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. |