Usher syndrome (USH) is a clinically heterogeneous condition characterized by sensorineural hearing loss, progressive retinal degeneration, and vestibular dysfunction. A minimum test battery is described as well as additional clinical evaluations that would provide comprehensive testing of hearing, vestibular function, and visual function in USH patients. USH is also genetically heterogeneous. At least nine genes have been identified with mutations that can cause USH. The proteins encoded by these genes are thought to interact with one another to form a network in the sensory cells of the inner ear and retina.
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Actigraphy-based assessment of circadian rhythmicity and sleep in patients with Usher syndrome type 2a: A case-control study.
J Sleep Res
December 2024
Department of Otorhinolaryngology, Radboud University Medical Center, Nijmegen, The Netherlands.
This study aimed to improve our understanding of sleep problems as a comorbidity of hereditary deaf-blindness due to Usher syndrome type 2a. Fifteen patients with Usher syndrome type 2a with a conclusive genetic diagnosis and 15 unaffected controls participated in comprehensive sleep and activity assessments for 2 weeks, using the MotionWatch 8 actigraph and consensus sleep diary. Various sleep parameters including sleep opportunity window, sleep latency, sleep efficiency, and self-reported sleep quality were analysed.
View Article and Find Full Text PDFSyndromic Retinitis Pigmentosa.
Prog Retin Eye Res
December 2024
Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands; Department of Ophthalmology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
Retinitis pigmentosa (RP) is a progressive inherited retinal dystrophy, characterized by the degeneration of photoreceptors, presenting as a rod-cone dystrophy. Approximately 20-30% of patients with RP also exhibit extra-ocular manifestations in the context of a syndrome. This manuscript discusses the broad spectrum of syndromes associated with RP, pathogenic mechanisms, clinical manifestations, differential diagnoses, clinical management approaches, and future perspectives.
View Article and Find Full Text PDFVariants in the AGBL5 gene are responsible for autosomal recessive Retinitis pigmentosa with hearing loss.
Eur J Hum Genet
December 2024
Molecular, Cellular, and Genomic Biomedicine Group, IIS-La Fe, Valencia, Spain.
The AGBL5 gene encodes for the Cytoplasmic Carboxypeptidase 5 (CCP5), an α-tubulin deglutamylase that cleaves the γ-carboxyl-linked branching point of glutamylated tubulin. To date, pathogenic variants in AGBL5 have been associated only with isolated retinitis pigmentosa (RP). Hearing loss has not been reported in AGBL5-caused retinal disease.
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Dev Med Child Neurol
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Edinburgh Clinical Trials Unit, Usher Institute, University of Edinburgh, Edinburgh, UK.
Aim: To extend the findings of a previous clinical trial suggesting combined abacavir (ABC), lamivudine (3TC), and zidovudine (AZT) reduces type I interferon (IFN) signalling in Aicardi-Goutières syndrome (AGS).
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Exploring non-coding variants and evaluation of antisense oligonucleotides for splicing redirection in Usher syndrome.
Mol Ther Nucleic Acids
December 2024
Molecular, Cellular and Genomics Biomedicine, Health Research Institute La Fe, 46026 Valencia, Spain.
Exploring non-coding regions is increasingly gaining importance in the diagnosis of inherited retinal dystrophies. Deep-intronic variants causing aberrant splicing have been identified, prompting the development of antisense oligonucleotides (ASOs) to modulate splicing. We performed a screening of five previously described deep-intronic variants among monoallelic patients with Usher syndrome (USH) or isolated retinitis pigmentosa.
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