MicroRNA-128 precursor (pre-miR-128)

MicroRNA-128 (miR-128) is a highly conserved, brain-enriched microRNA that serves as a master regulator of neuronal differentiation, maturation, and synaptic excitability (Smirnova et al., 2005, PubMed: 15805169). It is processed from two distinct genomic precursors, miR-128-1 and miR-128-2, which are located on chromosomes 2 and 3 respectively, but produce an identical mature sequence (miRBase). In the central nervous system, miR-128 maintains homeostatic balance by targeting signaling pathways and ion channels that govern neuronal firing; its loss is frequently associated with hyperexcitability and epilepsy (Tan et al., 2013, PubMed: 23748440). Beyond its neurological roles, miR-128 acts as a potent tumor suppressor in various malignancies, most notably glioblastoma multiforme, where it inhibits the expression of oncogenes like BMI1 and E2F3 to restrict cell proliferation and self-renewal (Godlewski et al., 2008, PubMed: 18617621). Therapeutic strategies targeting miR-128 include the use of synthetic mimics to restore its levels in cancer or antisense oligonucleotides (antagomirs) to reduce its activity in neurodegenerative contexts. Current research also highlights its involvement in metabolic regulation, specifically cholesterol homeostasis, making it a versatile target for multi-disease intervention (Adlakha et al., 2013, PubMed: 23836898).

Other names

MIR128MIR128-1MIR128-2hsa-mir-128-1hsa-mir-128-2MicroRNA 128

miR-128 mimics restore post-transcriptional repression of target mRNAs by binding to their 3' untranslated regions (UTRs), while antagomirs competitively inhibit the mature miRNA to prevent gene silencing of target transcripts (Adlakha & Saini, 2014, PubMed: 24713259).