Extracellular signals responsible for spatially regulated proliferation in the differentiating Drosophila eye - PubMed (original) (raw)
Extracellular signals responsible for spatially regulated proliferation in the differentiating Drosophila eye
Lucy C Firth et al. Dev Cell. 2005 Apr.
Free article
Erratum in
- Dev Cell. 2005 Jun;8(6):972
Abstract
Spatially and temporally choreographed cell cycles accompany the differentiation of the Drosophila retina. The extracellular signals that control these patterns have been identified through mosaic analysis of mutations in signal transduction pathways. All cells arrest in G1 prior to the start of neurogenesis. Arrest depends on Dpp and Hh, acting redundantly. Most cells then go through a synchronous round of cell division before fate specification and terminal cell cycle exit. Cell cycle entry is induced by Notch signaling and opposed in subsets of cells by EGF receptor activity. Unusually, Cyclin E levels are not limiting for retinal cell cycles. Rbf/E2F and the Cyclin E antagonist Dacapo are important, however. All retinal cells, including the postmitotic photoreceptor neurons, continue dividing when rbf and dacapo are mutated simultaneously. These studies identify the specific extracellular signals that pattern the retinal cell cycles and show how differentiation can be uncoupled from cell cycle exit.
Comment in
- Cell-cycle control during development: taking it up a notch.
Thomas BJ. Thomas BJ. Dev Cell. 2005 Apr;8(4):451-2. doi: 10.1016/j.devcel.2005.03.013. Dev Cell. 2005. PMID: 15809024
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