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. 1988 Jul 11;16(13):6041–6056. doi: 10.1093/nar/16.13.6041

Homologous genes for mouse 4.5S hybRNA are found in all eukaryotes and their low molecular weight RNA transcripts intermolecularly hybridize with eukaryotic 18S ribosomal RNAs.

Q Trinh-Rohlik 1, E S Maxwell 1
PMCID: PMC336846  PMID: 3399384

Abstract

Previous work has reported the isolation and sequencing of a mouse low molecular weight RNA species designated 4.5S hybridizing RNA or hybRNA because of its ability to intermolecularly hybridize with mouse mRNA and 18S rRNA sequences. Using synthetic DNA oligonucleotide probes we have examined the conservation of this gene sequence and its expression as a lmwRNA transcript across evolution. Southern blot analysis has shown that homologous genes of single or low copy number are found in all eukaryotes examined as well as in E. coli. Northern blot analysis has demonstrated 4.5S hybRNA transcription in all mouse tissues as well as expression in yeast and Xenopus laevis as lmwRNAs of approximately 130 and 100 nucleotides, respectively, as compared with mouse/rat/hamster species of approximately 87 nucleotides. Yeast and X. laevis 4.5S hybRNA homologs, isolated by hybrid-selection, were shown by Northern blot analysis to intermolecularly hybridize with homologous as well as heterologous 18S rRNA sequences. The conservation of 4.5S hybRNA homologous genes and their expression as lmwRNA transcripts with common intermolecular RNA:RNA hybridization capabilities in fungi, amphibians, and mammals argues for a common, conserved and required biological function for this lmwRNA in all eukaryotes and potential utilization of its intermolecular RNA:RNA hybridization capabilities to carry out this function.

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