Non-coding RNAs make up the majority (98%) of the transcriptome, and understanding the significance of this type of RNA can help us better understand nature and its application in our daily life. Several different classes of regulatory RNAs with important functions have been discovered including small RNAs such as microRNAs and long noncoding RNAs (lncRNAs). Classification of lncRNAs based on the sizes. Long noncoding RNAs (lncRNAs) have gained widespread attention in recent years as a potentially new and crucial layer of biological regulation. For example, X-inactive specific transcript (Xist) regulates allelic expression by X chromosome inactivation.
From the C-value enigma and junk DNA to Discovery of IncRNAs