Telomerase reverse transcriptase gene promoter (TERT promoter)

The Telomerase reverse transcriptase (TERT) gene promoter is a critical DNA regulatory element that governs the expression of the TERT protein, the rate-limiting catalytic subunit of the telomerase enzyme (Heidenreich & Kumar, 2017, Nature Reviews Cancer). While transcriptionally silenced in most adult somatic cells to limit proliferative potential, the TERT promoter is frequently reactivated in approximately 90% of human cancers. This reactivation is often driven by highly recurrent somatic mutations, specifically C228T and C250T, which create de novo binding sites for ETS transcription factors like GABP, leading to TERT overexpression (Huang et al., 2013, Science; Bell et al., 2015, Science). By maintaining telomere length, this reactivation allows tumor cells to bypass replicative senescence and achieve immortality. Therapeutic strategies targeting the TERT promoter focus on stabilizing G-quadruplex (G4) structures—non-canonical DNA folds within the G-rich promoter sequence—that naturally act as transcriptional repressors (Song et al., 2019, Scientific Reports). Small molecules like Pidnarulex (CX-5461) are being investigated for their ability to stabilize these structures and silence TERT expression in a tumor-specific manner (Xu et al., 2017, Nature Communications). Because TERT expression is a near-universal hallmark of cancer with limited presence in healthy tissues, the TERT promoter represents a high-priority target for selective oncology drug development.

Other names

hTERT promoterTERTpTelomerase reverse transcriptase promoter regionTERT gene promoter DNA

Stabilization of G-quadruplex (G4) structures within the promoter region to physically inhibit the recruitment of the transcriptional machinery and suppress TERT mRNA synthesis; disruption of ETS transcription factor binding to mutant promoter sequences.