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Conserved role for Ataxin-2 in mediating endoplasmic reticulum dynamics
Urko Del Castillo1, Megan M Gnazzo2, Christopher G Sorensen Turpin3
1Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
Traffic (Copenhagen, Denmark)
|April 17, 2019
Summary
Ataxin-2 protein is crucial for endoplasmic reticulum (ER) structure and function. Its loss disrupts ER in developing cells and neurons, potentially explaining Spinocerebellar ataxia type-2 (SCA2) disease mechanisms.
Area of Science:
- Neurobiology
- Cell Biology
- Genetics
Background:
- Ataxin-2 is an RNA-binding protein linked to Spinocerebellar ataxia type-2 (SCA2).
- SCA2 pathology involves Purkinje neuron damage, including shrunken dendrites and abnormal axons containing endoplasmic reticulum (ER).
- The specific role of Ataxin-2 in ER function within SCA2 pathogenesis remains unclear.
Purpose of the Study:
- To investigate the conserved role of Ataxin-2 in regulating ER function and dynamics.
- To explore Ataxin-2's involvement in cellular processes during development and in neuronal contexts.
Main Methods:
- Utilized Caenorhabditis elegans (ATX-2) and Drosophila (DAtx2) models.
- Examined ER morphology and dynamics in embryonic cells, germline, oocytes, and cultured neurons.
- Performed ultrastructure analysis and observed protein localization using microscopy.
Main Results:
- Loss of ATX-2/DAtx2 caused ER collapse in embryonic cells and germline.
- Ultrastructure analysis revealed abnormal ER formations (spherical stacks, fragmented tubules).
- DAtx2 depletion in Drosophila neurons mimicked SCA2's shrunken dendritic arbor phenotype, with disrupted ER.
Conclusions:
- Ataxin-2 plays a conserved role in maintaining ER dynamics and morphology across species.
- Disrupted ER function due to Ataxin-2 dysfunction is a potential mechanism underlying SCA2.
- Findings highlight Ataxin-2's importance in neuronal health and development.
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