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Mitotic spindle orientation can direct cell fate and bias Notch activity in chick neural tube

Mitotic spindle orientation can direct cell fate and bias Notch activity in chick neural tube

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Original languageEnglish
Pages448-454
Number of pages7
JournalEMBO Reports
Journal publication dateMay 2012
Journal number5
Volume13
DOIs
StatePublished

Abstract

Inheritance of apical membrane is proposed to maintain vertebrate neural stem cell proliferation. However, evidence for this is contradictory. Using direct clonal analysis and live imaging in chick neural tube, we show that divisions that separate apical and basal components generate an apical daughter, which becomes a neuron, and a basal daughter, which rapidly re-establishes apico-basal polarity and divides again. Using a recently described real-time reporter of Notch activity, we confirm progenitor status and demonstrate that division orientation can influence Notch signalling. In addition, we reveal loss of apical complex proteins on neuronal differentiation onset, suggesting that removal of this inherited complex is part of the neuronal differentiation mechanism. These findings reconcile contradictory data, link asymmetric division to Notch signalling dynamics and identify apical complex loss as a new step towards neuronal differentiation.

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