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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Napolitano, R. L. Lambert, I. B. Fuchs, R. P. |
| Description | Author Affiliation: Napolitano RL ( Unité Propre de Recherche 9003 du Centre National de la Recherche Scientifique, Cancérogenèse et Mutagenèse Moléculaire et Structurale, Ecole Supérieure de Biotechnologie de Strasbourg, Blvd S. Brant, 67400 Strasbourg, France.); |
| Abstract | Mutations are permanent DNA sequence changes that can be induced when replication occurs on a damaged DNA template. In Escherichia coli, the process of translesion synthesis past a lesion that hinders replication requires the induction of SOS-controlled gene products, among which are those of the umuDC operon. To study translesion synthesis in vivo, we have constructed single-stranded vectors containing single 2-acetylaminofluorene adducts located within -1 and -2 frameshift mutation hot spots formed by short repetitive sequences. These adducts strongly hinder DNA replication as only 2-5% of the molecules give rise to progeny under non-SOS-induced conditions. Induction of the SOS response lead to a 10-fold increase in survival. Adducts present within repetitive sequences trigger the formation of misaligned primer/template replication intermediates which, upon elongation, will result in the fixation of frameshift errors (mutagenic translesion synthesis). Surprisingly we find that elongation from the nonslipped intermediate depends upon functional umuDC+ gene products, whereas elongation from the slipped intermediate is umuDC+ independent but requires another, as yet biochemically uncharacterized, SOS function. These data are discussed in terms of the different steps involved during translesion synthesis through a replication-blocking lesion. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 11 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Escherichia Coli Genetics Frameshift Mutation SOS Response (Genetics) 2-Acetylaminofluorene Pharmacology DNA Damage DNA Replication DNA-Directed DNA Polymerase Metabolism Drug Effects Models, Genetic Mutagenesis Mutagens Oligonucleotide Probes Operon Templates, Genetic Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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