CNDP1 and type 2 diabetes mellitus: Prompted by the finding that the carnosinase 1 gene (CNDP1) is a susceptibility locus for developing diabetic kidney disease (DKD) in patients with type 2 diabetes, various studies have reported possible mechanisms by which carnosine may convey protection against DKD (Liu et al. 2020; Zhu et al. 2021; Boldyrev et al. 2013).