Genetic factors related to autism include TBX1 (involved in the regulation of development and associated with the 22q11.2 deletion syndrome), SHANK3 (a synaptic scaffolding gene), NLGN4 (a neuroligin gene), PCDH10 (a protocadherin gene), and NHE9 [7,8]. Here, TBX1 is linked to autism.