Myasthenia gravis (MG) is an organ-specific rare autoimmune disorder of neuromuscular junction where auto-antibodies are directed to the nicotinic acetylcholine receptor (nACHR), the muscle-specific tyrosine kinase (MuSK) or lipoprotein receptor-related protein 4 (LRP4) [2]. This evidence concerns the gene CHRNA4 and myasthenia gravis.