Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Abetalipoproteinemia ?
    ### Response:
    What causes abetalipoproteinemia? Abetalipoproteinemia is caused by changes (mutations) in the MTTP gene. The MTTP gene gives the body instructions to make a protein needed for creating beta-lipoproteins. These lipoproteins are necessary for the body to absorb fats, cholesterol, and fat-soluble vitamins (vitamins A, D, E and K), and for transporting these substances in the blood.
    