Related Experiment Video
Updated: Aug 16, 2026
06:52
Behavioral and Locomotor Measurements Using an Open Field Activity Monitoring System for Skeletal Muscle Diseases
Published on: September 29, 2014
Limb-girdle muscular dystrophy in childhood
1Division of Neurology and Neuromuscular Program, The Children's Hospital of Philadelphia, Philadelphia, PA, USA. bonnemann@email.chop.edu
Pediatric Annals
|August 12, 2005
Summary
Limb-girdle muscular dystrophy (LGMD) is a group of genetic muscle disorders. Precise genetic diagnosis is crucial for patient counseling, predicting risks like cardiomyopathy, and accessing targeted therapies.
Area of Science:
- Genetics
- Neurology
- Muscular Dystrophy Research
Background:
- Limb-girdle muscular dystrophy (LGMD) encompasses a heterogeneous group of inherited muscle disorders.
- LGMD affects proximal muscles and presents in both autosomal recessive and dominant forms.
- Autosomal recessive LGMD forms are more prevalent and generally more severe than dominant forms.
Purpose of the Study:
- To emphasize the importance of specific genetic diagnosis in LGMD.
- To highlight the benefits of precise diagnosis for genetic counseling and risk prediction.
- To underscore the need for targeted treatments becoming available for LGMD.
Main Methods:
- Clinical feature assessment.
- Expert analysis of muscle biopsy.
- Guided genetic testing strategies.
Main Results:
- Specific genetic diagnosis beyond a general LGMD classification is essential.
- Accurate diagnosis aids in predicting patient risks, including cardiomyopathy.
- Early and specific diagnosis facilitates the use of emerging targeted therapies.
Conclusions:
- Accurate genetic diagnosis is paramount for optimal LGMD patient management.
- A combination of clinical evaluation, muscle biopsy analysis, and genetic testing is required for definitive diagnosis.
- Advancing diagnostic precision in LGMD is key to improving patient outcomes and therapeutic options.
Related Concept Videos
01:21Satellite Stem Cells and Muscular Dystrophy
Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
01:28Disorders of the Skeletal Muscle
The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
01:26Cross-bridge Cycle
As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
01:09Changes in the Appendicular Skeleton with Age
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
01:11Alterations in Muscle Tone lll
Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...