A postincision-deficient TFIIH causes replication fork breakage and uncovers alternative Rad51- or Pol32-mediated restart mechanisms.
Mol Cell
; 37(5): 690-701, 2010 Mar 12.
Article
em En
| MEDLINE
| ID: mdl-20227372
ABSTRACT
Homologous recombination is a major double-strand break (DSB) repair mechanism that acts during the S and G2 phases. In contrast, nucleotide excision repair (NER) is a major pathway for the repair of DNA bulky adducts that is unrelated to replication. We show that replication can be strongly disturbed in a specific type of rad3/XPD NER mutant of TFIIH, causing replication fork breakage. In contrast to classical NER-deficient mutations, the S. cerevisiae rad3-102 allele, which has a minimal impact on UV resistance, channels bulky adducts into DSBs. rad3-102 allows Rad1/XPF- and Rad2/XPG-catalyzed DNA incisions but fails to perform postincision steps retaining TFIIH at the damaged site. Broken forks are rescued by MRX-Rad52-Rfc1-dependent recombination via two types of replication restart mechanisms, one being Rad51 dependent and the other Pol32 dependent. Our results define the genetic and molecular hallmarks of replication fork breakage and restart and bring insights to understand specific NER-related human syndromes.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Recombinação Genética
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Saccharomyces cerevisiae
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DNA Fúngico
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Proteínas de Saccharomyces cerevisiae
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DNA Polimerase Dirigida por DNA
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Reparo do DNA
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Replicação do DNA
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Rad51 Recombinase
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Fator de Transcrição TFIIH
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Quebras de DNA de Cadeia Dupla
Tipo de estudo:
Etiology_studies
Idioma:
En
Revista:
Mol Cell
Assunto da revista:
BIOLOGIA MOLECULAR
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Espanha