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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
general
Deconstruction of the (paleo)polyploid grapevine genome based on the analysis of transposition events involving NBS resistance genes
PLoS ONE, Volume 7, No. 1, Article e29762, Year 2012
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Description
Plants have followed a reticulate type of evolution and taxa have frequently merged via allopolyploidization. A polyploid structure of sequenced genomes has often been proposed, but the chromosomes belonging to putative component genomes are difficult to identify. The 19 grapevine chromosomes are evolutionary stable structures: their homologous triplets have strongly conserved gene order, interrupted by rare translocations. The aim of this study is to examine how the grapevine nucleotide-binding site (NBS)-encoding resistance (NBS-R) genes have evolved in the genomic context and to understand mechanisms for the genome evolution. We show that, in grapevine, i) helitrons have significantly contributed to transposition of NBS-R genes, and ii) NBS-R gene cluster similarity indicates the existence of two groups of chromosomes (named as Va and Vc) that may have evolved independently. Chromosome triplets consist of two Va and one Vc chromosomes, as expected from the tetraploid and diploid conditions of the two component genomes. The hexaploid state could have been derived from either allopolyploidy or the separation of the Va and Vc component genomes in the same nucleus before fusion, as known for Rosaceae species. Time estimation indicates that grapevine component genomes may have fused about 60 mya, having had at least 40-60 mya to evolve independently. Chromosome number variation in the Vitaceae and related families, and the gap between the time of eudicot radiation and the age of Vitaceae fossils, are accounted for by our hypothesis. © 2012 Malacarne et al.
Authors & Co-Authors
Malacarne, Giulia
Italy, San Michele All'adige
Fondazione Edmund Mach
Perazzolli, Michele
Italy, San Michele All'adige
Fondazione Edmund Mach
Cestaro, Alessandro
Italy, San Michele All'adige
Fondazione Edmund Mach
Sterck, Lieven
Belgium, Ghent
Vlaams Instituut Voor Biotechnologie
Belgium, Ghent
Universiteit Gent
Van de Peer, Y.
Belgium, Ghent
Vlaams Instituut Voor Biotechnologie
Belgium, Ghent
Universiteit Gent
Viola, Roberto E.
Italy, San Michele All'adige
Fondazione Edmund Mach
Velasco, R.
Italy, San Michele All'adige
Fondazione Edmund Mach
Salamini, Francesco O.
Italy, San Michele All'adige
Fondazione Edmund Mach
Statistics
Citations: 28
Authors: 8
Affiliations: 3
Identifiers
Doi:
10.1371/journal.pone.0029762
ISSN:
19326203
Research Areas
Cancer
Genetics And Genomics