Molecular Biology and Evolution, Vol 9, 1018-1028, Copyright © 1992 by Society for Molecular Biology and Evolution
U Arnason, S Gretarsdottir and B Widegren
The genomes of all extant cetaceans are characterized by the presence of
the so-called common cetacean DNA satellite. In the mysticetes (whalebone
whales) the repeat length of the satellite is 1,760 bp. In the odontocetes
(toothed whales), other than the family Delphinidae, the repeat length is
usually approximately 1,740 bp. The Delphinidae are characterized by a
repeat length of approximately 1,580 bp. It has been shown in odontocetes
that the satellite evolves in concert and that differences between species,
with respect to the sequence of the satellite, correspond reasonably well
to their evolutionary distances. In the present study the sequence of the
satellite was determined in three repeats in each of seven mysticete
species, and a consensus for each species established. Parsimony and
neighbor-joining analyses based upon sequences of all repeats showed that
the primary evolutionary distinction among the mysticetes is between the
Balaenidae sensu stricto (i.e., the bowhead whale and the right whale) and
all remaining species, including the pygmy right whale, a species that
usually has been included in the Balaenidae. The comparisons also showed
that the humpback whale and the gray whale were approximately equidistant
from the blue whale and the fin whale (genus Balaenoptera). Concerted
evolution of the satellite was also demonstrated among the mysticetes, but
it appeared to evolve more slowly in the mysticetes than in the
odontocetes.
ORIGINAL ARTICLE
Mysticete (baleen whale) relationships based upon the sequence of the common cetacean DNA satellite
Department of Molecular Genetics, Wallenberg Laboratory, University of Lund, Sweden.
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