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α-synuclein (αSyn) is the main protein component of Lewy bodies, intracellular inclusions found in the brain of Parkinson’s disease (PD) patients. Neurotoxic αSyn species are broadly modified post-translationally and, in patients with genetic forms of PD, carry genetically encoded amino acid substitutions. Mutations and C-terminal truncation can increase αSyn oligomerization and fibrillization. Although several genetic mouse models based on αSyn mutations and/or truncations exist, there is still a lack of mouse models for synucleinopathies not relying on overexpression. We report here two synucleinopathy mouse models, which are based on a triple alanine to proline mutation and a C-terminal truncation of αSyn, but do not overexpress the mutant protein when compared to the endogenous mouse protein. We knocked h αSyn  TP    or h αSyn Δ119   (h stands for “human”) into the murine  αSyn  locus. hαSyn TP  is a structure-based mutant with  t riple alanine to  p roline substitutions that favors oligomers, is neurotoxic and evokes PD-like symptoms in  Drosophila melanogaster . hαSyn Δ119  lacks 21 amino acids at the C-terminus, favors fibrillary aggregates and occurs in PD. Knocking-in of h αSyn  TP    or h αSyn Δ119   into the murine  αSyn  locus places the mutant protein under the control of the endogenous regulatory elements while simultaneously disrupting the  mαSyn  gene. Mass spectrometry revealed that h αSyn  TP    and h αSyn Δ119   mice produced 12 and 10 times less mutant protein, compared to mαSyn in wild type mice. We show phenotypes in 1 and 1.5 years old  hαSyn  TP    and  hαSyn Δ119   mice, despite the lower levels of hαSyn TP  and hαSyn Δ119  expression. Direct comparison of the two mouse models revealed many commonalities but also aspects unique to each model. Commonalities included strong immunoactive state, impaired olfaction and motor coordination deficits. Neither model showed DAergic neuronal loss. Impaired climbing abilities at 1 year of age and a deviant gait pattern at 1.5 years old were specific for  hαSyn Δ119   mice, while a compulsive behavior was exclusively detected in  hαSyn  TP    mice starting at 1 year of age. We conclude that even at very moderate levels of expression the two αSyn variants evoke measurable and progressive deficiencies in mutant mice. The two transgenic mouse models can thus be suitable to study αSyn-variant-based pathology  in vivo  and test new therapeutic approaches.

Low-Expressing Synucleinopathy Mouse Models Based on Oligomer-Forming Mutations and C-Terminal Truncation of α-Synuclein