MicroRNA 20b (miR-20b)

MicroRNA 20b (miR-20b), encoded by the MIR20B gene, is a short non-coding RNA molecule (approximately 22 nucleotides) involved in post-transcriptional regulation of gene expression by binding to target mRNA transcripts, leading to translational inhibition or degradation[4][7][1]. miR-20b is processed from a hairpin precursor (pre-miRNA) and incorporated into the RNA-induced silencing complex (RISC). It participates in diverse biological processes including the cell cycle, proliferation, apoptosis, differentiation, migration, and angiogenesis[2][7][4]. miR-20b can function as a tumor suppressor or oncogene depending on the tissue and context: it suppresses tumor progression in colon, prostate, thyroid, and some other cancers, but acts as an oncogene in esophageal, gastric, cervical, and hepatocellular carcinoma. Experimentally, miR-20b has been shown to target PTEN, cyclin D1 (CCND1), HIF-1α, and other genes critical for tumor biology, and its dysregulation has been linked to cancer, Alzheimer’s disease, cardiovascular disease, and inflammation[1][2][4][5][7]. Currently, no drugs directly target miR-20b in clinical practice, but oligonucleotide-based therapeutics and expression modulation are areas of ongoing research[7]. The broad regulatory roles and cell-type specificity highlight both its therapeutic potential and safety concerns for future targeting strategies.

Other names

hsa-mir-20bMIR20Bhsa-mir-20b-5pmiR-20b-5pMIRN20Bmir-20b

Antisense oligonucleotides or miRNA mimics can modulate MIR20B levels, altering the repression of target mRNAs such as PTEN, cyclin D1, or HIF-1α, thus impacting processes like cell cycle, apoptosis, and invasion[2][7][5].