Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Alpha-1 Antitrypsin Deficiency ?
    ### Response:
    Alpha-1 antitrypsin (AAT) deficiency is an inherited disease. "Inherited" means it's passed from parents to children through genes.
                
Children who have AAT deficiency inherit two faulty AAT genes, one from each parent. These genes tell cells in the body how to make AAT proteins.
    