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Alterations in Muscle Tone ll

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...

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Alterations in Muscle Tone lll

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...

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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
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Related Experiment Video

Updated: Jun 20, 2026

Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia

Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia

Published on: September 12, 2020

[Genetics of dystonia].

¹Universität Rostock, Klinik und Poliklinik für Neurologie, Gehlsheimer Strasse 20, Rostock. christoph.kamm@med.unirostock.de

Fortschritte Der Neurologie-Psychiatrie

|August 18, 2009

Summary

Genetic mutations cause rare familial dystonias, a group of movement disorders. Recent research identifies 18 gene loci linked to dystonia, advancing understanding of its molecular causes.

Area of Science:

Neurology
Genetics
Molecular Biology

Context:

Dystonias are a diverse group of movement disorders.
Familial forms result from genetic mutations with Mendelian inheritance.
Sporadic forms are more common than inherited dystonias.

Purpose:

To review the progress in identifying genes causing dystonia.
To explore the molecular pathophysiology of dystonic symptoms.
To summarize current knowledge on genetic loci for primary dystonia, dystonia-plus syndromes, and paroxysmal dystonia.

Summary:

Significant advances have been made in identifying genes responsible for various dystonias.
Currently, 18 gene loci are associated with primary dystonia, dystonia-plus syndromes, and paroxysmal dystonia.

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Rapid Genotyping of Animals Followed by Establishing Primary Cultures of Brain Neurons

Rapid Genotyping of Animals Followed by Establishing Primary Cultures of Brain Neurons

Published on: January 29, 2015

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Last Updated: Jun 20, 2026

Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia

Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia

Published on: September 12, 2020

Rapid Genotyping of Animals Followed by Establishing Primary Cultures of Brain Neurons

Rapid Genotyping of Animals Followed by Establishing Primary Cultures of Brain Neurons

Published on: January 29, 2015

The most common inherited form, DYT1 dystonia, is caused by a mutation in the DYT1 (TOR1A) gene, affecting the torsinA protein's role in cytoskeletal association and neuronal development.

Impact:

Identified genes like THAP1, ATP1A3, PRKRA, and SLC2A1 provide insights into specific dystonia subtypes.
Understanding the genetic basis of dystonia facilitates diagnosis and potential therapeutic strategies.
Further research is needed to discover the genes responsible for five additional identified primary dystonia loci (DYT2, DYT4, DYT7, DYT13, DYT17).