Park7 Knockout mouse models

Park7 encodes DJ-1, the mouse ortholog of human PARK7, a small ThiJ/PfpI-fold homodimer functioning as a redox sensor and protein deglycase that removes glycation adducts from cysteine, arginine, and lysine residues and from nucleotides, and as a holdase chaperone suppressing alpha-synuclein aggregation. Its reactive Cys106 undergoes graded oxidation to sulfinic acid, promoting mitochondrial localization, stabilization of NRF2 by antagonizing KEAP1, and modulation of PTEN and ASK1 signaling, whereas hyperoxidation to sulfonic acid inactivates the protein. Recessive PARK7 mutations such as L166P destabilize the dimer and cause early onset parkinsonism. Because global Park7 nulls remain viable with only mild nigrostriatal dopamine release deficits and no overt degeneration, allele planning should weigh conditional null against C106 redox-dead knockins, patient missense alleles, or humanization, and should anticipate additive designs with Pink1 and Prkn when dopaminergic loss rather than oxidative stress signaling is the endpoint.

Whole body loss of Park7 gives the clearest readout when the question is whether the gene is required at all. Follow up tissue work can still move to a conditional allele if lethality or compensation appears.