Spectraplakin is required for dendritic microtubule organization via a tip-based mechanism in Drosophila.

Loss of spectraplakin Short stop (Shot) in Drosophila causes dendritic microtubule orientation defects during early dendrite development, linked to tip recruitment and local stabilization.

• Why it matters: Neurons need dendritic microtubules oriented with plus ends toward the soma, but how this polarity is established during development remains difficult to explain.
• What they did: In a Drosophila survey of cytoskeletal regulators for dendrite pruning and microtubule organization, Shot was identified; its actin-binding domain transiently recruits it to growing dendrite tips.
• The result: Genetic and functional evidence indicates Shot’s primary role is locally stabilizing microtubules, and the data also support a developmentally transient tip-based nucleation mechanism.

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