Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) PMM2-congenital disorder of glycosylation ?
    ### Response:
    PMM2-congenital disorder of glycosylation (PMM2-CDG, also known as congenital disorder of glycosylation type Ia) is an inherited condition that affects many parts of the body. The type and severity of problems associated with PMM2-CDG vary widely among affected individuals, sometimes even among members of the same family.
    