Molecular Biology and Evolution, Vol 14, 843-853, Copyright © 1997 by Society for Molecular Biology and Evolution
WJ Bailey, J Kim, GP Wagner and FH Ruddle
In vertebrates and the cephalochordate, amphioxus, the closest vertebrate
relative, Hox genes are linked in a single cluster. Accompanying the
emergence of higher vertebrates, the Hox gene cluster duplicated in either
a single step or multiple steps, resulting in the four-cluster state
present in teleosts and tetrapods. Mammalian Hox clusters (designated A, B,
C, and D) extend over 100 kb and are located on four different chromosomes.
Reconstructing the history of the duplications and its relation to
vertebrate evolution has been problematic due to the lack of alignable
sequence information. In this study, the problem was approached by
conducting a statistical analysis of sequences from the fibrillar-type
collagens (I, II, III, and IV), genes closely linked to each Hox cluster
which likely share the same duplication history as the Hox genes. We find
statistical support for the hypothesis that the cluster duplication
occurred as multiple distinct events and that the four-cluster situation
arose by a three- step sequential process.
ORIGINAL ARTICLE
Phylogenetic reconstruction of vertebrate Hox cluster duplications
Department of Biology, Yale University, New Haven, Connecticut 06520- 8103.
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