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Furuta M, Sumi-Akamaru H, Takahashi MP, Hayashi YK, Nishino I, Mochizuki H. An elderly-onset limb girdle muscular dystrophy type 1B (LGMD1B) with pseudo-hypertrophy of paraspinal muscles. Neuromuscul Disord 2016; 26:593-7. [PMID: 27220833 DOI: 10.1016/j.nmd.2016.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/02/2016] [Accepted: 05/02/2016] [Indexed: 10/21/2022]
Abstract
Mutations in LMNA, encoding A-type lamins, lead to diverse disorders, collectively called "laminopathies," which affect the striated muscle, cardiac muscle, adipose tissue, skin, peripheral nerve, and premature aging. We describe a patient with limb-girdle muscular dystrophy type 1B (LGMD1B) carrying a heterozygous p.Arg377His mutation in LMNA, in whom skeletal muscle symptom onset was at the age of 65 years. Her weakness started at the erector spinae muscles, which showed marked pseudo-hypertrophy even at the age of 72 years. Her first episode of syncope was at 44 years; however, aberrant cardiac conduction was not revealed until 60 years. The p.Arg377His mutation has been previously reported in several familial LMNA-associated myopathies, most of which showed muscle weakness before the 6th decade. This is the first report of pseudo-hypertrophy of paravertebral muscles in LMNA-associated myopathies. The pseudo-hypertrophy of paravertebral muscles and the elderly-onset of muscle weakness make this case unique and reportable.
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Affiliation(s)
- Mitsuru Furuta
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hisae Sumi-Akamaru
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masanori P Takahashi
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yukiko K Hayashi
- Department of Pathophysiology, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160-8402, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
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Lai CC, Yeh YH, Hsieh WP, Kuo CT, Wang WC, Chu CH, Hung CL, Cheng CY, Tsai HY, Lee JL, Tang CY, Hsu LA. Whole-exome sequencing to identify a novel LMNA gene mutation associated with inherited cardiac conduction disease. PLoS One 2013; 8:e83322. [PMID: 24349489 PMCID: PMC3861486 DOI: 10.1371/journal.pone.0083322] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 11/01/2013] [Indexed: 01/10/2023] Open
Abstract
Background Inherited cardiac conduction diseases (CCD) are rare but are caused by mutations in a myriad of genes. Recently, whole-exome sequencing has successfully led to the identification of causal mutations for rare monogenic Mendelian diseases. Objective To investigate the genetic background of a family affected by inherited CCD. Methods and Results We used whole-exome sequencing to study a Chinese family with multiple family members affected by CCD. Using the pedigree information, we proposed a heterozygous missense mutation (c.G695T, Gly232Val) in the lamin A/C (LMNA) gene as a candidate mutation for susceptibility to CCD in this family. The mutation is novel and is expected to affect the conformation of the coiled-coil rod domain of LMNA according to a structural model prediction. Its pathogenicity in lamina instability was further verified by expressing the mutation in a cellular model. Conclusions Our results suggest that whole-exome sequencing is a feasible approach to identifying the candidate genes underlying inherited conduction diseases.
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Affiliation(s)
- Chun-Chi Lai
- Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan
| | - Yung-Hsin Yeh
- First Cardiovascular Division, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Tao-Yuan, Taiwan
| | - Wen-Ping Hsieh
- Institute of Statistics, National Tsing Hua University, Hsinchu, Taiwan
| | - Chi-Tai Kuo
- First Cardiovascular Division, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Tao-Yuan, Taiwan
| | - Wen-Ching Wang
- Institute of Molecular and Cellular Biology and Department of Life Sciences, National Tsing-Hua University, Hsinchu, Taiwan
- Biomedical Science and Engineering Center, National Tsing Hua University, Hsinchu, Taiwan
| | - Chia-Han Chu
- Biomedical Science and Engineering Center, National Tsing Hua University, Hsinchu, Taiwan
| | - Chiu-Lien Hung
- Institute of Molecular and Cellular Biology and Department of Life Sciences, National Tsing-Hua University, Hsinchu, Taiwan
- Biomedical Science and Engineering Center, National Tsing Hua University, Hsinchu, Taiwan
| | - Chia-Yang Cheng
- Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan
- Biomedical Science and Engineering Center, National Tsing Hua University, Hsinchu, Taiwan
| | - Hsin-Yi Tsai
- First Cardiovascular Division, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Tao-Yuan, Taiwan
| | - Jia-Lin Lee
- Institute of Molecular and Cellular Biology and Department of Life Sciences, National Tsing-Hua University, Hsinchu, Taiwan
| | - Chuan-Yi Tang
- Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan
| | - Lung-An Hsu
- First Cardiovascular Division, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Tao-Yuan, Taiwan
- * E-mail:
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Carboni N, Mateddu A, Marrosu G, Cocco E, Marrosu MG. Genetic and clinical characteristics of skeletal and cardiac muscle in patients with lamin A/C gene mutations. Muscle Nerve 2013; 48:161-70. [PMID: 23450819 DOI: 10.1002/mus.23827] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2013] [Indexed: 12/12/2022]
Abstract
Alterations of the lamin A/C (LMNA) gene are associated with different clinical entities, including disorders that affect skeletal and cardiac muscle, peripheral nerves, metabolism, bones, and disorders that cause premature aging. In this article we review the clinical and genetic characteristics of cardiac and skeletal muscle diseases related to alterations in the LMNA gene. There is no single explanation of how LMNA gene alterations may cause these disorders; however, important goals have been achieved in understanding the pathogenic effects of LMNA gene mutations on cardiac and skeletal muscle.
