Discoveries of Extrachromosomal Circles of DNA in Normal and Tumor Cells.

Discoveries of Extrachromosomal Circles of DNA in Normal and Tumor Cells.
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DOI:
10.1016/j.tig.2017.12.010
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发表时间:
2018-04
期刊:
Trends in genetics : TIG
影响因子:
--
通讯作者:
Dutta A
Dutta A
中科院分区:
其他
文献类型:
--
作者:
Paulsen T;Kumar P;Koseoglu MM;Dutta A

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虽然真核生物中的绝大多数细胞DNA包含在染色体中的长线性链中,但我们早就认识到一些例外,如线粒体DNA,酵母中的质粒和癌细胞中的双微体,其中DNA存在于染色体外环中。此外,已经注意到专门的染色体外DNA环(eccDNA)来自重复的基因组序列,如端粒DNA或核糖体DNA。最近,在正常和恶性细胞中发现了由独特(非重复)DNA产生的eccDNA,这引起了关于其生物起源、功能和临床应用的有趣问题。在这里,我们将审查最近的结果和未来的调查方向对这些新形式的eccDNA。
While the vast majority of cellular DNA in eukaryotes is contained in long linear strands in chromosomes, we have long recognized some exceptions like mitochondrial DNA, plasmids in yeasts and double-minutes in cancer cells where the DNA is present in extrachromosomal circles. In addition, specialized extrachromosomal circles of DNA (eccDNA) have been noted to arise from repetitive genomic sequences like telomeric DNA or ribosomal DNA. Recently eccDNA arising from unique (non-repetitive) DNA have been discovered in normal and malignant cells, raising interesting questions about their biogenesis, function and clinical utility. Here we will review recent results and future directions of inquiry on these new forms of eccDNA.
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