-linked syndecans (SDCs) to LG45 modules was influenced by their core proteins. Furthermore, the α1 and α4LG45 modules bound to SDCs in a pH-dependent manner. A cell adhesion assay showed that HEK293 cells could readily adhere to the LG45 modules of α3-5 chains through a combination of SDCs and integrins. Moreover, α5LG45 modules bound to the E8 fragment, which includes the C-terminus of the laminin coiled-coil (LCC) domain and LG1-3 modules, but α2LG45 modules did not. The results suggested that although α5LG45 modules was fixed within the LG domain, α2LG45 modules was freely placed in the vicinity of LG1-3. Our findings provide information for investigation of the structural and functional diversity of basement membranes.
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Affiliation(s)
- Masumi Matsunuma
- Department of Clinical Biochemistry, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Ryuji Kan
- Department of Clinical Biochemistry, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Yuji Yamada
- Department of Clinical Biochemistry, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Keisuke Hamada
- Department of Clinical Biochemistry, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Motoi Kanagawa
- Department of Cell Biology and Molecular Medicine, Ehime University Graduate School of Medicine, Toon, Ehime, 791-0295, Japan
| | - Motoyoshi Nomizu
- Department of Clinical Biochemistry, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Yamato Kikkawa
- Department of Clinical Biochemistry, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan.
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12
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Diaz-Lombana N, Diaz-Ordoñez L, Gutierrez-Medina JD, Pachajoa H. Case report: Novel frameshift mutation in LAMA2 gene causing congenital muscular dystrophy type 1A. Front Genet 2023; 14:1158350. [PMID: 37415604 PMCID: PMC10319579 DOI: 10.3389/fgene.2023.1158350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 06/06/2023] [Indexed: 07/08/2023] Open
Abstract
Congenital muscular dystrophy type 1A (CMD1A) is a rare autosomal recessive disorder caused by mutations in the LAMA2 gene. CMD1A is characterized by peripheral hypotonia and muscle weakness from the first months of life, cerebral white matter abnormalities, and elevated creatine phosphokinase (CPK) levels. We describe an 8-year-old girl from Colombia with clinical features compatible with CMD1A, severe scoliosis corrected with surgery, and feeding difficulty corrected with a gastrostomy. Whole-exome sequencing identified two heterozygous variants: a reported nonsense variant (LAMA2 NM_000426.3:c.4198C>T) and a novel likely pathogenic variant (LAMA2 NM_000426.3:c.9227_9243dup). This is the first genetically confirmed case of CMD1A in Colombia and the first report of the c.9227_9243dup variant causing CMD1A.
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Affiliation(s)
- Natalia Diaz-Lombana
- Centro de Investigaciones en Anomalías Congénitas y Enfermedades Raras (CIACER), Universidad Icesi, Cali, Colombia
| | - Lorena Diaz-Ordoñez
- Centro de Investigaciones en Anomalías Congénitas y Enfermedades Raras (CIACER), Universidad Icesi, Cali, Colombia
- Departamento de Ciencias Básicas Médicas, Facultad de Salud, Universidad Icesi, Cali, Colombia
| | - Juan David Gutierrez-Medina
- Centro de Investigaciones en Anomalías Congénitas y Enfermedades Raras (CIACER), Universidad Icesi, Cali, Colombia
- Centro de Investigaciones Clínicas, Fundación Valle del Lili, Cali, Colombia
| | - Harry Pachajoa
- Centro de Investigaciones en Anomalías Congénitas y Enfermedades Raras (CIACER), Universidad Icesi, Cali, Colombia
- Departamento de Ciencias Básicas Médicas, Facultad de Salud, Universidad Icesi, Cali, Colombia
- Genetic Division, Fundación Valle del Lili, Cali, Colombia
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13
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Xu Y, Zhu L, Qian Y, Dong M. Limb girdle muscular dystrophy 23 caused by compound heterozygous mutations of LAMA2 gene. Front Pediatr 2023; 11:1191068. [PMID: 37404563 PMCID: PMC10316388 DOI: 10.3389/fped.2023.1191068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 06/05/2023] [Indexed: 07/06/2023] Open
Abstract
Introduction Mutations of LAMA2 gene are associated with congenital muscular dystrophy (CMD). The LAMA2-related CMD mainly consists of two diseases, merosin deficient congenital muscular dystrophies type 1A (MDC1A) and limb girdle muscular dystrophy 23 (LGMD23). LGMD23 is characterized by slowly progressive proximal muscle weakness, which primarily affects the lower limbs and results in gait difficulties. Additional clinical features include increased serum creatine kinase, abnormal electromyography with or without white matter abnormalities on brain imaging. Methods Clinical data were collected from a Chinese Han family. Whole-exome sequencing, Sanger sequencing, RT-PCR and TA clone sequencing were performed on the family members. Results Compound heterozygous mutations of LAMA2: c.1693C > T (p. Q565*) (maternally inherited) and c.9212-6T > G (paternally inherited) were identified and confirmed in the proband. The mutation c.1693C > T (p. Q565*) was classified as pathogenic according to American College of Medical Genetics and Genomics (ACMG) guidelines. By performing RT-PCR and TA clone sequencing, an insertion of 40-bp intronic sequence (intron 64) was found in the transcripts of the proband and her father, which resulted in a frameshift and premature truncation codon of the LAMA2. In particular, the variant truncated the LamG domain of the LAMA2. Therefore, the c.9212-6T>G was classified as likely pathogenic according to American College of Medical Genetics and Genomics (ACMG) guidelines. Discussion Our findings described two novel mutations in a girl with LGMDR23, which contributes to the genetic counseling of the family and expands the clinical and molecular spectrums of the rare disease.
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Affiliation(s)
- Yuqing Xu
- Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Key Laboratory of Reproductive Genetics, Ministry of Education (Zhejiang University), Hangzhou, China
| | - Linyan Zhu
- Department of Obstetrics and Gynaecology, Ningbo First Hospital, Ningbo, China
| | - Yeqing Qian
- Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Key Laboratory of Reproductive Genetics, Ministry of Education (Zhejiang University), Hangzhou, China
| | - Minyue Dong
- Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Key Laboratory of Reproductive Genetics, Ministry of Education (Zhejiang University), Hangzhou, China
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Tran VK, Nguyen NL, Tran LNT, Le PT, Tran AH, Pham TLA, Lien NTK, Xuan NT, Thanh LT, Ta TV, Tran TH, Nguyen HH. Merosin-deficient congenital muscular dystrophy type 1a: detection of LAMA2 variants in Vietnamese patients. Front Genet 2023; 14:1183663. [PMID: 37388928 PMCID: PMC10301838 DOI: 10.3389/fgene.2023.1183663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 06/06/2023] [Indexed: 07/01/2023] Open
Abstract
Background: Merosin-deficient congenital muscular dystrophy type 1A (MDC1A), also known as laminin-α2 chain-deficient congenital muscular dystrophy (LAMA2-MD), is an autosomal recessive disease caused by biallelic variants in the LAMA2 gene. In MDC1A, laminin- α2 chain expression is absent or significantly reduced, leading to some early-onset clinical symptoms including severe hypotonia, muscle weakness, skeletal deformity, non-ambulation, and respiratory insufficiency. Methods: Six patients from five unrelated Vietnamese families presenting with congenital muscular dystrophy were investigated. Targeted sequencing was performed in the five probands. Sanger sequencing was carried out in their families. Multiplex ligation-dependent probe amplification was performed in one family to examine an exon deletion. Results: Seven variants of the LAMA2 (NM_000426) gene were identified and classified as pathogenic/likely pathogenic variants using American College of Medical Genetics and Genomics criteria. Two of these variants were not reported in the literature, including c.7156-5_7157delinsT and c.8974_8975insTGAT. Sanger sequencing indicated their parents as carriers. The mothers of family 4 and family 5 were pregnant and a prenatal testing was performed. The results showed that the fetus of the family 4 only carries c.4717 + 5G>A in the heterozygous form, while the fetus of the family 5 carries compound heterozygous variants, including a deletion of exon 3 and c.4644C>A. Conclusion: Our findings not only identified the underlying genetic etiology for the patients, but also provided genetic counseling for the parents whenever they have an offspring.
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Affiliation(s)
- Van Khanh Tran
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
| | - Ngoc-Lan Nguyen
- Institute of Genome Research, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Lan Ngoc Thi Tran
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
| | - Phuong Thi Le
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
| | - Anh Hai Tran
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
| | - Tuan L. A. Pham
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
| | - Nguyen Thi Kim Lien
- Institute of Genome Research, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Nguyen Thi Xuan
- Institute of Genome Research, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Le Tat Thanh
- Institute of Genome Research, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Thanh Van Ta
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
- Hanoi Medical University Hospital, Hanoi Medical University, Hanoi, Vietnam
| | - Thinh Huy Tran
- Center for Gene and Protein Research, Hanoi Medical University, Hanoi, Vietnam
- Hanoi Medical University Hospital, Hanoi Medical University, Hanoi, Vietnam
| | - Huy-Hoang Nguyen
- Institute of Genome Research, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
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15
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Camelo CG, Artilheiro MC, Martins Moreno CA, Ferraciolli SF, Serafim Silva AM, Fernandes TR, Lucato LT, Rocha AJ, Reed UC, Zanoteli E. Brain MRI Abnormalities, Epilepsy and Intellectual Disability in LAMA2 Related Dystrophy - a Genotype/Phenotype Correlation. J Neuromuscul Dis 2023:JND221638. [PMID: 37182895 DOI: 10.3233/jnd-221638] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
BACKGROUND LAMA2-related muscular dystrophy is a disorder that causes muscle weakness and varies in severity, from a severe, congenital type to a milder, late-onset form. However, the disease does not only affect the muscles, but has systemic involvement and can lead to alterations such as brain malformation, epilepsy and intellectual disability. OBJECTIVE Describe the frequency of cortical malformations, epilepsy and intellectual disability in LAMA2-RD in a Brazilian cohort and correlate the neurological findings to genetic and motor function. METHODS This is an observational study of 52 LAMA2-RD patients, who were divided into motor function subgroups and compared based on brain MRI findings, epilepsy, intellectual disability, and type of variants and variant domains. RESULTS 44 patients (84.6%) were only able to sit, and 8 patients (15.4%) were able to walk. 10 patients (19.2%) presented with cortical malformations (polymicrogyria, lissencephaly-pachygyria, and cobblestone),10 patients (19.2%) presented with epilepsy, and 8 (15.4%) had intellectual disability. CNS manifestations correlated with a more severe motor phenotype and none of the patients able to walk presented with cortical malformation or epilepsy. There was a relation between gene variants affecting the laminin-α2 LG-domain and the presence of brain malformation (P = 0.016). There was also a relation between the presence of null variants and central nervous system involvement. A new brazilian possible founder variant was found in 11 patients (21,15%) (c.1255del; p. Ile419Leufs *4). CONCLUSION Cortical malformations, epilepsy and intellectual disability are more frequent among LAMA2-RD patients than previously reported and correlate with motor function severity and the presence of variants affecting the laminin-α2 LG domain. This brings more insight fore phenotype-genotype correlations, shows the importance of reviewing the brain MRI of patients with LAMA2-RD and allows greater attention to the risk of brain malformation, epilepsy, and intellectual disability in those patients with variants that affect the LG domain.
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Affiliation(s)
- Clara Gontijo Camelo
- Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | | | | | - Sueli Fazio Ferraciolli
- Department of Radiology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - André Macedo Serafim Silva
- Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - Tatiana Ribeiro Fernandes
- Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - Leandro Tavares Lucato
- Department of Radiology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - Antônio José Rocha
- Department of Radiology, Faculdade de Medicina da Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Umbertina Conti Reed
- Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - Edmar Zanoteli
- Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
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16
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Washington C, Stolerman ES, Cooley‐Coleman JA, Jones JR, Chen‐Deutsch X. RNA analysis of intronic variants in the LAMA2 gene detected by whole genome sequencing confirms a rare dual diagnosis of incontinentia pigmenti with limb-girdle muscular dystrophy. Clin Case Rep 2023; 11:e7165. [PMID: 37038535 PMCID: PMC10082350 DOI: 10.1002/ccr3.7165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/03/2023] [Accepted: 03/14/2023] [Indexed: 04/12/2023] Open
Abstract
We see that a multiple methods approach to diagnosis remains necessary in the era of whole genome sequencing. We also observe that reproductive risk genetic counseling can be a motivating factor for further testing along the diagnostic odyssey.
