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Molecular Biology and Evolution, Vol 12, 657-670, Copyright © 1995 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Phylogenetic analyses of 55 retroelements on the basis of the nucleotide and product amino acid sequences of the pol gene

MD Li, DL Bronson, TD Lemke and AJ Faras
Institute of Human Genetics, University of Minnesota, USA.

Comparisons of pol gene nucleotide and reverse transcriptase (RT) amino acid sequences of 47 retroviruses, 3 caulimoviruses, and 5 hepadnaviruses showed that approximately one-third of the gene at the 5' end is much more conserved than other pol regions. The most conserved regions on both the nucleotide and amino acid sequences were chosen for construction of phylogenetic trees. The maximum-parsimony and distance-matrix methods were used for analyses of aligned amino acid sequences; these two methods, and the compatibility method, were used to analyze the aligned nucleotide sequences. Essentially identical majority-rule consensus trees were produced by these different methods from both the pol gene nucleotide and RT amino acid sequences, which divided the 55 retroelements into six major groups. The reliability of the phylogenetic trees was probed with the bootstrapping of 100 replicates of the original sequence alignments. The grouping results were shown to be statistically significant by multiple comparisons with the least-significant-difference procedure.
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