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

Autophagy
Patricia RichardJames L Manley

Abstract

SETX (senataxin) is an RNA/DNA helicase that has been implicated in transcriptional regulation and the DNA damage response through resolution of R-loop structures. Mutations in SETX result in either of two distinct neurodegenerative disorders. SETX dominant mutations result in a juvenile form of amyotrophic lateral sclerosis (ALS) called ALS4, whereas recessive mutations are responsible for ataxia called ataxia with oculomotor apraxia type 2 (AOA2). How mutations in the same protein can lead to different phenotypes is still unclear. To elucidate AOA2 disease mechanisms, we first examined gene expression changes following SETX depletion. We observed the effects on both transcription and RNA processing, but surprisingly observed decreased R-loop accumulation in SETX-depleted cells. Importantly, we discovered a strong connection between SETX and the macroautophagy/autophagy pathway, reflecting a direct effect on transcription of autophagy genes. We show that SETX depletion inhibits the progression of autophagy, leading to an accumulation of ubiquitinated proteins, decreased ability to clear protein aggregates, as well as mitochondrial defects. Analysis of AOA2 patient fibroblasts also revealed a perturbation of the autophagy pathw...Continue Reading

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Citations

Mar 2, 2021·Neural Regeneration Research·Patricia Richard, Emanuel Rosonina
Mar 4, 2021·Trends in Biochemical Sciences·Martin DutertreStéphan Vagner

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Datasets Mentioned

BETA
GTX129710
GSE135349
GSE145677

Methods Mentioned

BETA
PCR
X-ray
transfection
RNA-seq
DRIP-seq
SMA
lipidation
ChIP

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