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17
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McKee KK, Yurchenco PD. Dual transgene amelioration of Lama2-null muscular dystrophy. Matrix Biol 2023; 118:1-15. [PMID: 36878377 PMCID: PMC10771811 DOI: 10.1016/j.matbio.2023.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/14/2023] [Accepted: 03/02/2023] [Indexed: 03/07/2023]
Abstract
Null mutations of the Lama2-gene cause a severe congenital muscular dystrophy and associated neuropathy. In the absence of laminin-α2 (Lmα2) there is a compensatory replacement by Lmα4, a subunit that lacks the polymerization and α-dystroglycan (αDG)-binding properties of Lmα2. The dystrophic phenotype in the dy3K/dy3K Lama2-/- mouse were evaluated with transgenes driving expression of two synthetic laminin-binding linker proteins. Transgenic muscle-specific expression of αLNNd, a chimeric protein that enables α4-laminin polymerization, and miniagrin (mag), a protein that increases laminin binding to the receptor αDG, separately improved median mouse survival two-fold. The double transgenes (DT) improved mean survival three-fold with increases in overall body weight, muscle size, and grip strength, but, given absence of neuronal expression, did not prevent hindlimb paresis. Muscle improvements included increased myofiber size and number and reduced fibrosis. Myofiber hypertrophy with increased mTOR and Akt phosphorylation were characteristics of mag-dy3K/dy3K and DT-dy3K/dy3K muscle. Elevations of matrix-bound α4-, β1 and γ1 laminin subunits were detected in muscle extracts and immunostained sections in response to DT expression. Collectively, these findings reveal a complimentary polymerization and αDG-binding benefit to Lama2-/- mouse muscle largely mediated through modified laminin-411.
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Affiliation(s)
- Karen K McKee
- Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, USA
| | - Peter D Yurchenco
- Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, USA.
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18
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Lake NJ, Phua J, Liu W, Moors T, Axon S, Lek M. Estimating the Prevalence of LAMA2 Congenital Muscular Dystrophy using Population Genetic Databases. J Neuromuscul Dis 2023; 10:381-387. [PMID: 37005889 DOI: 10.3233/jnd-221552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Background: Recessive pathogenic variants in LAMA2 resulting in complete or partial loss of laminin α2 protein cause congenital muscular dystrophy (LAMA2 CMD). The prevalence of LAMA2 CMD has been estimated by epidemiological studies to lie between 1.36–20 cases per million. However, prevalence estimates from epidemiological studies are vulnerable to inaccuracies owing to challenges with studying rare diseases. Population genetic databases offer an alternative method for estimating prevalence. Objective: We aim to use population allele frequency data for reported and predicted pathogenic variants to estimate the birth prevalence of LAMA2 CMD. Methods: A list of reported pathogenic LAMA2 variants was compiled from public databases, and supplemented with predicted loss of function (LoF) variants in the Genome Aggregation Database (gnomAD). gnomAD allele frequencies for 273 reported pathogenic and predicted LoF LAMA2 variants were used to calculate disease prevalence using a Bayesian methodology. Results: The world-wide birth prevalence of LAMA2 CMD was estimated to be 8.3 per million (95% confidence interval (CI) 6.27 –10.5 per million). The prevalence estimates for each population in gnomAD varied, ranging from 1.79 per million in East Asians (95% CI 0.63 –3.36) to 10.1 per million in Europeans (95% CI 6.74 –13.9). These estimates were generally consistent with those from epidemiological studies, where available. Conclusions: We provide robust world-wide and population-specific birth prevalence estimates for LAMA2 CMD, including for non-European populations in which LAMA2 CMD prevalence hadn’t been studied. This work will inform the design and prioritization of clinical trials for promising LAMA2 CMD treatments.
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Affiliation(s)
- Nicole J. Lake
- Yale School of Medicine, New Haven, CT, USA
- Murdoch Children’s Research Institute, Melbourne, VIC, Australia
| | - Joel Phua
- Masters Program in Biotechnology, UCSI University, Kuala Lumpur, Malaysia
| | - Wei Liu
- Program of Computational Biology and Bioinformatics, Yale University, New Haven, CT, USA
| | | | | | - Monkol Lek
- Yale School of Medicine, New Haven, CT, USA
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19
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Sumalde AAM, Scholes MA, Kalmanson OA, Terhune EA, Frejo L, Wethey CI, Roman-Naranjo P, Carry PM, Gubbels SP, Lopez-Escamez JA, Hadley-Miller N, Santos-Cortez RLP. Rare Coding Variants in Patients with Non-Syndromic Vestibular Dysfunction. Genes (Basel) 2023; 14:831. [PMID: 37107589 PMCID: PMC10137884 DOI: 10.3390/genes14040831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/25/2023] [Accepted: 03/27/2023] [Indexed: 04/29/2023] Open
Abstract
Vertigo due to vestibular dysfunction is rare in children. The elucidation of its etiology will improve clinical management and the quality of life of patients. Genes for vestibular dysfunction were previously identified in patients with both hearing loss and vertigo. This study aimed to identify rare, coding variants in children with peripheral vertigo but no hearing loss, and in patients with potentially overlapping phenotypes, namely, Meniere's disease or idiopathic scoliosis. Rare variants were selected from the exome sequence data of 5 American children with vertigo, 226 Spanish patients with Meniere's disease, and 38 European-American probands with scoliosis. In children with vertigo, 17 variants were found in 15 genes involved in migraine, musculoskeletal phenotypes, and vestibular development. Three genes, OTOP1, HMX3, and LAMA2, have knockout mouse models for vestibular dysfunction. Moreover, HMX3 and LAMA2 were expressed in human vestibular tissues. Rare variants within ECM1, OTOP1, and OTOP2 were each identified in three adult patients with Meniere's disease. Additionally, an OTOP1 variant was identified in 11 adolescents with lateral semicircular canal asymmetry, 10 of whom have scoliosis. We hypothesize that peripheral vestibular dysfunction in children may be due to multiple rare variants within genes that are involved in the inner ear structure, migraine, and musculoskeletal disease.
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Affiliation(s)
- Angelo Augusto M. Sumalde
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Department of Otolaryngology-Head and Neck Surgery, University of the Philippines Manila College of Medicine, Philippine General Hospital, Manila 1000, Philippines
| | - Melissa A. Scholes
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Department of Pediatric Otolaryngology, Children’s Hospital Colorado, Aurora, CO 80045, USA
- Department of Otolaryngology-Head and Neck Surgery, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Olivia A. Kalmanson
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Elizabeth A. Terhune
- Department of Orthopedics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Lidia Frejo
- Otology and Neurotology Group CTS495, Department of Genomic Medicine, GENYO-Centre for Genomics and Oncological Research-Pfizer-University of Granada-Junta de Andalucia, PTS, 18016 Granada, Spain
- Division of Otolaryngology, Department of Surgery, Instituto de Investigación Biosanitaria, ibs.GRANADA, Universidad de Granada, 18071 Granada, Spain
| | - Cambria I. Wethey
- Department of Orthopedics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Pablo Roman-Naranjo
- Otology and Neurotology Group CTS495, Department of Genomic Medicine, GENYO-Centre for Genomics and Oncological Research-Pfizer-University of Granada-Junta de Andalucia, PTS, 18016 Granada, Spain
- Division of Otolaryngology, Department of Surgery, Instituto de Investigación Biosanitaria, ibs.GRANADA, Universidad de Granada, 18071 Granada, Spain
| | - Patrick M. Carry
- Department of Orthopedics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Musculoskeletal Research Center, Children’s Hospital Colorado, Aurora, CO 80045, USA
| | - Samuel P. Gubbels
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Jose A. Lopez-Escamez
- Otology and Neurotology Group CTS495, Department of Genomic Medicine, GENYO-Centre for Genomics and Oncological Research-Pfizer-University of Granada-Junta de Andalucia, PTS, 18016 Granada, Spain
- Division of Otolaryngology, Department of Surgery, Instituto de Investigación Biosanitaria, ibs.GRANADA, Universidad de Granada, 18071 Granada, Spain
- Meniere’s Disease Neuroscience Research Program, Faculty of Medicine & Health, School of Medical Sciences, The Kolling Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - Nancy Hadley-Miller
- Department of Orthopedics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Musculoskeletal Research Center, Children’s Hospital Colorado, Aurora, CO 80045, USA
| | - Regie Lyn P. Santos-Cortez
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Center for Children’s Surgery, Children’s Hospital Colorado, Aurora, CO 80045, USA
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20
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Arockiaraj AI, Johnson MA, Munir A, Ekambaram P, Lucas PC, McAllister-Lucas LM, Kemaladewi DU. CRISPRa-induced upregulation of human LAMA1 compensates for LAMA2-deficiency in Merosin-deficient congenital muscular dystrophy. bioRxiv 2023:2023.03.06.531347. [PMID: 36945402 PMCID: PMC10028808 DOI: 10.1101/2023.03.06.531347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
Merosin-deficient congenital muscular dystrophy (MDC1A) is an autosomal recessive disorder caused by mutations in the LAMA2 gene, resulting in a defective form of the extracellular matrix protein laminin-α2 (LAMA2). Individuals diagnosed with MDC1A exhibit progressive muscle wasting and declining neuromuscular functions. No treatments for this disorder are currently available. We previously showed that postnatal Lama1 upregulation, achieved through CRISPR activation (CRISPRa), compensates for Lama2 deficiency and prevents neuromuscular pathophysiology in a mouse model of MDC1A. In this study, we assessed the feasibility of upregulating human LAMA1 as a potential therapeutic strategy for individuals with MDC1A, regardless of their mutations. We hypothesized that CRISPRa-mediated upregulation of human LAMA1 would compensate for the lack of LAMA2 and rescue cellular abnormalities in MDC1A fibroblasts. Global transcriptomic and pathway enrichment analyses of fibroblasts collected from individuals carrying pathogenic LAMA2 mutations, compared with healthy controls, indicated higher expression of transcripts encoding proteins that contribute to wound healing, including Transforming Growth Factor-β (TGF-β) and Fibroblast Growth Factor (FGF). These findings were supported by wound-healing assays indicating that MDC1A fibroblasts migrated significantly more rapidly than the controls. Subsequently, we treated the MDC1A fibroblasts with SadCas9-2XVP64 and sgRNAs targeting the LAMA1 promoter. We observed robust LAMA1 expression, which was accompanied by significant decreases in cell migration and expression of FGFR2, TGF-β2, and ACTA2, which are involved in the wound-healing mechanism in MDC1A fibroblasts. Collectively, our data suggest that CRISPRa-mediated LAMA1 upregulation may be a feasible mutation-independent therapeutic approach for MDC1A. This strategy might be adapted to address other neuromuscular diseases and inherited conditions in which strong compensatory mechanisms have been identified.
