Abstract
The involvement of cell division in cellular differentiation has long been accepted. Cell division may be required not only for the expansion of a differentiated cell population but also for the execution of differentiation processes. Nonetheless, knowledge regarding how specific differentiation processes are controlled in a cell division-dependent manner is far from complete. Here, we determined the involvement of cell division in neuronal differentiation. We initially confirmed that cell division is an essential event for the neuronal differentiation of P19 embryonic carcinoma cells. We investigated the induction mechanisms of Tshz1, whose expression is induced by retinoic acid (RA) in a cell division-dependent manner. Promoter analysis of Tshz1 revealed a specific region required for RA-dependent transcription. A series of experiments was used to identify E2F1 as the induction factor for the RA-dependent transcription of Tshz1 We propose that E2F1 mediates neuronal differentiation in a cell division-dependent manner.
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