CYP2D6 and Cognitive impairment: In addition, an associationof the genes, previously demonstrated to be involved in thedevelopment of mental disorders (MEF2C, EXOC4, CYP2D6,FAM109B, SEPT3, NAGA, TCF20, NDUFA6), was determinedwith cognitive functioning in mentally healthy individuals.In the study of genes associated with cognitive impairment,the role of genes involved in epigenetic regulation (includingDNA methylation, histone modification, and chromatinremodeling) was established.