p53-responsive DNA element (p53RE)

p53-responsive DNA elements (p53REs) are specific genomic sequences that serve as the primary binding sites for the p53 tumor suppressor protein, a master regulator of the cellular stress response. These elements typically consist of two decameric half-sites with the consensus sequence RRRCWWGYYY (where R is a purine, Y is a pyrimidine, and W is A or T), separated by a short spacer of 0 to 13 base pairs (Riley et al., 2008, Nature Reviews Molecular Cell Biology). Upon activation by DNA damage, hypoxia, or oncogenic stress, p53 binds to these elements to transcriptionally activate or repress a vast network of genes involved in cell cycle arrest, DNA repair, and programmed cell death (Kastenhuber & Lowe, 2017, Cell). In many human cancers, the interaction between p53 and its response elements is disrupted by mutations in the p53 DNA-binding domain or by the overexpression of negative regulators like MDM2 (Donehower et al., 2019, Cell Reports). Therapeutic strategies targeting this axis focus on restoring the sequence-specific binding of p53 to its response elements, thereby reactivating the endogenous tumor-suppressive program. Small molecules such as MDM2 inhibitors (e.g., Nutlins) prevent p53 degradation, while compounds like APR-246 aim to refold mutant p53 into a conformation capable of recognizing these DNA sequences (Bykov et al., 2018, Nature Reviews Cancer). Consequently, p53REs are central to the efficacy of a wide range of oncology treatments that rely on the induction of p53-dependent gene expression.

Other names

p53 response elementp53 binding sitep53-binding DNA sequencep53-responsive element

Restoration or enhancement of p53 protein binding to genomic response elements to trigger the transcription of tumor-suppressive genes.