“…HO-1 has been a subject of key reviews and editorials, with several focusing on its importance in the kidney. 1,[3][4][5] In this issue of the Journal of the American Society of Nephrology, Leaf et al 6 highlight the importance of an association between genetic polymorphisms in the HO-1 promoter and the risk for developing AKI after major cardiac surgery. The polymorphism pertains to variations in length in a GTrepeat region in the proximal promoter of the human HO-1 gene, which typically ranges between 12 and 40.…”