PTPRD and Intellectual disability: In particular, PTPRD has been extensively associated with a large number of brain disorders (Uhl & Martinez, 2019), including attention‐deficit hyperactivity disorder (ADHD) (Anney et al, 2008; Elia et al, 2010; Distel et al, 2011; Jarick et al, 2014), restless leg syndrome (SNP study) (Schormair et al, 2008; Yang et al, 2011; Kim et al, 2013; Moore et al, 2014), addiction (Drgonova et al, 2015; Uhl et al, 2018), bipolar disorder (Malhotra et al, 2011), obsessive–compulsive disorder (Mattheisen et al, 2015), and intellectual disability (Choucair et al, 2015).