title: Paired sequence difference in ribosomal RNAs: evolutionary and phylogenetic implications.
abstract: Ribosomal RNAs have secondary structures that are maintained by internal Watson-Crick pairing. Through analysis of chordate, arthropod, and plant 5S ribosomal RNA sequences, we show that Darwinian selection operates on these nucleotide sequences to maintain functionally important secondary structure. Insect phylogenies based on nucleotide positions involved in pairing and the production of secondary structure are incongruent with those constructed on the basis of positions that are not. Furthermore, phylogeny reconstruction using these nonpairing bases is concordant with other, morphological data.
authors: Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.
authors: W C
authors: WC
authors: Wheeler
authors: R L
authors: RL
authors: Honeycutt
mesh_terms: D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D007448:Invertebrates / Q000235:genetics; D008957:Models, Genetic; D009690:Nucleic Acid Conformation; D010802:Phylogeny; D010944:Plants / Q000235:genetics; D012335:RNA, Ribosomal / Q000235:genetics*
chemical_list: D012335:RNA, Ribosomal