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Affiliation(s)
- Annie I. Arockiaraj
- Department of Human Genetics, School of Public Health, University of Pittsburgh, Pittsburgh, USA
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, USA
| | - Marie A. Johnson
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, USA
| | - Anushe Munir
- Department of Human Genetics, School of Public Health, University of Pittsburgh, Pittsburgh, USA
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, USA
| | - Prasanna Ekambaram
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, USA
| | - Peter C. Lucas
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, USA
| | | | - Dwi U. Kemaladewi
- Department of Human Genetics, School of Public Health, University of Pittsburgh, Pittsburgh, USA
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, USA
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21
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Wang DZ, Li BH, Ma Q, Yu Z, Chen K, He Y, Tan S. Novel compound heterozygous mutations of LAMA2-limb-girdle muscular dystrophy: A case report and literature review. Front Neurol 2023; 14:1078151. [PMID: 36860576 PMCID: PMC9968920 DOI: 10.3389/fneur.2023.1078151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 01/24/2023] [Indexed: 02/16/2023] Open
Abstract
The laminin α2 (LAMA2) gene pathogenic variants can lead to limb-girdle muscular dystrophy (known as LGMDR23), which is rarely reported and characterized by proximal weakness in the limbs. We present the case of a 52-year-old woman who gradually developed weakness in both lower extremities since the age of 32 years. Magnetic resonance imaging (MRI) brain showed symmetrical sphenoid wings-like white matter demyelination in bilateral lateral ventricles. Electromyography showed quadriceps muscle damage on the bilateral lower extremity. Next-generation sequencing (NGS) found two loci variations in the LAMA2 gene, i.e., c.2749 + 2dup and c.8689C>T. This case highlights the importance of considering LGMDR23 in patients presenting with weakness and white matter demyelination on MRI brain and further expands the gene variants spectrum of LGMDR23.
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Affiliation(s)
- Duo-Zi Wang
- Department of Neurology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Bing-Hu Li
- Department of Neurology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Qiong Ma
- Department of Neurology, The First People's Hospital of Liangshan in Yi Autonomous Prefecture, Xichang, China
| | - Zhou Yu
- Department of Psychosomatic Medicine, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Kai Chen
- Department of Neurology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Ying He
- Department of Psychosomatic Medicine, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Song Tan
- Department of Neurology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China,Sichuan Provincial Key Laboratory for Human Disease Gene Study, Chengdu, China,Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, Chengdu, Sichuan, China,*Correspondence: Song Tan ✉
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22
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Katz M, Waddell LB, Yuen M, Bryen SJ, Oates E, Garton FC, Robertson T, Henderson RD, Cooper ST, McCombe PA. Case report: Adult-onset limb girdle muscular dystrophy in sibling pair due to novel homozygous LAMA2 missense variant. Front Neurol 2023; 14:1055639. [PMID: 36779065 PMCID: PMC9911805 DOI: 10.3389/fneur.2023.1055639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 01/12/2023] [Indexed: 01/28/2023] Open
Abstract
Recessive pathogenic variants in the laminin subunit alpha 2 (LAMA2) gene cause a spectrum of disease ranging from severe congenital muscular dystrophy to later-onset limb girdle muscular dystrophy (LGMDR23). The phenotype of LGMDR23 is characterized by slowly progressive proximal limb weakness, contractures, raised creatine kinase, and sometimes distinctive cerebral white matter changes and/or epilepsy. We present two siblings, born to consanguineous parents, who developed adult-onset LGMDR23 associated with typical cerebral white matter changes and who both later developed dementia. The male proband also had epilepsy and upper motor neuron signs when he presented at age 72. Merosin immunohistochemistry and Western blot on muscle biopsies taken from both subjects was normal. Whole exome sequencing revealed a previously unreported homozygous missense variant in LAMA2 [Chr6(GRCh38):g.129297734G>A; NM_000426.3:c.2906G>A; p.(Cys969Tyr)] in the proband. The same homozygous LAMA2 variant was confirmed by Sanger sequencing in the proband's affected sister. These findings expand the genotypic and phenotypic spectrum of LGMDR23.
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Affiliation(s)
- Matthew Katz
- Department of Neurology, Royal Brisbane and Women's Hospital, Herston, QLD, Australia,*Correspondence: Matthew Katz ✉
| | - Leigh B. Waddell
- Kids Research, Kids Neuroscience Centre, The Children's Hospital at Westmead, Sydney, NSW, Australia,Discipline of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Michaela Yuen
- Kids Research, Kids Neuroscience Centre, The Children's Hospital at Westmead, Sydney, NSW, Australia,Discipline of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Samantha J. Bryen
- Kids Research, Kids Neuroscience Centre, The Children's Hospital at Westmead, Sydney, NSW, Australia,Discipline of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Emily Oates
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Fleur C. Garton
- Institute for Molecular Biosciences, The University of Queensland, St Lucia, QLD, Australia
| | - Thomas Robertson
- Department of Pathology, Royal Brisbane and Women's Hospital, Herston, QLD, Australia,School of Biomedical Sciences, The University of Queensland, St Lucia, QLD, Australia
| | | | - Sandra T. Cooper
- Kids Research, Kids Neuroscience Centre, The Children's Hospital at Westmead, Sydney, NSW, Australia,Discipline of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia,The Children's Medical Research Institute, Sydney, NSW, Australia
| | - Pamela A. McCombe
- Department of Neurology, Royal Brisbane and Women's Hospital, Herston, QLD, Australia,Centre for Clinical Research, The University of Queensland, Herston, QLD, Australia
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23
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Stojkovic T, Masingue M, Métay C, Romero NB, Eymard B, Ben Yaou R, Rialland L, Drunat S, Gartioux C, Nelson I, Allamand V, Bonne G, Villar-Quiles RN. LAMA2-Related Muscular Dystrophy: The Importance of Accurate Phenotyping and Brain Imaging in the Diagnosis of LGMD. J Neuromuscul Dis 2023; 10:125-133. [PMID: 36373293 DOI: 10.3233/jnd-221555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We report three siblings from a non-consanguineous family presenting with contractural limb-girdle phenotype with intrafamilial variability. Muscle MRI showed posterior thigh and quadriceps involvement with a sandwich-like sign. Whole-exome sequencing identified two compound heterozygous missense TTN variants and one heterozygous LAMA2 variant. Brain MRI performed because of concentration difficulties in one of the siblings evidenced white-matter abnormalities, subsequently found in the others. The genetic analysis was re-oriented, revealing a novel pathogenic intronic LAMA2 variant which confirmed the LAMA2-RD diagnosis. This work highlights the importance of a thorough clinical phenotyping and the importance of brain imaging, in order to orientate and interpret the genetic analysis.
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Affiliation(s)
- Tanya Stojkovic
- APHP, Reference Center for Neuromuscular Disorders, Institut de Myologie, Pitié-Salpêtrière Hospital, Paris, France.,INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
| | - Marion Masingue
- APHP, Reference Center for Neuromuscular Disorders, Institut de Myologie, Pitié-Salpêtrière Hospital, Paris, France
| | - Corinne Métay
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France.,AP-HP, Centre de Génétique Moléculaire et Chromosomique, UF Cardiomyogénétique et Myogénétique Moléculaire et Cellulaire, Pitié-Salpêtrière Hospital, Paris, France
| | - Norma B Romero
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France.,Neuromuscular Morphology Unit, Institut de Myologie, APHP, Pitié-Salpêtrière Hospital, Paris, France
| | - Bruno Eymard
- APHP, Reference Center for Neuromuscular Disorders, Institut de Myologie, Pitié-Salpêtrière Hospital, Paris, France
| | - Rabah Ben Yaou
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
| | - Laetitia Rialland
- AP-HP, Centre de Génétique Moléculaire et Chromosomique, UF Cardiomyogénétique et Myogénétique Moléculaire et Cellulaire, Pitié-Salpêtrière Hospital, Paris, France
| | - Séverine Drunat
- Département de génétique, Hôpital Universitaire Robert Debré, Paris, France
| | - Corine Gartioux
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
| | - Isabelle Nelson
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
| | - Valérie Allamand
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
| | - Gisèle Bonne
- INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
| | - Rocio Nur Villar-Quiles
- APHP, Reference Center for Neuromuscular Disorders, Institut de Myologie, Pitié-Salpêtrière Hospital, Paris, France.,INSERM, Institut de Myologie, Centre de Recherche en Myologie, Sorbonne Université, Paris, France
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24
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Huang X, Tan D, Zhang Z, Ge L, Liu J, Ding J, Yang H, Wei C, Chang X, Yuan Y, Yan C, Xiong H. Unique genotype-phenotype correlations within LAMA2-related limb girdle muscular dystrophy in Chinese patients. Front Neurol 2023; 14:1158094. [PMID: 37206914 PMCID: PMC10190595 DOI: 10.3389/fneur.2023.1158094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 03/21/2023] [Indexed: 05/21/2023] Open
Abstract
Background LAMA2-related limb girdle muscular dystrophy (LGMD R23) is rare. The detailed clinical phenotypes and genetic information associated with LGMD R23 are unknown. Methods We conducted a retrospective cross-sectional and longitudinal study on 19 LGMD R23 patients. Results Normal early motor development was observed in 84.2% patients. Mild orthopedic complications were observed in 42.1% patients. 36.8% patients had seizures, which is unusually frequent in LGMD. Epilepsy was eventually diagnosed in 26.3% patients. 46.7% patients presented with motor neuropathy. Genetic analysis identified 29 pathogenic variants, with missense and frameshift variants being the most common. The mutant sites were mainly distributed in the N-terminal and G-like domains of laminin. The missense variants are distributed near the N-terminus (exons 3-11), whereas frameshift variants are distributed in exons 12-65. Five patients were diagnosed with epilepsy and all of them harbor at least one missense variants in exon 4. 71.4% variants of patients with motor neuropathy located in the LN domain. Conclusions Missense variants in exon 4 maybe correlated with epilepsy and variants in the LN domain maybe correlated with motor neuropathy in Chinese patients. Our study expands the clinical and genetic spectrum caused by LAMA2 variations and provides novel genotype-phenotype correlations of LGMD R23.
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Affiliation(s)
- Xiuli Huang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Dandan Tan
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Zaiqiang Zhang
- Department of Neurology, China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Lin Ge
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Jieyu Liu
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Juan Ding
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Haipo Yang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Cuijie Wei
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Xingzhi Chang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Yun Yuan
- Department of Neurology, Peking University First Hospital, Beijing, China
| | - Chuanzhu Yan
- Department of Neurology, Research Institute of Neuromuscular and Neurodegenerative Disease, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Hui Xiong
- Department of Pediatrics, Peking University First Hospital, Beijing, China
- Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Beijing, China
- *Correspondence: Hui Xiong
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25
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Bencze M. Mechanisms of Myofibre Death in Muscular Dystrophies: The Emergence of the Regulated Forms of Necrosis in Myology. Int J Mol Sci 2022; 24:ijms24010362. [PMID: 36613804 PMCID: PMC9820579 DOI: 10.3390/ijms24010362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 12/28/2022] Open
Abstract
Myofibre necrosis is a central pathogenic process in muscular dystrophies (MD). As post-lesional regeneration cannot fully compensate for chronic myofibre loss, interstitial tissue accumulates and impairs muscle function. Muscle regeneration has been extensively studied over the last decades, however, the pathway(s) controlling muscle necrosis remains largely unknown. The recent discovery of several regulated cell death (RCD) pathways with necrotic morphology challenged the dogma of necrosis as an uncontrolled process, opening interesting perspectives for many degenerative disorders. In this review, we focus on how cell death affects myofibres in MDs, integrating the latest research in the cell death field, with specific emphasis on Duchenne muscular dystrophy, the best-known and most common hereditary MD. The role of regulated forms of necrosis in myology is still in its infancy but there is increasing evidence that necroptosis, a genetically programmed form of necrosis, is involved in muscle degenerating disorders. The existence of apoptosis in myofibre demise will be questioned, while other forms of non-apoptotic RCDs may also have a role in myonecrosis, illustrating the complexity and possibly the heterogeneity of the cell death pathways in muscle degenerating conditions.
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Affiliation(s)
- Maximilien Bencze
- “Biology of the Neuromuscular System” Team, Institut Mondor de Recherche Biomédicale (IMRB), University Paris-Est Créteil, INSERM, U955 IMRB, 94010 Créteil, France;
- École Nationale Vétérinaire d’Alfort, IMRB, 94700 Maisons-Alfort, France
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Rui Q, Tan J, Jin J, Ye W, Zhou Y, Chen J. Establishment of a PBMC-derived induced pluripotent stem cell (NJUCMi001-A) from a patient with LAMA2-related congenital muscular dystrophy (MDC1A) carrying frameshift deletion c.3367delA in LAMA2 gene. Stem Cell Res 2022; 65:102957. [PMID: 36334577 DOI: 10.1016/j.scr.2022.102957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/10/2022] [Accepted: 10/29/2022] [Indexed: 11/07/2022] Open
Abstract
LAMA2-related congenital muscular dystrophy (MDC1A), the most commonly recognized type of congenital muscular dystrophies, is a severe neonatal onset muscle disease caused by recessive mutations in the LAMA2 gene. Here, we established an induced pluripotent stem cell line from a MDC1A patient carrying a frameshift deletion c.3367delA in LAMA2 gene. The iPSC line expressed pluripotency markers, retained normal karyotype, showed capability of differentiating into three germ layers. The iPSC line will help to further elucidate the pathogenic mechanisms of LAMA2 mutation, and benefit treatment for congenital muscular dystrophies in the future.
