Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to hypomyelination and congenital cataract ?
    ### Response:
    Mutations in the FAM126A gene cause hypomyelination and congenital cataract. The FAM126A gene provides instructions for making a protein called hyccin, the function of which is not completely understood. Based on the features of hypomyelination and congenital cataract, researchers presume that hyccin is involved in the formation of myelin throughout the nervous system.
    