作者: Miguel Munar-Qués , Jorge L Pedrosa , Teresa Coelho , Leonor Gusmao , Raquel Seruca
DOI: 10.1136/JMG.36.8.629
关键词: Twin study 、 Medical genetics 、 Medicine 、 Familial amyloid neuropathy 、 Monozygotic twin 、 Genetics 、 Neuromuscular disease 、 Neurofibromatosis 、 Facioscapulohumeral muscular dystrophy 、 Myotonic dystrophy
摘要: Twin studies are an important tool in medical genetics for the evaluation of relative roles genetic and non-genetic factors several diseases. Familial amyloidotic polyneuropathy type I (FAP-I), TTR Met 30, was present two sets proven monozygotic (MZ) twins, one from Majorca other Portugal. Monozygosity established by analysis DNA polymorphisms. Both pairs were discordant age at onset some clinical manifestations FAP-I. We reviewed diVerences features both presumed MZ twins with FAP-I compared them those twin Mendelian disorders, such as neurofibromatosis 1, Huntington’s disease, facioscapulohumeral muscular dystrophy, myotonic dystrophy. conclude that, addition to postulated modifying genes, there must be a significant contribution phenotypic variability (age expression), either because enviromental or stochastic events during (or after) twinning process. (J Med Genet 1999;36:629‐632)