Bloom's syndrome protein response to ultraviolet-C radiation and hydroxyurea-mediated DNA synthesis inhibition.

Abstract:

:Bloom's syndrome (BS) arises through mutations in both copies of the BLM gene that encodes a RecQ 3'-5' DNA helicase. BS patients are predisposed to developing all the cancers that affect the general population, and BS cells exhibit marked genetic instability. We showed recently that BLM protein contributes to the cellular response to ionizing radiation by acting as downstream ATM kinase effector. We now show that following UVC treatment, BLM-deficient cells exhibit a reduction in the number of replicative cells, a partial escape from the G2/M cell cycle checkpoint, and have an altered p21 response. Surprisingly, we found that hydroxyurea-treated BLM-deficient cells exhibit an intact S phase arrest, proper recovery from the S phase arrest, and intact p53 and p21 responses. We also show that the level of BLM falls sharply in response to UVC radiation. This UVC-induced reduction in BLM does not require a functional ATM gene and does not result from a subcellular compartment change. Finally, we demonstrate that exposure to UVC and hydroxyurea treatment both induce BLM phosphorylation via an ATM-independent pathway. These results are discussed in the light of their potential physiological significance with regard to the role of BLM in the cellular pathways activated by UVC radiation or HU-mediated inhibition of DNA synthesis.

journal_name

Oncogene

journal_title

Oncogene

authors

Ababou M,Dumaire V,Lécluse Y,Amor-Guéret M

doi

10.1038/sj.onc.1205246

subject

Has Abstract

pub_date

2002-03-27 00:00:00

pages

2079-88

issue

13

eissn

0950-9232

issn

1476-5594

journal_volume

21

pub_type

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