Abstract
Cell culture work has identified the tumor suppressor p53 as a component of the S-phase checkpoint control system, while in vivo studies of this role of p53 in whole-vertebrate systems were limited. Here, we describe zebrafish mutants in the DNA polymerase delta catalytic subunit 1, based on the positional cloning of the flathead (fla) gene. fla mutants display specific defects in late proliferative zones, such as eyes, brain and cartilaginous elements of the visceral head skeleton, where cells display compromised DNA replication, followed by apoptosis, and partial or complete loss of affected tissues. Antisense-mediated knockdown of p53 in fla mutants leads to a striking rescue of all phenotypic traits, including completion of replication, survival of cells, and normal differentiation and tissue formation. This indicates that under replication-compromised conditions, the p53 branch of the S-phase checkpoint is responsible for eliminating stalled cells that, given more time, would have otherwise finished their normal developmental program.
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Accession codes
Abbreviations
- AP:
-
anterior–posterior
- ATR:
-
Ataxia telangiectasia mutated (ATM) and Rad3 related
- BrdU:
-
5′ Bromo-2′desoxyuridine
- Chk1:
-
checkpoint kinase 1
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- dpf:
-
days postfertilization
- ef1α:
-
elongation factor 1 alpha
- FACS:
-
fluorescence-activated cell sorting
- fla:
-
flathead mutant
- hpf:
-
hours postfertilization
- MO:
-
morpholino oligonucleotide
- pcna:
-
proliferating-cell nuclear antigen
- polδ1:
-
DNA polymerase delta1
- RT-PCR:
-
polymerase chain reaction after reverse transcription of RNA
- SSLP:
-
simple sequence length polymorphism
- TGFβ:
-
transforming growth factor beta
- TUNEL:
-
terminal desoxynucleotidyl transferase-mediated biotinylated UTP nick end labeling
- 4mm:
-
four mismatch control
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Acknowledgements
We thank M Nowak and T Schilling for stimulating discussions, Soojin Ryu and Wolfgang Driever for communicating unpublished results, F van Eeden (pcna), Robert Kelsh (sox9) and Marc Ekker (dlx2) for reagents, and HG Fronhoefer from the Tuebingen stock center for fla mutant fish. NP is grateful to the Alexander von Humboldt Foundation and to EMBO for her long-term postdoctoral fellowships. Work in MH's laboratory was supported by the Max-Planck Society.
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Plaster, N., Sonntag, C., Busse, C. et al. p53 deficiency rescues apoptosis and differentiation of multiple cell types in zebrafish flathead mutants deficient for zygotic DNA polymerase δ1. Cell Death Differ 13, 223–235 (2006). https://doi.org/10.1038/sj.cdd.4401747
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DOI: https://doi.org/10.1038/sj.cdd.4401747
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