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Mianesaz H, Ghalamkari S, Salehi M, Behnam M, Hosseinzadeh M, Basiri K, Ghasemi M, Sedghi M, Ansari B. Causative variants linked with limb girdle muscular dystrophy in an Iranian population: 6 novel variants. Mol Genet Genomic Med 2022; 11:e2101. [PMID: 36374152 PMCID: PMC9938754 DOI: 10.1002/mgg3.2101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 10/03/2022] [Accepted: 11/03/2022] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Limb-girdle muscular dystrophy (LGMD) is a non-syndromic muscular dystrophy caused by variations in the genes involved in muscle structure, function and repair. The heterogeneity in the severity, progression, age of onset, and causative genes makes next-generation sequencing (NGS) a necessary approach for the proper diagnosis of LGMD. METHODS In this article, 26 Iranian patients with LGMD criteria were diagnosed with disease variants in the genes encoding calpain3, dysferlin, sarcoglycans and Laminin α-2. Patients were referred to the hospital with variable distribution of muscle wasting and progressive weakness in the body. The symptoms along with biochemical and EMG tests were suggestive of LGMD; thus the genomic DNA of patients were investigated by whole-exome sequencing including flanking intronic regions. The target genes were explored for the disease-causing variants. Moreover, the consequence of the amino acid alterations on proteins' secondary structure and function was investigated for a better understanding of the pathogenicity of variants. Variants were sorted based on the genomic region, type and clinical significance. RESULTS In a comprehensive investigation of previous clinical records, 6 variations were determined as novel, including c.1354-2 A > T and c.3169_3172dupCGGC in DYSF, c.568 G > T in SGCD, c.7243 C > T, c.8662_8663 insT and c. 4397G > C in LAMA2. Some of the detected variants were located in functional domains and/or near to the post-translational modification sites, altering or removing highly conserved regions of amino acid sequence.
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Affiliation(s)
- Hamidreza Mianesaz
- Department of Human Genetics, Medical SchoolUniversity of DebrecenDebrecenHungary,Department of Genetics and Molecular BiologyIsfahan University of Medical SciencesIsfahanIran
| | - Safoura Ghalamkari
- Department of Genetics and Molecular BiologyIsfahan University of Medical SciencesIsfahanIran,Division of Clinical Genetics, Department of Laboratory Medicine, Faculty of MedicineUniversity of DebrecenDebrecenHungary
| | - Mansoor Salehi
- Department of Genetics and Molecular BiologyIsfahan University of Medical SciencesIsfahanIran,Cellular, Molecular and Genetics Research CenterIsfahan University of Medical SciencesIsfahanIran
| | - Mahdiyeh Behnam
- Cellular, Molecular and Genetics Research CenterIsfahan University of Medical SciencesIsfahanIran,Student Research CommitteeSemnan University of Medical ScienceSemnanIran
| | - Majid Hosseinzadeh
- Department of Genetics and Molecular BiologyIsfahan University of Medical SciencesIsfahanIran,Medical Genetics Laboratory, Alzahra University HospitalIsfahan University of Medical SciencesIsfahanIran
| | - Keivan Basiri
- Metabolic Disorders Research Center, Endocrinology and Metabolism Molecular‐Cellular Sciences InstituteTehran University of Medical ScienceTehranIran,Department of NeurologyIsfahan University of Medical SciencesIsfahanIran
| | - Majid Ghasemi
- Metabolic Disorders Research Center, Endocrinology and Metabolism Molecular‐Cellular Sciences InstituteTehran University of Medical ScienceTehranIran,Department of NeurologyIsfahan University of Medical SciencesIsfahanIran
| | - Maryam Sedghi
- Medical Genetics Laboratory, Alzahra University HospitalIsfahan University of Medical SciencesIsfahanIran,Metabolic Disorders Research Center, Endocrinology and Metabolism Molecular‐Cellular Sciences InstituteTehran University of Medical ScienceTehranIran
| | - Behnaz Ansari
- Department of NeurologyIsfahan University of Medical SciencesIsfahanIran,Isfahan Neuroscience Research Center, ALzahra Research InstituteIsfahan University of Medical ScienceIsfahanIran
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Erdman VV, Karimov DD, Tuktarova IA, Timasheva YR, Nasibullin TR, Korytina GF. Alu Deletions in LAMA2 and CDH4 Genes Are Key Components of Polygenic Predictors of Longevity. Int J Mol Sci 2022; 23:13492. [PMID: 36362280 PMCID: PMC9657309 DOI: 10.3390/ijms232113492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 10/18/2023] Open
Abstract
Longevity is a unique human phenomenon and a highly stable trait, characterized by polygenicity. The longevity phenotype occurs due to the ability to successfully withstand the age-related genomic instability triggered by Alu elements. The purpose of our cross-sectional study was to evaluate the combined contribution of ACE*Ya5ACE, CDH4*Yb8NBC516, COL13A1*Ya5ac1986, HECW1*Ya5NBC182, LAMA2*Ya5-MLS19, PLAT*TPA25, PKHD1L1*Yb8AC702, SEMA6A*Yb8NBC597, STK38L*Ya5ac2145 and TEAD1*Ya5ac2013 Alu elements to longevity. The study group included 2054 unrelated individuals aged from 18 to 113 years who are ethnic Tatars from Russia. We analyzed the dynamics of the allele and genotype frequencies of the studied Alu polymorphic loci in the age groups of young (18-44 years old), middle-aged (45-59 years old), elderly (60-74 years old), old seniors (75-89 years old) and long-livers (90-113 years old). Most significant changes in allele and genotype frequencies were observed between the long-livers and other groups. The search for polygenic predictors of longevity was performed using the APSampler program. Attaining longevity was associated with the combinations LAMA2*ID + CDH4*D (OR = 2.23, PBonf = 1.90 × 10-2) and CDH4*DD + LAMA2*ID + HECW1*D (OR = 4.58, PBonf = 9.00 × 10-3) among persons aged between 18 and 89 years, LAMA2*ID + CDH4*D + SEMA6A*I for individuals below 75 years of age (OR = 3.13, PBonf = 2.00 × 10-2), LAMA2*ID + HECW1*I for elderly people aged 60 and older (OR = 3.13, PBonf = 2.00 × 10-2) and CDH4*DD + LAMA2*D + HECW1*D (OR = 4.21, PBonf = 2.60 × 10-2) and CDH4*DD + LAMA2*D + ACE*I (OR = 3.68, PBonf = 1.90 × 10-2) among old seniors (75-89 years old). The key elements of combinations associated with longevity were the deletion alleles of CDH4 and LAMA2 genes. Our results point to the significance for human longevity of the Alu polymorphic loci in CDH4, LAMA2, HECW1, SEMA6A and ACE genes, involved in the integration systems.
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Affiliation(s)
- Vera V. Erdman
- Institute of Biochemistry and Genetics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450054 Ufa, Russia
| | - Denis D. Karimov
- Ufa Research Institute of Labor Medicine and Human Ecology, 450106 Ufa, Russia
| | - Ilsia A. Tuktarova
- Institute of Biochemistry and Genetics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450054 Ufa, Russia
| | - Yanina R. Timasheva
- Institute of Biochemistry and Genetics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450054 Ufa, Russia
| | - Timur R. Nasibullin
- Institute of Biochemistry and Genetics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450054 Ufa, Russia
| | - Gulnaz F. Korytina
- Institute of Biochemistry and Genetics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450054 Ufa, Russia
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29
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Meyer S, Kaulfuß S, Zechel S, Kummer K, Seif Amir Hosseini A, Ernst MS, Schmidt J, Pauli S, Zschüntzsch J. Evidence of Two Novel LAMA2 Variants in a Patient With Muscular Dystrophy: Facing the Challenges of a Certain Diagnosis. Front Neurol 2022; 13:893605. [PMID: 35928135 PMCID: PMC9344914 DOI: 10.3389/fneur.2022.893605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 06/13/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundBenefits and challenges resulting from advances in genetic diagnostics are two sides of the same coin. Facilitation of a correct and timely diagnosis is paralleled by challenges in interpretation of variants of unknown significance (VUS). Focusing on an individual VUS-re-classification pipeline, this study offers a diagnostic approach for clinically suspected hereditary muscular dystrophy by combining the expertise of an interdisciplinary team.MethodsIn a multi-step approach, a thorough phenotype assessment including clinical examination, laboratory work, muscle MRI and histopathological evaluation of muscle was performed in combination with advanced Next Generation Sequencing (NGS). Different in-silico tools and prediction programs like Alamut, SIFT, Polyphen, MutationTaster and M-Cap as well as 3D- modeling of protein structure and RNA-sequencing were employed to determine clinical significance of the LAMA2 variants.ResultsTwo previously unknown sequence alterations in LAMA2 were detected, a missense variant was classified initially according to ACMG guidelines as a VUS (class 3) whereas a second splice site variant was deemed as likely pathogenic (class 4). Pathogenicity of the splice site variant was confirmed by mRNA sequencing and nonsense mediated decay (NMD) was detected. Combination of the detected variants could be associated to the LGMDR23-phenotype based on the MRI matching and literature research.DiscussionTwo novel variants in LAMA2 associated with LGMDR23-phenotype are described. This study illustrates challenges of the genetic findings due to their VUS classification and elucidates how individualized diagnostic procedure has contributed to the accurate diagnosis in the spectrum of LGMD.
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Affiliation(s)
- Stefanie Meyer
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Silke Kaulfuß
- Department of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
| | - Sabrina Zechel
- Department of Neuropathology, University Medical Center Göttingen, Göttingen, Germany
| | - Karsten Kummer
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Ali Seif Amir Hosseini
- Department of Diagnostic and Interventional Radiology, University Medical Center Göttingen, Göttingen, Germany
| | - Marielle Sophie Ernst
- Department of Neuroradiology, University Medical Center Göttingen, Göttingen, Germany
| | - Jens Schmidt
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany
- Department of Neurology and Pain Treatment, Immanuel Klinik Rüdersdorf, University Hospital of the Brandenburg Medical School Theodor Fontane, Rüdersdorf bei Berlin, Germany
- Faculty of Health Sciences Brandenburg, Brandenburg Medical School Theodor Fontane, Rüdersdorf bei Berlin, Germany
| | - Silke Pauli
- Department of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
| | - Jana Zschüntzsch
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany
- *Correspondence: Jana Zschüntzsch
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Koshorek J, de Macena Sobreira N, Saidha S. LAMA2-related muscular dystrophy mimicking multiple sclerosis. BMJ Case Rep 2022; 15:15/7/e249061. [DOI: 10.1136/bcr-2022-249061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Laminin-alpha2-related muscular dystrophy (LAMA2-MD) is a genetic condition due to reduced LAMA2, a protein found throughout the nervous system. Late-onset LAMA2-MD may present with proximal muscle weakness, joint contractures, neuropathy, epilepsy and/or cardiorespiratory issues, and is less common than the neonatal form. We describe a novel phenotype of LAMA2-MD with progressive myelopathy and spinal cord abnormalities.A woman was referred for evaluation of multiple sclerosis (MS) with progressive gait difficulty and abnormal neuroimaging showing white matter abnormalities in the brain and spinal cord. Ancillary testing was not consistent with primary neuroinflammatory disorders, systemic autoimmunity or infection. Metabolic workup revealed low cyanocobalamin. Genetic testing identified two LAMA2-MD variants.Genetic disorders can mimic treatable neurological conditions. Chronic progressive course, involvement of the peripheral and central nervous systems, and confluent white matter abnormalities should be investigated with molecular testing that includes LAMA2 sequencing to ensure proper diagnosis and management.
