Molecular Biology and Evolution, Vol 14, 474-484, Copyright © 1997 by Society for Molecular Biology and Evolution
IB Jakobsen, SR Wilson and S Easteal
The partition matrix is a graphical tool for comparative analysis of
nucleotide sequences following alignment. It is particularly useful for
investigating the divergent phylogenies of sequence regions undergoing
reticulate evolution. A partition matrix is generated by determining the
consistency of the parsimoniously informative sites in a set of aligned
sequences with the binary partitions inferred from the sequences. Since the
linear order of sites is maintained, the matrix can be used to assess
whether the distribution of sites either supporting or conflicting with
particular partitions changes along the length of the alignment. The
usefulness of the matrix in allowing visual identification of differences
in evolutionary history among regions depends on the order in which
partitions are shown; several suitable ordering schemes are proposed. We
demonstrate the use of the partition matrix in interpreting the evolution
of the pseudoautosomal boundary region on the sex chromosome of catarrhine
primates. Its routine use should help to avoid attempts to derive single
phylogenies from sequences whose evolution has been reticulate and to
identify the gene conversion or recombination events underlying the
reticulation. The method is relatively fast. It is exploratory, and it can
form the basis for more formal analysis, which we discuss.
ORIGINAL ARTICLE
The partition matrix: exploring variable phylogenetic signals along nucleotide sequence alignments
Human Genetics Group, John Curtin School of Medical Research, Australian National University, Canberra, Australia. ingrid@jcsmr.anu.edu.au
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