MicroRNA 642b (MIR642B)

MicroRNA 642b is a small, non-coding RNA molecule encoded by the MIR642B gene. Like other microRNAs, it functions in post-transcriptional gene regulation, primarily by binding to complementary sequences in target mRNAs and leading to their translational inhibition or degradation. MIR642B is predominantly researched as an oncogenic microRNA (oncomiR) that is upregulated in several cancer types, notably promoting tumor development and progression in gastric and breast cancer. Its pathological effects are mediated through the repression of tumor suppressor genes such as CSMD1 and modulation of the Smad signaling pathway, impacting cell proliferation, migration, invasion, and epithelial–mesenchymal transition. MIR642B and its isoforms represent candidate biomarkers for cancer classification and prognosis, though direct interacting drugs and approved clinical targeting strategies are not yet established.

Other names

MIR642Bhsa-mir-642bmir-642bMIR642B RNANCBI Gene: 100500845Ensembl: ENSG00000283212miRBase: hsa-mir-642b

Drugs targeting MIR642B or similar microRNAs typically act by antagonizing its oncogenic function (e.g., anti-miR therapies to inhibit overactive miRNAs) or by restoring/mimicking tumor-suppressor miRNAs (miRNA mimics). The mechanism involves gene silencing at the mRNA level (translational repression and/or mRNA destabilization).