Mutational processes molding the genomes of 21 breast cancers.
Cell
; 149(5): 979-93, 2012 May 25.
Article
em En
| MEDLINE
| ID: mdl-22608084
ABSTRACT
All cancers carry somatic mutations. The patterns of mutation in cancer genomes reflect the DNA damage and repair processes to which cancer cells and their precursors have been exposed. To explore these mechanisms further, we generated catalogs of somatic mutation from 21 breast cancers and applied mathematical methods to extract mutational signatures of the underlying processes. Multiple distinct single- and double-nucleotide substitution signatures were discernible. Cancers with BRCA1 or BRCA2 mutations exhibited a characteristic combination of substitution mutation signatures and a distinctive profile of deletions. Complex relationships between somatic mutation prevalence and transcription were detected. A remarkable phenomenon of localized hypermutation, termed "kataegis," was observed. Regions of kataegis differed between cancers but usually colocalized with somatic rearrangements. Base substitutions in these regions were almost exclusively of cytosine at TpC dinucleotides. The mechanisms underlying most of these mutational signatures are unknown. However, a role for the APOBEC family of cytidine deaminases is proposed.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
/
Análise Mutacional de DNA
/
Estudo de Associação Genômica Ampla
/
Mutação
Tipo de estudo:
Risk_factors_studies
Limite:
Female
/
Humans
Idioma:
En
Revista:
Cell
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Reino Unido