S18-01 Scaling of morphogen gradients during embryonic development
نویسندگان
چکیده
منابع مشابه
S18-01 Scaling of morphogen gradients during embryonic development
The ability to maintain a proportionate body plan in individuals of different sizes is essential for proper development. Despite wide interest, little is known about the mechanisms underlying scaling with size. I will discuss our efforts to reveal the molecular basis for scaling in different systems. A general ‘‘Expansion– Repression’’ feedback topology will be presented, which ensures scaling ...
متن کاملScaling of morphogen gradients.
Individuals of the same or closely related species can vary substantially in size. Still, the proportions within and between tissues are precisely kept. This adaptation of pattern with size termed scaling, is receiving a growing attention. We review experimental evidence for scaling, and describe theoretical models for mechanisms that scale morphogen gradients. We particularly note the Expansio...
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Morphogens are proteins, often produced in a localized region, whose concentrations spatially demarcate regions of differing gene expression in developing embryos. The boundaries of gene expression are typically sharp and the genes can be viewed as abruptly switching from on to off or vice versa upon crossing the boundary. To ensure the viability of the organism these boundaries must be set at ...
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Activin has long-range effects in Xenopus development, inducing the mesodermally expressed brachyury gene up to 10 cell diameters from a localised source. Recent experiments show that activin diffuses through tissues to establish a morphogen gradient, and that the long-range effects are a direct result of activin signalling.
متن کاملDevelopment of Morphogen Gradients with Spatially Varying Degradation Rates.
Successful biological development via spatial and temporal regulations of cell differentiation relies on the action of multiple signaling molecules that are known as morphogens. It is now well established that biological signaling molecules create nonuniform concentration profiles, called morphogen gradients, that activate different genes, leading to patterning in the developing organisms. The ...
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ژورنال
عنوان ژورنال: Mechanisms of Development
سال: 2009
ISSN: 0925-4773
DOI: 10.1016/j.mod.2009.06.990