Molecular Biology and Evolution, Vol 12, 782-793, Copyright © 1995 by Society for Molecular Biology and Evolution
T Hashimoto, Y Nakamura, T Kamaishi, F Nakamura, J Adachi, K Okamoto and M Hasegawa
Partial regions of the mRNA encoding a major part of translation elongation
factor 2 (EF-2) from a mitochondrion-lacking protozoan, Giardia lamblia,
were amplified by polymerase chain reaction, and their primary structures
were analyzed. The deduced amino acid sequence was aligned with other
eukaryotic and archaebacterial EF-2's, and the phylogenetic relationships
among eukaryotes were inferred by the maximum likelihood (ML) and the
maximum parsimony (MP) methods. The ML analyses using six different models
of amino acid substitutions and the MP analysis consistently suggest that
among eukaryotic species being analyzed, G. lamblia is likely to have
diverged from other higher eukaryotes on the early phase of eukaryotic
evolution.
ORIGINAL ARTICLE
Phylogenetic place of mitochondrion-lacking protozoan, Giardia lamblia, inferred from amino acid sequences of elongation factor 2
Graduate University for Advanced Studies, Institute of Statistical Mathematics, Tokyo, Japan.
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