title: DNA methylation analysis of a male reproductive organ specific gene (MROS1) during pollen development.
abstract: Pollen grains of angiosperm plants represent a good model system for studies of chromatin structure and remodelling factors, but very little is known about the DNA methylation status of particular genes in pollen. In this study, we present an analysis of the DNA methylation patterns of the MROS1 gene, which is expressed in the late phases of pollen development in Silene latifolia (syn. Meladrium album). The genomic sequencing technique revealed similar DNA methylation patterns in leaves, binucleate pollen, and trinucleate pollen. Extremely high DNA methylation levels occurred in the CG dinucleotides of the upstream region (99%), whereas only a low level of CG methylation was observed in the transcribed sequence (7%). Low levels of methylation were also observed in asymmetric sequences (in both regions; 2% methylated). The results obtained in the MROS1 gene are discussed in consequence with the immunohistochemical data showing a hypermethylation of DNA in the vegetative nucleus.
authors.affiliation: Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno. janousek@ibp.cz
authors.forename: Bohuslav
authors.initials: B
authors.lastname: Janousek
authors.forename: Sachihiro
authors.initials: S
authors.lastname: Matsunaga
authors.forename: Eduard
authors.initials: E
authors.lastname: Kejnovsky
authors.forename: Jitka
authors.initials: J
authors.lastname: Ziuvova
authors.forename: Boris
authors.initials: B
authors.lastname: Vyskot
mesh_terms: D001483:Base Sequence; D019175:DNA Methylation; D018744:DNA, Plant / Q000737:chemistry* / Q000235:genetics*; D017343:Genes, Plant; D018745:Genome, Plant; D007150:Immunohistochemistry; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics*; D011058:Pollen / Q000737:chemistry / Q000235:genetics / Q000254:growth & development; D011401:Promoter Regions, Genetic; D012689:Sequence Homology, Nucleic Acid; D029751:Silene / Q000737:chemistry / Q000235:genetics* / Q000254:growth & development*; D013045:Species Specificity; D014018:Tissue Distribution
chemical_list: D018744:DNA, Plant; C106941:MEN-1 protein, Silene latifolia; D010940:Plant Proteins