Myasthenia gravis (MG) is a rare autoimmune disease caused by autoantibodies against neuromuscular junction proteins; the nicotinic acetylcholine receptor (AChR), the muscle specific tyrosine kinase (MuSK) or the low-density lipoprotein receptor-related protein 4 (LRP4) [1,2]. This evidence concerns the gene MUSK and autoimmune disease.