Noncoding RNAs.

There has been substantial progress in studies on non-protein-coding RNAs (ncRNAs) during the last decade. Due to the development of new experimental approaches, a wide variety of such molecules have been found. This review considers the major groups of eukaryotic ncRNAs successfully studied in recent years. In particular, snoRNAs and scaRNAs involved in RNA modification and also miRNAs, siRNAs, tasiRNAs, and piRNAs responsible for RNA silencing are discussed. The transcripts of SINEs and SINE-like genes are considered separately.