CCNA1 and attention deficit-hyperactivity disorder: ADHD gene expression heatmap based on GTEX v7 RNA-seq data for 48 genes (18 PASCAL associated genes plus 30 interactor genes) has revealed higher relative expression levels across several brain tissues for the following genes: ELOVL2, CCNA1, FEZF1, FEZF1-AS1, CDH8 and SORCS3. Conversely, the vast majority of the remaining genes, including those associated on chromosome 1, have shown relative lower expression levels in brain tissues from GTEX (Fig. 5).