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Updated: Jul 18, 2026

Imaging ATG9A, a Multi-Spanning Membrane Protein
Published on: June 16, 2023
Atg9 trafficking in Mammalian cells
Jemma L Webber1, Andrew R J Young, Sharon A Tooze
1Cancer Research UK, London Research Institute, 44 Lincoln's Inn Fields, London, United Kingdom.
The study investigates the source of the pre-autophagosomal structure (PAS) membrane in mammalian cells during autophagy. Characterizing the transmembrane protein Atg9 suggests the Golgi complex is involved in autophagosome formation.
Area of Science:
- Cell Biology
- Molecular Biology
- Autophagy Research
Background:
- Autophagy is a crucial cellular degradation process.
- Autophagy-related (ATG) proteins form the pre-autophagosomal structure (PAS) in yeast.
- The origin of the PAS membrane and autophagosome formation in mammalian cells remain unclear.
Purpose of the Study:
- To investigate the source of the PAS membrane in mammalian cells.
- To explore the role of the transmembrane protein Atg9 in autophagy.
- To understand membrane trafficking events during starvation-induced autophagy.
Main Methods:
- Characterization of mammalian Atg9 (mAtg9) trafficking.
- Analysis of Golgi complex involvement in autophagy.
- Investigating membrane trafficking in response to starvation.
Main Results:
- Mammalian Atg9 (mAtg9) traffics between the Golgi and endosomes.
- Evidence suggests the Golgi complex plays a role in autophagic pathways.
- The study provides insights into membrane dynamics during starvation.
Conclusions:
- The Golgi complex is implicated in the biogenesis of autophagosomes.
- Atg9's trafficking patterns offer clues to the PAS origin.
- Further research can elucidate the complete mechanism of autophagosome formation.
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