Molecular Biology and Evolution, Vol 15, 225-235, Copyright © 1998 by Society for Molecular Biology and Evolution
BN Danforth and S Ji
We report the complete sequence of a paralogous copy of elongation factor-1
alpha (EF-1 alpha) in the honeybee, Apis mellifera (Hymenoptera: Apidae).
This copy differs from a previously described copy in the positions of five
introns and in 25% of the nucleotide sites in the coding regions. The
existence of two paralogous copies of EF-1 alpha in Drosophila and Apis
suggests that two copies of EF-1 alpha may be widespread in the
holometabolous insect orders. To distinguish between a single, ancient gene
duplication and parallel, independent fly and bee gene duplications, we
performed a phylogenetic analysis of hexapod EF-1 alpha sequences.
Unweighted parsimony analysis of nucleotide sequences suggests an ancient
gene duplication event, whereas weighted parsimony analysis of nucleotides
and unweighted parsimony analysis of amino acids suggests the contrary:
that EF-1 alpha underwent parallel gene duplications in the Diptera and the
Hymenoptera. The hypothesis of parallel gene duplication is supported both
by congruence among nucleotide and amino acid data sets and by
topology-dependent permutation tail probability (T-PTP) tests. The
resulting tree topologies are also congruent with current views on the
relationships among the holometabolous orders included in this study
(Diptera, Hymenoptera, and Lepidoptera). More sequences, from diverse
orders of holometabolous insects, will be needed to more accurately assess
the historical patterns of gene duplication in EF-1 alpha.
ORIGINAL ARTICLE
Elongation factor-1 alpha occurs as two copies in bees: implications for phylogenetic analysis of EF-1 alpha sequences in insects
Department of Entomology, Cornell University, Ithaca, New York 14853- 0901, USA. bnd1@cornell.edu
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