precursor microRNA (pre-miRNA)

Precursor microRNA (pre-miRNA) refers to the initial form of microRNA, which are small molecules that play a crucial role in regulating gene expression in cells. Pre-miRNAs are longer RNA sequences that are processed within the cell to produce shorter, functional microRNAs. These microRNAs bind to messenger RNA (mRNA) molecules, preventing them from being translated into proteins or marking them for degradation. This regulation helps control various biological processes, including development, cell growth, and responses to stress, making pre-miRNAs important for maintaining cellular function and overall health.