Several exome sequencing projects have identified de novo mutations in four different SWI/SNF subunits in three genetic syndromes that include CHDs: (1) Coffin-Siris syndrome (CSS); (2) Nicolaides-Baraitser syndrome (NCBRS); and (3) ARID1B-related intellectual disability (ID) syndrome [173,174,175,176,177]. This evidence concerns the gene ARID1B and Coffin-Siris syndrome.