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Molecular Biology and Evolution, Vol 8, 503-514, Copyright © 1991 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Molecular evolution of the mammalian ribosomal protein gene, RPS14

DD Rhoads and DJ Roufa
Division of Biology, Kansas State University, Manhattan 66506.

Ribosomal protein S14 genes (RPS14) in eukaryotic species from protozoa to primates exhibit dramatically different intron-exon structures yet share homologous polypeptide-coding sequences. To recognize common features of RPS14 gene architectures in closely related mammalian species and to evaluate similarities in their noncoding DNA sequences, we isolated the intron-containing S14 locus from Chinese hamster ovary (CHO) cell DNA by using a PCR strategy and compared it with human RPS14. We found that rodent and primate S14 genes are composed of identical protein-coding exons interrupted by introns at four conserved DNA sites. However, the structures of corresponding CHO and human RPS14 introns differ significantly. Nonetheless, individual intron splice donor, splice acceptor, and upstream flanking motifs have been conserved within mammalian S14 homologues as well as within RPS14 gene fragments PCR amplified from other vertebrate genera (birds and bony fish). Our data indicate that noncoding, intronic DNA sequences within highly conserved, single-copy ribosomal protein genes are useful molecular landmarks for phylogenetic analysis of closely related vertebrate species.
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