αSyn	Alpha-synuclein
AD	Alzheimer’s disease
Aβ	Amyloid-β
BBB	Blood–brain barrier
BAR	Biotinylation by antibody recognition
CSF	Cerebrospinal fluid
DLB	Dementia with Lewy bodies
ER	Endoplasmic reticulum
ESM	Epidemic Spreading Model
GCIs	Glial cytoplasmic inclusions
GA	Golgi apparatus
GNIs	Glial nuclear inclusions
iLBD	Incidental Lewy body disease
iRBD	Incidental REM sleep behavior disorder
IHC	Immunohistochemistry
LBs	Lewy bodies
LNs	Lewy neurites
LLPS	Liquid–liquid phase separation
MSA	Multiple system atrophy
MAMs	Mitochondria-associated ER membranes
NAC	Non-amyloid-β component
NDM	Network Diffusion Model
NTA	N-terminally acetylated
NCIs	Neuronal cytoplasmic inclusions
NNIs	Neuronal nuclear inclusions
NSD-ISS	Neuronal αSyn disease integrated staging system
OL	Oligodendrocyte
pS129	Phosphorylation at serine 129
P-bodies	Processing bodies
PD	Parkinson’s disease
PDD	Parkinson’s disease dementia
PTM	Post-translational modification
PLA	Proximity ligation assay
PM	Plasma membrane
RT-QuIC	Real-time quaking-induced conversion
SAA	Seed amplification assay
SNARE	Soluble N-ethylmaleimide-sensitive factor attachment protein receptor
SV	Synaptic vesicle
TH	Tyrosine hydroxylase