Precision and scaling in morphogen gradient read‐out
Precision and scaling in morphogen gradient read‐out
Morphogen gradients infer cell fate as a function of cellular position. Experiments in Drosophila embryos have shown that the Bicoid (Bcd) gradient is precise and exhibits some degree of scaling. We present experimental results on the precision of Bcd target genes for embryos with a single, double or quadruple dose of bicoid demonstrating that precision is highest at mid‐embryo and position dependent, rather than gene dependent. This confirms that the major contribution to precision is achieved already at the Bcd gradient formation. Modeling this dynamic process, we investigate precision for inter‐embryo fluctuations in different parameters affecting gradient formation. Within our modeling framework, the observed precision can only be achieved by a transient Bcd profile. Studying different extensions of our modeling framework reveals that scaling is generally position dependent and decreases toward the posterior pole. Our measurements confirm this trend, indicating almost perfect scaling except for anterior most expression domains, which overcompensate fluctuations in embryo length.
- University of Lausanne Switzerland
- University Hospital of Lausanne Switzerland
- University of Zurich Switzerland
- UNIL FBM Groupe I CHUV Switzerland
- SIB Swiss Institute of Bioinformatics Switzerland
Medicine (General), Embryo, Nonmammalian, QH301-705.5, Genes, Insect, 1100 General Agricultural and Biological Sciences, Models, Biological, R5-920, SX00 SystemsX.ch, 2604 Applied Mathematics, SX15 WingX, 1300 General Biochemistry, Genetics and Molecular Biology, morphogen gradients, 2400 General Immunology and Microbiology, Report, Animals, Drosophila Proteins, Biology (General), Bicoid; Drosophila; Morphogen Gradients; Precision; Scaling; Early Drosophila Embryo; Positional Information; Bicoid Gradient; Establishment; Protein; Melanogaster; Proportions; Diffusion; Dynamics; Pattern, bicoid, Homeodomain Proteins, scaling, Gene Expression Regulation, Developmental, Drosophila melanogaster, Trans-Activators, 570 Life sciences; biology, Drosophila, precision
Medicine (General), Embryo, Nonmammalian, QH301-705.5, Genes, Insect, 1100 General Agricultural and Biological Sciences, Models, Biological, R5-920, SX00 SystemsX.ch, 2604 Applied Mathematics, SX15 WingX, 1300 General Biochemistry, Genetics and Molecular Biology, morphogen gradients, 2400 General Immunology and Microbiology, Report, Animals, Drosophila Proteins, Biology (General), Bicoid; Drosophila; Morphogen Gradients; Precision; Scaling; Early Drosophila Embryo; Positional Information; Bicoid Gradient; Establishment; Protein; Melanogaster; Proportions; Diffusion; Dynamics; Pattern, bicoid, Homeodomain Proteins, scaling, Gene Expression Regulation, Developmental, Drosophila melanogaster, Trans-Activators, 570 Life sciences; biology, Drosophila, precision
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