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A candidate loss-of-function variant in SGIP1 causes synaptic dysfunction and recessive parkinsonism.

Marianna Decet1, Patrick Scott2, Sabine Kuenen1

  • 1VIB-KU Leuven Center for Brain & Disease Research, 3000 Leuven, Belgium; KU Leuven, Department of Neurosciences, Leuven Brain Institute, 3000 Leuven, Belgium.

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|September 27, 2024
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Summary

A novel mutation in the SH3GL2 Interacting Protein 1 (SGIP1) gene is linked to early-onset parkinsonism and cognitive deficits. This discovery highlights synaptic proteostasis defects in a form of recessive parkinsonism.

Keywords:
SGIP1 variantmultivesicular bodyseizuressynaptic proteostasisyoung-onset parkinsonism

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Synaptic dysfunction is an early pathological event in parkinsonism.
  • Genetic mutations in synaptic proteins are associated with increased risk or causation of parkinsonian diseases.
  • Understanding the genetic underpinnings of parkinsonism is crucial for developing targeted therapies.

Purpose of the Study:

  • To identify the genetic cause of early-onset parkinsonism in a consanguineous Arab family.
  • To investigate the functional consequences of the identified mutation in vitro and in vivo.
  • To explore the underlying molecular mechanisms, focusing on synaptic function and proteostasis.

Main Methods:

  • Genetic analysis to identify mutations in affected family members.
  • Protein function assays to assess the impact of the SGIP1 mutation.
  • Creation and analysis of Drosophila melanogaster models to study movement, synaptic transmission, and neurodegeneration.
  • Positron Emission Tomography (PET) imaging with [18F]-fluorodeoxyglucose for metabolic network analysis.
  • Histology and correlative light and electron microscopy to examine synaptic structures.

Main Results:

  • A candidate causative mutation in the SGIP1 gene was identified in a family with early-onset parkinsonism and intellectual dysfunction.
  • The SGIP1 mutation leads to a loss of protein function.
  • Drosophila models exhibited movement deficits, impaired synaptic transmission, dopaminergic synapse loss, and neurodegeneration.
  • Absence of synaptic multivesicular bodies and accumulation of degradative organelles were observed.
  • Metabolic network analysis showed patterns similar to idiopathic Parkinson's disease.

Conclusions:

  • This study identifies a novel form of recessive parkinsonism caused by SGIP1 mutations.
  • The findings implicate defective synaptic proteostasis as a key mechanism in this form of parkinsonism.
  • This research opens new possibilities for the diagnosis, genetic counseling, and potential treatment of related disorders.