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Efficacy of apheresis in antibody-negative progressive encephalomyelitis with rigidity and myoclonus.
Ther Apher Dial
January 2025
Department of Neurology, Wakayama Medical University, Wakayama, Japan.
Introduction: Progressive encephalomyelitis with rigidity and myoclonus (PERM) is characterized by brainstem symptoms, muscle rigidity, and myoclonus. While autoantibodies to inhibitory neurons have been associated with the pathology, about 30% of cases are negative for autoantibodies. There are few reported cases of antibody-negative PERM and its clinical course and prognosis are unknown.
View Article and Find Full Text PDFImpaired Presynaptic Function Contributes Significantly to the Pathology of Glycine Receptor Autoantibodies.
Neurol Neuroimmunol Neuroinflamm
March 2025
Institute for Clinical Neurobiology, University Hospital, Julius-Maximilians-University of Würzburg, Germany.
Background And Objectives: Autoantibodies (aAbs) against glycine receptors (GlyRs) are mainly associated with the rare neurologic diseases stiff person syndrome (SPS) and progressive encephalomyelitis with rigidity and myoclonus (PERM). GlyR aAbs are also found in other neurologic diseases such as epilepsy. The aAbs bind to different GlyR α-subunits and, more rarely, also to the GlyR β-subunit.
View Article and Find Full Text PDFIntravitreal Enzyme Replacement Therapy Slows Retinopathy in Late Infantile Ceroid Lipofuscinosis Type 2.
Neuropediatrics
January 2025
Department of Inborn Errors of Metabolism, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University Munich, Munich, Germany.
Ceroid lipofuscinosis type 2 (CLN2) is caused by biallelic pathogenic variants in the gene, encoding lysosomal tripeptidyl peptidase 1 (TPP1). The classical late-infantile phenotype has an age of onset between 2 and 4 years and is characterized by psychomotor regression, myoclonus, ataxia, blindness, and shortened life expectancy. Vision loss occurs due to retinal degeneration, usually when severe neurological symptoms are already evident.
View Article and Find Full Text PDFLafora Disease Presenting with Ataxia and DM1: A Case Study.
Acta Neurol Taiwan
December 2024
Zanjan University of Medical Sciences, Zanjan, Iran.
Here we presented a rare case of Lafora disease with neuropathy, ataxia and progression of symptoms into type one DM, GTCS and myoclonus during years. We believe that it is important to keep the diagnosis of Lafora disease in mind in every child presenting with myoclonus especially when mental and cerebellar deficits develop as well. Keywords: Drug-resistant seizure, Ataxia, Myoclonic jerky movements, Lafora.
View Article and Find Full Text PDFSialidosis type 1 in a Turkish family: a case report and review of literatures.
J Pediatr Endocrinol Metab
December 2024
Department of Neurology, Ankara Etlik City Hospital, Ankara, Türkiye.
Objectives: Sialidosis type 1 is a rare autosomal recessive lysosomal storage disorder caused by pathogenic variants in the gene, which encodes the sialic acid-degrading enzyme α-neuraminidase. Sialidosis type 1 is a milder form with a late-onset phenotype, characterized by progressive myoclonic epilepsy and ataxia with cherry-red spots. Sialidosis type 2 is an early-onset and more severe form presenting with dysmorphic features, hepatosplenomegaly and cognitive delay.
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