更新于：2024-05-01
Muscular Dystrophies, Limb-Girdle
肢带型肌营养不良
更新于：2024-05-01
基本信息
别名 LGMD、Leyden-Mobius muscular dystrophy、Limb Girdle Muscular Dystrophies + [43] |
简介 A heterogenous group of inherited muscular dystrophy that can be autosomal dominant or autosomal recessive. There are many forms (called LGMDs) involving genes encoding muscle membrane proteins such as the sarcoglycan (SARCOGLYCANS) complex that interacts with DYSTROPHIN. The disease is characterized by progressing wasting and weakness of the proximal muscles of arms and legs around the HIPS and SHOULDERS (the pelvic and shoulder girdles). |
关联
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作用机制 |
在研机构 |
原研机构 |
在研适应症 |
非在研适应症 |
最高研发阶段 |
首次获批国家/地区 |
首次获批日期 |
靶点 |
作用机制 |
在研机构 |
原研机构 |
在研适应症 |
非在研适应症 |
最高研发阶段 |
首次获批国家/地区 |
首次获批日期 |
靶点 |
作用机制 |
在研机构 |
原研机构 |
在研适应症 |
非在研适应症 |
最高研发阶段 |
首次获批国家/地区 |
首次获批日期 |
Phase 1/2a First-in-human Trial Evaluating Autologous Gene-edited Muscle Stem Cells in Limb Girdle Muscular Dystrophies (GenPHSats-bASKet)
A Phase 1-2, Open-label, Dose Escalation Study to Evaluate the Safety of 2 Doses of Intravenous ATA-200, an Adeno-associated Viral Vector Carrying the Human SGCG Gene, in Patients With Gamma-sarcoglycanopathy (LGMDR5)
A Prospective Longitudinal Study of Natural History and Functional Status of Patients With Gamma-sarcoglycanopathy (LGMDR5)
100 项与 肢带型肌营养不良 相关的临床结果
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100 项与 肢带型肌营养不良 相关的转化医学
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2024-03-01Experimental and therapeutic medicine
Identification and functional characterization of a novel heterozygous splice‑site mutation in the calpain 3 gene causes rare autosomal dominant limb‑girdle muscular dystrophy.
Article
作者: Bin Mao ; Jie Yang ; Xiaodong Zhao ; Xueling Jia ; Xin Shi ; Lihui Zhao ; Santasree Banerjee ; Lili Zhang ; Xiaoling Ma
Limb-girdle muscular dystrophies are a group of extremely heterogenous neuromuscular disorders that manifest with gradual and progressive weakness of both proximal and distal muscles. Autosomal dominant limb-girdle muscular dystrophy (LGMDD4) or calpainopathy is a very rare form of myopathy characterized by weakness and atrophy of both proximal and distal muscles with a variable age of onset. LGMDD4 is caused by germline heterozygous mutations of the calpain 3 (CAPN3) gene. Patients with LGMDD4 often show extreme phenotypic heterogeneity; however, most patients present with gait difficulties, increased levels of serum creatine kinase, myalgia and back pain. In the present study, a 16-year-old male patient, clinically diagnosed with LGMDD4, was investigated. The proband had been suffering from weakness and atrophy of both of their proximal and distal muscles, and had difficulty walking and standing independently. The serum creatine kinase levels (4,754 IU/l; normal, 35-232 IU/l) of the patient were markedly elevated. The younger sister and mother of the proband were also clinically diagnosed with LGMDD4, while the father was phenotypically normal. Whole exome sequencing identified a heterozygous novel splice-site (c.2440-1G>A) mutation in intron 23 of the CAPN3 gene in the proband. Sanger sequencing confirmed that this mutation was also present in both the younger sister and mother of the proband, but the father was not a carrier of this mutation. This splice-site (c.2440-1G>A) mutation causes aberrant splicing of CAPN3 mRNA, leading to the skipping of the last exon (exon 24) of CAPN3 mRNA and resulting in the removal of eight amino acids from the C-terminal of domain IV of the CAPN3 protein. Hence, this splice site mutation causes the formation of a truncated CAPN3 protein (p.Trp814*) of 813 amino acids instead of the wild-type CAPN3 protein that consists of 821 amino acids. This mutation causes partial loss of domain IV (PEF domain) in the CAPN3 protein, which is involved in calcium binding and homodimerization; therefore, this is a loss-of-function mutation. Relative expression of the mutated CAPN3 mRNA was reduced in comparison with the wild-type CAPN3 mRNA in the proband, and their younger sister and mother. This mutation was also not present in 100 normal healthy control individuals of the same ethnicity. The present study reported the first case of CAPN3 gene-associated LGMDD4 in the Chinese population.
