ALDH7A1 and Alzheimer disease: Phospholipid turnover, as indicated by PME/PDE, has been reported to be higher in AD in some studies (Brown et al., 1989; Gonzalez et al., 1996; Forlenza et al., 2005), though not in others (Bottomley et al., 1992; Murphy et al., 1993; Smith et al., 1995; Rijpma et al., 2018; Das et al., 2021).