MicroRNA-4443 (miR-4443)

MicroRNA-4443 (miR-4443) is a primate-conserved, non-canonical small regulatory RNA that acts as a post-transcriptional regulator of gene expression. Unlike most human microRNAs, miR-4443 is produced independently of the Drosha–Exportin 5–Dicer pathway, and its biogenesis mechanism is currently unknown. Functionally, miR-4443 is implicated in multiple cancers where it can act as a tumor suppressor or contribute to drug resistance by modulating invasiveness, proliferation, and chemoresistance. It is upregulated in Graves’ disease and certain autoimmune and inflammatory contexts, where it stimulates cytokine production and CD4+ T cell proliferation via direct inhibition of TRAF4, an inhibitor of the NF-κB pathway. miR-4443 may serve as a biomarker for disease activity in cancer, autoimmune conditions, and inflammatory or neurological diseases. Despite its physiological and pathophysiological roles, the specifics of its maturation and the full extent of its regulatory network remain areas of active investigation.

Other names

hsa-mir-4443mir-4443hsa-miR-4443MIR4443

Post-transcriptional gene silencing via RNA-induced silencing complex (RISC), albeit non-canonical pathway. Modulation of target gene TRAF4, impacting the NF-κB pathway and inflammatory signaling. Downregulation of pro-metastatic targets (e.g., NCOA1, TRAF4).