Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to dyskeratosis congenita ?
    ### Response:
    In about half of people with dyskeratosis congenita, the disorder is caused by mutations in the TERT, TERC, DKC1, or TINF2 gene. These genes provide instructions for making proteins that help maintain structures known as telomeres, which are found at the ends of chromosomes.
    