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Related Concept Videos

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...
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...
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...
Induced Pluripotent Stem Cells01:06

Induced Pluripotent Stem Cells

Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic cells are...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
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...

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Related Experiment Video

Updated: May 25, 2026

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
09:39

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

Published on: July 29, 2016

Increased cancer risks in myotonic dystrophy.

Aung Ko Win1, Promilla G Perattur, Jose S Pulido

  • 1Centre for Molecular, Environmental, Genetic and Analytic Epidemiology, The University of Melbourne, Parkville, Victoria, Australia.

Mayo Clinic Proceedings
|January 13, 2012
PubMed
Summary
This summary is machine-generated.

Patients with myotonic dystrophy have a significantly increased risk of thyroid cancer and choroidal melanoma. This study quantifies these risks, suggesting the need for targeted cancer surveillance in myotonic dystrophy patients.

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Area of Science:

  • Genetics and Epidemiology
  • Oncology
  • Neuromuscular Disorders

Background:

  • Myotonic dystrophy (DM) is a genetic disorder with suggested links to increased cancer risk.
  • Previous studies indicated potential associations, but specific cancer risks in DM patients remained unquantified.

Purpose of the Study:

  • To quantify the cancer risks in patients diagnosed with myotonic dystrophy (DM).
  • To compare cancer incidence in DM patients with the general population using standardized incidence ratios (SIRs).

Main Methods:

  • Retrospective analysis of a cohort of 307 myotonic dystrophy patients identified from Mayo Clinic records (1993-2010).
  • Calculation of SIRs for specific cancers and age-dependent cumulative risks using Kaplan-Meier method.

Main Results:

  • A significantly increased risk of thyroid cancer (SIR, 5.54) and choroidal melanoma (SIR, 27.54) was observed in DM patients.
  • Potential increased risks for testicular cancer (SIR, 5.09) and prostate cancer (SIR, 2.21) were noted.
  • No increased risk was found for brain, breast, colorectal, lung, renal, bladder, endometrial, ovarian cancers, lymphoma, leukemia, or multiple myeloma.

Conclusions:

  • Myotonic dystrophy patients exhibit a significantly elevated risk for thyroid cancer and choroidal melanoma.
  • A possible increased risk for testicular and prostate cancers warrants further investigation in DM populations.