Endogenous RNA interference and microRNA machinery (RNAi/miRNA machinery)

The endogenous RNA interference (RNAi) and microRNA (miRNA) machinery comprises a sophisticated cellular system responsible for post-transcriptional gene regulation. Key enzymatic components include Drosha and Dicer, which process precursor RNA molecules into functional small interfering RNAs (siRNAs) or miRNAs. These small RNAs are then loaded into the Argonaute proteins, particularly AGO2, which form the catalytic core of the RNA-induced silencing complex (RISC) (Meister, 2013, Nature). This machinery regulates a vast majority of human protein-coding genes, playing critical roles in cell development, differentiation, and homeostasis (Friedman et al., 2009, Genome Research). Dysregulation of these components is frequently observed in various cancers and neurodegenerative diseases, where altered miRNA profiles contribute to pathogenesis (Lin & Gregory, 2015, Nature Reviews Cancer). Modern biotechnology exploits this system through the development of siRNA-based therapeutics, such as Patisiran and Givosiran, which utilize the endogenous RISC to silence specific disease-associated genes (Adams et al., 2018, NEJM). Additionally, small molecules are being investigated to modulate these components, such as Dicer activators, to restore normal gene regulation in malignant cells. A significant challenge in targeting this machinery is the risk of off-target effects and the potential to saturate the endogenous pathway, which can interfere with vital cellular processes (Grimm et al., 2006, Nature).

Other names

RNA-induced silencing complex componentsRISC machinerymiRNA processing pathwayRNA interference pathwayRNAi machinery

RNA interference-mediated mRNA degradation and translational repression