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Interrelatedness of 5S RNA sequences investigated by correspondence analysis
Authors:Carmen A. Mannella  Joachim Frank  Nicholas Delihas
Affiliation:(1) Wadsworth Center for Laboratories and Research, New York State Department of Health, 12201 Albany, New York, USA;(2) Department of Microbiology, School of Medicine, State University of New York at Stony Brook, 11794 Stony Brook, New York, USA
Abstract:Summary Correspondence analysis (a form of multivariate statistics) applied to 74 5S ribosomal RNA sequences indicates that the sequences are interrelated in a systematic, nonrandom fashion. Aligned sequences are represented as vectors in a 5N-dimensional space, where N is the number of base positions in the 5S RNA molecule. Mutually orthogonal directions (called factor axes) along which intersequence variance is greatest are defined in this hyperspace. Projection of the sequences onto planes defined by these factorial directions reveals clustering of species that is suggestive of phylogenetic relationships. For each factorial direction, correspondence analysis points to regions of ldquoimportancerdquo, i.e., those base positions at which the systematic changes occur that define that particular direction. In effect, the technique provides a rapid determination of group-specific signatures. In several instances, similarities between sequences are indicated that have only recently been inferred from visual base-to-base comparisons. These results suggest that correspondence analysis may provide a valuable starting point from which to uncover the patterns of change underlying the evolution of a macromolecule, such as 5S RNA.
Keywords:5S RNA  Correspondence analysis  Multivariate statistics  Evolution  Phylogeny
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