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Madan, Vikas; Kanojia, Deepika; Li, Jia; Okamoto, Ryoko; Sato-Otsubo, Aiko; Kohlmann, Alexander; Sanada, Masashi; Grossmann, Vera; Sundaresan, Janani; Shiraishi, Yuichi; Miyano, Satoru; Thol, Felicitas; Ganser, Arnold; Yang, Henry; Haferlach, Torsten; Ogawa, Seishi; Koeffler, H Phillip
Nature communications, 01/2015, Volume: 6, Issue: 1Journal Article
Somatic mutations in the spliceosome gene ZRSR2-located on the X chromosome-are associated with myelodysplastic syndrome (MDS). ZRSR2 is involved in the recognition of 3'-splice site during the early stages of spliceosome assembly; however, its precise role in RNA splicing has remained unclear. Here we characterize ZRSR2 as an essential component of the minor spliceosome (U12 dependent) assembly. shRNA-mediated knockdown of ZRSR2 leads to impaired splicing of the U12-type introns and RNA-sequencing of MDS bone marrow reveals that loss of ZRSR2 activity causes increased mis-splicing. These splicing defects involve retention of the U12-type introns, while splicing of the U2-type introns remain mostly unaffected. ZRSR2-deficient cells also exhibit reduced proliferation potential and distinct alterations in myeloid and erythroid differentiation in vitro. These data identify a specific role for ZRSR2 in RNA splicing and highlight dysregulated splicing of U12-type introns as a characteristic feature of ZRSR2 mutations in MDS.
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