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TitleEvolutionary Genetics of Genome Merger and Doubling in Plants
AuthorsJeff J. Doyle, Lex E. Flagel, Andrew H. Paterson,Ryan A. Rapp, Douglas E. Soltis, Pamela S. Soltis,and Jonathan F.Wendel
PublicationAnnu. Rev. Genet. 2008. 42:443-61
AbstractPolyploidy is a common mode of evolution in flowering plants. The
profound effects of polyploidy on gene expression appear to be caused
more by hybridity than by genome doubling. Epigenetic mechanisms
underlying genome-wide changes in expression are as yet poorly understood;
only methylation has received much study, and its importance
varies among polyploids. Genetic diploidization begins with the earliest
responses to genome merger and doubling; less is known about chromosomal
diploidization. Polyploidy duplicates every gene in the genome,
providing the raw material for divergence or partitioning of function
in homoeologous copies. Preferential retention or loss of genes occurs
in a wide range of taxa, suggesting that there is an underlying set of
principles governing the fates of duplicated genes. Further studies are
required for general patterns to be elucidated, involving different plant
families, kinds of polyploidy, and polyploids of different ages.

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