TRAPPC9 and Intellectual disability: Patients with TRAPPC9 mutations in previous studies displayed intellectual disability, developmental delay, microcephaly, and brain abnormalities (Abbasi et al., 2017; Jamra et al., 2011; Bai & Kong, 2019; Giorgio et al., 2016; Hnoonual et al., 2019; Kakar et al., 2012; Marangi et al., 2013; Mir et al., 2009; Mochida et al., 2009; Mortreux et al., 2018; Philippe et al., 2009).