Pink1 Conditional 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.

A floxed Pink1 allele paired with Cre gives spatial control that whole body knockouts cannot offer. People use it to separate developmental roles from adult homeostasis, to model somatic mutations, and to match disease that begins in one organ.