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MIR181A1: MIR181A1 is a gene located on chromosome 1q32.1 [PMC4342183]. Previous findings and current data suggest a new mechanism of action for the ETV6/RUNX1 fusion gene, in which it binds to the regulatory region of MIR181A1, resulting in low expression of hsa-mir-181a-1 [PMC4651427]. This binding reduces the miR-181a-mediated translational repression of ETV6/RUNX1. An intergenic SNP, rs427790, located between MIR181A1 and NR5A2, is an expression quantitative trait locus (eQTL) hit in the testis and basal ganglia [PMC6071032]. Blocking MSK1 activation or knockdown also reduces STAT3 recruitment at the MIR181A1 promoter [PMC4666837]. Analysis identified a 10-gene set of downregulated genes predicted to be bound by MIR181A1 or miR181b1, including NEXMIF, DEK, DTX4, FBXO33, MEAF6, MED8, MFSD6, PLEKHJ1, RBBP7 and SCOC [PMC7108928]. Overexpression of both MIR181A1 and miR181b enhanced growth in 3D cultures compared to single miRNA overexpression [PMC7108928]. Additionally, MIR181A1 amplification was found in approximately 12% of breast cancer samples [PMC4666837]. The expression of both members of the Mir181ab cluster (MIR181A1 and Mir18b) is necessary for inducing an oncogenic phenotype in KRAS-mutated tumors [PMC7108928].
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