Myasthenia gravis (MG) is an autoimmune disorder with fluctuating weakness in the skeletal muscles, caused by specific autoantibodies targeting the acetylcholine receptor (AChR), or less frequently against the muscle specific kinase (MuSK) or the low-density lipoprotein receptor-related protein 4 (LRP4) at the neuromuscular junction [16,17]. This evidence concerns the gene LRP4 and autoimmune disease.