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Satellite Stem Cells and Muscular Dystrophy01:21

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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...
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Myasthenia Gravis: Diagnostic Tests01:15

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Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...
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Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
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Disorders of the Skeletal Muscle01:28

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Related Experiment Video

Updated: Jul 4, 2025

In Vivo Electrophysiological Measurement of Compound Muscle Action Potential from the Forelimbs in Mouse Models of Motor Neuron Degeneration
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Genetic Myelopathies.

Kara Stavros

    Continuum (Minneapolis, Minn.)
    |February 8, 2024
    PubMed
    Summary

    Genetic myelopathies are inherited spinal cord disorders. Genetic testing is crucial for diagnosis, differentiating them from acquired causes, and guiding management, with recent therapeutic advances for some conditions.

    Area of Science:

    • Neurology
    • Genetics
    • Inherited Neurological Disorders

    Background:

    • Genetic myelopathies encompass diverse inherited, degenerative spinal cord conditions.
    • These include motor neuron disorders, spinocerebellar degeneration, leukodystrophies, and hereditary spastic paraplegia.
    • Clinical examples highlight their spectrum and features distinguishing them from acquired myelopathies.

    Purpose of the Study:

    • To provide an overview of genetic myelopathies.
    • To illustrate the spectrum and diagnostic features of various genetic myelopathies.
    • To emphasize the role of genetic testing in diagnosis and management.

    Main Methods:

    • Review of genetic myelopathies, categorizing them into distinct groups.
    • Presentation of clinical examples for each category.

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  • Discussion of diagnostic approaches, including imaging and genetic testing.

    • Main Results:

    • Genetic testing significantly advances the diagnosis and counseling for genetic myelopathies.
    • While most treatments are supportive, breakthroughs exist for conditions like ALS, SMA, and Friedreich ataxia.
    • Genetic myelopathies often present with progressive symptoms, family history, and may show spinal cord atrophy on imaging.

    Conclusions:

    • Genetic testing is essential for accurate diagnosis of genetic myelopathies, especially when symptoms overlap.
    • Excluding reversible causes is a critical diagnostic step.
    • Advances in genetic testing and targeted therapies are improving patient care and counseling.