2024-02-22Skeletal muscle
A knock down strategy for rapid, generic, and versatile modelling of muscular dystrophies in 3D-tissue-engineered-skeletal muscle.
Article
作者: Stijn L M In 't Groen ; Marnix Franken ; Theresa Bock ; Marcus Krüger ; Jessica C de Greef ; W W M Pim Pijnappel
BACKGROUND:
Human iPSC-derived 3D-tissue-engineered-skeletal muscles (3D-TESMs) offer advanced technology for disease modelling. However, due to the inherent genetic heterogeneity among human individuals, it is often difficult to distinguish disease-related readouts from random variability. The generation of genetically matched isogenic controls using gene editing can reduce variability, but the generation of isogenic hiPSC-derived 3D-TESMs can take up to 6 months, thereby reducing throughput.
METHODS:
Here, by combining 3D-TESM and shRNA technologies, we developed a disease modelling strategy to induce distinct genetic deficiencies in a single hiPSC-derived myogenic progenitor cell line within 1 week.
RESULTS:
As proof of principle, we recapitulated disease-associated pathology of Duchenne muscular dystrophy and limb-girdle muscular dystrophy type 2A caused by loss of function of DMD and CAPN3, respectively. shRNA-mediated knock down of DMD or CAPN3 induced a loss of contractile function, disruption of tissue architecture, and disease-specific proteomes. Pathology in DMD-deficient 3D-TESMs was partially rescued by a candidate gene therapy treatment using micro-dystrophin, with similar efficacy compared to animal models.
CONCLUSIONS:
These results show that isogenic shRNA-based humanized 3D-TESM models provide a fast, cheap, and efficient tool to model muscular dystrophies and are useful for the preclinical evaluation of novel therapies.
2024-02-16BMC musculoskeletal disorders
Miyoshi myopathy associated with spine rigidity and multiple contractures: a case report.
Article
作者: Sergey N Bardakov ; Angelina A Titova ; Sergey S Nikitin ; Valentin Nikitins ; Margarita O Sokolova ; Vadim A Tsargush ; Elena A Yuhno ; Oleg V Vetrovoj ; Pierre G Carlier ; Yana V Sofronova ; Аrtur А Isaev ; Roman V Deev
BACKGROUND:
Dysferlinopathy is a phenotypically heterogeneous group of hereditary diseases caused by mutations in the DYSF gene. Early contractures are considered rare, and rigid spine syndrome in dysferlinopathy has been previously reported only once.
CASE PRESENTATION:
We describe a 23-year-old patient with Miyoshi myopathy with a rigid spine and multiple contractures, a rare phenotypic variant. The disease first manifested when the patient was 13 years old, with fatigue of the gastrocnemius muscles and the development of pronounced contractures of the Achilles tendons, flexors of the fingers, and extensors of the toes, followed by the involvement of large joints and the spine. Magnetic resonance imaging revealed signs of connective tissue and fatty replacement of the posterior muscles of the thighs and lower legs. Edema was noted in the anterior and medial muscle groups of the thighs, lower legs, and the multifidus muscle of the back. Whole genome sequencing revealed previously described mutations in the DYSF gene in exon 39 (c.4282 C > T) and intron 51 (c.5785-824 C > T). An immunohistochemical analysis and Western blot showed the complete absence of dysferlin protein expression in the muscle fibers.
CONCLUSIONS:
This case expands the range of clinical and phenotypic correlations of dysferlinopathy and complements the diagnostic search for spine rigidity.
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