Drouin, G., J.D. Hofman & W.F. Doolittle. (1987). Unusual ribosomal RNA gene organization in copepods of the genus Calanus. Journal of Molecular Biology. 196(4):943-946.
Unusual ribosomal RNA gene organization in copepods of the genus Calanus.
Journal of Molecular Biology
196(4):943-946.
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Ribosomal RNA genes in the nuclear genomes of eukaryotes are generally found in tandemly repeated units encoding 18 S, 5.8 S and 28 S rRNA (in that order). 5 S rRNA genes typically lie outside these units, most often in tandem clusters coding exclusively for 5 S rRNA. Inclusion of 5 S genes within the 18 S-5.8 S-28 S repeat unit is known only for certain protozoa and fungi. Here we report that, in the copepod Calanus finmarchicus, single 5 S genes are included within many or all of the 18 S-5.8 S-28 S repeat units. Sequence analyses of regions cloned from two of these repeat units show that they indeed include 5 S genes (which are distal to 28 S genes) and that these are transcribed from opposite strands.
