The measure of success: constraints, objectives, and tradeoffs in morphogen-mediated patterning.
A large, diverse, and growing number of strategies have been proposed to explain how morphogen gradients achieve robustness and precision. We argue that, to be useful, the evaluation of such strategies must take into account the constraints imposed by competing objectives and performance tradeoffs. This point is illustrated through a mathematical and computational analysis of the strategy of self-enhanced morphogen clearance. The results suggest that the usefulness of this strategy comes less from its ability to increase robustness to morphogen source fluctuations per se, than from its ability to overcome specific kinds of noise, and to increase the fraction of a morphogen gradient within which robust threshold positions may be established. This work also provides new insights into the longstanding question of why morphogen gradients show a maximum range in vivo.
Lander
Arthur D
AD
Department of Developmental and Cell Biology, University of California, Irvine, California 92697-2300, USA. adlander@uci.edu
Lo
Wing-Cheong
WC
Nie
Qing
Q
Wan
Frederic Y M
FY
D000818:Animals; D019521:Body Patterning; D015509:Developmental Biology / Q000379:methods*; D004330:Drosophila; D006801:Humans; D008954:Models, Biological; D015233:Models, Statistical; D008962:Models, Theoretical; D009024:Morphogenesis; D015398:Signal Transduction; D013269:Stochastic Processes