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Decreased DNA methylation of <jats:italic>OAS2<\/jats:italic> (2\u2032-5\u2032-Oligoadenylate Synthetase 2), encoding an antiviral protein, has been seen in psoriasis. To provide further insight into the epigenetic regulation of <jats:italic>OAS2<\/jats:italic>, we performed pyrosequencing to detect <jats:italic>OAS2<\/jats:italic> DNA methylation status at 11 promoter and first exon located CpG sites in psoriasis (n\u2009=\u200912) and two common subtypes of squamous cell carcinoma (SCC) of the head and neck: tongue (n\u2009=\u200912) and tonsillar (n\u2009=\u200911). Compared to corresponding controls, a general hypomethylation was seen in psoriasis. In tongue and tonsillar SCC, hypomethylation was found at only two CpG sites, the same two sites that were least demethylated in psoriasis. Despite differences in the specific residues targeted for methylation\/demethylation, <jats:italic>OAS2<\/jats:italic> expression was upregulated in all conditions and correlations between methylation and expression were seen in psoriasis and tongue SCC. Distinctive methylation status at four successively located CpG sites within a genomic area of 63\u2009bp reveals a delicately integrated epigenetic program and indicates that detailed analysis of individual CpGs provides additional information into the mechanisms of epigenetic regulation in specific disease states. Methylation analyses as clinical biomarkers need to be tailored according to disease-specific sites.<\/jats:p>","DOI":"10.1038\/srep32579","type":"journal-article","created":{"date-parts":[[2016,8,30]],"date-time":"2016-08-30T09:26:12Z","timestamp":1472549172000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Epigenetic regulation of OAS2 shows disease-specific DNA methylation profiles at individual CpG sites"],"prefix":"10.1038","volume":"6","author":[{"given":"Xiaolian","family":"Gu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linda","family":"Boldrup","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Philip J.","family":"Coates","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robin","family":"Fahraeus","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elisabet","family":"Nylander","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christos","family":"Loizou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katarina","family":"Olofsson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lena","family":"Norberg-Spaak","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ola","family":"G\u00e4rskog","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karin","family":"Nylander","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2016,8,30]]},"reference":[{"key":"BFsrep32579_CR1","doi-asserted-by":"publisher","first-page":"477","DOI":"10.1038\/nature12433","volume":"500","author":"MJ Ziller","year":"2013","unstructured":"Ziller, M. 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