Hairy and enhancer of split 6 mRNA (HES6 mRNA)

Hairy and enhancer of split 6 (HES6) is a member of the basic helix-loop-helix (bHLH) family of transcription factors that plays a unique role in the Notch signaling pathway. Unlike other HES family members that typically act as transcriptional repressors to maintain stemness, HES6 often functions as a pro-differentiation factor by antagonizing HES1 activity and promoting neurogenesis (UniProt, O14464). In the context of oncology, HES6 is frequently overexpressed and acts as a potent oncogenic driver, particularly in prostate and breast cancers (Hartman et al., 2009, PMID: 19176382). In castration-resistant prostate cancer (CRPC), HES6 is identified as a master regulator that enhances androgen receptor (AR) signaling and promotes an aggressive, metastatic phenotype (Ramos-Montoya et al., 2014, PMID: 24703801). Because the HES6 protein lacks a traditional ligand-binding pocket for small molecules, the mRNA itself has become a primary therapeutic target. Experimental strategies using antisense oligonucleotides (ASOs) and small interfering RNAs (siRNAs) aim to silence HES6 mRNA to reduce tumor growth and restore sensitivity to standard therapies. While no HES6-targeted drugs are currently FDA-approved, the mRNA remains a high-priority target for precision RNA-based therapeutics in advanced malignancies.

Other names

HES-6bHLHb41C-terminal polyhistidine repeat proteinCPHRPHairy and enhancer of split 6 (Drosophila) mRNAClass B basic helix-loop-helix protein 41

Degradation of HES6 mRNA through RNase H-mediated cleavage (by antisense oligonucleotides) or the RNA-induced silencing complex (RISC) pathway (by siRNA) to prevent the translation of the HES6 protein, thereby inhibiting its oncogenic activity.