TUBB2B and polymicrogyria: Known collectively as the ‘tubulinopathies’, this disease spectrum encompasses numerous neurodevelopmental disorders including, microcephaly, lissencephaly, and polymicrogyria, reflecting the large number of tubulin genes expressed during embryonic brain formation (e.g., TUBA1A, TUBB2A, TUBB2B, TUBB3, TUBB5) (Keays et al., 2007; Jaglin et al., 2009; Poirier et al., 2010; Breuss et al., 2012; Cushion et al., 2014; Romaniello et al., 2018).