Dynein axonemal assembly factor 4 (DNAAF4, also known asDYX1C1) is a dynein axonemal assembly family gene encoding a protein that contains a tetratricopeptide repeat domain.DNAAF4 dysfunction was first noted in a Finnish family in which a translocation coincidentally segregating with dyslexia was noted[3]. This evidence concerns the gene DNAAF4 and dyslexia.