Rem2 GTPase controls proliferation and apoptosis of neurons during embryo development

We have recently found that Rem2 GTPase, highly expressed in human embryonic stem cells (hESC), maintains the cell cycle and controls proper differentiation towards ectoderm, suggesting a role in neuronal development. We describe here the use of the zebrafish (Danio Rerio) model to determine the physiological significance of Rem2 during embryogenesis. We show that Rem2 RNA is highly expressed in zebrafish embryos up to 2 hours of development followed by a decrease in expression until 48 hours when afterwards Rem2 is switched on again until 5 days. In situexpression analysis reveals that Rem2 is expressed exclusively in the tectum of the brain and eye of the zebrafish. Rem2 morpholino demonstrates impaired embryo development resulting in loss of neural tissue.