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J. Biol. Chem., Vol. 278, Issue 20, 18471-18477, May 16, 2003
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*
§,
,
From the Oxidative DNA base damage is mainly corrected by
the base excision repair (BER) pathway, which can be divided into two
subpathways depending on the length of the resynthetized patch, either
one nucleotide for short patch BER or several nucleotides for long patch BER. The role of proteins in the course of BER processes has been investigated in vitro using purified enzymes and
cell-free extracts. In this study, we have investigated the repair of
8-oxo-7,8-dihydroguanine (8-oxoG) in vivo using
wild-type, polymerase
Commissariat à l'Energie Atomique
(CEA), Direction des Sciences du Vivant, Département de
Radiobiologie et Radiopathologie, Unité Mixte de Recherche 217 CNRS-CEA Radiobiologie Moléculaire et Cellulaire, 92265 Fontenay aux Roses, France and ¶ Unité Propre de Recherche
9003, CNRS, Université Louis Pasteur, Ecole Supérieur
de Biotechnologie de Strasbourg, 67400 Illkirch, France

/
(Pol
/
),
poly(ADP-ribose) polymerase-1
/
(PARP-1
/
), and
Pol
/
PARP-1
/
3T3 cell lines. We used
non replicating plasmids containing a 8-oxoG:C base pair to study the
repair of the lesion located in a transcribed sequence (TS) or in a
non-transcribed sequence (NTS). The results show that 8-oxoG repair in
TS is not significantly impaired in cells deficient in Pol
or PARP-1
or both. Whereas 8-oxoG repair in NTS is normal in Pol
-null cells,
it is delayed in PARP-1-null cells and greatly impaired in cells
deficient in both Pol
and PARP-1. The removal of 8-oxoG and
presumably the cleavage at the resulting apurinic/apyrimidinic site are
not affected in the PARP-1
/
Pol
/
cell
lines. However, 8-oxoG repair is incomplete, yielding plasmid molecules
with a nick at the site of the lesion. Therefore,
PARP-1
/
Pol
/
cell lines cannot
perform 5'-dRP removal and/or DNA repair synthesis. Furthermore, the
poly(ADP-ribosyl)ation activity of PARP-1 is essential for 8-oxoG
repair in a Pol
/
context, because expression of the
catalytically inactive PARP-1 (E988K) mutant does not restore 8-oxoG
repair, whereas an wild type PARP-1 does.
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