Pink1 Knockout mouse models

Mitochondrial quality control initiates with Pink1, the mouse ortholog of human PINK1, encoding a serine/threonine kinase whose N-terminal targeting sequence normally drives import, MPP and PARL cleavage, and rapid N-end rule degradation. On depolarized mitochondria import arrests, PINK1 accumulates on the TOM complex, autophosphorylates, and phosphorylates ubiquitin at Ser65 plus the parkin ubiquitin-like domain, relieving parkin autoinhibition and nucleating a feed-forward mitophagy cascade that recruits optineurin and NDP52. Recessive loss of function causes early onset Parkinson disease, while kinase-dead and targeting-sequence variants define distinct failure modes. Allele choice follows the question: conditional null for tissue-restricted mitophagy failure, kinase-dead knockin to separate scaffolding from catalysis, and humanized alleles for kinase-activator compound testing. Note that murine Pink1 nulls show respiration and striatal dopamine release deficits without frank nigral degeneration, so pair alleles with mitophagy reporters such as mito-QC or exogenous stressors when neurodegeneration is the endpoint.

Global Pink1 deletion answers broad mechanism questions quickly. If timing or site matters, conditional alleles are a natural next step after the null is characterized.