DLGAP1 and attention deficit-hyperactivity disorder: As DLGAP1 encoding protein SAPAP interacted with PSD95 encoded by DLG4, that constituted NMDA receptor‐associated postsynaptic density proteins, DLG4 was reported to be a predictor of cognitive deficits (Sultana et al., 2009; Whitfield et al., 2014), while NMDA was suggested for the association with ADHD and prefrontal dysfunction, we tested the association of DLGAP1‐DLG4‐NMDA pathway with cognitive flexibility and ADHD symptom.