SLC1A2 and autism: The SLC1A2 promoter region was also hypermethylated (~300%, Mean ± SEM 1 ± 0.4 and 3.3 ± 0.7 in controls and autism, respectively, p = 0.02) in the brains of patients with autism (Figure 2M), though its overall promoter DNA methylation was trivial (~5% in controls and 15% in autism).