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SETX (senataxin), the helicase mutated in AOA2 and ALS4, functions in autophagy regulation

Patricia Richard1,2, Shuang Feng, Yueh-Lin Tsai1

  • 1Department of Biological Sciences, Columbia University, New York, NY, USA.

Autophagy
|July 21, 2020
PubMed

Insights

Senataxin (SETX) regulates autophagy, a cellular cleaning process. SETX depletion impairs autophagy, leading to protein aggregate buildup and cellular defects, offering new therapeutic avenues for ataxia with oculomotor apraxia type 2 (AOA2).

Area of Science:

  • Molecular Biology
  • Neurogenetics
  • Cellular Biology

Background:

  • Senataxin (SETX) is an RNA/DNA helicase involved in transcriptional regulation and DNA damage response.
  • Mutations in SETX cause neurodegenerative disorders: ALS4 (dominant) and AOA2 (recessive).
  • The distinct phenotypes arising from SETX mutations remain incompletely understood.

Purpose of the Study:

  • To elucidate the disease mechanisms underlying ataxia with oculomotor apraxia type 2 (AOA2).
  • To investigate the role of SETX in cellular processes beyond R-loop resolution.
  • To identify novel functions of SETX relevant to neurodegeneration.

Main Methods:

  • Gene expression analysis following SETX depletion.
  • Investigation of R-loop accumulation dynamics.
  • Assessment of the macroautophagy/autophagy pathway.
  • Analysis of autophagy gene transcription.
  • Examination of protein aggregate clearance and mitochondrial function.
  • Study of AOA2 patient-derived fibroblasts.

Main Results:

  • SETX depletion surprisingly decreased R-loop accumulation.
  • A significant connection between SETX and the autophagy pathway was discovered.
  • SETX directly impacts the transcription of autophagy genes.
  • SETX depletion inhibited autophagy progression, causing accumulation of ubiquitinated proteins and impaired aggregate clearance.
  • Mitochondrial defects were observed in SETX-depleted cells.
  • AOA2 patient fibroblasts exhibited perturbed autophagy.

Conclusions:

  • SETX plays a novel and critical role in regulating the autophagy pathway.
  • Dysregulation of autophagy due to SETX dysfunction contributes to AOA2 pathogenesis.
  • Modulating the autophagy pathway presents a potential therapeutic strategy for AOA2.
Keywords:
AOA2DRIPLC3R loopR-loopSETXautophagylysosomal degradationsenataxintranscription regulation

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