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Age-related association of rDNA and telomeres with the nuclear matrix in mouse hepatocytes.

机译:rDNA和端粒与小鼠肝细胞核基质的年龄相关联。

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Transcribed sequences have been suggested to be associated with the nuclear matrix, differing from non-transcribing sequences, which have been reported to be contained in DNA loops. However, although a dozen of genes have their expression level affected by aging, data on chromatin-nuclear matrix interactions under this physiological condition are still scarce. In the present study, liver imprints from young, adult and old mice were subjected to FISH (fluorescence in situ hybridization) for 45S rDNA and telomeric sequences, with or without a lysis treatment to produce extended chromatin fibres. There was an increased amount of 45S rDNA sequences located in DNA loops as the animals grow older, while telomeric sequences were always observed in DNA loops irrespective of the animal age. We assume that active rRNA genes associate with the nuclear matrix, while DNA loops contain silent sequences. Transcription of each 45S rDNA repeat unit is suggested to be dependent on its interaction with the nuclear matrix.
机译:已提出转录序列与核基质有关,这与非转录序列不同,后者据报道包含在DNA环中。然而,尽管十几个基因的表达水平受到衰老的影响,但在这种生理条件下,染色质-核基质相互作用的数据仍然很少。在本研究中,对来自年轻,成年和成年小鼠的肝脏印记进行FISH(荧光原位杂交)检测45S rDNA和端粒序列,并进行或不进行裂解处理以产生延伸的染色质纤维。随着动物年龄的增长,位于DNA环中的45S rDNA序列数量增加,而无论动物年龄如何,总是在DNA环中观察到端粒序列。我们假设活性rRNA基因与核基质相关,而DNA环包含沉默序列。建议每个45S rDNA重复单元的转录取决于其与核基质的相互作用。

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