The etiology of uracil residues in the Saccharomyces cerevisiae genomic DNA.

The etiology of uracil residues in the Saccharomyces cerevisiae genomic DNA.
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DOI:
10.1007/s00294-018-0895-8
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发表时间:
2019-04
期刊:
影响因子:
2.5
通讯作者:
Kim N
Kim N
中科院分区:
生物学3区
文献类型:
--
作者:
Owiti N;Stokdyk K;Kim N

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DNA中的非典型残基是基因组不稳定性的一个主要和保守的来源。DNA中尿嘧啶残基的出现伴随着显著的致突变后果,并且在多个水平上受到调节,从核苷酸库中可用的dUTP的浓度到从DNA中去除的切除修复。最近,在酿酒酵母基因组中描述了尿嘧啶衍生突变的转录相关升高的有趣现象。在试图了解突变的变异性时,我们发现尿嘧啶掺入DNA的频率可能会根据转录速率而变化,并且非复制性、修复相关的DNA合成是活跃转录基因组基因座较高尿嘧啶密度的基础。这种新的机制汇集了转录下的DNA的化学脆弱性和尿嘧啶相关的诱变,并有可能适用于其他非典型残基的诱变重要性。
Non-canonical residue in DNA is a major and conserved source of genome instability. The appearance of uracil residues in DNA accompanies a significant mutagenic consequence and is regulated at multiple levels, from the concentration of available dUTP in the nucleotide pool to the excision repair for removal from DNA. Recently, an interesting phenomenon of transcription-associated elevation in uracil-derived mutations was described in Saccharomyces cerevisiae genome. While trying to understand the variability in mutagenesis, we uncovered that the frequency of uracil incorporation into DNA can vary depending on the transcription rate and that the non-replicative, repair-associated DNA synthesis underlies the higher uracil density of the actively transcribed genomic loci. This novel mechanism brings together the chemical vulnerability of DNA under transcription and the uracil-associated mutagenesis, and has the potential to apply to other non-canonical residues of mutagenic importance.
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发表时间: 1990-05-01
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