Barns, S.M., C.F. Delwiche, J.D. Palmer, and N.R. Pace. 1996. Perspectives
on archaeal diversity, thermophily and monophyly from environmental rRNAsequences.
Proc. Natl. Acad. Sci. In press.
Abstract:
Phylogenetic analysis of ribosomal RNA sequences obtained from uncultivated
organisms of a hot spring in Yellowstone National Park reveals several novel
groups of Archaea, many of which diverged from the crenarchaeal line of
descent prior to previously characterized members of that kingdom. Universal
phylogenetic trees constructed with the addition of these sequences indicate
monophyly of Archaea, with modest bootstrap support. The data also show
a specific relationship between low-temperature marine Archaea and some
hot spring Archaea. Two of the environmental sequences are enigmatic: depending
upon the dataset and analytical method used, these sequences branch deeply
within the Crenarchaeota, below the bifurcation between Crenarchaeota and
Euryarchaeota, or as the sister group to eukarya. If additional data confirm
either of the latter two placements, then the organisms represented by these
ribosomal RNA sequences would xcognition as a new kingdom.
Figures:
Click to view or download:
1620 character ('large') alignment
(UNIX) in Nexus format
1620 character ('large') alignment
(Mac) in Nexus format
922 character ('small') alignment
(UNIX) in Nexus format
922 character ('small') alignment
(Mac) in Nexus format
Tree topology found by maximum
likelihood analysis (in Nexus format)
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