The function of ENSG00000111817 (DSE, dermatan sulfate epimerase) is as follows. Converts D-glucuronic acid to L-iduronic acid (IdoUA) residues. Plays an important role in the biosynthesis of the glycosaminoglycan/mucopolysaccharide dermatan sulfate. {ECO:0000269|PubMed:16505484, ECO:0000269|PubMed:19004833, ECO:0000269|PubMed:7092807, ECO:0000269|Ref.7}.