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doi: 10.1242/10.1242/jcs.00162
Research Article |
to replication foci
Genetic Instability and Cancer, Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 route de Narbonne, 31077 Toulouse Cedex, France
* Authors for correspondence (e-mail: jseb{at}ipbs.fr; cazaux@ipbs.fr)
Accepted 5 September 2002
The replication of the undamaged genomic DNA requires error-free DNA
polymerases
and
as part of a protein complex that acts
continuously along the double helix. In contrast, when the genomic structure
is perturbed, DNA replication needs to function more flexibly to bypass DNA
distortions. It has been proposed that the newly discovered error prone DNA
polymerases play a role in the replication of irregular structure. Here we
report that one of them, the human Pol
, is mostly localised uniformly
in the nucleus of undamaged cells, but could be also concentrated in
PCNA-containing replication foci. Following treatment with anti-replicative
agents, the proportion of foci-containing cells was increased. These data
suggest that Pol
may function as part of the replication machinery
itself and could be recruited when replicative complexes are stalled.
Mutagenesis experiments also indicated that Pol
involvement may affect
the accuracy of DNA replication. The results are discussed within the context
of the oncogenic process since Pol
has been found as overexpressed in
some cancers.
Key words: Pol
, DNA replication, DNA mutagenesis
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