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31
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Christen M, Indzhova V, Guo LT, Jagannathan V, Leeb T, Shelton GD, Brocal J. LAMA2 Nonsense Variant in an Italian Greyhound with Congenital Muscular Dystrophy. Genes (Basel) 2021; 12:1823. [PMID: 34828429 PMCID: PMC8618982 DOI: 10.3390/genes12111823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/12/2021] [Accepted: 11/18/2021] [Indexed: 11/30/2022] Open
Abstract
A 4-month-old, male Italian Greyhound with clinical signs of a neuromuscular disease was investigated. The affected dog presented with an abnormal short-strided gait, generalized muscle atrophy, and poor growth since 2-months of age. Serum biochemistry revealed a marked elevation in creatine kinase activity. Electrodiagnostic testing supported a myopathy. Histopathology of muscle biopsies confirmed a dystrophic phenotype with excessive variability in myofiber size, degenerating fibers, and endomysial fibrosis. A heritable form of congenital muscular dystrophy (CMD) was suspected, and a genetic analysis initiated. We sequenced the genome of the affected dog and compared the data to that of 795 control genomes. This search revealed a private homozygous nonsense variant in LAMA2, XM_022419950.1:c.3285G>A, predicted to truncate 65% of the open reading frame of the wild type laminin α2 protein, XP_022275658.1:p.(Trp1095*). Immunofluorescent staining performed on muscle cryosections from the affected dog confirmed the complete absence of laminin α2 in skeletal muscle. LAMA2 loss of function variants were shown to cause severe laminin α2-related CMD in humans, mouse models, and in one previously described dog. Our data together with current knowledge on other species suggest the LAMA2 nonsense variant as cause for the CMD phenotype in the investigated dog.
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Affiliation(s)
- Matthias Christen
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (M.C.); (V.J.)
| | - Victoria Indzhova
- Neurology-Neurosurgery Service, Willows Veterinary Centre and Referral Service, Solihull B90 4NH, West Midlands, UK;
| | - Ling T. Guo
- Department of Pathology, School of Medicine, University of California San Diego, La Jolla, CA 92093-0709, USA; (L.T.G.); (G.D.S.)
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (M.C.); (V.J.)
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (M.C.); (V.J.)
| | - G. Diane Shelton
- Department of Pathology, School of Medicine, University of California San Diego, La Jolla, CA 92093-0709, USA; (L.T.G.); (G.D.S.)
| | - Josep Brocal
- Department of Neurology and Neurosurgery, Anderson Moores Veterinary Specialists, Winchester SO21 2LL, Hampshire, UK;
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Chausova PA, Ryzhkova OP, Rudenskaya GE, Chernykh VB, Shchagina OA, Polyakov AV. A Mosaic Mutation in the LAMA2 Gene in a Case of Merosin-deficient Congenital Muscular Dystrophy. Front Genet 2021; 12:686800. [PMID: 34777456 PMCID: PMC8586452 DOI: 10.3389/fgene.2021.686800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 09/30/2021] [Indexed: 11/18/2022] Open
Abstract
Merosine deficient congenital muscular dystrophy is one of the most common forms of congenital muscular dystrophy. This disease is caused by a primary deficiency or a functionally inactive form of the protein merosin in muscle tissue. The type of inheritance of this disease is autosomal recessive. De novo variants with this type of inheritance are rare, and it is quite possible that the de novo variant may hide a mosaic form in the parent of an affected child. We present a birth family with two affected children who inherited a previously undescribed pathogenic variant c.1755del from their mother and a previously described pathogenic variant c.9253C > T in the LAMA2 gene from their mosaic father. LAMA2 gene mutation analysis was performed by mass parallel sequencing and direct sequencing of genomic DNAs.
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Affiliation(s)
- P A Chausova
- Research Centre for Medical Genetics named after academician N.P. Bochkov, Ministry of Education and Science of the Russian Federation, Moscow, Russia
| | - O P Ryzhkova
- Research Centre for Medical Genetics named after academician N.P. Bochkov, Ministry of Education and Science of the Russian Federation, Moscow, Russia
| | - G E Rudenskaya
- Research Centre for Medical Genetics named after academician N.P. Bochkov, Ministry of Education and Science of the Russian Federation, Moscow, Russia
| | - V B Chernykh
- Research Centre for Medical Genetics named after academician N.P. Bochkov, Ministry of Education and Science of the Russian Federation, Moscow, Russia
| | - O A Shchagina
- Research Centre for Medical Genetics named after academician N.P. Bochkov, Ministry of Education and Science of the Russian Federation, Moscow, Russia
| | - A V Polyakov
- Research Centre for Medical Genetics named after academician N.P. Bochkov, Ministry of Education and Science of the Russian Federation, Moscow, Russia
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Tan D, Ge L, Fan Y, Wei C, Yang H, Liu A, Xiao J, Xiong H, Zhu Y. Muscle magnetic resonance imaging in patients with LAMA2-related muscular dystrophy. Neuromuscul Disord 2021; 31:1144-1153. [PMID: 34702656 DOI: 10.1016/j.nmd.2021.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 09/14/2021] [Accepted: 09/16/2021] [Indexed: 10/20/2022]
Abstract
LAMA2-related muscular dystrophy (LAMA2-MD) is classified into congenital muscular dystrophy type 1A (MDC1A) and autosomal recessive limb-girdle muscular dystrophy-23 (LGMDR23). The purpose of this study was to identify the involvement pattern of thigh muscles of LAMA2-MD patients on magnetic resonance imaging. Fourteen MDC1A and 3 LGMDR23 patients were included, with 21 known and 8 novel LAMA2 disease-causing variants. In LAMA2-MD, the gluteus maximus, anterior (quadriceps femoris) and posterior (adductor magnus and biceps femoris) thigh muscles were extensively and severely affected with fatty infiltration, with relatively sparing of the adductor longus. The pattern of muscle involvement was similar between MDC1A and LGMDR23, but more severe in MDC1A, as well as in LAMA2-MD patients without ambulation. The rather peculiar pattern of the adductor magnus and long head of the biceps femoris first and severely affected in the mid-thigh level was found in LGMDR23. Strong correlation between fatty infiltration and age as well as disease duration was observed for the adductor longus in MDC1A. Edema and atrophy selectively involved in some muscles. The pattern of fatty infiltration on thigh muscle MRI of LAMA2-MD could provide important information for the diagnosis, differential diagnosis and assessment of clinical severity.
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Affiliation(s)
- Dandan Tan
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China
| | - Lin Ge
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China
| | - Yanbin Fan
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China
| | - Cuijie Wei
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China
| | - Haipo Yang
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China
| | - Aijie Liu
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China
| | - Jiangxi Xiao
- Department of Radiology, Peking University First Hospital, No.8 Xishiku Street, West District, Beijing 100034, China
| | - Hui Xiong
- Department of Pediatrics, Peking University First Hospital, No.1 Xi'an Men Street, West District, Beijing 100034, China.
| | - Ying Zhu
- Department of Radiology, Peking University First Hospital, No.8 Xishiku Street, West District, Beijing 100034, China.
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Quijano-Roy S, Haberlova J, Castiglioni C, Vissing J, Munell F, Rivier F, Stojkovic T, Malfatti E, Gómez García de la Banda M, Tasca G, Costa Comellas L, Benezit A, Amthor H, Dabaj I, Gontijo Camelo C, Laforêt P, Rendu J, Romero NB, Cavassa E, Fattori F, Beroud C, Zídková J, Leboucq N, Løkken N, Sanchez-Montañez Á, Ortega X, Kynčl M, Metay C, Gómez-Andrés D, Carlier RY. Diagnostic interest of whole-body MRI in early- and late-onset LAMA2 muscular dystrophies: a large international cohort. J Neurol 2021; 269:2414-2429. [PMID: 34559299 DOI: 10.1007/s00415-021-10806-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 09/12/2021] [Accepted: 09/13/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND LAMA2-related muscular dystrophy (LAMA2-RD) encompasses a group of recessive muscular dystrophies caused by mutations in the LAMA2 gene, which codes for the alpha-2 chain of laminin-211 (merosin). Diagnosis is straightforward in the classic congenital presentation with no ambulation and complete merosin deficiency in muscle biopsy, but is far more difficult in milder ambulant individuals with partial merosin deficiency. OBJECTIVE To investigate the diagnostic utility of muscle imaging in LAMA2-RD using whole-body magnetic resonance imaging (WBMRI). RESULTS 27 patients (2-62 years, 21-80% with acquisition of walking ability and 6 never ambulant) were included in an international collaborative study. All carried two pathogenic mutations, mostly private missense changes. An intronic variant (c.909 + 7A > G) was identified in all the Chilean cases. Three patients (two ambulant) showed intellectual disability, epilepsy, and brain structural abnormalities. WBMRI T1w sequences or T2 fat-saturated images (Dixon) revealed abnormal muscle fat replacement predominantly in subscapularis, lumbar paraspinals, gluteus minimus and medius, posterior thigh (adductor magnus, biceps femoris, hamstrings) and soleus. This involvement pattern was consistent for both ambulant and non-ambulant patients. The degree of replacement was predominantly correlated to the disease duration, rather than to the onset or the clinical severity. A "COL6-like sandwich sign" was observed in several muscles in ambulant adults, but different involvement of subscapularis, gluteus minimus, and medius changes allowed distinguishing LAMA2-RD from collagenopathies. The thigh muscles seem to be the best ones to assess disease progression. CONCLUSION WBMRI in LAMA2-RD shows a homogeneous pattern of brain and muscle imaging, representing a supportive diagnostic tool.
