Positional information and patterning revisited
نویسندگان
چکیده
منابع مشابه
Root patterning: Does auxin provide positional cues?
Patterning of Arabidopsis roots is mediated by cell-cell interactions, information flowing from differentiated to immature cells. The plant growth regulator auxin has now been shown to be involved in organizing the distal end of the root apex, including the extent and pattern of cell division programs and specification of cell identity.
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Cells in a developing embryo have no direct way of "measuring" their physical position. Through a variety of processes, however, the expression levels of multiple genes come to be correlated with position, and these expression levels thus form a code for "positional information." We show how to measure this information, in bits, using the gap genes in the Drosophila embryo as an example. Indivi...
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In the vertebrate neural tube, regional Sonic hedgehog (Shh) signaling invokes a time- and concentration-dependent induction of six different cell populations mediated through Gli transcriptional regulators. Elsewhere in the embryo, Shh/Gli responses invoke different tissue-appropriate regulatory programs. A genome-scale analysis of DNA binding by Gli1 and Sox2, a pan-neural determinant, identi...
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A framework for the qualitative representation of positional information in a two-dimensional space is presented. Qualitative representations use discrete quantity spaces, where a particular distinction is introduced only if it is relevant to the context being modeled. This allows us to build a flexible framework that accommodates various levels of granularity and scales of reasoning. Knowledge...
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ژورنال
عنوان ژورنال: Journal of Theoretical Biology
سال: 2011
ISSN: 0022-5193
DOI: 10.1016/j.jtbi.2010.10.034