Carcinogenesis, Vol 19, 781-789, Copyright © 1998 by Oxford University Press
P Kannouche, G Pinon-Lataillade, A Tissier, O Chevalier-Lagente, A Sarasin, M Mezzina and JF Angulo
UV-irradiation induces, in mammalian cells, the expression of a set of
genes known as the 'UV-response', which may be reminiscent of the bacterial
response, called SOS system. The multifunctional protein RecA controls the
expression of the SOS genes. We report the expression profile of a mouse
gene conserved among mammals, called Kin17, that codes a DNA-binding
protein of undetermined biochemical activity and which shares epitopes with
the bacterial RecA protein. We demonstrate that the level of Kin17 RNA was
5-fold higher in mid-S phase of serum- stimulated BALB/c 3T3 fibroblasts
than in quiescent cells. Cells in S- phase displayed a high level of kin17
protein with a marked nuclear localisation. The maximal level of Kin17 RNA
was observed 18 h after serum stimulation, indicating that Kin17 gene is a
new member of the late growth-related genes. The accumulation of kin17
protein during cell proliferation follows the increase in Kin17 RNA and
correlates with DNA synthesis, which suggests a possible role of kin17
protein in a transaction related to DNA-replication. In quiescent
fibroblasts, a 3- fold increase in Kin17 RNA was seen 13 h after UV
irradiation. In parallel, kin17 protein accumulated in the nucleus, which
suggests that it might be required after the stress produced by UV
irradiation.
ARTICLES
The nuclear concentration of kin17, a mouse protein that binds to curved DNA, increases during cell proliferation and after UV irradiation
Departement de Radiobiologie et de Radiopathologie, Direction des Sciences du Vivant, Centre d'Etudes de Fontenay-aux-Roses, France.
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