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Region Hovedstaden - en del af Københavns Universitetshospital
Udgivet

Regulation of axon guidance by compartmentalized nonsense-mediated mRNA decay

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Vis graf over relationer
Growth cones enable axons to navigate toward their targets by responding to extracellular signaling molecules. Growth-cone responses are mediated in part by the local translation of axonal messenger RNAs (mRNAs). However, the mechanisms that regulate local translation are poorly understood. Here we show that Robo3.2, a receptor for the Slit family of guidance cues, is synthesized locally within axons of commissural neurons. Robo3.2 translation is induced by floor-plate-derived signals as axons cross the spinal cord midline. Robo3.2 is also a predicted target of the nonsense-mediated mRNA decay (NMD) pathway. We find that NMD regulates Robo3.2 synthesis by inducing the degradation of Robo3.2 transcripts in axons that encounter the floor plate. Commissural neurons deficient in NMD proteins exhibit aberrant axonal trajectories after crossing the midline, consistent with misregulation of Robo3.2 expression. These data show that local translation is regulated by mRNA stability and that NMD acts locally to influence axonal pathfinding.
OriginalsprogEngelsk
TidsskriftCell
Vol/bind153
Udgave nummer6
Sider (fra-til)1252-65
Antal sider14
ISSN0092-8674
DOI
StatusUdgivet - 6 jun. 2013

ID: 40038196