SLC6A6 and diabetes mellitus: This study provides evidence that type 1 diabetes patients have a significant increase (by about 30%) in TauT mRNA gene expression in MPCs, when compared with age- and sex-matched control healthy subjects, and that such expression is directly related to HbA1c, suggesting the hypothesis that diabetes, “in vivo,” may be able to chronically induce cell TauT mRNA gene expression, hypothetically as a defense measure, to improve cell homeostasis against the exposure to chronically higher glucose levels.