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Título

The CDK regulators Cdh1 and Sic1 promote efficient usage of DNA replication origins to prevent chromosomal instability at a chromosome arm

AutorAyuda-Milán, Pilar; Devesa, Fernando; Gomes, Fábia; Sequeira-Mendes, Joana ; Ávila-Zarza, Carmelo; Gómez, María ; Calzada, Arturo
Palabras claveDNA replication
Genome instability
Cell cycle regulation
Cdh1
Sic1
Fecha de publicación21-abr-2014
EditorOxford University Press
CitaciónNucleic Acids Research 42(11): 7057-7068 (2014)
ResumenRobustness and completion of DNA replication rely on redundant DNA replication origins. Reduced efficiency of origin licensing is proposed to contribute to chromosome instability in CDK-deregulated cell cycles, a frequent alteration in oncogenesis. However, the mechanism by which this instability occurs is largely unknown. Current models suggest that limited origin numbers would reduce for kdensity favouring chromosome rearrangements, but experimental support in CDK-deregulated cells is lacking. We have investigated the pattern of origin firing efficiency in budding yeast cells lacking the CDK regulators Cdh1 and Sic1. We show that each regulator is required for efficient origin activity, and that both cooperate non-redundantly. Notably, origins are differentially sensitive to CDK deregulation. Origin sensitivity is independent on normal origin efficiency, firing timing or chromosomal location. Interestingly,at a chromosome arm, there is a shortage of origin firing involving active and dormant origins, and the extent of short age correlates with the severity of CDK deregulation and chromosome instability. We therefore propose that CDK deregulation in G1 phase compromises origin redundancy by decreasing the number of active and dormant origins, leading to origin short age and increased chromosome instability.
Versión del editorhttp://dx.doi.org/10.1093/nar/gku313
URIhttp://hdl.handle.net/10261/102437
DOI10.1093/nar/gku313
E-ISSN1362-4962
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