COLORECTAL cancer research has identified a core transcriptional regulatory circuitry involving MYC, ETS2 and FOXP1 that controls cancer type specific super enhancer activity and supports expression of key genes.
The study reported that the master transcription factor MYC actively regulated super enhancer activity in colorectal cancer. The findings indicated that MYC operated within a broader regulatory network with ETS2 and FOXP1, forming a super enhancer dependent core transcriptional circuitry.
This regulatory module selectively promoted transcription of genes controlled by super enhancers in cooperation with the co activator BRD4. The findings therefore highlighted a hierarchical transcriptional regulatory network in colorectal cancer, with interactions between master transcription factors and distal regulatory elements contributing to cancer associated gene expression.
The researchers identified LGR5, an important stemness gene, as one target influenced by this regulatory circuitry. LGR5 was activated in colorectal cancer at least partly through a distal super enhancer controlled by the core circuitry.
The study reported that this distal super enhancer was frequently gained in colorectal cancer and was required for metastasis propagation. These findings linked super enhancer activity with the regulation of a gene associated with stemness and with processes supporting metastatic disease.
The data also showed that disrupting factors within the core regulatory circuitry sensitised colon cancer cells to BET inhibition. This finding suggested that the transcriptional dependencies created by the circuitry could influence how cancer cells responded to pharmacological disruption of BET activity.
The findings provided evidence that distal enhancer elements can act as important drivers of abnormal gene expression in colorectal cancer. In particular, the identified super enhancer was highlighted as an important contributor to LGR5 overexpression.
For healthcare professionals, the study pointed towards a potential strategy of targeting detrimental transcriptional events by focusing on regulatory circuitry rather than individual downstream genes alone. Perturbation of the MYC, ETS2 and FOXP1 network increased sensitivity to BET inhibition in the reported cancer cell models.
Overall, the findings suggested that understanding hierarchical transcriptional regulation and cancer specific super enhancer activity could help identify vulnerabilities within colorectal cancer. The work also positioned distal enhancer driven regulation of LGR5 as a potentially important mechanism underlying cancer progression and metastasis propagation.
Reference
Ye M et al. A core transcriptional regulatory circuitry controls super-enhancer-driven activation of LGR5 in colorectal cancer. Nature Communications. 2026; DOI:10.1038/s41467-026-76761-4.
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