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. 1979 Oct 10;7(3):751–764. doi: 10.1093/nar/7.3.751

Preferential expression of unique sequences adjacent to middle repetitive sequences in mouse cytoplasmic RNA.

A Kuroiwa, S Natori
PMCID: PMC328053  PMID: 503845

Abstract

Total single-copy DNA and single-copy DNA contiguous to middle repetitive sequences were isolated from mouse brain by successive hydroxylapatite column chromatographies. These DNAs, termed repeat-contiguous single-copy DNA, were found to constitute 48% of the total single-copy DNA. The saturation hybridization values of these two DNA probes to nuclear RNA and cytoplasmic RNA containing polyA of mouse brain and liver were measured. The saturation hybridization levels of total single-copy DNA to brain and liver nuclear RNA were 13.5% and 8.8%, respectively, and those of repeat-contiguous single-copy DNA to the same RNA samples were 13.3% and 8.5%, respectively. On the contrary, the saturation hybridization levels of single-copy DNA to cytoplasmic RNA containing polyA of brain and liver were 3.8% and 2.0%, respectively, and those of repeat-contiguous single-copy DNA to the same RNA samples were 5.8% and 4.0%, respectively. Similar results were obtained with total cytoplasmic RNA. These results indicate that about half the steady state nuclear RNA is transcribed from repeat-contiguous single-copy DNA, and that cytoplasmic RNA containing polyA is mainly derived from repeat-contiguous single-copy DNA.

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Selected References

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