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SMPD1 mutations, activity, and α-synuclein accumulation in Parkinson's disease
Roy N Alcalay1,2, Victoria Mallett3, Benoît Vanderperre4
1Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, NY, USA.
Movement Disorders : Official Journal of the Movement Disorder Society
|February 22, 2019
Summary
Genetic variants in SMPD1 (acid-sphingomyelinase) are linked to Parkinson's disease (PD). Reduced acid-sphingomyelinase activity may increase alpha-synuclein, a key protein implicated in PD pathogenesis.
Area of Science:
- Genetics and Neurodegenerative Diseases
- Biochemistry and Molecular Biology
Background:
- Recent studies suggest a link between SMPD1 (acid-sphingomyelinase) variants and Parkinson's disease (PD).
- Investigating the specific role of SMPD1 mutations in PD pathogenesis is crucial for understanding disease mechanisms.
Purpose of the Study:
- To investigate the association between SMPD1 variants and Parkinson's disease.
- To explore the functional consequences of SMPD1 mutations on acid-sphingomyelinase activity and alpha-synuclein levels.
Main Methods:
- Sequencing of SMPD1 in three independent cohorts comprising 1592 PD patients and 975 controls.
- Measurement of acid-sphingomyelinase activity using mass spectrometry.
- In vitro assessment of alpha-synuclein levels following SMPD1 manipulation (CRISPR/Cas9 knockout and siRNA knockdown) in cell lines.
Main Results:
- SMPD1 mutations (p.L302P, p.fsP330) were significantly associated with PD in the Ashkenazi Jewish cohort.
- Reduced acid-sphingomyelinase activity correlated with an earlier onset of PD.
- SMPD1 deficiency led to increased alpha-synuclein levels and impaired lysosomal trafficking of acid-sphingomyelinase.
Conclusions:
- The study supports a significant association between SMPD1 variants, altered acid-sphingomyelinase activity, and Parkinson's disease.
- Reduced acid-sphingomyelinase activity is implicated as a potential mechanism contributing to alpha-synuclein accumulation in PD.