p53 is a rate-limiting factor in the repair of higher-order DNA structure.
The product of the p53 tumor suppressor gene has been implicated in safeguarding genomic stability by transactivating genes involved in cell cycle arrest, repair of DNA damage or induction of apoptosis. Several properties of p53 suggest that it might be directly involved in DNA repair processes. Eukaryotic DNA is highly organized in supercoiled loops anchored to the nuclear matrix. This organization is very important for cell function and survival, suggesting that repair of DNA damage must include both, the integrity of the double helix and the complex DNA topology. In this work, we studied the kinetics and efficiency of higher-order DNA structure repair in cells with normal and reduced levels of p53, and present evidence suggesting that p53 may be involved in the stabilization and/or repair of higher-order DNA structure.
Aranda-Anzaldo
A
A
Laboratorio de Biología Molecular, Facultad de Medicina, UAEM, Edo. Mexico, Mexico.
Orozco-Velasco
F
F
García-Villa
E
E
Gariglio
P
P
D002467:Cell Nucleus / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D004260:DNA Repair; D004268:DNA-Binding Proteins; D003907:Dexamethasone / Q000494:pharmacology; D004996:Ethidium; D005260:Female; D006801:Humans; D009856:Oncogene Proteins, Viral / Q000096:biosynthesis; D027383:Papillomaviridae / Q000235:genetics; D013997:Time Factors; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000172:deficiency / Q000378:metabolism*; D014466:Ultraviolet Rays; D002583:Uterine Cervical Neoplasms
D004268:DNA-Binding Proteins; C052603:E6 protein, Human papillomavirus type 18; D009856:Oncogene Proteins, Viral; D016159:Tumor Suppressor Protein p53; D003907:Dexamethasone; D004996:Ethidium