title: The control of natural variation in cytosine methylation in Arabidopsis.
abstract: We explore the extent and sources of epigenetic variation in cytosine methylation in natural accessions of the flowering plant, Arabidopsis thaliana, by focusing on the methylation of the major rRNA gene repeats at the two nucleolus organizer regions (NOR). Our findings indicate that natural variation in NOR methylation results from a combination of genetic and epigenetic mechanisms. Genetic variation in rRNA gene copy number and trans-acting modifier loci account for some of the natural variation in NOR methylation. Our results also suggest that divergence and inheritance of epigenetic information, independent of changes in underlying nucleotide sequence, may play an important role in maintaining natural variation in cytosine methylation.
authors.affiliation: Department of Biology, Washington University, Saint Louis, Missouri 63130, USA.
authors.forename: Nicole C
authors.initials: NC
authors.lastname: Riddle
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Richards
mesh_terms: D017360:Arabidopsis / Q000235:genetics*; D015139:Blotting, Southern; D003596:Cytosine / Q000378:metabolism*; D019175:DNA Methylation; D014644:Genetic Variation; D040641:Quantitative Trait Loci; D012335:RNA, Ribosomal / Q000235:genetics
chemical_list: D012335:RNA, Ribosomal; D003596:Cytosine