Scientific Article
previous document  unige:6835  next document
add to browser collection
Title

Formation of stable epialleles and their paramutation-like interaction in tetraploid Arabidopsis thaliana

Authors
Mittelsten Scheid, Ortrun
Afsar, Karin
Published in Nature Genetics. 2003, vol. 34, no. 4, p. 450-4
Abstract Polyploidization is found frequently in plants, and species previously considered to be diploid may show remnants of earlier polyploidization events on closer inspection of their genomes. The success of polyploids may lie in increased genetic redundancy supporting subsequent genetic diversification. Although doubling the genome does not generate diversity per se, recent studies show that rapid genomic rearrangements and changes in DNA modification and gene expression patterns are associated with polyploid formation. But recessive modifications will not become phenotypically apparent in early polyploid generations. Here we show that epialleles in tetraploid plants (but not in diploids) interact in trans and lead to heritable gene silencing persisting after segregation from the inactivating allele. This mechanism, resembling paramutation, leads to the establishment of functional epigenetic homozygosity and, thus, to conversion of new recessive alleles into traits expressed in early polyploid generations. Such interactions probably contribute to rapid adaptation and evolution of polyploid plant species.
Keywords AllelesArabidopsis/drug effects/enzymology/geneticsCinnamatesCrosses, GeneticDNA MethylationDiploidyDrug Resistance/geneticsEvolutionGenes, PlantHygromycin B/analogs & derivatives/pharmacologyMutationPhosphotransferases (Alcohol Group Acceptor)/geneticsPolyploidy
Identifiers
PMID: 12847525
Full text
Article (Published version) (2.6 MB) - document accessible for UNIGE members only Limited access to UNIGE
Citation
(ISO format)
MITTELSTEN SCHEID, Ortrun, AFSAR, Karin, PASZKOWSKI, Jerzy. Formation of stable epialleles and their paramutation-like interaction in tetraploid Arabidopsis thaliana. In: Nature Genetics, 2003, vol. 34, n° 4, p. 450-4. https://archive-ouverte.unige.ch/unige:6835

167 hits

0 download

Update

Deposited on : 2010-06-10

Export document
Format :
Citation style :