title: The spectrum of type III lissencephaly: a clinicopathological update.
abstract: A third type of lissencephaly that does not fufil diagnostic criteria of type I ("classical") and type II ("cobblestone") lissencephaly was described by our group as a new entity identified as OMIM 601160. This lethal familial syndrome comprises micrencephaly/lissencephaly and a spectrum of abnormalities lined to a severe fetal akinesia deformation sequence. Neuropathological findings suggest severe neurodegeneration leading to a marked neuronal dropout of the entire central nervous system and atrophy. Similar neuropathological findings have been described in the Neu-Laxova syndrome (NLS), an apparently different lethal malformation syndrome. Neuropathological similarities between OMIM 601160 and NLS raise the question of clinicopathological variability and genetic heterogeneity of type III lissencephaly. To answer this question, we compared our clinicopathological findings in a series of fetuses with OMIM 601160 to pathological data reported in NLS. In the study, 5 unrelated families with 7 affected fetuses were included. Interestingly, we found striking clinicopathological similarities between OMIM 601160 and NLS, which may represent a variability of a single neurodegenerative disease with early prenatal onset. Molecular studies in multiplex families defined through detailed clinicopathological screening are needed to clarify the distinction, if any, between these two entities.
authors.affiliation: Service d'Anatomie et Cytologie Pathologiques, Hôpital de la Croix-Rousse, 103 Grande rue de la Croix-Rousse, 69317 Lyon 04, France. fabienne.allias@chu-lyon.fr
authors.forename: Fabienne
authors.initials: F
authors.lastname: Allias
authors.forename: Annie
authors.initials: A
authors.lastname: Buenerd
authors.forename: Raymonde
authors.initials: R
authors.lastname: Bouvier
authors.forename: Jocelyne
authors.initials: J
authors.lastname: Attia-Sobol
authors.forename: Frédérique
authors.initials: F
authors.lastname: Dijoud
authors.forename: Alixe
authors.initials: A
authors.lastname: Clémenson
authors.forename: Férechté
authors.initials: F
authors.lastname: Encha-Razavi
mesh_terms: D000015:Abnormalities, Multiple / Q000175:diagnosis*; D000328:Adult; D017209:Apoptosis; D001176:Arthrogryposis / Q000150:complications; D001921:Brain / Q000002:abnormalities* / Q000196:embryology; D019465:Craniofacial Abnormalities; D005260:Female; D005317:Fetal Growth Retardation; D005865:Gestational Age; D006801:Humans; D007621:Karyotyping; D008264:Macrophages; D008297:Male; D009421:Nervous System Malformations / Q000175:diagnosis* / Q000473:pathology; D019636:Neurodegenerative Diseases; D009474:Neurons / Q000378:metabolism; D010641:Phenotype; D006831:Polyhydramnios; D011247:Pregnancy; D012189:Retrospective Studies; D013577:Syndrome; D013997:Time Factors; D016216:Ultrasonography, Prenatal; D014965:X-Rays