Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to lactose intolerance ?
    ### Response:
    Lactose intolerance in infants (congenital lactase deficiency) is caused by mutations in the LCT gene. The LCT gene provides instructions for making the lactase enzyme. Mutations that cause congenital lactase deficiency are believed to interfere with the function of lactase, causing affected infants to have a severely impaired ability to digest lactose in breast milk or formula.
    