A coding-independent function of an alternative Ube3a transcript during neuronal development

Nature Neuroscience
Jeremy ValluyGerhard Schratt


The E3 ubiquitin ligase Ube3a is an important regulator of activity-dependent synapse development and plasticity. Ube3a mutations cause Angelman syndrome and have been associated with autism spectrum disorders (ASD). However, the biological significance of alternative Ube3a transcripts generated in mammalian neurons remains unknown. We report here that Ube3a1 RNA, a transcript that encodes a truncated Ube3a protein lacking catalytic activity, prevents exuberant dendrite growth and promotes spine maturation in rat hippocampal neurons. Surprisingly, Ube3a1 RNA function was independent of its coding sequence but instead required a unique 3' untranslated region and an intact microRNA pathway. Ube3a1 RNA knockdown increased activity of the plasticity-regulating miR-134, suggesting that Ube3a1 RNA acts as a dendritic competing endogenous RNA. Accordingly, the dendrite-growth-promoting effect of Ube3a1 RNA knockdown in vivo is abolished in mice lacking miR-134. Taken together, our results define a noncoding function of an alternative Ube3a transcript in dendritic protein synthesis, with potential implications for Angelman syndrome and ASD.


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