BAIAP2 and autism spectrum disorder: IRSp53 directly interacts with PSD-95 and Shank, excitatory postsynaptic scaffolding proteins known to regulate synapse assembly and function and implicated in various brain disorders, including autism spectrum disorders (ASD; Sheng and Sala, 2001; Sheng and Hoogenraad, 2007; Jiang and Ehlers, 2013; Sala et al., 2015; Monteiro and Feng, 2017).