SORCS1 and attention deficit-hyperactivity disorder: Among others, SORCS1, -2 and -3 have been identified as risk genes for bipolar disorder, attention deficit hyperactivity disorder (ADHD), autism, and schizophrenia (Baum et al., 2008; Christoforou et al., 2011; Lionel et al., 2011; Alemany et al., 2015).