Genotype and phenotype spectrum of Charcot-Marie-Tooth disease due to mutations in SORD.

Biallelic loss-of-function mutations in the sorbitol dehydrogenase (SORD) gene cause the most common recessive type of Charcot-Marie-Tooth disease (CMT), CMT-SORD. However, the full genotype-phenotype spectrum and progression of the disease remain to be defined. Notably, a multicenter phase 2/3 study to test the efficacy of govorestat (NCT05397665), a new aldose reductase inhibitor, is currently ongoing.

Conformational Antibodies to Proteolipid Protein-1 and Its Peripheral Isoform DM20 in Patients With CNS Autoimmune Demyelinating Disorders.

Background And Objectives: Antibodies to proteolipid protein-1 (PLP1-IgG), a major central myelin protein also expressed in the peripheral nervous system (PNS) as the isoform DM20, have been previously identified mostly in patients with multiple sclerosis (MS), with unclear clinical implications. However, most studies relied on nonconformational immunoassays and included few patients with non-MS CNS autoimmune demyelinating disorders (ADDs). We aimed to investigate conformational PLP1-IgG in the whole ADD spectrum.

Long-Term Follow Up in Anti-Contactin-1 Autoimmune Nodopathy.

Objective: To analyze long-term clinical and biomarker features of anti-contactin-1 (CNTN1) autoimmune nodopathy (AN).

Methods: Patients with anti-CNTN1 autoimmune nodopathy detected in our laboratory from which clinical information was available were included. Clinical features and treatment response were retrospectively collected.

Bilateral Dentate Nuclei Hyperintensities and Response to 4-Aminopyridine in a Patient With Childhood-Onset GAA--Related Ataxia.

Objectives: To report a novel imaging finding of bilateral dentate nuclei hyperintensities in a case of childhood-onset GAA--related ataxia (spinocerebellar ataxia 27B, SCA27B) and response to 4-aminopyridine (4-AP).

Methods: A 53-year-old woman with unsolved progressive cerebellar ataxia of childhood onset underwent clinical and imaging assessment and extensive genetic investigation.

Results: After excluding Friedreich ataxia, most common spinocerebellar ataxia-related expansions, and pathogenic variants in ataxia-related genes through exome sequencing, targeted long-range PCR and repeat-primed PCR analysis revealed a heterozygous pathogenic (GAA) expansion in Brain MRI showed bilateral dentate nuclei hyperintensities and peridentate white matter degeneration, a feature never reported before in SCA27B.