An important subgroup of these genes is associated with the SWItch/Sucrose Non-Fermentable (SWI-SNF) complex and is called SSRIDDs for “Switch/sucrose nonfermentable related intellectual disability disorders.” Another group of ID genes cause Cornelia de Lange Syndrome (CdLS), a disorder of chromatin modification associated with the cohesin complex. Here, SMARCA1 is linked to Cornelia de Lange syndrome.