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Science 6 January 1989:
Vol. 243. no. 4887, pp. 75 - 77
DOI: 10.1126/science.2911720
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Articles

Science, Vol 243, Issue 4887, 75-77
Copyright © 1989 by American Association for the Advancement of Science

articles

Phylogenetic meaning of the kingdom concept: an unusual ribosomal RNA from Giardia lamblia

ML Sogin, JH Gunderson, HJ Elwood, RA Alonso, and DA Peattie

National Jewish Center for Immunology and Respiratory Medicine, Department of Pediatrics, Denver, CO 80206.

An analysis of the small subunit ribosomal RNA (16S-like rRNA) from the protozoan Giardia lamblia provided a new perspective on the evolution of nucleated cells. Evolutionary distances estimated from sequence comparisons between the 16S-like rRNAs of Giardia lamblia and other eukaryotes exceed similar estimates of evolutionary diversity between archaebacteria and eubacteria and challenge the phylogenetic significance of multiple eukaryotic kingdoms. The Giardia lamblia 16S-like rRNA has retained many of the features that may have been present in the common ancestor of eukaryotes and prokaryotes.


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