BRD4 and Intellectual disability: Heterozygous, multigenic deletions in chromosome 19, encompassing BRD4, have been linked to intellectual disability in multiple probands (Jensen et al., 2009; Bonaglia et al., 2010; van der Aa et al., 2010; Gallant et al., 2011; Jelsig et al., 2012; Olley et al., 2018; Alesi et al., 2019).