Related Experiment Video

Updated: Aug 21, 2026

Myo-mechanical Analysis of Isolated Skeletal Muscle
08:42

Myo-mechanical Analysis of Isolated Skeletal Muscle

Published on: February 22, 2011

Myotonia and muscle contractile properties in mice with SIX5 deficiency

Kirkwood E Personius1, Joyti Nautiyal, Sita Reddy

  • 1Department of Exercise and Nutrition Sciences, School of Public Health and Health Professions, University at Buffalo, Kimball Tower Room 405, 3435 Main Street, Buffalo, New York 14214-3079, USA. kep7@buffalo.edu

Muscle & Nerve
|November 13, 2004
PubMed

Insights

Myotonic dystrophy type 1 (DM1) is a genetic disorder. SIX5 gene deficiency in mice did not affect muscle function, suggesting other factors contribute to DM1 muscle weakness.

Area of Science:

  • Genetics and Molecular Biology
  • Neuromuscular Disorders

Background:

  • Myotonic dystrophy (DM1) is an inherited disorder affecting multiple body systems.
  • SIX5 gene mutations are implicated in some DM1 features like cataracts and heart issues.

Purpose of the Study:

  • To investigate the role of SIX5 deficiency in skeletal muscle function.
  • To understand the implications for Myotonic dystrophy type 1 pathogenesis.

Main Methods:

  • Analysis of muscle contractile properties in SIX5 deficient mice.
  • Electromyographic assessment of muscle activity.
  • Histological examination of muscle tissue.

Main Results:

  • SIX5 deficient mice exhibited normal muscle contractile properties.
  • Electromyography showed no abnormalities in muscle activity.
  • Muscle histology remained normal in the absence of SIX5.

Conclusions:

  • SIX5 deficiency does not appear to directly cause muscle dysfunction in mice.
  • These findings suggest that other genetic or molecular mechanisms are responsible for muscle weakness in DM1.

More Related Videos

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies14:10

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

Published on: January 31, 2013

Characterization of Neuromuscular Junctions in Mice by Combined Confocal and Super-Resolution Microscopy11:03

Characterization of Neuromuscular Junctions in Mice by Combined Confocal and Super-Resolution Microscopy

Published on: December 8, 2021

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...
Muscle Contraction01:10

Muscle Contraction

In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive muscle...
Muscle Contraction01:15

Muscle Contraction

Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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...