Regulation of ribosomal RNA gene copy number and its role in modulating genome integrity and evolutionary adaptability in yeast.

Regulation of ribosomal RNA gene copy number and its role in modulating genome integrity and evolutionary adaptability in yeast.
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DOI:
10.1007/s00018-010-0613-2
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发表时间:
2011-04
影响因子:
8
通讯作者:
Kobayashi, Takehiko
Kobayashi, Takehiko
中科院分区:
生物学1区
文献类型:
--
作者:
Kobayashi, Takehiko

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编码核糖体RNA (rRNA)的基因是真核生物基因组中最丰富的基因。它们驻留在串联重复的集群中,在某些情况下总共有数百个副本。由于其重复结构和高度活跃的转录,rRNA基因重复序列是染色体中最脆弱的一些位点。一个独特的基因扩增系统弥补了拷贝的损失,从而保持拷贝数,尽管有一些波动。rRNA基因重复序列的不寻常性质影响细胞功能,如衰老。此外,我们最近发现,重复数决定了对DNA损伤的敏感性。在这篇综述中,我想介绍rRNA基因重复序列(称为rDNA)作为维持基因组完整性的中心的一个新的方面,并讨论它对进化的贡献。
The genes encoding ribosomal RNA (rRNA) are the most abundant genes in the eukaryotic genome. They reside in tandem repetitive clusters, in some cases totaling hundreds of copies. Due to their repetitive structure and highly active transcription, the rRNA gene repeats are some of the most fragile sites in the chromosome. A unique gene amplification system compensates for loss of copies, thus maintaining copy number, albeit with some fluctuations. The unusual nature of rRNA gene repeats affects cellular functions such as senescence. In addition, we recently found that the repeat number determines sensitivity to DNA damage. In this review, I would like to introduce a new aspect of the rRNA gene repeat (called rDNA) as a center of maintenance of genome integrity and discuss its contribution to evolution.
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