TY - JOUR A1 - Berezikov, Eugene A1 - van Tetering, Geert A1 - Verheul, Mark A1 - van de Belt, Jose A1 - van Laake, Linda A1 - Vos, Joost A1 - Verloop, Robert A1 - van de Wetering, Marc A1 - Guryev, Victor A1 - Takada, Shuji A1 - van Zonneveld, Anton Jan A1 - Mano, Hiroyuki A1 - Plasterk, Ronald A1 - Cuppen, Edwin T1 - Many novel mammalian microRNA candidates identified by extensive cloning and RAKE analysis Y1 - 2006/10/01 JF - Genome Research JO - Genome Research SP - 1289 EP - 1298 DO - 10.1101/gr.5159906 VL - 16 IS - 10 UR - http://genome.cshlp.org/content/16/10/1289.abstract N2 - icroRNAs are 20- to 23-nucleotide RNA molecules that can regulate gene expression. Currently >400 microRNAs have been experimentally identified in mammalian genomes, whereas estimates go up to 1000 and beyond. Here we show that many more mammalian microRNAs exist. We discovered novel microRNA candidates using two approaches: testing of computationally predicted microRNAs by a modified microarray-based detection system, and cloning and sequencing of large numbers of small RNAs from different human and mouse tissues. Together these efforts experimentally identified 348 novel mouse and 81 novel human microRNA candidate genes. Most novel microRNAs candidates are not conserved beyond mammals, and ~10% are taxon-specific. Our analyses indicate that the entire microRNA repertoire is not remotely exhausted. ER -