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. 1984 Feb;4(2):310–316. doi: 10.1128/mcb.4.2.310

Structure and distribution of Alu family sequences or their analogs within heterogeneous nuclear RNA of HeLa, KB, and L cells.

H D Robertson, E Dickson
PMCID: PMC368697  PMID: 6700593

Abstract

We studied the distribution of repetitive sequence elements capable of forming double-stranded regions in nuclear RNA of HeLa, KB, and L cells. In human RNA populations, we called these regions duplex Alu family RNA (dAfRNA) because they represent transcripts of the highly reiterated family of DNA regions known as "Alu family DNA" (Rubin et al., Nature (London) 284:372-374, 1980). Although the dAfRNA populations of both human cell lines (HeLa and KB) have low sequence complexity, they represent 5% of the total heterogeneous nuclear RNA and have identical fingerprints; mouse L-cell dAf-like RNA (which has a similar complexity) represents only 2% of the total heterogeneous nuclear RNA and has an entirely different fingerprint. We utilized Escherichia coli RNase III as a highly specific reagent for the recognition of RNA:RNA duplex structure. This enzyme cleaves within the six characteristic RNase T1-resistant oligonucleotides of HeLa- and KB-cell dAfRNA (Robertson et al., J. Mol. Biol. 115:571-589, 1977). In addition, the size of heterogeneous nuclear RNA from all three cell types is reduced from greater than 32S to about 15S after RNase III treatment. We conclude that this size shift is a result of cleavage within dAfRNA regions and that such regions are present in most or all of the large RNA transcripts of these cells.

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Selected References

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