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Molecular Biology and Evolution, Vol 9, 575-586, Copyright © 1992 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

DNA sequence polymorphism within hominoid species exceeds the number of phylogenetically informative characters for a HOX2 locus

G Ruano, J Rogers, AC Ferguson-Smith and KK Kidd
Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510.

Within- and between-species variability was examined in a noncoding 238- bp segment of the HOX2 cluster. DNA of 4-26 individuals of four species (Pongo pygmaeus, Pan troglodytes, Gorilla gorilla, and Homo sapiens) was PCR amplified and electrophoresed in a denaturing gradient gel to screen for variability. Coupled amplification and sequencing was used to determine the complete sequence for each of the different alleles identified, one each in humans and orangutans, two in chimpanzees, and four in gorillas. Maximum-parsimony methods were used to construct a gene tree for these sequences. Alleles in all four species cluster into groups consisting of only one species (i.e., alleles within a species are monophyletic). The number of base-pair differences observed among alleles within P. troglodytes and within G. gorilla is larger than the number of base-pair substitutions that phylogenetically link Pan with Homo. Given these and other published data, it is premature to accept any particular phylogenetic tree that relates these three genera through two separate speciation events.
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