SLC7A8 and autism spectrum disorder: A recent study found nine probable pathogenic variants in 11 patients with autism spectrum disorder (ASD) including three in SLC3A2, three in SLC7A5, and three in SLC7A8. SLC3A2 encodes the heavy subunits and SLC7A5 and SLC7A8 of the light subunits of large amino acid transporters (LAT) 1 and 2.