Transcriptomic Analysis of Xenopus laevis embryo response to Anterior-Posterior Axis Rotation

This study investigates the molecular basis of developmental plasticity in Xenopus laevis embryos during a critical window between mid-gastrula (stage 11.5) and late-gastrula (stage 12.5) stages. Using comprehensive RNA-seq analysis following 180° rotation of the presumptive neural tissue, we examined transcriptional changes in embryos with differential recovery capacity. Mid-gastrula rotated embryos (70% recovery rate) exhibited more extensive transcriptional responses (923 differentially expressed genes) compared to late-gastrula rotated embryos (30% recovery rate, 559 DEGs), indicating a more robust compensatory capacity at the earlier stage. Key pathways affected included Wnt signaling, FGF signaling, and chromatin remodeling regulators, with mid-gastrula embryos showing significant upregulation of epigenetic modifiers (hdac9.L, kat2a.S) and redox-related genes (nmral1.S, gstp1.L). By developmental stage 30, mid-gastrula rotated embryos uniquely upregulated genes involved in synaptic function (syp.L, cplx1.L) and neuronal connectivity, suggesting successful reestablishment of neural circuitry. Our findings reveal that coordinated regulation of chromatin remodeling, morphogen signaling, and neuronal differentiation pathways underlies successful developmental compensation following axial perturbations, with implications for understanding neural regeneration and plasticity mechanisms in vertebrates.