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Here we evaluate the therapeutic activity and structural requirements of these exon-specific U1 snRNA (ExSpeU1) particles. In a severe spinal muscular atrophy, mouse model, ExSpeU1, introduced by germline transgenesis, increases SMN2 exon 7 inclusion, SMN protein production and extends life span. <jats:italic>In vitro<\/jats:italic>, RNA mutant analysis and silencing experiments show that while U1A protein is dispensable, the 70K and stem loop IV elements mediate most of the splicing rescue activity through improvement of exon and intron definition. Our findings indicate that precise engineering of the U1 core spliceosomal RNA particle has therapeutic potential in pathologies associated with exon-skipping mutations.<\/jats:p>","DOI":"10.1038\/ncomms11168","type":"journal-article","created":{"date-parts":[[2016,4,4]],"date-time":"2016-04-04T09:26:58Z","timestamp":1459762018000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":68,"title":["Therapeutic activity of modified U1 core spliceosomal particles"],"prefix":"10.1038","volume":"7","author":[{"given":"Malgorzata Ewa","family":"Rogalska","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mojca","family":"Tajnik","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Danilo","family":"Licastro","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Erica","family":"Bussani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luca","family":"Camparini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chiara","family":"Mattioli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Franco","family":"Pagani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2016,4,4]]},"reference":[{"key":"BFncomms11168_CR1","doi-asserted-by":"publisher","first-page":"a003707","DOI":"10.1101\/cshperspect.a003707","volume":"3","author":"CL Will","year":"2011","unstructured":"Will, C. 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