When the MECP2 gene does not function properly, as in those having Rett syndrome, insufficient amounts or structurally abnormal forms of the protein are formed. The absence or malfunction of the protein likely causes other genes to be abnormally expressed. | When the MECP2 gene does not function properly, as in those having Rett syndrome, insufficient amounts or structurally abnormal forms of the protein are formed. The absence or malfunction of the protein likely causes other genes to be abnormally expressed. |