Abstract：
:Axon pruning by degeneration remodels exuberant axonal connections and is widely required for the development of proper circuitry in the nervous system from insects to mammals. Developmental axon degeneration morphologically resembles injury-induced Wallerian degeneration, suggesting similar underlying mechanisms. As previously reported for mice, we show that Wlds protein substantially delays Wallerian degeneration in flies. Surprisingly, Wlds has no effect on naturally occurring developmental axon degeneration in flies or mice, although it protects against injury-induced degeneration of the same axons at the same developmental age. By contrast, the ubiquitin-proteasome system is intrinsically required for both developmental and injury-induced axon degeneration. We also show that the glial cell surface receptor Draper is required for efficient clearance of axon fragments during developmental axon degeneration, similar to its function in injury-induced degeneration. Thus, mechanistically, naturally occurring developmental axon pruning by degeneration and injury-induced axon degeneration differ significantly in early steps, but may converge onto a common execution pathway.
journal_name
Neuronjournal_title
Neuronauthors
Hoopfer ED,McLaughlin T,Watts RJ,Schuldiner O,O'Leary DD,Luo Ldoi
10.1016/j.neuron.2006.05.013subject
Has Abstractpub_date
2006-06-15 00:00:00pages
883-95issue
6eissn
0896-6273issn
1097-4199pii
S0896-6273(06)00380-1journal_volume
50pub_type
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