Drosophila double-parked is sufficient to induce re-replication during development and is regulated by cyclin E/CDK2.
It is important that chromosomes are duplicated only once per cell cycle. Over-replication is prevented by multiple mechanisms that block the reformation of a pre-replicative complex (pre-RC) onto origins in S and G2 phase. We have investigated the developmental regulation of Double-parked (Dup) protein, the Drosophila ortholog of Cdt1, a conserved and essential pre-RC component found in human and other organisms. We find that phosphorylation and degradation of Dup protein at G1/S requires cyclin E/CDK2. The N terminus of Dup, which contains ten potential CDK phosphorylation sites, is necessary and sufficient for Dup degradation during S phase of mitotic cycles and endocycles. Mutation of these ten phosphorylation sites, however, only partially stabilizes the protein, suggesting that multiple mechanisms ensure Dup degradation. This regulation is important because increased Dup protein is sufficient to induce profound rereplication and death of developing cells. Mis-expression has different effects on genomic replication than on developmental amplification from chorion origins. The C terminus alone has no effect on genomic replication, but it is better than full-length protein at stimulating amplification. Mutation of the Dup CDK sites increases genomic re-replication, but is dominant negative for amplification. These two results suggest that phosphorylation regulates Dup activity differently during these developmentally specific types of DNA replication. Moreover, the ability of the CDK site mutant to rapidly inhibit BrdU incorporation suggests that Dup is required for fork elongation during amplification. In the context of findings from human and other cells, our results indicate that stringent regulation of Dup protein is critical to protect genome integrity.
Thomer
Marguerite
M
Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6145, USA.
May
Noah R
NR
Aggarwal
Bhagwan D
BD
Kwok
Garrick
G
Calvi
Brian R
BR
D000818:Animals; D030801:Animals, Genetically Modified; D042846:CDC2-CDC28 Kinases / Q000378:metabolism*; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D019927:Cyclin E / Q000378:metabolism*; D051357:Cyclin-Dependent Kinase 2; D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D005123:Eye / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D005260:Female; D005784:Gene Amplification; D017344:Genes, Insect; D009154:Mutation; D010053:Ovary / Q000166:cytology / Q000378:metabolism; D010766:Phosphorylation
D018797:Cell Cycle Proteins; D019927:Cyclin E; D004268:DNA-Binding Proteins; C411983:DUP protein, Drosophila; D029721:Drosophila Proteins; D042846:CDC2-CDC28 Kinases; D051357:Cyclin-Dependent Kinase 2; C495887:cdk2 protein, Drosophila