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The <jats:italic>IgH<\/jats:italic> constant locus contains multiple genes controlled by isotype (I) promoters induced by extracellular signals that activate specific I promoters, leading to B cell commitment. However, it is unknown whether after initial commitment to one promoter, non-responsive I promoters are irreversibly silent or if they can be activated after exposure to their specific inducers. Here, we studied the murine cell line CH12, which is committed to produce IgA in response to TGF-\u03b2. We show that, although other promoters than I\u03b1 are transcriptionally inactive, they are not irreversibly silent. Following deletion of the committed I\u03b1 promoter by CRISPR\/Cas9, other I promoters display a complex transcriptional pattern largely dependent on the initial committing signal.<\/jats:p>","DOI":"10.1038\/s41598-019-54929-x","type":"journal-article","created":{"date-parts":[[2019,12,6]],"date-time":"2019-12-06T11:02:54Z","timestamp":1575630174000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Essential role of the initial activation signal in isotype selection upon deletion of a transcriptionally committed promoter"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5411-4439","authenticated-orcid":false,"given":"Joana M.","family":"Santos","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chlo\u00e9","family":"Oudinet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lisa","family":"Sch\u00f6ne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Audrey","family":"Dauba","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6523-2035","authenticated-orcid":false,"given":"Ahmed Amine","family":"Khamlichi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,12,6]]},"reference":[{"key":"54929_CR1","doi-asserted-by":"publisher","first-page":"751","DOI":"10.1038\/381751a0","volume":"381","author":"K Rajewsky","year":"1996","unstructured":"Rajewsky, K. 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