FAT3 and speech disorder: The duplication region 11q14.3-q21 encompassing MNTR1B and FAT3 co-occurred with duplication Xq27.3 encompassing the SOX3 gene, which was previously linked to the etiology of ID, hypopituitarism, and speech disorders, but not ASD (Solomon, 2004; Stankiewicz et al., 2005).