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Affiliation(s)
- Susana Quijano-Roy
- APHP, GH Université Paris-Saclay, Neuromuscular Center, Child Neurology and ICU Department, Raymond Poincare Hospital, Garches, France
- Université de Versailles, U1179 INSERM-UVSQ, Versailles, France
| | - Jana Haberlova
- Department of Paediatric Neurology, Motol University Hospital, Prague, Czech Republic
| | - Claudia Castiglioni
- Pediatric Neurology Department, Clinica Las Condes, Santiago de Chile, Chile
- Instituto Nacional de Rehabilitación Pedro Aguirre Cerda, Santiago de Chile, Chile
| | - John Vissing
- Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Francina Munell
- Pediatric Neurology, Vall d'Hebron Institut de Recerca (VHIR), Hospital Universitari Vall d'Hebron, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain, Passeig de la Vall d'Hebron 119-129, 08035
| | - François Rivier
- Department of Pediatric Neurology and Reference Center for Neuromuscular Diseases AOC, CHU Montpellier, Montpellier, France
- PhyMedExp, University of Montpellier, INSERM, CNRS, Montpellier, France
| | - Tanya Stojkovic
- APHP, Neuromuscular Reference Center, Pitié-Salpêtrière Hospital, Institute of Myology, Paris, France
| | - Edoardo Malfatti
- Univ Paris Est UPE, INSERM, U955 IMRB, APHP, Centre de Référence de Pathologie Neuromusculaire Nord-Est-Ile-de-France, Hôpital Henri Mondor, Créteil, France
| | - Marta Gómez García de la Banda
- APHP, GH Université Paris-Saclay, Neuromuscular Center, Child Neurology and ICU Department, Raymond Poincare Hospital, Garches, France
| | - Giorgio Tasca
- Unità Operativa Complessa Di Neurologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italia
| | - Laura Costa Comellas
- Pediatric Neurology, Vall d'Hebron Institut de Recerca (VHIR), Hospital Universitari Vall d'Hebron, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain, Passeig de la Vall d'Hebron 119-129, 08035
| | - Audrey Benezit
- APHP, GH Université Paris-Saclay, Neuromuscular Center, Child Neurology and ICU Department, Raymond Poincare Hospital, Garches, France
| | - Helge Amthor
- APHP, GH Université Paris-Saclay, Neuromuscular Center, Child Neurology and ICU Department, Raymond Poincare Hospital, Garches, France
- Université de Versailles, U1179 INSERM-UVSQ, Versailles, France
| | - Ivana Dabaj
- APHP, GH Université Paris-Saclay, Neuromuscular Center, Child Neurology and ICU Department, Raymond Poincare Hospital, Garches, France
- CHU de Rouen, Service de Néonatologie, Réanimation pédiatrique, Neuropédiatrie et Éducation Fonctionnelle de L'enfant, INSERM U 1245, ED497, 76000, Rouen, France
| | - Clara Gontijo Camelo
- Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil
| | - Pascal Laforêt
- Nord/Est/Ile de France Neuromuscular Reference Center, PHENIX FHU, Hôpital Raymond-Poincaré, AP-HP. INSERM U1179, Garches, France
| | - John Rendu
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, GIN, Grenoble, France
| | - Norma B Romero
- Sorbonne Université, Myology Institute, Neuromuscular Morphology Unit, Center for Research in Myology, GH Pitié-Salpêtrière, Paris, France
- Centre de Référence de Pathologie Neuromusculaire Paris-Est, GHU Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Eliana Cavassa
- APHP, GH Université Paris-Saclay, Neuromuscular Center, Child Neurology and ICU Department, Raymond Poincare Hospital, Garches, France
| | - Fabiana Fattori
- Unit for Neuromuscular and Neurodegenerative Disorders, Bambino Gesù Children's Hospital, Rome, Italy
| | - Christophe Beroud
- APHM, Laboratoire de Génétique Moléculaire, Hôpital TIMONE Enfants; Aix Marseille University, INSERM, MMG, Marseille, France
| | - Jana Zídková
- Centre of Molecular Biology and Genetics, University Hospital Brno, Brno, Czech Republic
| | | | - Nicoline Løkken
- Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Ángel Sanchez-Montañez
- Pediatric Neuroradiology, Radiology Department, Hospital Universitari Vall d'Hebron, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain
| | - Ximena Ortega
- Diagnostic Imaging Service, Clinica Las Condes, Santiago de Chile, Chile
| | - Martin Kynčl
- Department of Radiology, Motol University Hospital, Prague, Czech Republic
| | - Corinne Metay
- AP-HP, UF Cardiogénétique et Myogénétique Moléculaire et Cellulaire, Centre de Génétique Moléculaire et Chromosomique, GH Pitié Salpêtrière, Paris, France
- Sorbonne Université - Inserm UMRS974, Centre de Recherche en Myologie, GH Pitié-Salpêtrière, Paris, France
| | - David Gómez-Andrés
- Pediatric Neurology, Vall d'Hebron Institut de Recerca (VHIR), Hospital Universitari Vall d'Hebron, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain, Passeig de la Vall d'Hebron 119-129, 08035.
| | - Robert Y Carlier
- APHP, GH Université Paris-Saclay, DMU Smart Imaging, Medical Imaging Department, Raymond Poincaré Teaching Hospital, Garches, France
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Khorrami A, Goleij P, Karamad V, Taheri E, Shadman B, Emami P, Jahangirzadeh G, Hajazimian S, Isazadeh A, Baradaran B, Heidari M. Identification of a compound heterozygous missense mutation in LAMA2 gene from a patient with merosin-deficient congenital muscular dystrophy type 1A. J Clin Lab Anal 2021; 35:e23930. [PMID: 34528292 PMCID: PMC8605159 DOI: 10.1002/jcla.23930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/29/2021] [Accepted: 07/20/2021] [Indexed: 01/08/2023] Open
Abstract
Background Merosin‐deficient congenital muscular dystrophy type 1A (MDC1A) is occurred by mutations in LAMA2 gene that encodes the laminin α2 chain (merosin). MDC1A is a predominant subtype of congenital muscular dystrophy. Herein, we identified two missense mutations in LAMA2 gene in compound heterozygous status in an Iranian patient with MDC1A using whole‐exome sequencing (WES). Methods In the present study, we evaluated genetic alterations in an Iranian 35‐month‐old boy with MDC1A and his healthy family using WES method. The identified mutations further confirmed by Sanger sequencing method. Finally, in silico analysis was conducted to further evaluation of molecular function of the identified genetic variants. Results We identified two potentially pathogenic missense mutations in compound heterozygous state (c.7681G>A p.Gly2561Ser and c.4840A>G p.Asn1614Asp) in LAMA2 gene as contributing to the MDC1A phenotype. The healthy parents of our proband are single heterozygous for identified mutations. These variants were found to be pathogenic by in silico analysis. Conclusions In general, we successfully identified LAMA2 gene mutations in an Iranian patient with MDC1A using WES. The identified mutations in LAMA2 gene can be useful in genetic counseling, prenatal diagnosis, and predicting prognosis of MDC1A.
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Affiliation(s)
- Afshin Khorrami
- Young Researchers and Elit Club, Varamin-Pishva Branch, Islamic Azad University, Varamin-Pishva, Iran
| | - Pouya Goleij
- Department of Genetics, Faculty of Biology, Sana Institute of Higher Education, Sari, Iran
| | - Vahidreza Karamad
- Department of Medical Biology, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Elham Taheri
- Department of Pharmaceutical Biotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Behrouz Shadman
- Department of Medical Biology, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Parisa Emami
- Department of Genetics, Ahar Branch, Islamic Azad University, Ahar, Iran
| | | | - Saba Hajazimian
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Alireza Isazadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mansour Heidari
- Department of Medical Genetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
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Jelinkova S, Martyniak A, Dulak J, Stępniewski J. Derivation of human pluripotent stem cell line via CRISPR/Cas9 mediated deletion of exon 3 LAMA2 gene (DMBi001-A-1). Stem Cell Res 2021; 56:102529. [PMID: 34509921 DOI: 10.1016/j.scr.2021.102529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/13/2021] [Accepted: 08/30/2021] [Indexed: 11/22/2022] Open
Abstract
LAMA2-related muscular dystrophy (LAMA2-MD) results from mutations in LAMA2 gene, encoding laminin α-2. It is a congenital disease characterized by muscle wasting, with the most severe version being diagnosed within first few months after birth. To generate LAMA2-DM in vitro model, we excised exon 3 from the LAMA2 gene in our previously derived healthy human induced pluripotent stem cells (hiPSCs). Obtained hiPSCs show expression of pluripotency markers, differentiation capacity into all three germ layers, normal karyotype and lack of LAMA2 expression on mRNA and protein level after differentiation into skeletal myocytes. Accordingly, it may provide novel insight into the molecular basis of LAMA2-MD.
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Abstract
The laminins (LM) are a family of basement membranes glycoproteins with essential structural roles in supporting epithelia, endothelia, nerves and muscle adhesion, and signaling roles in regulating cell migration, proliferation, stem cell maintenance and differentiation. Laminins are obligate heterotrimers comprised of α, β and γ chains that assemble intracellularly. However, extracellularly these heterotrimers then assemble into higher-order networks via interaction between their laminin N-terminal (LN) domains. In vitro protein studies have identified assembly kinetics and the structural motifs involved in binding of adjacent LN domains. The physiological importance of these interactions has been identified through the study of pathogenic point mutations in LN domains that lead to syndromic disorders presenting with phenotypes dependent on which laminin gene is mutated. Genotype-phenotype comparison between knockout and LN domain missense mutations of the same laminin allows inferences to be drawn about the roles of laminin network assembly in terms of tissue function. In this review, we will discuss these comparisons in terms of laminin disorders, and the therapeutic options that understanding these processes have allowed. We will also discuss recent findings of non-laminin mediators of laminin network assembly and their implications in terms of basement membrane structure and function.
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Affiliation(s)
| | | | - Kevin J. Hamill
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
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Abstract
There is increasing evidence of central nervous system involvement in numerous neuromuscular disorders primarily considered diseases of skeletal muscle. Our knowledge on cerebral affection in myopathies is expanding continuously due to a better understanding of the genetic background and underlying pathophysiological mechanisms. Intriguingly, there is a remarkable overlap of brain pathology in muscular diseases with pathomechanisms involved in neurodegenerative or neurodevelopmental disorders. A rapid progress in advanced neuroimaging techniques results in further detailed insight into structural and functional cerebral abnormalities. The spectrum of clinical manifestations is broad and includes movement disorders, neurovascular complications, paroxysmal neurological symptoms like migraine and epileptic seizures, but also behavioural abnormalities and cognitive dysfunction. Cerebral involvement implies a high socio-economic and personal burden in adult patients sometimes exceeding the everyday challenges associated with muscle weakness. It is especially important to clarify the nature and natural history of brain affection against the background of upcoming specific treatment regimen in hereditary myopathies that should address the brain as a secondary target. This review aims to highlight the character and extent of central nervous system involvement in patients with hereditary myopathies manifesting in adulthood, however also includes some childhood-onset diseases with brain abnormalities that transfer into adult neurological care.
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Affiliation(s)
- Jens Reimann
- Department of Neurology, Section of Neuromuscular Diseases, University Hospital Bonn, Germany.,Center for Rare Diseases, University Hospital Bonn, Germany
| | - Cornelia Kornblum
- Department of Neurology, Section of Neuromuscular Diseases, University Hospital Bonn, Germany.,Center for Rare Diseases, University Hospital Bonn, Germany
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Salvati A, Bonaventura E, Sesso G, Pasquariello R, Sicca F. Epilepsy in LAMA2-related muscular dystrophy: A systematic review of the literature. Seizure 2021; 91:425-436. [PMID: 34325301 DOI: 10.1016/j.seizure.2021.07.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 07/16/2021] [Accepted: 07/17/2021] [Indexed: 01/16/2023] Open
Abstract
Epilepsy is a common, often severe, feature of LAMA2-related muscular dystrophy (LAMA2-RD) and could represent its onset and main manifestation, even in the absence of overt muscle involvement. To date, there is no systematic characterization of epilepsy in LAMA2-RD, and its impact on neurodevelopment and on the clinical course remains poorly established. In view of this knowledge gap, we conducted a systematic review of the literature and, as an illustrative example, reported the clinical case of a boy with late-onset LAMA2-related limb-girdle muscular dystrophy presenting with severe epilepsy. Our analyses of the literature data revealed a mean age at first seizure of 8 years, with significant differences between early- versus late-onset disease (5.78 ± 4.11 and 9.00 ± 2.65 years, respectively; p = 0.0007), and complete versus partial merosin deficiency (5.33 ± 3.70 and 10.36 ± 5.49 years, respectively; p = 0.0176). A generalized onset was the most common seizure presentation, regardless of merosin expression levels or the timing of muscular distrophy onset. Cortical malformations were not significantly associated with an earlier epilepsy onset, and were found to be quasi-significantly associated with a greater incidence of focal, or focal and generalized, onset seizures. No clear conclusions could be reached on the electrophysiological and neurodevelopmental features of the disorder, or on the relative efficacy of anti-epileptic treatments; further research on these aspects is needed. This systematic review helps to show that epilepsy in LAMA2-RD may be more than an ancillary manifestation of the disease, but rather one of its core features. A targeted and prompt electroencephalographic and epilepsy assessment, in addition to the specific neuromuscular workup, is therefore mandatory in early clinical management to pursue the best possible outcome for affected children.
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Affiliation(s)
- Andrea Salvati
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Eleonora Bonaventura
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Gianluca Sesso
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Rossella Pasquariello
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, Calambrone, Pisa, Italy
| | - Federico Sicca
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, Calambrone, Pisa, Italy.
