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Related Concept Videos

Parkinson Disease ll: Pathophysiology01:24

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...
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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...
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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...
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Olfactory Assays for Mouse Models of Neurodegenerative Disease
07:27

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Published on: August 25, 2014

Olfactory dysfunction in Parkinsonism caused by PINK1 mutations.

Alessandro Ferraris1, Tamara Ialongo, Giulio Cesare Passali

  • 1CSS-Mendel Institute, Casa Sollievo della Sofferenza Hospital, Rome, Italy.

Movement Disorders : Official Journal of the Movement Disorder Society
|November 6, 2009
PubMed
Summary

Olfactory dysfunction, or hyposmia, is common in Parkinson's disease (PD) and PINK1-related Parkinsonism. Even asymptomatic carriers of PINK1 mutations show olfactory deficits, suggesting early neurodegeneration.

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Area of Science:

  • Neuroscience
  • Genetics
  • Neurology

Background:

  • Olfactory dysfunction is a common nonmotor symptom in Parkinson's disease (PD).
  • Olfactory deficits have been observed in various monogenic forms of Parkinsonism.
  • PINK1 mutations are a known cause of monogenic Parkinsonism.

Purpose of the Study:

  • To investigate olfactory dysfunction in individuals with PINK1-related Parkinsonism.
  • To compare olfactory deficits in sporadic PD, PINK1 mutations, and healthy controls.
  • To explore olfactory changes in asymptomatic PINK1 heterozygous carriers.

Main Methods:

  • Evaluated olfactory detection threshold, odor discrimination, and odor identification.
  • Compared five groups: sporadic PD, PINK1 homozygous, PINK1 heterozygous, asymptomatic PINK1 heterozygous carriers, and healthy controls.
  • Utilized olfactory testing on a cohort of 111 subjects.

Main Results:

  • All affected subjects and most healthy heterozygotes exhibited hyposmia.
  • PINK1 mutation carriers showed more impaired odor discrimination than sporadic PD.
  • Asymptomatic PINK1 heterozygotes displayed milder olfactory deficits, primarily in discrimination.
  • Odor identification was impaired in nearly all patients, regardless of PD or PINK1 status.

Conclusions:

  • Olfactory dysfunction is prevalent in PINK1-related Parkinsonism, characterized by impaired odor identification and discrimination.
  • Milder olfactory deficits in asymptomatic PINK1 heterozygotes may indicate preclinical neurodegeneration.
  • Olfactory testing can aid in understanding the progression of Parkinson's disease and related genetic forms.