Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to myasthenia gravis ?
    ### Response:
    Researchers believe that variations in particular genes may increase the risk of myasthenia gravis, but the identity of these genes is unknown. Many factors likely contribute to the risk of developing this complex disorder.  Myasthenia gravis is an autoimmune disorder, which occurs when the immune system malfunctions and attacks the body's own tissues and organs.
    