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Basic Science and Pathogenesis.

Danyeong Kim1,2, Da-Eun Jeong1, Yunseo Gong2

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Summary
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A novel ATP10B mutation (R303W) is linked to Parkinson's disease (PD), disrupting cellular functions and increasing alpha-synuclein. This finding highlights ATP10B's role in PD pathogenesis and suggests therapeutic targets.

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • ATP10B, a phospholipid flippase, is crucial for cellular homeostasis and implicated in Parkinson's disease (PD) pathogenesis.
  • Previous research suggested a link between ATP10B dysfunction and PD, but its specific role in alpha-synuclein metabolism remained unclear.
  • A novel ATP10B R303W mutation was identified in a familial PD patient, prompting an investigation into its effects on cellular functions and alpha-synuclein.

Purpose of the Study:

  • To investigate the role of the novel ATP10B R303W mutation in Parkinson's disease (PD) pathogenesis.
  • To explore the impact of ATP10B R303W on mitochondrial and lysosomal functions.
  • To determine the effect of ATP10B R303W on alpha-synuclein metabolism and cellular processing.

Main Methods:

  • CRISPR/Cas9 technology was used to generate HEK293 cell models expressing ATP10B R303W and SNCA A53T.
  • Gene expression (ATP10B, LC3) was analyzed using RT-qPCR.
  • Alpha-synuclein levels, mitochondrial membrane potential, lysosomal pH, enzyme activity, and phagocytosis were assessed using various biochemical and imaging techniques.

Main Results:

  • Successful generation of ATP10B R303W and SNCA A53T mutations confirmed by Sanger sequencing.
  • ATP10B R303W and SNCA A53T mutations led to reduced ATP10B and LC3 gene expression.
  • Both mutations increased cytosolic and membrane-bound alpha-synuclein, reduced mitochondrial membrane potential, and impaired alpha-synuclein phagocytosis; ATP10B R303W also increased lysosomal pH and reduced enzyme activity.

Conclusions:

  • The ATP10B R303W mutation is a novel pathogenic factor associated with Parkinson's disease (PD).
  • ATP10B R303W disrupts mitochondrial and lysosomal functions, leading to altered alpha-synuclein dynamics.
  • These findings establish a direct link between ATP10B dysfunction and PD pathology, particularly in hereditary forms, suggesting ATP10B as a potential therapeutic target.