Importantly, the circadian interplay between PER2 and p53 forms a regulatory feedback loop in which p53 suppresses PER2 expression, while PER2 stabilizes p53 by inhibiting MDM2-dependent ubiquitination, linking circadian rhythm to cellular stress responses and tumor suppression (Gotoh et al., 2015; Fagiani et al., 2022). The gene discussed is PER2; the disease is neoplasm.