DNA repair excision nuclease attacks undamaged DNA. A potential source of spontaneous mutations - PubMed (original) (raw)
. 2001 Jul 6;276(27):25421-6.
doi: 10.1074/jbc.M101032200. Epub 2001 May 15.
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- PMID: 11353769
- DOI: 10.1074/jbc.M101032200
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DNA repair excision nuclease attacks undamaged DNA. A potential source of spontaneous mutations
M E Branum et al. J Biol Chem. 2001.
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Abstract
Nucleotide excision repair is a general repair system that eliminates many dissimilar lesions from DNA. In an effort to understand substrate determinants of this repair system, we tested DNAs with minor backbone modifications using the ultrasensitive excision assay. We found that a phosphorothioate and a methylphosphonate were excised with low efficiency. Surprisingly, we also found that fragments of 23-28 nucleotides and of 12-13 nucleotides characteristic of human and Escherichia coli excision repair, respectively, were removed from undamaged DNA at a significant rate. Considering the relative abundance of undamaged DNA in comparison to damaged DNA in the course of the life of an organism, we conclude that, in general, excision from and resynthesis of undamaged DNA may exceed the excision and resynthesis caused by DNA damage. As resynthesis is invariably associated with mutations, we propose that gratuitous repair may be an important source of spontaneous mutations.
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