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Latypova X, Creadore SG, Dahan-Oliel N, Gustafson AG, Wei-Hung Hwang S, Bedard T, Shazand K, van Bosse HJP, Giampietro PF, Dieterich K. A Genomic Approach to Delineating the Occurrence of Scoliosis in Arthrogryposis Multiplex Congenita. Genes (Basel) 2021; 12:genes12071052. [PMID: 34356068 PMCID: PMC8305424 DOI: 10.3390/genes12071052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/28/2021] [Accepted: 06/29/2021] [Indexed: 12/15/2022] Open
Abstract
Arthrogryposis multiplex congenita (AMC) describes a group of conditions characterized by the presence of non-progressive congenital contractures in multiple body areas. Scoliosis, defined as a coronal plane spine curvature of ≥10 degrees as measured radiographically, has been reported to occur in approximately 20% of children with AMC. To identify genes that are associated with both scoliosis as a clinical outcome and AMC, we first queried the DECIPHER database for copy number variations (CNVs). Upon query, we identified only two patients with both AMC and scoliosis (AMC-SC). The first patient contained CNVs in three genes (FBN2, MGF10, and PITX1), while the second case had a CNV in ZC4H2. Looking into small variants, using a combination of Human Phenotype Ontogeny and literature searching, 908 genes linked with scoliosis and 444 genes linked with AMC were identified. From these lists, 227 genes were associated with AMC-SC. Ingenuity Pathway Analysis (IPA) was performed on the final gene list to gain insight into the functional interactions of genes and various categories. To summarize, this group of genes encompasses a diverse group of cellular functions including transcription regulation, transmembrane receptor, growth factor, and ion channels. These results provide a focal point for further research using genomics and animal models to facilitate the identification of prognostic factors and therapeutic targets for AMC.
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Affiliation(s)
- Xenia Latypova
- Grenoble Institut Neurosciences, Université Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, 38000 Grenoble, France;
| | | | - Noémi Dahan-Oliel
- Shriners Hospitals for Children, Montreal, QC H4A 0A9, Canada;
- School of Physical & Occupational Therapy, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC H3G 2M1, Canada
| | | | - Steven Wei-Hung Hwang
- Shriners Hospitals for Children, Philadelphia, PA 19140, USA; (S.W.-H.H.); (H.J.P.v.B.)
| | - Tanya Bedard
- Alberta Congenital Anomalies Surveillance System, Alberta Health Services, Edmonton, AB T5J 3E4, Canada;
| | - Kamran Shazand
- Shriners Hospitals for Children Headquarters, Tampa, FL 33607, USA; (S.G.C.); (A.G.G.); (K.S.)
| | | | - Philip F. Giampietro
- Department of Pediatrics, University of Illinois-Chicago, Chicago, IL 60607, USA
- Correspondence: (P.F.G.); (K.D.)
| | - Klaus Dieterich
- Institut of Advanced Biosciences, Université Grenoble Alpes, Inserm, U1209, CHU Grenoble Alpes, 38000 Grenoble, France
- Correspondence: (P.F.G.); (K.D.)
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Smeets HJM, Verbrugge B, Springuel P, Voermans NC. Merosin deficient congenital muscular dystrophy type 1A: An international workshop on the road to therapy 15-17 November 2019, Maastricht, the Netherlands. Neuromuscul Disord 2021; 31:673-680. [PMID: 34130888 PMCID: PMC8994498 DOI: 10.1016/j.nmd.2021.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 04/16/2021] [Indexed: 10/21/2022]
Affiliation(s)
- Hubert J M Smeets
- Department of Toxicogenomics, Research Schools GROW and MHeNS, Maastricht University, Maastricht, The Netherlands.
| | - Bram Verbrugge
- MDC1A Foundation "Voor Sara", Dordrecht, The Netherlands
| | | | - Nicol C Voermans
- Department of Neurology, Radboud University Medical Center, Nijmegen, The Netherlands
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El Kadiri Y, Ratbi I, Laarabi FZ, Kriouile Y, Sefiani A, Lyahyai J. Identification of a novel LAMA2 c.2217G > A, p.(Trp739*) mutation in a Moroccan patient with congenital muscular dystrophy: a case report. BMC Med Genomics 2021; 14:113. [PMID: 33882917 PMCID: PMC8060993 DOI: 10.1186/s12920-021-00959-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 04/12/2021] [Indexed: 01/22/2023] Open
Abstract
Background Merosin-deficient congenital muscular dystrophy type 1A (MDC1A) is a rare autosomal recessive genetic condition caused by deleterious mutations in the LAMA2 gene encoding the laminin-α2 chain. It is the most frequent subtype of congenital muscular dystrophies (CMDs) characterized by total laminin-α2 deficiency with muscle weakness at birth or in the first six months of life. To the best of our knowledge, this study reports the first molecular diagnosis and genetic defect of this heterogeneous form of CMD performed in a Moroccan medical genetic center using next-generation sequencing (NGS). It allows us to expand the mutational spectrum of the LAMA2 gene. Case presentation We report the case of a female Moroccan child with clinical and paraclinical features in favor of a CMD. She has global congenital hypotonia with generalized muscle weakness, psychomotor retardation, increased serum creatine kinase, and normal brain scan at the age of six months. Targeted NGS leads to the identification of a novel homozygous nonsense mutation c.2217G > A, p.(Trp739*) in the exon 16 of LAMA2. Sanger sequencing confirmed this mutation in the affected patient and showed that her parents are heterozygous carriers. Conclusions A modern genetic analysis by NGS improves the genetic diagnosis pathway for adequate genetic counseling of affected families more precisely. An accession number from the National Center for Biotechnology Information (NCBI) ClinVar database was retrieved for this novel LAMA2 mutation.
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Affiliation(s)
- Youssef El Kadiri
- Centre de Recherche en Génomique des Pathologies Humaines (GENOPATH), Faculté de Médecine et de Pharmacie, Mohammed V University in Rabat, 10100, Rabat, Morocco. .,Département de Génétique Médicale, Institut National d'Hygiène, BP 769 Agdal, 10090, Rabat, Morocco.
| | - Ilham Ratbi
- Centre de Recherche en Génomique des Pathologies Humaines (GENOPATH), Faculté de Médecine et de Pharmacie, Mohammed V University in Rabat, 10100, Rabat, Morocco
| | - Fatima Zahra Laarabi
- Département de Génétique Médicale, Institut National d'Hygiène, BP 769 Agdal, 10090, Rabat, Morocco
| | - Yamna Kriouile
- Unité de Neuropédiatrie et Maladies Neuro-Métaboliques, Service de Pédiatrie 2- Hôpital d'enfants, Rabat, Morocco
| | - Abdelaziz Sefiani
- Centre de Recherche en Génomique des Pathologies Humaines (GENOPATH), Faculté de Médecine et de Pharmacie, Mohammed V University in Rabat, 10100, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, BP 769 Agdal, 10090, Rabat, Morocco
| | - Jaber Lyahyai
- Centre de Recherche en Génomique des Pathologies Humaines (GENOPATH), Faculté de Médecine et de Pharmacie, Mohammed V University in Rabat, 10100, Rabat, Morocco
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Specht S, Duff J, Charlton R, Polvikoski T, Barresi R, Töpf A, Straub V. A cryptic intronic LAMA2 insertion in a boy with mild congenital muscular dystrophy type 1A. Neuromuscul Disord 2021; 31:660-5. [PMID: 34074572 DOI: 10.1016/j.nmd.2021.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 03/20/2021] [Accepted: 03/24/2021] [Indexed: 11/20/2022]
Abstract
Recessive mutations in the LAMA2 gene lead to congenital muscular dystrophy type 1A and limb girdle muscular dystrophy R23 with complete or partial laminin α2 chain deficiency. Complete laminin α2 chain deficiency presents with early onset of severe hypotonia and generalized weakness, whereas partial deficiency shows a milder and more variable course with limb girdle weakness. Here, we report a child with mildly delayed motor development, elevated serum creatine kinase levels (>1000 U/l) and brain white matter hypointensity, indicative of laminin α2 chain deficiency. In addition to a stop gain variant in exon 39, the patient was found to carry an intronic insertion of 72 bp in intron 38 of the LAMA2 gene in trans. RNA analysis revealed that this insertion results in abnormally spliced as well as wild type transcript, which explains the partial laminin α2 chain deficiency observed in the muscle biopsy.
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Zaganas I, Mastorodemos V, Spilioti M, Mathioudakis L, Latsoudis H, Michaelidou K, Kotzamani D, Notas K, Dimitrakopoulos K, Skoula I, Ioannidis S, Klothaki E, Erimaki S, Stavropoulos G, Vassilikos V, Amoiridis G, Efthimiadis G, Evangeliou A, Mitsias P. Genetic cause of heterogeneous inherited myopathies in a cohort of Greek patients. Mol Genet Metab Rep 2020; 25:100682. [PMID: 33304817 PMCID: PMC7711282 DOI: 10.1016/j.ymgmr.2020.100682] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 11/13/2020] [Accepted: 11/13/2020] [Indexed: 02/07/2023] Open
Abstract
Inherited muscle disorders are caused by pathogenic changes in numerous genes. Herein, we aimed to investigate the etiology of muscle disease in 24 consecutive Greek patients with myopathy suspected to be genetic in origin, based on clinical presentation and laboratory and electrophysiological findings and absence of known acquired causes of myopathy. Of these, 16 patients (8 females, median 24 years-old, range 7 to 67 years-old) were diagnosed by Whole Exome Sequencing as suffering from a specific type of inherited muscle disorder. Specifically, we have identified causative variants in 6 limb-girdle muscular dystrophy genes (6 patients; ANO5, CAPN3, DYSF, ISPD, LAMA2, SGCA), 3 metabolic myopathy genes (4 patients; CPT2, ETFDH, GAA), 1 congenital myotonia gene (1 patient; CLCN1), 1 mitochondrial myopathy gene (1 patient; MT-TE) and 3 other myopathy-associated genes (4 patients; CAV3, LMNA, MYOT). In 6 additional family members affected by myopathy, we reached genetic diagnosis following identification of a causative variant in an index patient. In our patients, genetic diagnosis ended a lengthy diagnostic process and, in the case of Multiple acyl-CoA dehydrogenase deficiency and Pompe's disease, it enabled specific treatment to be initiated. These results further expand the genotypic and phenotypic spectrum of inherited myopathies.
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Affiliation(s)
- Ioannis Zaganas
- Neurogenetics Laboratory, Medical School, University of Crete, Heraklion, Crete, Greece.,Neurology Department, University Hospital of Crete, Heraklion, Crete, Greece
| | | | - Martha Spilioti
- AHEPA General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Lambros Mathioudakis
- Neurogenetics Laboratory, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Helen Latsoudis
- Neurogenetics Laboratory, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Kleita Michaelidou
- Neurogenetics Laboratory, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Dimitra Kotzamani
- Neurogenetics Laboratory, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Konstantinos Notas
- AHEPA General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | | | - Irene Skoula
- Neurogenetics Laboratory, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Stefanos Ioannidis
- Neurology Department, University Hospital of Crete, Heraklion, Crete, Greece
| | - Eirini Klothaki
- Neurology Department, University Hospital of Crete, Heraklion, Crete, Greece
| | - Sophia Erimaki
- Neurophysiology Unit, University Hospital of Crete, Heraklion, Crete, Greece
| | - Georgios Stavropoulos
- Hippokratio General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Vassilios Vassilikos
- Hippokratio General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Georgios Amoiridis
- Neurophysiology Unit, University Hospital of Crete, Heraklion, Crete, Greece
| | - Georgios Efthimiadis
- AHEPA General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Athanasios Evangeliou
- Papageorgiou General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Panayiotis Mitsias
- Neurology Department, University Hospital of Crete, Heraklion, Crete, Greece.,Neurophysiology Unit, University Hospital of Crete, Heraklion, Crete, Greece.,Department of Neurology, Henry Ford Hospital/Wayne State University, Detroit, Michigan, USA
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Sanga S, Ghosh A, Kumar K, Polavarapu K, Preethish-Kumar V, Vengalil S, Nashi S, Bardhan M, Arunachal G, Raju S, Gayathri N, Biswas NK, Chakrabarti S, Nalini A, Roy S, Acharya M. Whole-exome analyses of congenital muscular dystrophy and congenital myopathy patients from India reveal a wide spectrum of known and novel mutations. Eur J Neurol 2020; 28:992-1003. [PMID: 33124102 DOI: 10.1111/ene.14616] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 10/22/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND PURPOSE Congenital muscular dystrophies (CMDs) and congenital myopathies (CMs) are a group of genetically and clinically heterogeneous degenerative primary muscle disorders with onset at birth or during infancy. Due to vast heterogeneity, clinical examination and protein-based analyses often fail to identify the genetic causes of these diseases. The aim of this study was to genetically diagnose a cohort of 36 difficult-to-diagnose CMD and CM cases of Indian origin using next-generation sequencing methods. METHODS Whole-exome sequencing (WES) was performed to identify pathogenic mutations in previously reported CMD and CM-related genes using variant calling and stringent variant filtration process. Subsequently, in silico homology modelling and molecular dynamics simulations (MDS) studies were undertaken for a number of novel and missense variants. RESULTS A total of 33 and 21 rare and deleterious mutations were identified in 28 genes previously reported in CMD and CM based on OMIM, ClinVar and Orphanet, respectively. We could accurately diagnose 54% patients (n = 12/22) in the CMD group and 35% patients (n = 5/14) in the CM group. Furthermore, MDS studies for mutations located in LMNA, LAMA2 and RYR1 suggest that the wild-type proteins are more stable than their mutant counterparts, implying a potential mechanism of pathogenesis. CONCLUSION The WES findings led us to identify reported as well as novel variants for the first time in Indian patients with CMD and CM. This allowed us to achieve an accurate genetic diagnosis, which was difficult using conventional diagnostic tools. Transferring these WES findings to clinical practice will help guide clinical care of the affected patients and inform genetic counselling.
