Partial vs. whole trees

Ulrich Melcher biocukm at OKWAY.OKSTATE.EDU
Wed Mar 10 18:30:37 EST 1993


For some viruses (apparently including the geminiviruses that Ed mentioned), 
identical trees may result when parts of the genome and the whole genome are 
analyzed.  However, be careful of hasty generalizations.  Kelly Chenault and I 
have constructed gene and species trees for cauliflower mosaic virus (CaMV) 
isolates.  We find several differences, most of which can be explained by 
recombination events.

BTW, one of the more puzzling differences we find is that the sequence of a 
related virus for some genes comes out with one cluster of isolates and for 
other genes with a completely different cluster.  The best interpretation that 
I can muster at the moment is that CaMV is ancestral to the related virus, the 
latter having diverged from one of several pre-existing CaMV lineages.  A 
subsequent recombination event between CaMV lineages would then give the 
progenitors to the isolates we are looking at.  Any other explanations I can 
think of invoke convergent evolution, which I am reluctant to do.  If any of 
you have other ideas, I'd like to consider them.

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