3 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 3...

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PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 3 Diversity: the new paradigm
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“Without a capacity to determine bacterial genealogies, considerations of bacterial evolution are mere cerebral exercises. The result of all this was that microbiology worked from a paradigm that for all intents and purposes was devoid of evolutionary concepts. Determining microbial phylogeny is not simply the long awaited completion of the ‘Darwinian programme,’ the extension of evolutionary study to all life on this planet. Rather than its providing the few missing pieces in the great puzzle of evolution, bacterial evolution in effect is the puzzle .” Quote from: C.R. Woese (1987) Bacterial evolution. Microbiol. Rev. 51:221-271 Carl Woese Father of the “Tree of Life”
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http://fig.cox.miami.edu/~cmallery/150/unity/c1x17b-finches.jpg The rich morphology of The rich morphology of metazoa metazoa provides a large number of provides a large number of characteristics to develop robust classification schemes characteristics to develop robust classification schemes An effective classification scheme should represent a natural rather than artificial group and reflect evolutionary relationships
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E. Coli 16S rRNA 70S ribosome 16S/18S 16S/18S rRNA rRNA : : • Central component in protein synthesis • Functionally conserved • Regions in which nucleotide sequence is conserved in all cells
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• Universally distributed and conserved structure • Abundant (>80% of a cells total RNA) • Coded for in organellar, nuclear, and prokaryotic genomes • Slow- and fast-evolving portions; "hour and minute hands" • Statistically sufficient number of nucleotides • Ancient and essential function • No lateral gene transfer (LGT) Why use 16S/18S Why use 16S/18S rRNA rRNA as a as a molecular chronometer?
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3 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 3...

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