title: Chicken ovalbumin promoter is demethylated upon expression in the regions specifically involved in estrogen-responsiveness.
abstract: Here we report the methylation status of the chicken ovalbumin promoter. Genomic DNA of oviduct from immature chickens and laying hens was analyzed through bisulfite genomic sequencing. In the ovalbumin control locus up to the 6 kb upstream region, CpG sites were methylated in immature chickens, except for several sites, and almost all CpGs residing in DNase I hypersensitive sites I, II, and III, but not IV, were selectively unmethylated in ovalbumin expressing chickens. Chromatin immunoprecipitation assays showed that the ovalbumin control region was associated with acetylated histone H3 but not with dimethylated histone H3 at Lys 27. These results demonstrate that DNA demethylation was restricted to short DNA regions of DNase I hypersensitive sites, especially to those which participated in estrogen-responsiveness, even when cells expressed extremely high levels of ovalbumin and these sites were associated with acetylated histones.
authors.affiliation: Department of Biotechnology, Graduate School of Engineering, Nagoya University.
authors.forename: Mahboob
authors.initials: M
authors.lastname: Morshed
authors.forename: Shusuke
authors.initials: S
authors.lastname: Sano
authors.forename: Daisuke
authors.initials: D
authors.lastname: Nishimiya
authors.forename: Munetoshi
authors.initials: M
authors.lastname: Ando
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Nishijima
authors.forename: Shinji
authors.initials: S
authors.lastname: Iijima
mesh_terms: D000107:Acetylation; D000818:Animals; D002645:Chickens / Q000235:genetics*; D019175:DNA Methylation / Q000187:drug effects*; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects*; D006657:Histones / Q000378:metabolism; D008239:Lysine / Q000378:metabolism; D010047:Ovalbumin / Q000235:genetics*; D010057:Oviducts / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000235:genetics*
chemical_list: D004967:Estrogens; D006657:Histones; D010047:Ovalbumin; D008239:Lysine