Abstract: The present disclosure relates to the field of biomedicine, in particular to the use of MCM8-cGAS-STING-IFN-I signal pathway as a disease target, including the use in the preparation of an animal model of a disease or the preparation of a product for the diagnosis, prevention, or treatment of a disease. In particular, the present disclosure comprises the use of a reagent for quantitatively detecting the gene expression or protein expression or protein activity of MCM8 in the preparation of a product for the diagnosis of a disease caused by dysfunctional mitophagy or caused by abnormal activation of cGAS-STING-IFN-I signaling pathway.