Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to Dandy-Walker malformation ?
    ### Response:
    Researchers have found mutations in a few genes that are thought to cause Dandy-Walker malformation, but these mutations account for only a small number of cases. Dandy-Walker malformation has also been associated with many chromosomal abnormalities. This condition can be a feature of some conditions in which there is an extra copy of one chromosome in each cell (trisomy).
    