Pir51, a Rad51-interacting protein with high expression in aggressive lymphoma, controls mitomycin C sensitivity and prevents chromosomal breaks.
Mutat Res
; 601(1-2): 113-24, 2006 Oct 10.
Article
em En
| MEDLINE
| ID: mdl-16920159
ABSTRACT
Pir51, a protein of unknown function that interacts with Rad51, was identified in a screen for genes that were highly expressed in aggressive mantle cell lymphoma (MCL) versus indolent small lymphocytic lymphoma (SLL) patient samples. We show that Pir51 is a nuclear protein expressed in a variety of cell types and that its expression is regulated during the cell cycle in a pattern nearly identical to Rad51. Also similar to Rad51, Pir51 levels did not change in response to a variety of DNA damaging agents. siRNA depletion of Pir51 did not reduce homologous recombination repair (HRR), but sensitized cells to mitomycin C (MMC)-induced DNA crosslinking and resulted in elevated levels of double-strand breaks (DSBs) in metaphase chromosome spreads and reduced colony formation. Therefore, Pir51 maintains genomic integrity and potentially connects the early response to DNA crosslinks, orchestrated by the ATR kinase and Fanconi Anemia (FA) proteins, to later stages of Rad51-dependent repair. Our results provide the first example of a Rad51-binding protein that influences DNA crosslink repair without affecting homologous recombination repair.
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Base de dados:
MEDLINE
Assunto principal:
Expressão Gênica
/
Mitomicina
/
Quebra Cromossômica
/
Proteínas de Ligação a DNA
/
Linfoma
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
Mutat Res
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos