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Scientific article
English

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

Published inNature genetics, vol. 34, no. 4, p. 450-454
Publication date2003
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
  • Alleles
  • Arabidopsis/drug effects/enzymology/genetics
  • Cinnamates
  • Crosses, Genetic
  • DNA Methylation
  • Diploidy
  • Drug Resistance/genetics
  • Evolution
  • Genes, Plant
  • Hygromycin B/analogs & derivatives/pharmacology
  • Mutation
  • Phosphotransferases (Alcohol Group Acceptor)/genetics
  • Polyploidy
Affiliation Not a UNIGE publication
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. 450–454. doi: 10.1038/ng1210
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Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal1061-4036
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