Duplicate genes and the root of angiosperms, with an example using phytochrome sequences

TitleDuplicate genes and the root of angiosperms, with an example using phytochrome sequences
Publication TypeJournal Article
Year of Publication1998
AuthorsDonoghue MJ, Mathews S
JournalMolecular Phylogenetics and Evolution
Pagination489 - 500
KeywordsAngiosperms/*classification, Angiosperms/*genetics, Genes, Genetic, Models, Multigene Family*, Phylogeny*, Phytochrome/*genetics, Plant Roots, Plant*

The root of the angiosperm tree has not yet been established. Major morphological and molecular differences between angiosperms and other seed plants have introduced ambiguities and possibly spurious results. Because it is unlikely that extant species more closely related to angiosperms will be discovered, and because relevant fossils will almost certainly not yield molecular data, the use of duplicate genes for rooting purposes may provide the best hope of a solution. Simultaneous analysis of the genes resulting from a gene duplication event along the branch subtending angiosperms would yield an unrooted network, wherein two congruent gene trees should be connected by a single branch. In these circumstances the best rooted species tree is the one that corresponds to the two gene trees when the network is rooted along the connecting branch. In general, this approach can be viewed as choosing among rooted species trees by minimizing hypothesized events such as gene duplication, gene lo