Notch and Prospero repress proliferation following cyclin E overexpression in the Drosophila bristle lineage.
Understanding the mechanisms that coordinate cell proliferation, cell cycle arrest, and cell differentiation is essential to address the problem of how "normal" versus pathological developmental processes take place. In the bristle lineage of the adult fly, we have tested the capacity of post-mitotic cells to re-enter the cell cycle in response to the overexpression of cyclin E. We show that only terminal cells in which the identity is independent of Notch pathway undergo extra divisions after CycE overexpression. Our analysis shows that the responsiveness of cells to forced proliferation depends on both Prospero, a fate determinant, and on the level of Notch pathway activity. Our results demonstrate that the terminal quiescent state and differentiation are regulated by two parallel mechanisms acting simultaneously on fate acquisition and cell cycle progression.
Simon
Françoise
F
Université Pierre et Marie Curie-Paris 6, UMR 7622, Paris, France.
Fichelson
Pierre
P
Gho
Michel
M
Audibert
Agnès
A
D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D049109:Cell Proliferation; D019927:Cyclin E / Q000235:genetics / Q000378:metabolism*; D015536:Down-Regulation; D004330:Drosophila / Q000166:cytology / Q000235:genetics / Q000378:metabolism*; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D051880:Receptors, Notch / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
D019927:Cyclin E; D029721:Drosophila Proteins; C497759:N protein, Drosophila; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D051880:Receptors, Notch; D014157:Transcription Factors; C073099:pros protein, Drosophila