There are six key genes for developing Dyslexia, including DYX1C1, ROBO1, DCDC2, K1AA0319, SLIT1, and SRGAP1. In 1983, Smith et al. represented a new locus, DYX1 locus, linked with the reading disability, which is later discovered that the gene on that locus (DYX1C1 gene) is a genetic risk factor for developmental dyslexia [20, 23]. This evidence concerns the gene DNAAF4 and dyslexia.