title: De novo TUBB2B mutation causes fetal akinesia deformation sequence with microlissencephaly: An unusual presentation of tubulinopathy.
abstract: Tubulinopathies are increasingly emerging major causes underlying complex cerebral malformations, particularly in case of microlissencephaly often associated with hypoplastic or absent corticospinal tracts. Fetal akinesia deformation sequence (FADS) refers to a clinically and genetically heterogeneous group of disorders with congenital malformations related to impaired fetal movement. We report on an early foetal case with FADS and microlissencephaly due to TUBB2B mutation. Neuropathological examination disclosed virtually absent cortical lamination, foci of neuronal overmigration into the leptomeningeal spaces, corpus callosum agenesis, cerebellar and brainstem hypoplasia and extremely severe hypoplasia of the spinal cord with no anterior and posterior horns and almost no motoneurons. At the cellular level, the p.Cys239Phe TUBB2B mutant leads to tubulin heterodimerization impairment, decreased ability to incorporate into the cytoskeleton, microtubule dynamics alteration, with an accelerated rate of depolymerization. To our knowledge, this is the first case of microlissencephaly to be reported presenting with a so severe and early form of FADS, highlighting the importance of tubulin mutation screening in the context of FADS with microlissencephaly.
authors.affiliation: Pathology Laboratory, Rouen University Hospital, France; Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research Innovation in Biomedecine, Normandy University, Rouen, France.
authors.forename: Annie
authors.initials: A
authors.lastname: Laquerriere
authors.affiliation: Department of Medical Genetics, Armand Trousseau Hospital, APHP, Paris, France; Sorbonne Universities, UPMC, Paris, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Gonzales
authors.affiliation: Inserm, U1016, Institut Cochin, Paris, France; CNRS, UMR8104, Paris, France; Paris Descartes - Sorbonne Paris Cité University, Imagine Institute, Paris, France.
authors.forename: Yoann
authors.initials: Y
authors.lastname: Saillour
authors.affiliation: Paris Descartes - Sorbonne Paris Cité University, Imagine Institute, Paris, France; Pediatric Neurology, Necker Enfants Malades University Hospital, Paris, France; INSERM UMR-1163, Embryology and Genetics of Congenital Malformation Université Paris Descartes-Sorbonne Paris Cité, Institut Imagine, Université Paris Descartes-Sorbonne Paris Cité, France.
authors.forename: Mara
authors.initials: M
authors.lastname: Cavallin
authors.affiliation: Department of Medical Genetics, Armand Trousseau Hospital, APHP, Paris, France; Sorbonne Universities, UPMC, Paris, France.
authors.forename: Nicole
authors.initials: N
authors.lastname: Joyē
authors.affiliation: Department of Clinical Genetics, South University Hospital, Rennes, France.
authors.forename: Chloé
authors.initials: C
authors.lastname: Quēlin
authors.affiliation: Department of Prenatal Diagnosis, Department of Obstetrics and Gynecology, René Dubos Hospital, Pontoise, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Bidat
authors.affiliation: Sorbonne Universities, UPMC, Paris, France; Department of Obstetrics and Gynecology, Groupe Hospitalier Pitié Salpêtrière, APHP, Paris, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Dommergues
authors.affiliation: Department of Genetics, Clinical Genetics, Caen University Hospital, Caen, France.
authors.forename: Ghislaine
authors.initials: G
authors.lastname: Plessis
authors.affiliation: Paris Descartes - Sorbonne Paris Cité University, Imagine Institute, Paris, France; Pediatric Neurology, Necker Enfants Malades University Hospital, Paris, France; Département de Génétique, Necker-Enfants Malades University Hospital, Paris, France.
authors.forename: Ferechte
authors.initials: F
authors.lastname: Encha-Razavi
authors.affiliation: Pôle de biologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France; Institut de Génétique et Biologie Moléculaire et Cellulaire - IGBMC, INSERM, CNRS, Université de Strasbourg, Strasbourg, France.
authors.forename: Jamel
authors.initials: J
authors.lastname: Chelly
authors.affiliation: Paris Descartes - Sorbonne Paris Cité University, Imagine Institute, Paris, France; Pediatric Neurology, Necker Enfants Malades University Hospital, Paris, France; INSERM UMR-1163, Embryology and Genetics of Congenital Malformation Université Paris Descartes-Sorbonne Paris Cité, Institut Imagine, Université Paris Descartes-Sorbonne Paris Cité, France. Electronic address: nadia.bahi-buisson@nck.aphp.fr.
authors.forename: Nadia
authors.initials: N
authors.lastname: Bahi-Buisson
authors.affiliation: Inserm, U1016, Institut Cochin, Paris, France; CNRS, UMR8104, Paris, France; Paris Descartes - Sorbonne Paris Cité University, Imagine Institute, Paris, France.
authors.forename: Karine
authors.initials: K
authors.lastname: Poirier
mesh_terms: D000328:Adult; D001176:Arthrogryposis / Q000235:genetics* / Q000503:physiopathology; D002531:Cerebellum / Q000503:physiopathology; D005260:Female; D005333:Fetus; D006801:Humans; D054220:Malformations of Cortical Development / Q000235:genetics* / Q000503:physiopathology; D008831:Microcephaly / Q000235:genetics* / Q000503:physiopathology; D009046:Motor Neurons / Q000473:pathology; D009154:Mutation; D013116:Spinal Cord / Q000503:physiopathology; D014404:Tubulin / Q000172:deficiency / Q000235:genetics*
chemical_list: C576987:TUBB2B protein, human; D014404:Tubulin
keywords: Fetal akinesia deformation sequence; Microcephaly; Microlissencephaly; Migration disorder; TUBB2B