title: Genomic legacies of the progenitors and the evolutionary consequences of allopolyploidy.
abstract: The formation of an allopolyploid species involves the merger of genomes with separate evolutionary histories and thereby different genomic legacies. Contrary to expectations from theory, genes from one are often lost preferentially in allopolyploids - there is biased fractionation. Here, we provide an overview of two ways in which the genomic legacies of the progenitors may impact the fate of duplicated genes in allopolyploids. Specifically, we discuss the role of homeolog expression biases in setting the stage for biased fractionation, and the evidence for transposable element silencing as a possible mechanism for homeolog expression biases. Finally, we highlight how differences between the progenitors with respect to accumulation of deleterious variation may affect trajectories of duplicate gene evolution in allopolyploids.
authors.affiliation: Department of Ecology and Genetics, Uppsala University, Sweden; Department of Ecology, Environment and Plant Sciences, Science for Life Laboratory, Stockholm University, Sweden.
authors.forename: Kim A
authors.initials: KA
authors.lastname: Steige
authors.affiliation: Department of Ecology, Environment and Plant Sciences, Science for Life Laboratory, Stockholm University, Sweden. Electronic address: Tanja.Slotte@su.se.
authors.forename: Tanja
authors.initials: T
authors.lastname: Slotte
mesh_terms: D004251:DNA Transposable Elements / Q000235:genetics* / Q000502:physiology; D019143:Evolution, Molecular; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D018745:Genome, Plant / Q000235:genetics*; D011123:Polyploidy
chemical_list: D004251:DNA Transposable Elements