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Related Concept Videos

Satellite Stem Cells and Muscular Dystrophy01:21

Satellite 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...
Disorders of the Skeletal Muscle01:28

Disorders 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...
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy 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...
Alterations in Muscle Tone lll01:11

Alterations 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...
Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
Cross-bridge Cycle01:26

Cross-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.

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Related Experiment Video

Updated: Jun 21, 2026

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies
14:10

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies

Published on: January 31, 2013

[Muscular dystrophies].

E Neuen-Jacob1

  • 1Institut für Neuropathologie, Universitätsklinikum Düsseldorf, Deutschland. Neuen-Jacob@med.uni-duesseldorf.de

Der Pathologe
|August 12, 2009
PubMed
Summary
This summary is machine-generated.

Diagnosing muscular dystrophies now requires genetic analysis, moving beyond outdated methods. Advances in molecular genetics have identified over 40 distinct forms, improving classification and understanding of these complex muscle disorders.

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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

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Last Updated: Jun 21, 2026

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies
14:10

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies

Published on: January 31, 2013

Immunolabelling Myofiber Degeneration in Muscle Biopsies
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Immunolabelling Myofiber Degeneration in Muscle Biopsies

Published on: December 5, 2019

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

Published on: July 29, 2016

Area of Science:

  • Neurology
  • Genetics
  • Cell Biology

Context:

  • The diagnosis of muscular dystrophy has evolved significantly with advancements in molecular biology.
  • Understanding the genetic basis of muscle disorders is crucial for accurate classification.
  • Cytoskeleton proteins and intermediate filaments play vital roles in muscle fiber function.

Purpose:

  • To highlight the obsolescence of diagnosing muscular dystrophy without genetic analysis.
  • To explain how molecular genetics and protein research have improved muscular dystrophy classification.
  • To emphasize the clinical implications of genetic heterogeneity in muscular dystrophies.

Summary:

  • Modern muscular dystrophy diagnosis relies on identifying specific gene defects, replacing older, less precise methods.
  • Immunohistochemistry and molecular genetics have distinguished over 40 distinct muscular dystrophy subtypes based on protein defects or gene loci.
  • These subtypes correlate with specific phenotypes and underlying protein abnormalities.

Impact:

  • Improved diagnostic accuracy and classification of muscular dystrophies.
  • Recognition of the association between muscular dystrophies and cardiomyopathy, including sudden cardiac death risk.
  • Necessity for specialized centers, experienced clinicians, and regular cardiologic follow-ups for effective management.