TCF7L2 and type 2 diabetes mellitus: In the multisite SEARCH for diabetes in youth study, variants in TCF7L2 (rs12255372 and rs7903146) were genotyped in African American (n = 154) and non-Hispanic White (n = 86) children and adolescents who presented clinically with antibody-negative, monogenic DM-negative T2D between the ages of 10 and 22, as well as a population-based group of race/ethnicity-matched controls (n = 391 and n = 608, resp).