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The syndrome of megalencephaly, mega corpus callosum (MEG-MegaCC) accompanied by complete lack of motor development is a rare condition with only few sporadic cases having been reported in the literature. In this paper, we describe a child from non-consanguineous parents presenting with MegaCC, psychomotor retardation, and language impairment linked to MEG-MegaCC syndrome. Genetic analysis, radiological findings, and detailed neurological phenotype of MEG-MegaCC syndrome with its overlapping syndromes would allow for a better classification of the disease spectrum.
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http://dx.doi.org/10.1007/s00381-023-06150-5 | DOI Listing |
HGG Adv
August 2025
Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD 57104, USA; Sanford School of Medicine, University of South Dakota, Sioux Falls, SD 57105, USA. Electronic address:
The increasing availability and affordability of genetic testing has resulted in the identification of numerous novel variants associated with neurodevelopmental disorders. There remains a need for methods to analyze the functional impact of these variants. Some methods, like expressing these variants in cell culture, may be rapid, but they lack physiologic context.
View Article and Find Full Text PDFMol Genet Genomic Med
August 2025
Maternal-Fetal Medicine Center, Shenzhen Maternity and Child Healthcare Hospital, Women and Children's Medical Center, Southern Medical University, Shenzhen, China.
Objectives: To investigate the abnormal development of cerebral cortical sulci and gyri in fetuses with Overgrowth Syndrome and/or Cerebral Malformations Due to mTOR Pathway Gene Abnormalities (OCMMPG), focusing on prenatal imaging correlates of mTOR dysregulation.
Methods: Retrospective analysis of three OCMMPG cases diagnosed via whole-exome sequencing (WES). Sulco-gyral morphology was assessed using 2D cross-sectional imaging and 3D inversion Crystalvue/Realisticvue (3D-ICRV) rendering.
Clin Psychopharmacol Neurosci
August 2025
Department of Child and Adolescent Psychiatry, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey.
Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by deficits in social communication and social interaction as well as repetitive behaviors and restricted interests. The genetic mechanism underlying ASD is as complex and heterogeneous as the clinical presentation of the disorder itself. Megalencephaly-capillary malformation syndrome (MCAP) is a rare genetic disorder that is associated with mutations in the ADGRV1 and PIK3CA genes.
View Article and Find Full Text PDFPrenat Diagn
August 2025
Department of Medical Genetics/Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Chengdu, China.
CHD4-associated Sifrim-Hitz-Weiss syndrome (SIHIWES) is an autosomal dominant intellectual developmental disorder. The postnatally clinical manifestations primarily include heart defects, macrocephaly, and hypotonia. We report a well-documented prenatal case of SIHIWES presenting with increased head circumference, polyhydramnios, and widened cerebral subarachnoid spaces.
View Article and Find Full Text PDFbioRxiv
May 2025
Department of Pediatrics, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA.
Biallelic pathogenic variants in , an upstream regulator of the mechanistic target of rapamycin (mTOR) pathway, result in megalencephaly, drug-resistant epilepsy, and severe intellectual disability. This study explores how mTOR pathway hyperactivity alters cell fate specification in dorsal and ventral forebrain development using knock-out human stem cell derived brain organoids. In both dorsal and ventral forebrain knock-out organoids, neurogenesis is delayed, with a predilection for progenitor renewal and proliferation and an increase in outer radial glia.
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