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Synergistic effect of TRM2/RNC1 and EXO1 in DNA double-strand break repair in Saccharomyces cerevisiae.

Abstract：

:In our recently published study, we provided in vitro as well as in vivo data demonstrating the involvement of TRM2/RNC1 in homologous recombination based repair (HRR) of DNA double strand breaks (DSBs), in support of such claims reported earlier. To further validate its role in DNA DSB processing, our present study revealed that the trm2 single mutant displays higher sensitivity to persistent induction of specific DSBs at the MAT locus by HO-endonuclease with higher sterility rate among the survivors compared to wild type (wt) or exo1 single mutants. Intriguingly, both sensitivity and sterility rate increased dramatically in trm2exo1 double mutants lacking both endo-exonucleases with a progressively increased sterility rate in trm2exo1 double mutants with short-induction periods, reaching a very high level of sterility with persistent DSB inductions. Mutation analysis of the mating type (MAT) locus among the sterile survivors with persistent HO-induction in trm2 and exo1 single mutants as well as in trm2exo1 double mutants revealed a similar small insertions and deletions events, characteristic of non-homologous end joining (NHEJ) that might have occurred due to the lack of proper processing function in these mutants. In addition, trm2ku80 and trm2rad52 double mutants also displayed significantly higher sterility with persistent DSB induction compared to ku80 and rad52 single mutants, respectively, exhibiting a mutation spectra that shifted from base substitution (in ku80 and rad52 single mutants) to small insertions and deletions in the double mutants (in trm2ku80 and trm2rad52 mutants). These data indicate a defective processing in absence of TRM2, with a synergistic effect of TRM2, and EXO1 in such processing.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Choudhury SA,Asefa B,Kauler P,Chow TY

doi

10.1007/s11010-007-9493-7

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

127-34

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

304

pub_type

杂志文章

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