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GC-content of genomes - a trap for cladists?

Steffen Schmidt sschmid2 at ubmgnts1.Uni-MolGen.gwdg.de
Thu Feb 25 16:51:41 EST 1999

I'am looking for ideas and papers about the following statement which is
possibly wrong (but why?):
Most people think, that the last common ancestor was a thermophilic
organism (e.g. Woese et al.) because of  sequence comparisons. As far as
I know - that's not a lot - all these comparision algorithm do rely on
the fact that there is no selection on the level of the nucleotides. But
one believes also that thermophilic organism do need a higher GC-content
in order to live in their various habitats. So this would possibly mean
that the adaption of organism towards higher temperatures occured more
often and that therefore one has to find the last common ancestor with
other kind of comparisons?

Steffen Schmidt

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