CYP19A1 and dyslexia: In this regard, the discovery of single-nucleotide polymorphisms within CYP19A1 associated with dyslexia categorical traits and with phonological phenotypes is of high relevance.73 Interestingly, cyp19A1 is associated with the control of vocalization in songbirds and teleost fish74,75 and CYP19A1 expression in the human brain correlates with the expression of other dyslexia-associated genes, such as ROBO1 and DYX1C1.