Dev Growth Differ 2017 Jan 01;591:41-51. doi: 10.1111/dgd.12337.

Scaling of pattern formations and morphogen gradients.

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The concentration gradient of morphogens provides positional information for an embryo and plays a pivotal role in pattern formation of tissues during the developmental processes. Morphogen-dependent pattern formations show robustness despite various perturbations. Although tissues usually grow and dynamically change their size during histogenesis, proper patterns are formed without the influence of size variations. Furthermore, even when the blastula embryo of Xenopus laevis is bisected into dorsal and ventral halves, the dorsal half of the embryo leads to proportionally patterned half-sized embryos. This robustness of pattern formation despite size variations is termed as scaling. In this review, I focused on the morphogen-dependent dorsal-ventral axis formation in Xenopus and described how morphogens form a proper gradient shape according to the embryo size.

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Species referenced: Xenopus laevis
Genes referenced: bmp1 bmp2 bmp4 bmp7.1 chrd ctnnb1 nog szl tll1