Long Non-Coding RNAs in Human Disease: An Overview of Biogenesis, Molecular Mechanism and Therapeutic Opportunities

LncRNAs, defined as transcripts longer than 200 nucleotides with limited protein-coding potential, have emerged as important regulators of gene expression across multiple levels of cellular regulation. These molecules influence chromatin organization, transcriptional activity, and post-transcriptional processes through diverse interactions with DNA, RNA, and protein complexes. Although initially considered transcriptional byproducts, accumulating evidence now indicates that lncRNAs participate in a wide range of physiological processes and are implicated in numerous human diseases, including cancer, cardiovascular disorders, neurological diseases, and immune related conditions. However, the strength of mechanistic evidence varies substantially across the field, with robust functional validation currently limited to a relatively small number of well-characterized lncRNAs. In many cases, proposed regulatory roles remain supported primarily by expression correlations or limited perturbation studies, highlighting the need for careful evaluation of reproducibility, context dependence, and locus-specific effects. In addition, translating lncRNA discoveries into therapeutic strategies faces several practical challenges, including efficient tissue-specific delivery, subcellular localization constraints, isoform complexity, and potential off-target effects. This review provides an overview of current knowledge on lncRNA classification, biogenesis, and molecular mechanisms, evaluates their roles in human disease, and discusses emerging therapeutic approaches in the context of translational feasibility. By integrating mechanistic insights with current limitations and unresolved questions, we highlight priorities for future research aimed at harnessing lncRNAs for diagnostic and therapeutic applications in precision medicine.