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Modeling sacsin depletion in Danio Rerio offers new insight on retinal defects in ARSACS.
Neurobiol Dis
January 2025
Neurobiology and Molecular Medicine Unit, IRCCS Fondazione Stella Maris, 56128 Pisa, Italy. Electronic address:
Biallelic mutations in the SACS gene, encoding sacsin, cause early-onset autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS), a neurodegenerative disease also characterized by unique and poorly understood retinal abnormalities. While two murine models replicate the phenotypic and neuronal features observed in patients, no retinal phenotype has been described so far. In a zebrafish knock-out strain that faithfully mirrors the main aspects of ARSACS, we observed impaired visual function due to photoreceptor degeneration, likely caused by cell cycle defects in progenitor cells.
View Article and Find Full Text PDFAutosomal-recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is an early-onset neurodegenerative disease caused by mutations in the SACS gene. The first two mutations were identified in French Canadian populations 20 years ago. The disease is now known as one of the most frequent recessive ataxias worldwide.
View Article and Find Full Text PDFEEFSEC deficiency: A selenopathy with early-onset neurodegeneration.
Am J Hum Genet
January 2025
Institute of Medical Genetics and Applied Genomics, University of Tübingen, 72076 Tübingen, Germany; Center for Rare Disease, University of Tübingen, 72076 Tübingen, Germany; Genomics for Health in Africa (GHA), Africa-Europe Cluster of Research Excellence (CoRE).
Inborn errors of selenoprotein expression arise from deleterious variants in genes encoding selenoproteins or selenoprotein biosynthetic factors, some of which are associated with neurodegenerative disorders. This study shows that bi-allelic selenocysteine tRNA-specific eukaryotic elongation factor (EEFSEC) variants cause selenoprotein deficiency, leading to progressive neurodegeneration. EEFSEC deficiency, an autosomal recessive disorder, manifests with global developmental delay, progressive spasticity, ataxia, and seizures.
View Article and Find Full Text PDF[A case of rare hereditary Siddiqi syndrome with novel neuropsychiatric signs].
Zh Nevrol Psikhiatr Im S S Korsakova
December 2024
Bochkov Research Centre for Medical Genetics, Moscow, Russia.
A fifth world case of autosomal recessive Siddiqi syndrome (SIDDIS) related to ene is presented. In a consanguineous Lezgin (a Dagestan ethnicity) family, there were two affected brothers aged 28 yrs (proband, personally examined) and 32 yrs. Whole-exome sequencing followed by familial Sanger sequencing detected a novel missence variant c.
View Article and Find Full Text PDFTorticollis as an early manifestation of basilar invagination in a paediatric patient.
BMJ Case Rep
December 2024
McMaster Children's Hospital/ Hamilton Health Sciences, Hamilton, Ontario, Canada.
This case report describes the clinical journey of a male patient in early childhood with developmental delay, failure to thrive, worsening right-sided head tilt torticollis and regression of motor skills with spasticity of the lower limbs. The case was complex due to the early onset and gradually worsening symptoms, including a decline in established motor milestones. Genetic testing to investigate the delayed neurodevelopment revealed a variant that did not fully explain the patient's phenotype.
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