2026-04-17T14:14:36Zhttps://recercat.cat/oai/request

oai:recercat.cat:10230/364892025-12-19T22:59:45Zcom_2072_6col_2072_452952

00925njm 22002777a 4500 dc Heras, Sara R. author Macias, Sara author Plass Pórtulas, Mireya, 1982- author Fernandez, Noemí author Cano Ferrer, David author Eyras Jiménez, Eduardo author Garcia Perez, José L. author Cáceres, Javier F. author 2019-02-04T15:26:58Z 2019-02-04T15:26:58Z 2013 More than half of the human genome is made of transposable elements whose ongoing mobilization is a driving force in genetic diversity; however, little is known about how the host regulates their activity. Here, we show that the Microprocessor (Drosha-DGCR8), which is required for microRNA biogenesis, also recognizes and binds RNAs derived from human long interspersed element 1 (LINE-1), Alu and SVA retrotransposons. Expression analyses demonstrate that cells lacking a functional Microprocessor accumulate LINE-1 mRNA and encoded proteins. Furthermore, we show that structured regions of the LINE-1 mRNA can be cleaved in vitro by Drosha. Additionally, we used a cell culture–based assay to show that the Microprocessor negatively regulates LINE-1 and Alu retrotransposition in vivo. Altogether, these data reveal a new role for the Microprocessor as a post-transcriptional repressor of mammalian retrotransposons and a defender of human genome integrity. S.R.H. was supported by a Marie Curie Intra-European Fellowship and a Marie Curie CIG-Grant (PCIG10-GA-2011-303812). M.P. and E.E. were supported by the Spanish Ministry of Science (BIO2011-23920) and by the Sandra Ibarra Foundation (CSD2009-00080). M.P. is supported by the Novo Nordisk Foundation. J.L.G.-P. is supported by FP7-PEOPLE-2007-4-3-IRG, CICE-FEDER-P09-CTS-4980, PeS-FEDER-PI-002, FIS-FEDER-PI11/01489 and the Howard Hughes Medical Institute (IECS-55007420). J.F.C. was supported by Core funding from the Medical Research Council and by the Wellcome Trust (grant 095518/B/11/Z). miRNAs RNA Transposition The Microprocessor controls the activity of mammalian retrotransposons