The function of Ensembl gene identifier ENSG00000138413 (IDH1, isocitrate dehydrogenase (NADP(+)) 1) is as follows. Catalyzes the NADP(+)-dependent oxidative decarboxylation of isocitrate (D-threo-isocitrate) to 2-ketoglutarate (2-oxoglutarate), which is required by other enzymes such as the phytanoyl-CoA dioxygenase (PubMed:10521434, PubMed:19935646). Plays a critical role in the generation of NADPH, an important cofactor in many biosynthesis pathways (PubMed:10521434). May act as a corneal epithelial crystallin and may be involved in maintaining corneal epithelial transparency (By similarity). {ECO:0000250|UniProtKB:Q9XSG3, ECO:0000269|PubMed:10521434, ECO:0000269|PubMed:19935646, ECO:0000303|PubMed:10521434}.