title: Neuronal migration disorders in microcephalic osteodysplastic primordial dwarfism type I/III.
abstract: Microcephalic osteodysplastic primordial dwarfism (MOPD) is a rare microlissencephaly syndrome, with at least two distinct phenotypic and genetic types. MOPD type II is caused by pericentrin mutations, while types I and III appear to represent a distinct entity (MOPD I/III) with variably penetrant phenotypes and unknown genetic basis. The neuropathology of MOPD I/III is little understood, especially in comparison to other forms of lissencephaly. Here, we report postmortem brain findings in an 11-month-old female infant with MOPD I/III. The cerebral cortex was diffusely pachygyric, with a right parietal porencephalic lesion. Histologically, the cortex was abnormally thick and disorganized. Distinct malformations were observed in different cerebral lobes, as characterized using layer-specific neuronal markers. Frontal cortex was severely disorganized and coated with extensive leptomeningeal glioneuronal heterotopia. Temporal cortex had a relatively normal 6-layered pattern, despite cortical thickening. Occipital cortex was variably affected. The corpus callosum was extremely hypoplastic. Brainstem and cerebellar malformations were also present, as well as old necrotic foci. Findings in this case suggest that the cortical malformation in MOPD I/III is distinct from other forms of pachygyria-lissencephaly.
authors.affiliation: Department of Neurosurgery, University of Washington, Center for Integrative Brain Research, Seattle Children's Hospital, Box C9S-10, 1900 Ninth Ave, Seattle, WA 98101, USA.
authors.forename: Gordana
authors.initials: G
authors.lastname: Juric-Sekhar
authors.forename: Raj P
authors.initials: RP
authors.lastname: Kapur
authors.forename: Ian A
authors.initials: IA
authors.lastname: Glass
authors.forename: Mitzi L
authors.initials: ML
authors.lastname: Murray
authors.forename: Shawn E
authors.initials: SE
authors.lastname: Parnell
authors.forename: Robert F
authors.initials: RF
authors.lastname: Hevner
mesh_terms: D001921:Brain / Q000378:metabolism / Q000473:pathology*; D064032:Calbindin 2; D064026:Calbindins; D004392:Dwarfism / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics / Q000473:pathology; D005260:Female; D005317:Fetal Growth Retardation / Q000000981:diagnostic imaging / Q000235:genetics / Q000473:pathology; D005820:Genetic Testing / Q000379:methods; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D006801:Humans; D007223:Infant; D054081:Malformations of Cortical Development, Group II / Q000209:etiology* / Q000235:genetics / Q000473:pathology / Q000532:radiotherapy; D008831:Microcephaly / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics / Q000473:pathology; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D016900:Neurofilament Proteins / Q000378:metabolism; D009460:Neurologic Examination; D010009:Osteochondrodysplasias / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics / Q000473:pathology; D011859:Radiography; D064030:S100 Calcium Binding Protein G / Q000378:metabolism
chemical_list: D064032:Calbindin 2; D064026:Calbindins; D005904:Glial Fibrillary Acidic Protein; D008869:Microtubule-Associated Proteins; D016900:Neurofilament Proteins; D064030:S100 Calcium Binding Protein G; C085284:microtubule-associated protein 1B; C051774:neurofilament protein H