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Status: Bibliographieeintrag

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Verfasst von:Zielke, Norman [VerfasserIn]   i
 Kim, Kerry J. [VerfasserIn]   i
 Tran, Vuong [VerfasserIn]   i
 Shibutani, Shusaku T. [VerfasserIn]   i
 Bravo, Maria-Jose [VerfasserIn]   i
 Nagarajan, Sabarish [VerfasserIn]   i
 Straaten, Monique van [VerfasserIn]   i
 Woods, Brigitte [VerfasserIn]   i
 von Dassow, George [VerfasserIn]   i
 Rottig, Carmen [VerfasserIn]   i
 Lehner, Christian F. [VerfasserIn]   i
 Grewal, Savraj S. [VerfasserIn]   i
 Duronio, Robert J. [VerfasserIn]   i
 Edgar, Bruce [VerfasserIn]   i
Titel:Control of Drosophila endocycles by E2F and CRL4CDT2
Verf.angabe:Norman Zielke, Kerry J. Kim, Vuong Tran, Shusaku T. Shibutani, Maria-Jose Bravo, Sabarish Nagarajan, Monique van Straaten, Brigitte Woods, George von Dassow, Carmen Rottig, Christian F. Lehner, Savraj S. Grewal, Robert J. Duronio & Bruce A. Edgar
E-Jahr:2011
Jahr:30 October 2011
Umfang:5 S.
Fussnoten:Im Titel ist "CDT2" hochgestellt ; Gesehen am 19.01.2023
Titel Quelle:Enthalten in: Nature <London>
Ort Quelle:London [u.a.] : Nature Publ. Group, 1869
Jahr Quelle:2011
Band/Heft Quelle:480(2011), 7375, Seite 123-127
ISSN Quelle:1476-4687
Abstract:Endocycles are variant cell cycles comprised of DNA synthesis (S)- and gap (G)-phases but lacking mitosis. Such cycles facilitate post-mitotic growth in many invertebrate and plant cells, and are so ubiquitous that they may account for up to half the world’s biomass. DNA replication in endocycling Drosophila cells is triggered by cyclin E/cyclin dependent kinase 2 (CYCE/CDK2), but this kinase must be inactivated during each G-phase to allow the assembly of pre-Replication Complexes (preRCs) for the next S-phase. How CYCE/CDK2 is periodically silenced to allow re-replication has not been established. Here, using genetic tests in parallel with computational modelling, we show that the endocycles of Drosophila are driven by a molecular oscillator in which the E2F1 transcription factor promotes CycE expression and S-phase initiation, S-phase then activates the CRL4CDT2 ubiquitin ligase, and this in turn mediates the destruction of E2F1 (ref. 7). We propose that it is the transient loss of E2F1 during S phases that creates the window of low Cdk activity required for preRC formation. In support of this model overexpressed E2F1 accelerated endocycling, whereas a stabilized variant of E2F1 blocked endocycling by deregulating target genes, including CycE, as well as Cdk1 and mitotic cyclins. Moreover, we find that altering cell growth by changing nutrition or target of rapamycin (TOR) signalling impacts E2F1 translation, thereby making endocycle progression growth-dependent. Many of the regulatory interactions essential to this novel cell cycle oscillator are conserved in animals and plants1,2,8, indicating that elements of this mechanism act in most growth-dependent cell cycles.
DOI:doi:10.1038/nature10579
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1038/nature10579
 Volltext: https://www.nature.com/articles/nature10579
 DOI: https://doi.org/10.1038/nature10579
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Cell growth
 Cell-cycle proteins
 Transcription factors
 Ubiquitin ligases
K10plus-PPN:183153309X
Verknüpfungen:→ Zeitung

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