UBC and neurodegenerative disease: Neurodegenerative diseases, such as Alzheimer’s disease (AD), Parkinson’s disease (PD), amyotrophic lateral sclerosis (ALS), frontotemporal dementia (FTD), Huntington’s disease (HD), and prion diseases, are fatal diseases caused by the progressive loss of structure and function of neurons in the central or peripheral nervous system, and accompanied by protein aggregation and ubiquitin-positive inclusion body formation (Dugger and Dickson 2017; Boland et al., 2018).