Canonical and isomiR products of miR-142 enhance dendritic cell reprogramming.

miR-142 and miR-124 isoforms significantly improve dendritic cell reprogramming efficiency and fidelity, with miR-142 enhancing anti-tumor immunity in vivo.

• Why it matters: Understanding how miRNAs and their isoforms influence cellular reprogramming can unlock new strategies for immune cell engineering and cancer immunotherapy, addressing gaps in knowledge about their specific roles.
• What they did: Researchers analyzed miRNAs and isomiRs during direct reprogramming to cDC1s, focusing on miR-124 and miR-142, and developed RNA-based methods combining transcription factor mRNAs with miRNA mimics to enhance reprogramming.
• The result: Findings reveal that miRNA isoform diversity acts as a programmable regulatory layer in immune cell specification, enabling non-viral reprogramming approaches that boost anti-tumor immune responses.