MAD1L1 and attention deficit-hyperactivity disorder: Notably, MAD1L1 has previously been associated with ADHD, as reported in an EWAS of DNAm data measured in saliva samples on the Illumina 450K HumanMethylation array [42]; Wilmot et al. found four CpGs mapping to MAD1L1 associated with ADHD at a nominal p value< 0.05 and Δβ > 2% [42].