Abstract:
:DNA repair associated with DNA replication is important for the conservation of genomic sequence information, whereas reconstitution of chromatin after replication sustains epigenetic information. We have isolated and characterized mutations in the BRU1 gene of Arabidopsis that suggest a novel link between these underlying maintenance mechanisms. Bru1 plants are highly sensitive to genotoxic stress and show stochastic release of transcriptional gene silencing. They also show increased intrachromosomal homologous recombination and constitutively activated expression of poly (ADP-ribose) polymerase-2 (AtPARP-2), the induction of which is associated with elevated DNA damage. Bru1 mutations affect the stability of heterochromatin organization but do not interfere with genome-wide DNA methylation. BRU1 encodes a novel nuclear protein with two predicted protein-protein interaction domains. The developmental abnormalities characteristic of bru1 mutant plants resemble those triggered by mutations in genes encoding subunits of chromatin assembly factor (CAF-1), the condensin complex, or MRE11. Comparison of bru1 with these mutants indicates cooperative roles in the replication and stabilization of chromatin structure, providing a novel link between chromatin replication, epigenetic inheritance, S-phase DNA damage checkpoints, and the regulation of meristem development.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Takeda S,Tadele Z,Hofmann I,Probst AV,Angelis KJ,Kaya H,Araki T,Mengiste T,Mittelsten Scheid O,Shibahara K,Scheel D,Paszkowski Jdoi
10.1101/gad.295404subject
Has Abstractpub_date
2004-04-01 00:00:00pages
782-93issue
7eissn
0890-9369issn
1549-5477pii
18/7/782journal_volume
18pub_type
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