Fig. S4 Neurog1 represses GABAergic cell fate. Mis-expression of neurog1 mRNA leads to a strong down-regulation of ascl1a expression at 28 hpf (a and b) and a down-regulation of the expression of gad1 at 32 hpf (c and d). neurog1 mRNA over-expression leads gross changes in head morphology such as the lack of optic vesicle formation. Clonally over-expression of neurog1 mRNA leads to the cell-autonomous down-regulation of shh:GFP within the MDO and tal1:GFP within the rTh (32/45; f and h; arrowheads). Control cells carrying the lineage tracer rhodamine dextran only show co-localization with the GFP markers (e and g; arrowheads). cTh, caudal thalamus; MDO, mid-diencephalic organizer; PTh, prethalamus; PTec, pretectum.
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