AbstractIn the mammalian developmental process, the segmentation clock and circadian clock appear sequentially in the embryo. However, there is no clear information about the biological significance of the mutual exclusiveness of these rhythms. Here we show that excess of the circadian components CLOCK/BMAL1 in mouse embryonic organoids, induced presomitic mesoderm and gastruloids, disrupts the Hes7 ultradian rhythm and somitogenesis. RNA sequencing analysis showed that CLOCK/BMAL1 activates the signaling pathways regulating Hes7. After establishment of the circadian clock, the expression of endogenous Hes7 and another segmentation clock gene, Lfng, tended to fluctuate with a circadian period, implying that the circadian clock potentially interferes with the segmentation clock. These results suggest that strict timing regulation of the emergence of circadian clock oscillation is essential for mammalian development.Competing Interest StatementThe authors have declared no competing interest.
Erratum regarding missing Declaration of Competing Interest statement in previously published article
