Prkaa2 Conditional Knockout mouse models

Skeletal muscle, liver and the nuclear compartment rely disproportionately on AMPK alpha2, the catalytic subunit encoded by Prkaa2 and orthologous to human PRKAA2, which shares the Thr172 activation loop and LKB1 and CaMKK2 inputs with alpha1 but carries a nuclear localization signal and a distinct autoinhibitory region that tune its response to contraction and fasting. Constitutive nulls are viable yet glucose intolerant with reduced exercise-stimulated glucose uptake and blunted AICAR responses, evidence that alpha1 covers part but not all of the requirement. Design accordingly: muscle or hepatocyte conditional nulls isolate tissue-autonomous metabolic control, a dominant-negative K45R allele interrogates acute pathway suppression, and truncated constitutively active knockins test sufficiency for mitochondrial biogenesis. Because alpha1 and alpha2 heterotrimers differ mainly in subcellular distribution rather than substrate preference, quantify residual Thr172 and ACC phosphorylation before assigning any phenotype to Prkaa2 alone.

A floxed Prkaa2 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.