title: [Biological etiologies of transsexualism].
abstract: Transsexualism or gender dysphoria is a disorder of sexual identity of unknown etiology. At the biological level, one assumes atypical brain development during certain periods of its formation (genesis) notably during embryogenesis, as a result of altered hormonal influence and a particular genetic polymorphism. This article summarizes the research conducted to date in these three areas only, excluding psycho-social and environmental factors.
authors.forename: Anne-Virginie
authors.initials: AV
authors.lastname: Butty
authors.forename: Francesco
authors.initials: F
authors.lastname: Bianchi-Demicheli
mesh_terms: D001921:Brain / Q000196:embryology / Q000254:growth & development; D005260:Female; D000068116:Gender Dysphoria / Q000209:etiology*; D005783:Gender Identity; D006728:Hormones / Q000502:physiology; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D014189:Transsexualism / Q000209:etiology*
chemical_list: D006728:Hormones