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Functional consequences of ATM sequence variants for chromosomal radiosensitivity
Author(s) -
GutiérrezEnríquez Sara,
Fernet Marie,
Dörk Thilo,
Bremer Michael,
Lauge Anthony,
StoppaLyonnet Dominique,
Moullan Norman,
Angèle Sandra,
Hall Janet
Publication year - 2004
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/gcc.20025
Subject(s) - radiosensitivity , biology , single nucleotide polymorphism , ataxia telangiectasia , genetics , microbiology and biotechnology , gene , dna damage , genotype , allele , cell culture , dna , medicine , radiation therapy
The ATM [for ataxia‐telangiectasia (A‐T) mutated] protein plays a key role in the detection and cellular response to DNA double‐strand breaks. Several single‐nucleotide polymorphisms (SNPs) have been described in the ATM gene; however, their association with cancer risk or radiosensitivity remains to be fully established. In this study, the functional consequences of specific ATM SNPs on in vitro radiosensitivity, as assessed by micronuclei (MN) formation, were measured in lymphoblastoid cell lines established from 10 breast cancer (BC) patients carrying different ATM missense SNPs, six A‐T patients, six A‐T heterozygotes (A‐T het), and six normal individuals. The BC, A‐T het, and A‐T cell line groups showed significantly higher mean levels of MN formation after exposure to ionizing radiation (IR) than did the group containing normal cell lines, with similar levels in the BC and A‐T het groups. Within the BC lines studied, the group composed of the six carrying the linked 2572T>C (858F>L) and 3161C>G (1054P>R) variants had a higher level of MN after IR exposure compared to that observed in the remaining four BC or in the normal cell lines. This increase was not related to the constitutive ATM mRNA level, which was similar in these BC and the normal cell lines. Our results indicate that alterations in the ATM gene, including the presence of heterozygous mutations and the 2572C and 3161G variant alleles, are associated with increased in vitro chromosomal radiosensitivity, perhaps by interfering with ATM function in a dominant‐negative manner. © 2004 Wiley‐Liss, Inc.