𝔖 Bobbio Scriptorium
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Molecular classification of living organisms

✍ Scribed by C. Saccone; C. Gissi; C. Lanave; G. Pesole

Publisher
Springer
Year
1995
Tongue
English
Weight
669 KB
Volume
40
Category
Article
ISSN
0022-2844

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✦ Synopsis

Recent studies in molecular evolution have generated strong conflicts in opinion as to how world living organisms should be classified. The traditional classification of life into five kingdoms has been challenged by the molecular analysis carried out mostly on rRNA sequences, which supported the division of the extant living organisms into three major groups: Archaebacteria, Eubacteria, and Eukaryota. As to the problem of placing the root of the tree of life, the analysis carried out on a few genes has provided discrepant results. In order to measure the genetic distances between species, we have carried out an evolutionary analysis of the glutamine synthetase genes, which previously have been revealed to be good molecular clocks, and of the small and large rRNA genes. All data demonstrate that archaebacteria are more closely related to eubacteria than to eukaryota, thus supporting the classical division of living organisms into two main superldngdoms, Prokaryota and Eukaryota.

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