Microtubules coordinate with actin assembly and disassembly to elongate cortical actin cables

Disrupting the microtubule network in Drosophila nurse cells causes cortical actin cables to detach and become cytoplasmic, with their later shrinkage or stability depending on the MT manipulation.

• Why it matters: How actin cables elongate persistently while assembling, bundling, and turning over at the cortex is not well understood, especially how microtubules regulate these dynamics.
• What they did: The study perturbed the developmentally regulated microtubule network during Drosophila oogenesis and tracked whether detached cables shrank or maintained length, linking outcomes to a regulated balance of filament assembly versus disassembly.
• The result: Persistent cortical continuity and cable elongation require an imbalance that favors assembly over disassembly; promoting disassembly led to detachment and shrinkage, while reducing disassembly allowed cytoplasmic elongation, with assembly/disassembly at barbed-ends protected by Capping Protein.

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