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Maturation and Clearance of Autophagosomes in Neurons Depends on a Specific Cysteine Protease Isoform, ATG-4.2.


ABSTRACT: In neurons, defects in autophagosome clearance have been associated with neurodegenerative disease. Yet, the mechanisms that coordinate trafficking and clearance of synaptic autophagosomes are poorly understood. Here, we use genetic screens and in vivo imaging in single neurons of C. elegans to identify mechanisms necessary for clearance of synaptic autophagosomes. We observed that autophagy at the synapse can be modulated in vivo by the state of neuronal activity, that autophagosomes undergo UNC-16/JIP3-mediated retrograde transport, and that autophagosomes containing synaptic material mature in the cell body. Through forward genetic screens, we then determined that autophagosome maturation in the cell body depends on the protease ATG-4.2, but not the related ATG-4.1, and that ATG-4.2 can cleave LGG-1/Atg8/GABARAP from membranes. Our studies revealed that ATG-4.2 is specifically necessary for the maturation and clearance of autophagosomes and that defects in transport and ATG-4.2-mediated maturation genetically interact to enhance abnormal accumulation of autophagosomes in neurons.

SUBMITTER: Hill SE 

PROVIDER: S-EPMC6482087 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Maturation and Clearance of Autophagosomes in Neurons Depends on a Specific Cysteine Protease Isoform, ATG-4.2.

Hill Sarah E SE   Kauffman Karlina J KJ   Krout Mia M   Richmond Janet E JE   Melia Thomas J TJ   Colón-Ramos Daniel A DA  

Developmental cell 20190314 2


In neurons, defects in autophagosome clearance have been associated with neurodegenerative disease. Yet, the mechanisms that coordinate trafficking and clearance of synaptic autophagosomes are poorly understood. Here, we use genetic screens and in vivo imaging in single neurons of C. elegans to identify mechanisms necessary for clearance of synaptic autophagosomes. We observed that autophagy at the synapse can be modulated in vivo by the state of neuronal activity, that autophagosomes undergo UN  ...[more]

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