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- W1433152810 startingPage "173" @default.
- W1433152810 abstract "Animal appendages require a proximodistal (PD) axis, which forms orthogonally from the two main body axes, anteroposterior and dorsoventral. In this review, we discuss recent advances that begin to provide insights into the molecular mechanisms controlling PD axis formation in the Drosophila leg. In this case, two morphogens, Wingless (Wg) and Decapentaplegic (Dpp), initiate a genetic cascade that, together with growth of the leg imaginal disc, establishes the PD axis. The analysis of cis-regulatory modules (CRMs) that control the expression of genes at different positions along the PD axis has been particularly valuable in dissecting this complex process. From these experiments, it appears that only one concentration of Wg and Dpp are required to initiate PD axis formation by inducing the expression of Distal-less (Dll), a homeodomain-encoding gene that is required for leg development. Once Dll is turned on, it activates the medially expressed gene dachshund (dac). Cross-regulation between Dll and dac, together with cell proliferation in the growing leg imaginal disc, results in the formation of a rudimentary PD axis. Wg and Dpp also initiate the expression of ligands for the EGFR pathway, which in turn induces the expression of a series of target genes that pattern the distal-most portion of the leg." @default.
- W1433152810 created "2016-06-24" @default.
- W1433152810 creator A5022956981 @default.
- W1433152810 creator A5052343704 @default.
- W1433152810 creator A5054313712 @default.
- W1433152810 date "2012-01-01" @default.
- W1433152810 modified "2023-10-11" @default.
- W1433152810 title "A Dynamic Network of Morphogens and Transcription Factors Patterns the Fly Leg" @default.
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