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How the Dorsal gradient works: insights from postgenome technologies Hong JW; Hendrix DA; Papatsenko D; Levine MSProc Natl Acad Sci U S A 2008[Dec]; 105 (51): 20072-6Gradients of extracellular signaling molecules and transcription factors are used in a variety of developmental processes, including the patterning of the Drosophila embryo, the establishment of diverse neuronal cell types in the vertebrate neural tube, and the anterior-posterior patterning of vertebrate limbs. Here, we discuss how a gradient of the maternal transcription factor Dorsal produces complex patterns of gene expression across the dorsal-ventral (DV) axis of the early Drosophila embryo. The identification of 60-70 Dorsal target genes, along with the characterization of approximately 35 associated regulatory DNAs, suggests that there are at least six different regulatory codes driving diverse DV expression profiles.|Animals[MESH]|Body Patterning/genetics[MESH]|Drosophila[MESH]|Drosophila Proteins/physiology[MESH]|Embryo, Nonmammalian[MESH]|Embryonic Induction[MESH]|Gene Expression Regulation, Developmental/*physiology[MESH]|Nuclear Proteins/physiology[MESH]|Phosphoproteins/physiology[MESH]|Transcription Factors/*physiology[MESH] |
