The microdeletions involving PTPRD have been taken up as part of a so-called “BGNADP” motif, comprising gene BTD, GALNT10, NMUR2, AUTS2, DLG2 and PTPRD, that would signify a key network determining intellectual disabilities and developmental delay (Gao et al., 2018). The gene discussed is PTPRD; the disease is Global developmental delay.