Gene Conversion in Angiosperm Genomes with an Emphasis on Genes Duplicated by PolyploidizationReportar como inadecuado




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1

Plant Genome Mapping Laboratory, University of Georgia, Athens, GA 30602, USA

2

Center for Genomics and Computational Biology, School of Life Sciences and School of Sciences, Hebei United University, Tangshan, Hebei 063009, China





*

Authors to whom correspondence should be addressed.



Abstract Angiosperm genomes differ from those of mammals by extensive and recursive polyploidizations. The resulting gene duplication provides opportunities both for genetic innovation, and for concerted evolution. Though most genes may escape conversion by their homologs, concerted evolution of duplicated genes can last for millions of years or longer after their origin. Indeed, paralogous genes on two rice chromosomes duplicated an estimated 60–70 million years ago have experienced gene conversion in the past 400,000 years. Gene conversion preserves similarity of paralogous genes, but appears to accelerate their divergence from orthologous genes in other species. The mutagenic nature of recombination coupled with the buffering effect provided by gene redundancy, may facilitate the evolution of novel alleles that confer functional innovations while insulating biological fitness of affected plants. A mixed evolutionary model, characterized by a primary birth-and-death process and occasional homoeologous recombination and gene conversion, may best explain the evolution of multigene families. View Full-Text

Keywords: Non-allelic ectopic gene conversion; gene duplication; illegitimate recombination; angiosperm; grass Non-allelic ectopic gene conversion; gene duplication; illegitimate recombination; angiosperm; grass





Autor: Xi-Yin Wang 1,2,* and Andrew H. Paterson 1,*

Fuente: http://mdpi.com/



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