Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to essential pentosuria ?
    ### Response:
    Essential pentosuria is caused by mutations in the DCXR gene. This gene provides instructions for making a protein called dicarbonyl/L-xylulose reductase (DCXR), which plays multiple roles in the body. One of its functions is to perform a chemical reaction that converts a sugar called L-xylulose to a molecule called xylitol.
    