Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to congenital dyserythropoietic anemia ?
    ### Response:
    CDA type I usually results from mutations in the CDAN1 gene. Little is known about the function of this gene, and it is unclear how mutations cause the characteristic features of CDA type I. Some people with this condition do not have identified mutations in the CDAN1 gene, leading researchers to believe that mutations in at least one other gene can also cause this form of the disorder.
    