Molecular Biology and Evolution, Vol 8, 155-184, Copyright © 1991 by Society for Molecular Biology and Evolution
WJ Bailey, DH Fitch, DA Tagle, J Czelusniak, JL Slightom and M Goodman
An 8.4-kb genomic region spanning both the psi eta-globin gene locus and
flanking DNA was sequenced from the common gibbon (Hylobates lar). In
addition, sequencing of the entire orthologous region from galago (Galago
crassicaudatus) was completed. The gibbon and galago sequences, along with
published orthologous sequences from 10 other species, were aligned. These
noncoding nucleotide sequences represented four human alleles, four apes
(chimpanzee, gorilla, organgutan, and gibbon), an Old World monkey (rhesus
monkey), two New World monkeys (spider and owl monkeys), tarsier, two
strepsirhines (galago and lemur), and goat. Divergence and maximum
parsimony analyses of the psi eta genomic region first groups humans and
chimpanzees and then, at progressively more ancient branch points,
successively joins gorillas, orangutans, gibbons, Old World monkeys, New
World monkeys, tarsiers, and strepsirhines (the lemuriform-lorisiform
branch of primates). This cladistic pattern supports the taxonomic grouping
of all extant hominoids into family Hominidae, the division of Hominidae
into subfamilies Hylobatinae (gibbons) and Homininae, the division of
Homininae into tribes Pongini (orangutans) and Hominini, and the division
of Hominini into subtribes Gorillina (gorillas) and Hominina (chimpanzees
and humans). The additional gibbon and galago sequence data provide further
support for the occurrence of a graded evolutionary-rate slowdown in the
descent of simian primates, with the slowing rate being more pronounced in
the great-ape and human lineages than in the gibbon or monkey lineages. A
comparison of global versus local molecular clocks reveals that local clock
predictions, when focused on a specific number of species within a narrow
time frame, provide a more accurate estimate of divergence dates than do
those of global clocks.
ORIGINAL ARTICLE
Molecular evolution of the psi eta-globin gene locus: gibbon phylogeny and the hominoid slowdown
Department of Molecular Biology and Genetics, Wayne State University School of Medicine, Detroit, Michigan 48201.
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