miR-137 conferred robustness to the territorial restriction of the neural plate border
Scatturice, L. A.; Vazquez, N.; Strobl-Mazzulla, P. H.
Show abstract
The neural plate border (NPB) of vertebrate embryos segregated from the neural plate (NP) and epidermal regions, and comprised an intermingled group of progenitors with multiple fate potential. Recent studies have shown that during the gastrula stage, TFAP2A acts as a pioneer factor in remodeling the epigenetic landscape required to activate components of the NPB induction program. Here we show that Tfap2a has two highly conserved binding sites for miR-137 and both display a reciprocal expression pattern at the NPB and NP respectively. In addition, ectopic miR-137 expression reduced TFAP2A, whereas its functional inhibition expanded their territorial distribution overlapping with PAX7. Furthermore, we demonstrated that loss of the de novo DNA methyltransferase DNMT3A expanded miR-137 expression to the NPB. Bisulfite sequencing showed a significantly higher level of non-canonical CpH methylation at the promoter of miR-137 when we compared NPB and NP samples. Our finding shows that miR-137 contributes to the robustness of NPB territorial restriction in vertebrate development.
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