SLC3A1 and cystinuria: Cystinuria, a rare aminoaciduria condition (OMIM#220100 or OMIM#600918) with an estimated prevalence of 1:7000 newborns is caused by mutations in either SLC3A1 or SLC7A9 genes, which encode rBAT and b0,+ AT, respectively; the two subunits of the cystine and dibasic b0,+ amino acid transporter of renal and intestinal epithelial cells.