Spatial Bistability Generates hunchback Expression Sharpness in the Drosophila Embryo
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چکیده
منابع مشابه
Spatial Bistability Generates hunchback Expression Sharpness in the Drosophila Embryo
During embryonic development, the positional information provided by concentration gradients of maternal factors directs pattern formation by providing spatially dependent cues for gene expression. In the fruit fly, Drosophila melanogaster, a classic example of this is the sharp on-off activation of the hunchback (hb) gene at midembryo, in response to local concentrations of the smooth anterior...
متن کاملPrecision of Hunchback Expression in the Drosophila Embryo
Activation of the gap gene hunchback (hb) by the maternal Bicoid gradient is one of the most intensively studied gene regulatory interactions in animal development. Most efforts to understand this process have focused on the classical Bicoid target enhancer located immediately upstream of the P2 promoter. However, hb is also regulated by a recently identified distal shadow enhancer as well as a...
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Hunchback (Hb) is a bifunctional transcription factor that activates and represses distinct enhancers. Here, we investigate the hypothesis that Hb can activate and repress the same enhancer. Computational models predicted that Hb bifunctionally regulates the even-skipped (eve) stripe 3+7 enhancer (eve3+7) in Drosophila blastoderm embryos. We measured and modeled eve expression at cellular resol...
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Novel patterns of engrailed RNA were observed in early Drosophila embryos injected with cycloheximide, an inhibitor of protein synthesis. From these patterns, we infer that there are several superimposed systems of spatial regulation which in combination localize engrailed expression in the embryo. Activation of engrailed transcription progresses with an anterior-to-posterior polarity. Superimp...
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The subdivision of the anterior-posterior axis in Drosophila is achieved by a cascade of spatially regulated transcription factors which form short-range gradients at the syncytial blastoderm stage. These factors are assumed to have concentration-dependent regulatory effects on their target genes. However, there is so far little direct in vivo evidence that a single factor can autonomously acti...
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ژورنال
عنوان ژورنال: PLoS Computational Biology
سال: 2008
ISSN: 1553-7358
DOI: 10.1371/journal.pcbi.1000184