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Related Concept Videos

Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

634
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...
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Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

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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...
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Indication for molecular testing by multiplex ligation-dependent probe amplification in parkinsonism.

E Mutez1,2, M Swiderski2, D Devos1,2,3

  • 1Univ. Lille, Inserm, CHU Lille, U1172 - LilNCog (JPARC) - Lille Neurosciences & Cognition, Lille, France.

European Journal of Neurology
|March 14, 2023
PubMed
Summary

Multiplex ligation-dependent probe amplification (MLPA) effectively screens for genetic Parkinson's disease, identifying mutations in LRRK2, PRKN, and SNCA genes. Refined criteria like North African ancestry and early onset improve diagnostic yield for Mendelian Parkinson's disease.

Keywords:
Mendelian transmissionParkinson's diseasedementia with Lewy bodiesgenetic testingmultiple system atrophy

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Area of Science:

  • Neurogenetics
  • Molecular Diagnostics

Background:

  • Monogenic Parkinson's disease (PD) accounts for a small percentage of familial and sporadic cases.
  • Lack of clear guidelines complicates genetic testing for suspected Mendelian PD.

Purpose of the Study:

  • To evaluate multiplex ligation-dependent probe amplification (MLPA) as a primary screening tool for genetic PD.
  • To establish clinical criteria for guiding genetic diagnostic tests in Mendelian PD.

Main Methods:

  • 567 patients with parkinsonism underwent MLPA analysis.
  • LRRK2 G2019S variants were confirmed by Sanger sequencing; PRKN mutations were further investigated.

Main Results:

  • MLPA identified pathogenic variants in 9% of the cohort, including LRRK2 (4.8%), PRKN (3.4%), and SNCA duplications (0.9%).
  • Positive genetic tests were associated with North African ancestry, female sex, and younger age at onset.

Conclusions:

  • MLPA is a valuable screening test for Mendelian Parkinson's disease.
  • Clinical criteria including North African ancestry, age at onset <40 years, or family history improve diagnostic targeting.
  • MLPA is also beneficial for parkinsonism with family history, dementia with Lewy bodies, or multiple-system-atrophy-like phenotypes.