DNA secondary structures: stability and function of G-quadruplex structures.

DNA secondary structures: stability and function of G-quadruplex structures.
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DOI:
10.1038/nrg3296
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发表时间:
2012-11
期刊:
Nature reviews. Genetics
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除了典型的双螺旋结构外,DNA还可以折叠成各种分子间和分子内的二级结构。尽管许多这样的结构长期以来被认为是体外产物,但生物信息学表明,能够形成这些结构的DNA序列在整个进化过程中是保守的,这表明体内存在非b型DNA。此外,其产物促进这些结构形成或分解的基因存在于多种生物体中,越来越多的研究表明,DNA二级结构的分解对基因组的完整性至关重要。这篇综述的重点是关于g -四重体结构特征的新证据,以及这种结构对基因组稳定性和细胞过程(如转录)的可能影响。
In addition to the canonical double helix, DNA can fold into various other inter- and intramolecular secondary structures. Although many such structures were long thought to be in vitro artefacts, bioinformatics demonstrates that DNA sequences capable of forming these structures are conserved throughout evolution, suggesting the existence of non-B-form DNA in vivo. In addition, genes whose products promote formation or resolution of these structures are found in diverse organisms, and a growing body of work suggests that the resolution of DNA secondary structures is critical for genome integrity. This Review focuses on emerging evidence relating to the characteristics of G-quadruplex structures and the possible influence of such structures on genomic stability and cellular processes, such as transcription.
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