CHD2 and autism: Since then, several mutations in the CHD2 gene have been identified and associated with developmental delay, microcephaly, autism, and epilepsy (Epi4K Consortium et al., 2013; Poot et al., 2013; Carvill et al., 2013; O'Roak et al., 2014; Deciphering Developmental Disorders Study, 2017).