Contrary to other studies where a haploinsufficiency of KIF1A [37], FARP2, HDLBP [10], and AGAP1 genes [13,38] was cited as a possible cause for autism in 30–35% of 2q37DS [1,3], in our patients, autistic spectrum disorder was found in just one case. This evidence concerns the gene KIF1A and autism spectrum disorder.