An ancient genome duplication contributed to the abundance of metabolic genes in the moss Physcomitrella patens.
BACKGROUND
Analyses of complete genomes and large collections of gene transcripts have shown that most, if not all seed plants have undergone one or more genome duplications in their evolutionary past.


RESULTS
In this study, based on a large collection of EST sequences, we provide evidence that the haploid moss Physcomitrella patens is a paleopolyploid as well. Based on the construction of linearized phylogenetic trees we infer the genome duplication to have occurred between 30 and 60 million years ago. Gene Ontology and pathway association of the duplicated genes in P. patens reveal different biases of gene retention compared with seed plants.


CONCLUSIONS
Metabolic genes seem to have been retained in excess following the genome duplication in P. patens. This might, at least partly, explain the versatility of metabolism, as described for P. patens and other mosses, in comparison to other land plants.
Rensing
Stefan A
SA
Plant Biotechnology, Faculty of Biology, University of Freiburg, Freiburg, Germany. stefan.rensing@biologie.uni-freiburg.de
Ick
Julia
J
Fawcett
Jeffrey A
JA
Lang
Daniel
D
Zimmer
Andreas
A
Van de Peer
Yves
Y
Reski
Ralf
R
D019068:Bryopsida / Q000235:genetics* / Q000378:metabolism*; D019143:Evolution, Molecular; D020440:Gene Duplication; D018745:Genome, Plant / Q000235:genetics*; D053858:Metabolic Networks and Pathways / Q000235:genetics*; D010802:Phylogeny; D011123:Polyploidy