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Nucleic Acids Research, 1982, Vol. 10, No. 18 5711-5716
© 1982

MOLECULAR BIOLOGY

5S RNA sequence from the Philosamia silkworm: evidence for variable evolutionary rates in insect 5S RNA

Gu Xian-Rong, Krikor Nicoghosian and R.J. Cedergren

Départment de Biochimie, Université de Montréal Montréal, Québec, Canada H3C 3J7

Received April 19, 1982. Revised June 29, 1982. Accepted June 29, 1982.

The primary structure of 5S RNA isolated from the posterior silkgland of Philosamia cynthia. ricini. was determined using three in vitro labelling techniques. The derived sequence consists of 119 nucleotides and can be folded into the secondary structure model proposed for eukaryotic 5S RNAs. This 5S RNA differs from the Bombyx mori. molecule in 9 positions and from the Drosophila. melanogaster sequence in 14 positions. The comparison of evolutionary rates in insect 5S RNA with inferred rates in other eukaryotic phyla leads to the conclusion that 5S RNA evolution is not constant in different eukaryotic branches, a condition which must be taken into account in phylogenetic tree constructions.


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