The invention discloses an application of N4-acetylcytidine (ac4C) in preparation of a
medicine for delaying
senescence and prolonging life. The method is realized by reducing the overall ac4C modification level of
RNA (including rRNA, tRNA, mRNA, ncRNA and the like) in a
living body, and specifically can be realized by inhibiting the expression of a key catalytic adapter
protein THUMPD1 or using an inhibitor targeting THUMPD1 / ac4C. The invention also provides an application of a
reagent for detecting the aging degree or diagnosing aging-related diseases, such as Alzheimer's
disease, mitochondrial diseases, tumors and the like, in preparation of a detection kit based on the ac4C modification level of a specific target
RNA molecule, and provides a brand new target spot and strategy for aging intervention and accompanying
disease diagnosis and treatment.