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. 1993 Mar 25;21(6):1449–1455. doi: 10.1093/nar/21.6.1449

The sequence of 28S ribosomal RNA varies within and between human cell lines.

H Leffers 1, A H Andersen 1
PMCID: PMC309331  PMID: 8464736

Abstract

The primary structure of 28S ribosomal RNA constitutes a conserved core which is similar among most 23S-like rRNAs and expansion segments which occur at specific positions in the sequence. The expansion segments account for most of the size difference between prokaryotic (archaeal and eubacterial) and eukaryotic rRNAs and they exhibit a sequence variation which is unique among rRNAs. We have investigated the sequence variation of one of the expansion segments, V8, by sequencing a total of 111 V8 segments from 9 different human cell lines and tissues and have found 35 different variants. The variation occur mainly at two 'hot spots' which are separated by 170 nucleotides in the primary sequence but are neighbours in the secondary structure. The sequence of V8 segments varies both within and between human cell lines and tissues. The implications for the evolution of the eukaryotic 28S rRNA are discussed together with possible functions of the expansion segments. We also present a secondary structure model for the V8 segment based on comparative sequence analysis and chemical and enzymatic foot printing.

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Selected References

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