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Affiliation(s)
- Nicola Carboni
- Department of Public Health, Clinical and Molecular Medicine, Multiple Sclerosis Centre, Via Is Guadazzonis 2, 09100 Cagliari, University of Cagliari, Italy.
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Scharner J, Brown CA, Bower M, Iannaccone ST, Khatri IA, Escolar D, Gordon E, Felice K, Crowe CA, Grosmann C, Meriggioli MN, Asamoah A, Gordon O, Gnocchi VF, Ellis JA, Mendell JR, Zammit PS. Novel LMNA mutations in patients with Emery-Dreifuss muscular dystrophy and functional characterization of four LMNA mutations. Hum Mutat 2011; 32:152-67. [PMID: 20848652 DOI: 10.1002/humu.21361] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Accepted: 09/01/2010] [Indexed: 12/20/2022]
Abstract
Mutations in LMNA cause a variety of diseases affecting striated muscle including autosomal Emery-Dreifuss muscular dystrophy (EDMD), LMNA-associated congenital muscular dystrophy (L-CMD), and limb-girdle muscular dystrophy type 1B (LGMD1B). Here, we describe novel and recurrent LMNA mutations identified in 50 patients from the United States and Canada, which is the first report of the distribution of LMNA mutations from a large cohort outside Europe. This augments the number of LMNA mutations known to cause EDMD by 16.5%, equating to an increase of 5.9% in the total known LMNA mutations. Eight patients presented with either p.R249W/Q or p.E358K mutations and an early onset EDMD phenotype: two mutations recently associated with L-CMD. Importantly, 15 mutations are novel and include eight missense mutations (p.R189P, p.F206L, p.S268P, p.S295P, p.E361K, p.G449D, p.L454P, and p.W467R), three splice site mutations (c.IVS4 + 1G>A, c.IVS6 - 2A>G, and c.IVS8 + 1G>A), one duplication/in frame insertion (p.R190dup), one deletion (p.Q355del), and two silent mutations (p.R119R and p.K270K). Analysis of 4 of our lamin A mutations showed that some caused nuclear deformations and lamin B redistribution in a mutation specific manner. Together, this study significantly augments the number of EDMD patients on the database and describes 15 novel mutations that underlie EDMD, which will contribute to establishing genotype-phenotype correlations.
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Affiliation(s)
- Juergen Scharner
- Randall Division of Cell and Molecular Biophysics, King's College London, United Kingdom
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Abstract
PURPOSE OF REVIEW Familial dilated cardiomyopathy is an underrecognized form of dilated cardiomyopathy. Lamin A/C deficiency is probably the most common cause of familial dilated cardiomyopathy. This review will focus on the emerging knowledge of epidemiology, diagnosis, and treatment of patients with lamin A/C deficiency, as well as possible disease mechanisms. RECENT FINDINGS Screening of patients with dilated cardiomyopathy continues to indicate that lamin A/C deficiency is a significant cause. Multiple novel mutations have been found, suggesting that many mutations are limited to individuals or families. It is unknown how mutations cause the syndrome, although an animal model has shown that lamin A/C insufficiency causes apoptosis, particularly in the conduction system. Inheritance is predominantly autosomal dominant, but penetrance is variable. For symptomatic patients, the course is malignant, with conduction system disease, atrial fibrillation, heart failure, and sudden cardiac death. The data are contradictory, and currently, there is no clear marker for when a lamin A/C-deficient patient is at risk for sudden death. SUMMARY Lamin A/C deficiency is an important cause of dilated cardiomyopathy, and diagnosis requires that clinicians have a high index of suspicion. Our knowledge of the mechanisms, diagnosis, and treatment of lamin A/C deficiency is incomplete. It is clear that patients with this condition have a malignant course and need to be followed aggressively.
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