The results of transcriptomic profiling in Sox2 mutant and wild-type zebrafish. (A) The Venn chart in the control and Sox2 knockout treatment group. Differently continuous change types are displayed, red/green arrow means a gene up-/down-regulation at the time point. The expression correlation between Sox2 and differentially expressed genes (DEGs) at 32 h (B) and 48 h (C); in the networks, the green node represents down-regulated DEGs and the red node represents up-regulated DEGs; moreover, all the DEGs were classified into different groups based on biological function. (D) Effects of Sox2 deficiency on the expressions of two motor neuron regulation-related genes. Experimental embryos were sampled at 12, 24, and 48 hpf (n = 12). Each bar represents the mean ± SD. Values with *, ** and *** above the bars are significantly different (P < 0.05, P < 0.01 and P < 0.001, respectively).