title: Heritable epigenetic variation among maize inbreds.
abstract: Epigenetic variation describes heritable differences that are not attributable to changes in DNA sequence. There is the potential for pure epigenetic variation that occurs in the absence of any genetic change or for more complex situations that involve both genetic and epigenetic differences. Methylation of cytosine residues provides one mechanism for the inheritance of epigenetic information. A genome-wide profiling of DNA methylation in two different genotypes of Zea mays (ssp. mays), an organism with a complex genome of interspersed genes and repetitive elements, allowed the identification and characterization of examples of natural epigenetic variation. The distribution of DNA methylation was profiled using immunoprecipitation of methylated DNA followed by hybridization to a high-density tiling microarray. The comparison of the DNA methylation levels in the two genotypes, B73 and Mo17, allowed for the identification of approximately 700 differentially methylated regions (DMRs). Several of these DMRs occur in genomic regions that are apparently identical by descent in B73 and Mo17 suggesting that they may be examples of pure epigenetic variation. The methylation levels of the DMRs were further studied in a panel of near-isogenic lines to evaluate the stable inheritance of the methylation levels and to assess the contribution of cis- and trans- acting information to natural epigenetic variation. The majority of DMRs that occur in genomic regions without genetic variation are controlled by cis-acting differences and exhibit relatively stable inheritance. This study provides evidence for naturally occurring epigenetic variation in maize, including examples of pure epigenetic variation that is not conditioned by genetic differences. The epigenetic differences are variable within maize populations and exhibit relatively stable trans-generational inheritance. The detected examples of epigenetic variation, including some without tightly linked genetic variation, may contribute to complex trait variation.
authors: Microbial and Plant Genomics Institute, Department of Plant Biology, University of Minnesota, Saint Paul, Minnesota, USA.
authors: Steve R
authors: SR
authors: Eichten
authors: Ruth A
authors: RA
authors: Swanson-Wagner
authors: James C
authors: JC
authors: Schnable
authors: Amanda J
authors: AJ
authors: Waters
authors: Peter J
authors: PJ
authors: Hermanson
authors: Sanzhen
authors: S
authors: Liu
authors: Cheng-Ting
authors: CT
authors: Yeh
authors: Yi
authors: Y
authors: Jia
authors: Karla
authors: K
authors: Gendler
authors: Michael
authors: M
authors: Freeling
authors: Patrick S
authors: PS
authors: Schnable
authors: Matthew W
authors: MW
authors: Vaughn
authors: Nathan M
authors: NM
authors: Springer
mesh_terms: D055028:Comparative Genomic Hybridization; D003596:Cytosine / Q000378:metabolism*; D056915:DNA Copy Number Variations; D019175:DNA Methylation / Q000235:genetics*; D044127:Epigenesis, Genetic; D018506:Gene Expression Regulation, Plant; D018745:Genome, Plant; D005838:Genotype; D007178:Inbreeding; D020411:Oligonucleotide Array Sequence Analysis; D011153:Population; D003313:Zea mays / Q000235:genetics*
chemical_list: D003596:Cytosine