Specific TP53 mutation pattern in radiation-induced sarcomas.
The mutagenic properties of ionizing radiation are well known, but the presence of specific mutations in human radiation-induced tumours is not established. We have studied a series of 36 secondary sarcomas arising in the irradiation field of a primary tumour following radiotherapy. The allelic status and the presence of mutations of the TP53 gene were investigated. The mutation pattern was compared with data from sporadic sarcomas recorded in the IARC TP53 somatic mutations database. A high proportion (58%) of the radiation-induced sarcomas exhibited a somatic inactivating mutation for one allele of TP53, systematically associated with a loss of the other allele. The high frequency (52%) of short deletions observed in the mutation pattern of radiation-induced sarcomas may be related to the induction of DNA breaks by ionizing radiation. The lack of hyper-reactivity of CpG dinucleotides and the presence of recurrent sites of mutation at codons 135 and 237 seem also to be specific for radiation tumorigenesis.
UMR7147 Institut Curie-CNRS-UPMC, CEA LRC38, Paris, France.
Nathalie
N
Gonin-Laurent
Anne
A
Gibaud
Mathilde
M
Huygue
Sandrine H
SH
Lefèvre
Morgane
M
Le Bras
Laurent
L
Chauveinc
Xavier
X
Sastre-Garau
François
F
Doz
Livia
L
Lumbroso
Sylvie
S
Chevillard
Bernard
B
Malfoy
D000328:Adult; D000368:Aged; D000818:Animals; D045744:Cell Line, Tumor; D002675:Child, Preschool; D005260:Female; D016158:Genes, p53; D006801:Humans; D007223:Infant; D008297:Male; D051379:Mice; D008875:Middle Aged; D009154:Mutation; D009381:Neoplasms, Radiation-Induced / Q000235:genetics*; D012509:Sarcoma / Q000235:genetics*; D015533:Transcriptional Activation; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
D016159:Tumor Suppressor Protein p53