TY - JOUR A1 - Numata, Koji A1 - Kanai, Akio A1 - Saito, Rintaro A1 - Kondo, Shinji A1 - Adachi, Jun A1 - Wilming, Laurens G. A1 - Hume, David A. A1 - RIKEN GER Group A1 - GSL Members A1 - Hayashizaki, Yoshihide A1 - Tomita, Masaru T1 - Identification of Putative Noncoding RNAs Among the RIKEN Mouse Full-Length cDNA Collection Y1 - 2003/06/01 JF - Genome Research JO - Genome Research SP - 1301 EP - 1306 DO - 10.1101/gr.1011603 VL - 13 IS - 6b UR - http://genome.cshlp.org/content/13/6b/1301.abstract N2 - With the sequencing and annotation of genomes and transcriptomes of several eukaryotes, the importance of noncoding RNA (ncRNA)—RNA molecules that are not translated to protein products—has become more evident. A subclass of ncRNA transcripts are encoded by highly regulated, multi-exon, transcriptional units, are processed like typical protein-coding mRNAs and are increasingly implicated in regulation of many cellular functions in eukaryotes. This study describes the identification of candidate functional ncRNAs from among the RIKEN mouse full-length cDNA collection, which contains 60,770 sequences, by using a systematic computational filtering approach. We initially searched for previously reported ncRNAs and found nine murine ncRNAs and homologs of several previously described nonmouse ncRNAs. Through our computational approach to filter artifact-free clones that lack protein coding potential, we extracted 4280 transcripts as the largest-candidate set. Many clones in the set had EST hits, potential CpG islands surrounding the transcription start sites, and homologies with the human genome. This implies that many candidates are indeed transcribed in a regulated manner. Our results demonstrate that ncRNAs are a major functional subclass of processed transcripts in mammals. ER -