Updated project metadata. Human non-mutated 0N4R Tau and P301L mutant 0N4R Tau tagged at the N-terminus with eGFP were expressed in mouse (CD1) primary cortical neurons using adeno associated viruses to monitor early changes in the synaptic interactome beforethe onset of neuronal loss. Affinity purification mass spectrometry (AP-MS) combined with tandem mass tagging was used to quantitatively compate the non-mutated and P301L interactomes.