Download e-book for kindle: Current Topics in Developmental Biology, Vol. 11 by A.A. Moscona, Alberto Monroy (Eds.)

By A.A. Moscona, Alberto Monroy (Eds.)

ISBN-10: 0080584349

ISBN-13: 9780080584348

ISBN-10: 0121531112

ISBN-13: 9780121531119

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Extra resources for Current Topics in Developmental Biology, Vol. 11

Example text

Prepatterns can, but need not, be isomorphic to visible patterns. The formation of prepatterns and the response they elicit in the cells present problems essential to an understanding of morphogenesis. Prepatterns must be formed highly exactly to explain the reproducibility of the arising visible patterns, though their shape need not be complex. The simplest shape would be a monotonic (not necessarily linear) gradient, rendering a one-to-one correlation between concentration and position. The underlying principle was already applied by the Romans, who introduced the enumerated milestone into their road system.

48 D. Recursive and Other Types of Pattern Formation . . . . . . . 51 E. Effects of Prepatterns ................................... 52 F. Conclusions; Relation of Chemical, Physical, and 54 Mathematical Aspects of Morphogenesis ....................... Appendix: Recursive Type of Pattern Formation in Regeneration: A Catalytic Model for Gradient Discontinuity Sensing. . 56 References . 57 1. Introduction Morphogenesis of a higher organism is a complex process that we can hope to understand only as combinations of more elementary mechanisms.

Another much less trivial aspect of this thought experiment pertains to asymmetry: in regeneration of hydra sections, the direction of the new head points into the direction of the old one, and this can go on much beyond eight generations. Asymmetry and orientation are directed by the polarity of the tissue, that is by some preexisting physical asymmetries. Although there are other systems in development where the orientation of a pattern is not predictable and arises by true “symmetry breaking” due to random fluctuations, the most common case is like hydra.

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Current Topics in Developmental Biology, Vol. 11 by A.A. Moscona, Alberto Monroy (Eds.)

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