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Affiliation(s)
- Shamita Sanga
- National Institute of Biomedical Genomics, Kalyani, India
| | - Arnab Ghosh
- National Institute of Biomedical Genomics, Kalyani, India
| | - Krishna Kumar
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Kolkata, India
| | - Kiran Polavarapu
- Department of Neurology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | | | - Seena Vengalil
- Department of Neurology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | - Saraswati Nashi
- Department of Neurology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | - Mainak Bardhan
- Department of Neurology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | - Gautham Arunachal
- Department of Human Genetics, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | - Sanita Raju
- Department of Neurology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | - Narayanappa Gayathri
- Department of Neuropathology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | | | - Saikat Chakrabarti
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Kolkata, India
| | - Atchayaram Nalini
- Department of Neurology, National Institute of Mental Health and Neuroscience, Bengaluru, India
| | - Sudipto Roy
- Institute of Molecular and Cell Biology, Singapore City, Singapore.,Department of Biological Sciences, National University of Singapore, Singapore City, Singapore.,Department of Pediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore City, Singapore
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Ferent J, Zaidi D, Francis F. Extracellular Control of Radial Glia Proliferation and Scaffolding During Cortical Development and Pathology. Front Cell Dev Biol 2020; 8:578341. [PMID: 33178693 PMCID: PMC7596222 DOI: 10.3389/fcell.2020.578341] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 09/08/2020] [Indexed: 01/14/2023] Open
Abstract
During the development of the cortex, newly generated neurons migrate long-distances in the expanding tissue to reach their final positions. Pyramidal neurons are produced from dorsal progenitors, e.g., radial glia (RGs) in the ventricular zone, and then migrate along RG processes basally toward the cortex. These neurons are hence dependent upon RG extensions to support their migration from apical to basal regions. Several studies have investigated how intracellular determinants are required for RG polarity and subsequent formation and maintenance of their processes. Fewer studies have identified the influence of the extracellular environment on this architecture. This review will focus on extracellular factors which influence RG morphology and pyramidal neuronal migration during normal development and their perturbations in pathology. During cortical development, RGs are present in different strategic positions: apical RGs (aRGs) have their cell bodies located in the ventricular zone with an apical process contacting the ventricle, while they also have a basal process extending radially to reach the pial surface of the cortex. This particular conformation allows aRGs to be exposed to long range and short range signaling cues, whereas basal RGs (bRGs, also known as outer RGs, oRGs) have their cell bodies located throughout the cortical wall, limiting their access to ventricular factors. Long range signals impacting aRGs include secreted molecules present in the embryonic cerebrospinal fluid (e.g., Neuregulin, EGF, FGF, Wnt, BMP). Secreted molecules also contribute to the extracellular matrix (fibronectin, laminin, reelin). Classical short range factors include cell to cell signaling, adhesion molecules and mechano-transduction mechanisms (e.g., TAG1, Notch, cadherins, mechanical tension). Changes in one or several of these components influencing the RG extracellular environment can disrupt the development or maintenance of RG architecture on which neuronal migration relies, leading to a range of cortical malformations. First, we will detail the known long range signaling cues impacting RG. Then, we will review how short range cell contacts are also important to instruct the RG framework. Understanding how RG processes are structured by their environment to maintain and support radial migration is a critical part of the investigation of neurodevelopmental disorders.
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Affiliation(s)
- Julien Ferent
- Inserm, U 1270, Paris, France.,Sorbonne University, UMR-S 1270, IFM, Paris, France.,Institut du Fer á Moulin, Paris, France
| | - Donia Zaidi
- Inserm, U 1270, Paris, France.,Sorbonne University, UMR-S 1270, IFM, Paris, France.,Institut du Fer á Moulin, Paris, France
| | - Fiona Francis
- Inserm, U 1270, Paris, France.,Sorbonne University, UMR-S 1270, IFM, Paris, France.,Institut du Fer á Moulin, Paris, France
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48
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Nguyen NL, Ngoc CTB, Vu CD, Nguyen TTH, Nguyen HH. Whole Exome Sequencing as a Diagnostic Tool for Unidentified Muscular Dystrophy in a Vietnamese Family. Diagnostics (Basel) 2020; 10:E741. [PMID: 32987775 DOI: 10.3390/diagnostics10100741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/15/2020] [Accepted: 09/22/2020] [Indexed: 11/17/2022] Open
Abstract
Muscular dystrophies are a group of heterogeneous clinical and genetic disorders. Two siblings presented with characteristics like muscular dystrophy, abnormal white matter, and elevated serum creatine kinase level. The high throughput of whole exome sequencing (WES) makes it an efficient tool for obtaining a precise diagnosis without the need for immunohistochemistry. WES was performed in the two siblings and their parents, followed by prioritization of variants and validation by Sanger sequencing. Very rare variants with moderate to high predicted impact in genes associated with neuromuscular disorders were selected. We identified two pathogenic missense variants, c.778C>T (p.H260Y) and c.2987G>A (p.C996Y), in the LAMA2 gene (NM_000426.3), in the homozygous state in two siblings, and in the heterozygous state in their unaffected parents, which were confirmed by Sanger sequencing. Variant c.2987G>A has not been reported previously. These variants may lead to a change in the structure and function of laminin-α2, a member of the family of laminin-211, which is an extracellular matrix protein that functions to stabilize the basement membrane of muscle fibers during contractions. Overall, WES enabled an accurate diagnosis of both patients with LAMA2-related muscular dystrophy and expanded the spectrum of missense variants in LAMA2.
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Cauley ES, Pittman A, Mummidivarpu S, Karimiani EG, Martinez S, Moroni I, Boostani R, Podini D, Mora M, Jamshidi Y, Hoffman EP, Manzini MC. Novel mutation identification and copy number variant detection via exome sequencing in congenital muscular dystrophy. Mol Genet Genomic Med 2020; 8:e1387. [PMID: 32936536 PMCID: PMC7667317 DOI: 10.1002/mgg3.1387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 05/19/2020] [Accepted: 05/21/2020] [Indexed: 12/13/2022] Open
Abstract
Background Congenital muscular dystrophy type 1A (MDC1A), also termed merosin‐deficient congenital muscular dystrophy (CMD), is a severe form of CMD caused by mutations in the laminin α2 gene (LAMA2). Of the more than 300 likely pathogenic variants found in the Leiden Open Variant Database, the majority are truncating mutations leading to complete LAMA2 loss of function, but multiple copy number variants (CNVs) have also been reported with variable frequency. Methods We collected a cohort of individuals diagnosed with likely MDC1A and sought to identify both single nucleotide variants and small and larger CNVs via exome sequencing by extending the analysis of sequencing data to detect splicing changes and CNVs. Results Standard exome analysis identified multiple novel LAMA2 variants in our cohort, but only four cases carried biallelic variants. Since likely truncating LAMA2 variants are often found in heterozygosity without a second allele, we performed additional splicing and CNV analysis on exome data and identified one splice change outside of the canonical sequences and three CNVs, in the remaining four cases. Conclusions Our findings support the expectation that a portion of MDC1A cases may be caused by at least one CNV allele and show how these changes can be effectively identified by additional analysis of existing exome data.
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Affiliation(s)
- Edmund S Cauley
- Department of Pharmacology and Physiology, Institute for Neuroscience, The George Washington University, Washington, DC, USA
| | - Alan Pittman
- Molecular and Clinical Sciences Institute, St. George's, University of London, London, United Kingdom
| | - Swati Mummidivarpu
- Departments of Pharmaceutical Sciences and Biomedical Engineering, Binghamton University-SUNY, Binghamton, NY, USA
| | - Ehsan G Karimiani
- Molecular and Clinical Sciences Institute, St. George's, University of London, London, United Kingdom.,Innovative Medical Research Center, Islamic Azad University, Mashhad, Iran
| | - Samantha Martinez
- Department of Pharmacology and Physiology, Institute for Neuroscience, The George Washington University, Washington, DC, USA
| | - Isabella Moroni
- Department of Pediatric Neuroscience, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Reza Boostani
- Department of Neurology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Daniele Podini
- Department of Forensic Sciences, The George Washington University, Washington, DC, USA
| | - Marina Mora
- Division of Neuromuscular Diseases and Neuroimmunology, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Yalda Jamshidi
- Molecular and Clinical Sciences Institute, St. George's, University of London, London, United Kingdom
| | - Eric P Hoffman
- Departments of Pharmaceutical Sciences and Biomedical Engineering, Binghamton University-SUNY, Binghamton, NY, USA
| | - M Chiara Manzini
- Department of Pharmacology and Physiology, Institute for Neuroscience, The George Washington University, Washington, DC, USA.,Child Health Institute of New Jersey and Department of Neuroscience and Cell Biology, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
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Liang J, Li H, Han J, Jiang J, Wang J, Li Y, Feng Z, Zhao R, Sun Z, Lv B, Tian H. Mex3a interacts with LAMA2 to promote lung adenocarcinoma metastasis via PI3K/AKT pathway. Cell Death Dis 2020; 11:614. [PMID: 32792503 DOI: 10.1038/s41419-020-02858-3] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 07/30/2020] [Accepted: 07/30/2020] [Indexed: 12/17/2022]
Abstract
Lung adenocarcinoma (LUAD) is the main subtype of lung cancer. In this study, we found that RBP Mex3a was significantly upregulated in LUAD tissues and elevated Mex3a expression was associated with poor LUAD prognosis and metastasis. Furthermore, we demonstrated that Mex3a knockdown significantly inhibited LUAD cell migration and invasion in vitro and metastasis in nude mice. Transcriptome sequencing indicated that Mex3a affected gene expression linked to ECM-receptor interactions, including laminin subunit alpha 2(LAMA2). RNA immunoprecipitation (RIP) assay revealed Mex3a directly bound to LAMA2 mRNA and Mex3a increased the instability of LAMA2 mRNA in LUAD cells. Furthermore, we discovered that LAMA2 was surprisingly downregulated in LUAD and inhibited LUAD metastasis. LAMA2 knockdown partially reverse the decrease of cell migration and invasion caused by Mex3a knockdown. In addition, we found that both Mex3a and LAMA2 could influence PI3K-AKT pathway, which are downstream effectors of the ECM-receptor pathway. Moreover, the reduced activation of PI3K-AKT pathway in caused by Mex3a depletion was rescued by LAMA2 knockdown. In conclusion, we demonstrated that Mex3a downregulates LAMA2 expression to exert a prometastatic role in LUAD. Our study revealed the prognostic and prometastatic effects of Mex3a in LUAD, suggesting that Mex3a can serve as a prognostic biomarker and a target for metastatic therapy.
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