It has been reported that de novo mutations in kinesin family member 2a (KIF2A) represent a significant cause of lissencephaly, microcephaly, and DRE (Bahi-Buisson and Cavallin, 2016; Homma et al., 2003; Poirier et al., 2013; Guerrini and Dobyns, 2014; Tian et al., 2016; Cavallin et al., 2017; Broix et al., 2018). Here, KIF2A is linked to microcephaly.