P4HA1 and Parkinson disease: The regulatory pathways from PD genetic markers are moreprominent for the enzymes ALDH2, BCAT1, AL1B1, andP5CR1, while pathways to BCAT2 and P4HA1 originate morefrom the genetic markers shared between PD and VP (Fig. 4).Among the enzymes of acylcarnitine metabolism, fatty acidsynthase (FAS) is subject to the most significant regulatoryinfluence (Fig. 5).