Molecular Biology and Evolution, Vol 14, 867-874, Copyright © 1997 by Society for Molecular Biology and Evolution
JL Staton, LL Daehler and WM Brown
Numerous complete mitochondrial DNA sequences have been determined for
species within two arthropod groups, insects and crustaceans, but there are
none for a third, the chelicerates. Most mitochondrial gene arrangements
reported for crustaceans and insect species are identical or nearly
identical to that of Drosophila yakuba. Sequences across 36 of the gene
boundaries in the mitochondrial DNA (mtDNA) of a representative
chelicerate. Limulus polyphemus L., also reveal an arrangement like that of
Drosophila yakuba. Only the position of the tRNA(LEU)(UUR) gene differs; in
Limulus it is between the genes for tRNA(LEU)(CUN) and ND1. This
positioning is also found in onychophorans, mollusks, and annelids, but not
in insects and crustaceans, and indicates that
tRNA(LEU)(CUN)-tRNA(LEU)(UUR)-ND1 was the ancestral gene arrangement for
these groups, as suggested earlier. There are no differences in the
relative arrangements of protein-coding and ribosomal RNA genes between
Limulus and Drosophila, and none have been observed within arthropods. The
high degree of similarity of mitochondrial gene arrangements within
arthropods is striking, since some taxa last shared a common ancestor
before the Cambrian, and contrasts with the extensive mtDNA rearrangements
occasionally observed within some other metazoan phyla (e.g., mollusks and
nematodes).
ORIGINAL ARTICLE
Mitochondrial gene arrangement of the horseshoe crab Limulus polyphemus L.: conservation of major features among arthropod classes
Department of Biology, University of Michigan, USA. jaston@ucla.edu
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