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Parkinson Disease l: Introduction

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...

Parkinson's Disease: Treatment

Parkinson's Disease: Treatment

Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...

Parkinson's Disease: Overview

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...

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...

Parkinson Disease ll: Pathophysiology

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...

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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Updated: May 11, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

Published on: July 24, 2019

Non-Parkinson movement disorders: Five new things.

Mark S Ledoux¹

¹Department of Neurology, University of Tennessee Health Science Center, Memphis.

Neurology. Clinical Practice

|May 2, 2013

Summary

This summary is machine-generated.

Recent advances in movement disorder research are rapidly identifying genetic causes for conditions like paroxysmal kinesigenic dyskinesias and cervical dystonia. Promising new treatments are emerging for autoimmune encephalitis and essential tremor.

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Last Updated: May 11, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

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Published on: May 31, 2016

Area of Science:

Neuroscience
Genetics
Neurology

Background:

Movement disorders encompass a range of debilitating conditions with complex etiologies.
Identifying specific genetic mutations and underlying cellular mechanisms is crucial for understanding disease pathobiology.
Advances in neuroimaging and surgical techniques offer new therapeutic avenues.

Purpose of the Study:

To summarize recent breakthroughs in understanding the genetic basis of movement disorders.
To highlight emerging and effective treatment strategies for various movement disorder syndromes.
To underscore the accelerating pace of discovery in non-Parkinsonian movement disorders.

Main Methods:

Genetic analysis to identify mutations in genes such as PRRT2 and CIZ1.
Cellular studies investigating endoplasmic reticulum modeling and membrane trafficking in hereditary spastic paraplegia.
Clinical trials and application of advanced neuroimaging for treatment development.

Main Results:

Loss-of-function mutations in PRRT2 are linked to paroxysmal kinesigenic dyskinesias.
CIZ1 mutations are identified in a subset of cervical dystonia patients.
Progress in understanding hereditary spastic paraplegia pathobiology and new treatments for autoimmune encephalitis and essential tremor.

Conclusions:

The genetic landscape of movement disorders is becoming clearer, with specific genes implicated in various conditions.
Novel therapeutic approaches, including focused ultrasound and improved surgical targeting, are showing promise.
The field is rapidly advancing towards definitive etiologies and effective treatments for non-Parkinsonian movement disorders.